[Title 40 CFR ]
[Code of Federal Regulations (annual edition) - July 1, 2010 Edition]
[From the U.S. Government Printing Office]
[[Page 1]]
40
Parts 136 to 149
Revised as of July 1, 2010
Protection of Environment
________________________
Containing a codification of documents of general
applicability and future effect
As of July 1, 2010
With Ancillaries
Published by
Office of the Federal Register
National Archives and Records
Administration
A Special Edition of the Federal Register
[[Page ii]]
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[[Page iii]]
Table of Contents
Page
Explanation................................................. v
Title 40:
Chapter I--Environmental Protection Agency
(Continued) 3
Finding Aids:
Table of CFR Titles and Chapters........................ 931
Alphabetical List of Agencies Appearing in the CFR...... 951
List of CFR Sections Affected........................... 961
[[Page iv]]
----------------------------
Cite this Code: CFR
To cite the regulations in
this volume use title,
part and section number.
Thus, 40 CFR 136.1 refers
to title 40, part 136,
section 1.
----------------------------
[[Page v]]
EXPLANATION
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[[Page vi]]
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[[Page vii]]
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July 1, 2010.
[[Page ix]]
THIS TITLE
Title 40--Protection of Environment is composed of thirty-two
volumes. The parts in these volumes are arranged in the following order:
parts 1-49, parts 50-51, part 52 (52.01-52.1018), part 52 (52.1019-end
of part 52), parts 53-59, part 60 (60.1-end of part 60, sections), part
60 (Appendices), parts 61-62, part 63 (63.1-63.599), part 63 (63.600-
63.1199), part 63 (63.1200-63.1439), part 63 (63.1440-63.6175), part 63
(63.6580-63.8830), part 63 (63.8980-end of part 63) parts 64-71, parts
72-80, parts 81-84, part 85-Sec. 86.599-99, part 86 (86.600-1-end of
part 86), parts 87-99, parts 100-135, parts 136-149, parts 150-189,
parts 190-259, parts 260-265, parts 266-299, parts 300-399, parts 400-
424, parts 425-699, parts 700-789, parts 790-999, and part 1000 to end.
The contents of these volumes represent all current regulations codified
under this title of the CFR as of July 1, 2010.
Chapter I--Environmental Protection Agency appears in all thirty-two
volumes. Regulations issued by the Council on Environmental Quality,
including an Index to Parts 1500 through 1508, appear in the volume
containing part 1000 to end. The OMB control numbers for title 40 appear
in Sec. 9.1 of this chapter.
For this volume, Cheryl E. Sirofchuck, was Chief Editor. The Code of
Federal Regulations publication program is under the direction of
Michael L. White, assisted by Ann Worley.
[[Page 1]]
TITLE 40--PROTECTION OF ENVIRONMENT
(This book contains parts 136 to 149)
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Part
chapter i--Environmental Protection Agency (Continued)...... 136
[[Page 3]]
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
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Editorial Note: Nomenclature changes to chapter I appear at 65 FR
47324, 47325, Aug. 2, 2000, and at 66 FR 34375, 34376, June 28, 2001.
SUBCHAPTER D--WATER PROGRAMS (CONTINUED)
Part Page
136 Guidelines establishing test procedures for
the analysis of pollutants.............. 5
140 Marine sanitation device standard........... 363
141 National primary drinking water regulations. 367
142 National primary drinking water regulations
implementation.......................... 639
143 National secondary drinking water
regulations............................. 697
144 Underground injection control program....... 702
145 State UIC program requirements.............. 768
146 Underground injection control program:
Criteria and standards.................. 781
147 State, tribal, and EPA-administered
underground injection control programs.. 813
148 Hazardous waste injection restrictions...... 915
149 Sole source aquifers........................ 924
[[Page 5]]
SUBCHAPTER D_WATER PROGRAMS (CONTINUED)
PART 136_GUIDELINES ESTABLISHING TEST PROCEDURES FOR THE ANALYSIS OF POLLUTANTS--Table of Contents
Sec.
136.1 Applicability.
136.2 Definitions.
136.3 Identification of test procedures.
136.4 Application for alternate test procedures.
136.5 Approval of alternate test procedures.
136.6 Method modifications and analytical requirements.
Appendix A to Part 136--Methods for Organic Chemical Analysis of
Municipal and Industrial Wastewater
Appendix B to Part 136--Definition and Procedure for the Determination
of the Method Detection Limit--Revision 1.11
Appendix C to Part 136--Inductively Coupled Plasma--Atomic Emission
Spectrometric Method for Trace Element Analysis of Water and
Wastes Method 200.7
Appendix D to Part 136--Precision and Recovery Statements for Methods
for Measuring Metals
Authority: Secs. 301, 304(h), 307 and 501(a), Pub. L. 95-217, 91
Stat. 1566, et seq. (33 U.S.C. 1251, et seq.) (the Federal Water
Pollution Control Act Amendments of 1972 as amended by the Clean Water
Act of 1977).
Sec. 136.1 Applicability.
(a) The procedures prescribed herein shall, except as noted in Sec.
136.5, be used to perform the measurements indicated whenever the waste
constituent specified is required to be measured for:
(1) An application submitted to the Administrator, or to a State
having an approved NPDES program for a permit under section 402 of the
Clean Water Act of 1977, as amended (CWA), and/or to reports required to
be submitted under NPDES permits or other requests for quantitative or
qualitative effluent data under parts 122 to 125 of title 40, and,
(2) Reports required to be submitted by dischargers under the NPDES
established by parts 124 and 125 of this chapter, and,
(3) Certifications issued by States pursuant to section 401 of the
CWA, as amended.
(b) The procedure prescribed herein and in part 503 of title 40
shall be used to perform the measurements required for an application
submitted to the Administrator or to a State for a sewage sludge permit
under section 405(f) of the Clean Water Act and for recordkeeping and
reporting requirements under part 503 of title 40.
[72 FR 14224, Mar. 26, 2007]
Sec. 136.2 Definitions.
As used in this part, the term:
(a) Act means the Clean Water Act of 1977, Pub. L. 95-217, 91 Stat.
1566, et seq. (33 U.S.C. 1251 et seq.) (The Federal Water Pollution
Control Act Amendments of 1972 as amended by the Clean Water Act of
1977).
(b) Administrator means the Administrator of the U.S. Environmental
Protection Agency.
(c) Regional Administrator means one of the EPA Regional
Administrators.
(d) Director means the Director of the State Agency authorized to
carry out an approved National Pollutant Discharge Elimination System
Program under section 402 of the Act.
(e) National Pollutant Discharge Elimination System (NPDES) means
the national system for the issuance of permits under section 402 of the
Act and includes any State or interstate program which has been approved
by the Administrator, in whole or in part, pursuant to section 402 of
the Act.
(f) Detection limit means the minimum concentration of an analyte
(substance) that can be measured and reported with a 99% confidence that
the analyte concentration is greater than zero as determined by the
procedure set forth at appendix B of this part.
[38 FR 28758, Oct. 16, 1973, as amended at 49 FR 43250, Oct. 26, 1984]
Sec. 136.3 Identification of test procedures.
(a) Parameters or pollutants, for which methods are approved, are
listed together with test procedure descriptions and references in
Tables IA, IB, IC, ID, IE, IF, IG, and IH. In the event
[[Page 6]]
of a conflict between the reporting requirements of 40 CFR Parts 122 and
125 and any reporting requirements associated with the methods listed in
these tables, the provisions of 40 CFR Parts 122 and 125 are controlling
and will determine a permittee's reporting requirements. The full text
of the referenced test procedures are incorporated by reference into
Tables IA, IB, IC, ID, IE, IF, IG, and IH. The incorporation by
reference of these documents, as specified in paragraph (b) of this
section, was approved by the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the
documents may be obtained from the sources listed in paragraph (b) of
this section. Documents may be inspected at EPA's Water Docket, EPA
West, 1301 Constitution Avenue, NW., Room B102, Washington, DC
(Telephone: 202-566-2426); or at the National Archives and Records
Administration (NARA). For information on the availability of this
material at NARA, call 202-741-6030, or go to: http://www.archives.gov/
federal--register/code--of--federal--regulations/ibr--locations.html.
These test procedures are incorporated as they exist on the day of
approval and a notice of any change in these test procedures will be
published in the Federal Register. The discharge parameter values for
which reports are required must be determined by one of the standard
analytical test procedures incorporated by reference and described in
Tables IA, IB, IC, ID, IE, IF, IG, and IH or by any alternate test
procedure which has been approved by the Administrator under the
provisions of paragraph (d) of this section and Sec. Sec. 136.4 and
136.5. Under certain circumstances paragraph (c) of this section, Sec.
136.5(a) through (d) or 40 CFR 401.13, other additional or alternate
test procedures may be used.
[[Page 7]]
Table IA--List of Approved Biological Methods for Wastewater and Sewage Sludge
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Standard methods
Parameter and units Method \1\ EPA 18th, 19th, 20th Standard methods AOAC, ASTM, USGS Other
ed. online
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Bacteria:
1. Coliform (fecal), number Most Probable p. 132 \3\........ 9221 C E.......... 9221 C E-99.......
per 100 mL or number per Number (MPN),\5\ 1680 \12,14\......
gram dry weight. tube 3 dilution, 1681 \12,19\......
or
Membrane filter p. 124 \3\........ 9222 D............ 9222 D-97......... B-0050-85 \5\.....
(MF) \2\, single
step.
2. Coliform (fecal) in MPN, 5 tube, 3 p. 132 \3\........ 9221 C E.......... 9221 C E-99.......
presence of chlorine, dilution, or
number per 100 mL.
MF \2\, single p. 124 \3\........ 9222 D............ 9222 D-97.........
step.
3. Coliform (total), number MPN, 5 tube, 3 p. 114 \3\........ 9221 B............ 9221 B-99.........
per 100 mL. dilution, or
MF \2\, single p. 108 \3\........ 9222 B............ 9222 B-97......... B-0025-8 \5\......
step or two step.
4. Coliform (total), in MPN, 5 tube, 3 p. 114 \3\........ 9221 B............ 9221 B-99.........
presence of chlorine, dilution, or
number per 100 mL.
MF \2\ with p. 111 \3\........ 9222 (B+B.5c)..... 9222 (B+B.5c)-97..
enrichment.
5. E. coli, number per 100 MPN \7,9,15\ .................. 9223 B \13\....... 9223 B-97 \13\.... 991.15 \11\....... Colilert[reg]\13,1
mL \20\. multiple tube/ 7\
multiple well. Colilert-
18[reg]\13,16,17\
MF \2,6,7,8,9\ 1603 \21\......... .................. .................. .................. mColiBlue-
single step. 24[reg]\18\
6. Fecal streptococci, MPN, 5 tube 3 p. 139 \3\........ 9230 B............ 9230 B-93.........
number per 100 mL. dilution,.
MF \2\, or........ p. 136 \3\........ 9230 C............ 9230 C-93......... B-0055-85 \5\.....
Plate count....... p. 143 \3\........
7. Enterococci, number per MPN \7,9\, .................. .................. .................. D6503-99 \10\..... Enterolert[reg]
100 mL \20\. multiple tube/ \13,23\
multiple well.
MF \2,6,7,8,9\ 1600 \24\.........
single step.
8. Salmonella, number per MPN multiple tube. 1682 \22\.........
gram dry weight \12\.
Aquatic Toxicity:
9. Toxicity, acute, fresh Ceriodaphnia dubia 2002.0 \25\.......
water organisms, LC 50, acute.
percent effluent.
Daphnia puplex and 2021.0 \25\.......
Daphnia magna
acute.
Fathead Minnow, 2000.0 \25\.......
Pimephales
promelas, and
Bannerfin shiner,
Cyprinella
leedsi, acute.
Rainbow Trout, 2019.0 \25\.......
Oncorhynchus
mykiss, and brook
trout, Salvelinus
fontinalis, acute.
[[Page 8]]
10. Toxicity, acute, Mysid, Mysidopsis 2007.0 \25\.......
estuarine and marine bahia, acute.
organisms of the Atlantic
Ocean and Gulf of Mexico,
LC50, percent effluent.
Sheepshead Minnow, 2004.0 \25\.......
Cyprinodon
variegatus, acute.
Silverside, 2006.0 \25\.......
Menidia
beryllina,
Menidia menidia,
and Menidia
peninsulae, acute.
11. Toxicity, chronic, fresh Fathead minnow, 1000.0 \26\.......
water organisms, NOEC or Pimephales
IC25, percent effluent. promelas, larval
survival and
growth.
Fathead minnow, 1001.0 \26\.......
Pimephales
promelas, embryo-
larval survival
and
teratogenicity.
Daphnia, 1002.0 \26\.......
Ceriodaphnia
dubia, survival
and reproduction.
Green alga, 1003.0 \26\.......
Selenastrum
capricornutum,
growth.
12. Toxicity, chronic, Sheepshead minnow, 1004.0 \27\.......
estuarine and marine Cyprinodon
organisms of the Atlantic variegatus,
Ocean and Gulf of Mexico, larval survival
NOEC or IC25, percent and growth.
effluent.
Sheepshed minnow, 1005.0 \27\.......
Cyprinodon
variegatus,
embryo-larval
survival and
teratogenicity.
Inland silverside, 1006.0 \27\.......
Menidia
beryllina, larval
survival and
growth.
Mysid, Mysidopsis 1007.0 \27\.......
bahia, survival,
growth, and
fecundity.
Sea urchin, 1008.0 \27\.......
Arbacia
punctulata,
fertilization.
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\1\ The method must be specified when results are reported.
\2\ A 0.45 [mu]m membrane filter (MF) or other pore size certified by the manufacturer to fully retain organisms to be cultivated and to be free of
extractables which could interfere with their growth.
\3\ USEPA. 1978. Microbiological Methods for Monitoring the Environment, Water, and Wastes. Environmental Monitoring and Support Laboratory, U.S.
Environmental Protection Agency, Cincinnati, OH, EPA/600/8-78/017.
\4\ [Reserved]
[[Page 9]]
\5\ USGS. 1989. U.S. Geological Survey Techniques of Water-Resource Investigations, Book 5, Laboratory Analysis, Chapter A4, Methods for Collection and
Analysis of Aquatic Biological and Microbiological Samples, U.S. Geological Survey, U.S. Department of the Interior, Reston, VA.
\6\ Because the MF technique usually yields low and variable recovery from chlorinated wastewaters, the Most Probable Number method will be required to
resolve any controversies.
\7\ Tests must be conducted to provide organism enumeration (density). Select the appropriate configuration of tubes/filtrations and dilutions/volumes
to account for the quality, character, consistency, and anticipated organism density of the water sample.
\8\ When the MF method has been used previously to test waters with high turbidity, large numbers of noncoliform bacteria, or samples that may contain
organisms stressed by chlorine, a parallel test should be conducted with a multiple-tube technique to demonstrate applicability and comparability of
results.
\9\ To assess the comparability of results obtained with individual methods, it is suggested that side-by-side tests be conducted across seasons of the
year with the water samples routinely tested in accordance with the most current Standard Methods for the Examination of Water and Wastewater or EPA
alternate test procedure (ATP) guidelines.
\10\ ASTM. 2000, 1999, 1996. Annual Book of ASTM Standards--Water and Environmental Technology. Section 11.02. ASTM International. 100 Barr Harbor
Drive, West Conshohocken, PA 19428.
\11\ AOAC. 1995. Official Methods of Analysis of AOAC International, 16th Edition, Volume I, Chapter 17. Association of Official Analytical Chemists
International. 481 North Frederick Avenue, Suite 500, Gaithersburg, MD 20877-2417.
\12\ Recommended for enumeration of target organism in sewage sludge.
\13\ These tests are collectively known as defined enzyme substrate tests, where, for example, a substrate is used to detect the enzyme [beta]-
glucuronidase produced by E. coli.
\14\ USEPA. July 2006. Method 1680: Fecal Coliforms in Sewage Sludge (Biosolids) by Multiple-Tube Fermentation Using Lauryl-Tryptose Broth (LTB) and EC
Medium. US Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-012.
\15\ Samples shall be enumerated by the multiple-tube or multiple-well procedure. Using multiple-tube procedures, employ an appropriate tube and
dilution configuration of the sample as needed and report the Most Probable Number (MPN). Samples tested with Colilert[reg] may be enumerated with the
multiple-well procedures, Quanti-Tray[reg] Quanti-Tray[reg] 2000, and the MPN calculated from the table provided by the manufacturer.
\16\ Colilert-18[reg] is an optimized formulation of the Colilert[reg] for the determination of total coliforms and E. coli that provides results within
18 h of incubation at 35 [deg]C rather than the 24 h required for the Colilert[reg] test and is recommended for marine water samples.
\17\ Descriptions of the Colilert[reg], Colilert-18[reg], Quanti-Tray[reg], and Quanti-Tray[reg]/2000 may be obtained from IDEXX Laboratories, Inc., 1
IDEXX Drive, Westbrook, ME 04092.
\18\ A description of the mColiBlue24[reg] test, Total Coliforms and E. coli, is available from Hach Company, 100 Dayton Ave., Ames, IA 50010.
\19\ USEPA. July 2006. Method 1681: Fecal Coliforms in Sewage Sludge (Biosolids) by Multiple-Tube Fermentation using A-1 Medium. U.S. Environmental
Protection Agency, Office of Water, Washington, DC EPA-821-R-06-013.
\20\ Recommended for enumeration of target organism in wastewater effluent.
\21\ USEPA. July 2006. Method 1603: Escherichia coli (E. coli) in Water by Membrane Filtration Using Modified membrane-Thermotolerant Escherichia coli
Agar (modified mTEC). U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-011.
\22\ USEPA. July 2006. Method 1682: Salmonella in Sewage Sludge (Biosolids) by Modified Semisolid Rappaport-Vassiliadis (MSRV) Medium. U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-014.
\23\ A description of the Enterolert[reg] test may be obtained from IDEXX Laboratories, Inc., 1 IDEXX Drive, Westbrook, ME 04092.
\24\ USEPA. July 2006. Method 1600: Enterococci in Water by Membrane Filtration Using membrane-Enterococcus Indoxyl-[beta]-D-Glucoside Agar (mEI). U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-009.
\25\ USEPA. October 2002. Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms. Fifth Edition.
U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA/821/R-02/012.
\26\ USEPA. October 2002. Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth
Edition, U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA/821/R-02/013.
\27\ USEPA. October 2002. Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms.
Third Edition. U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA/821/R-02/014.
Table IB--List of Approved Inorganic Test Procedures
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Reference (method number or page)
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Parameter Methodology \58\ Standard methods Standard methods Standard methods
EPA \35,\ \52\ (18th, 19th) (20th) online ASTM USGS/AOAC/other
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1. Acidity, as CaCO3, mg/L....... Electrometric ..................... 2310 B(4a)........... 2310 B(4a)........... 2310 B(4a)-97......... D1067-92, 02........ I-1020-85 \2\
endpoint or
phenolphthalein
endpoint.
[[Page 10]]
2. Alkalinity, as CaCO3, mg/L.... Electrometric or ..................... 2320 B............... 2320 B............... 2320 B-97............. D1067-92, 02........ 973.43 \3\, I-1030-
Colorimetric 85 \2\
titration to pH
4.5, manual, or
automatic........... 310.2 (Rev. 1974) \1\ ..................... ..................... ...................... .................... I-2030-85 \2\
3. Aluminum--Total,\4\ mg/L...... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99............. .................... I-3051-85 \2\
\36\.
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99.............
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-9750
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14\3\
(1994).
Direct Current ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Plasma (DCP) \36\.
Colorimetric ..................... 3500-Al D............ 3500-Al B............ 3500-Al B-01..........
(Eriochrome cyanine
R).
4. Ammonia (as N), mg/L.......... Manual, distillation 350.1, Rev. 2.0 4500-NH B3........... 4500-NH3 B........... 4500-NH3 B-97......... .................... 973.49 \3\
(at pH 9.5) \6\ (1993).
followed by:
Nesslerization...... ..................... 4500-NH3 C (18th ..................... ...................... D1426-98, 03 (A).... 973.49 \3\, I-3520-
only). 85 \2\
Titration........... ..................... 4500-NH3 C (19th) and 4500-NH3 C........... 4500-NH3 C-97.........
4500-NH3 E (18th).
Electrode........... ..................... 4500-NH3 D or E 4500-NH3 D or E...... 4500-NH3 D or E-97.... D1426-98, 03 (B)....
(19th) and 4500-NH3
F or G (18th).
[[Page 11]]
Automated phenate, 350.1 \60\, Rev. 2.0 4500-NH3 G (19th) and 4500-NH3 G........... 4500-NH3 G-97......... .................... I-4523-85 \2\
or. (1993). 4500-NH3 H (18th).
Automated electrode. ..................... ..................... ..................... ...................... .................... See footnote 7
Ion Chromatography.. ..................... ..................... ..................... ...................... D6919-03............
5. Antimony--Total, \4\ mg/L..... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99.............
\36\.
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99.............
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
6. Arsenic--Total, \4\ mg/L...... Digestion \4\ 206.5 (Issued 1978)
followed by. \1\.
AA gaseous hydride.. ..................... 3114 B 4.d........... ..................... 3114 B 4.d-97......... D2972-97, 03 (B).... I-3062-85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D2972-97, 03 (C).... I-4063-98 \49\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
Colorimetric (SDDC). ..................... 3500-As C............ 3500-As B............ 3500-As B-97.......... D2972-97, 03 (A).... I-3060-85
7. Barium--Total,\4\ mg/L........ Digestion \4\
followed by:
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99............. .................... I-3084-85 \2\
\36\.
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D4382-95, 02........
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP \36\............ ..................... ..................... ..................... ...................... .................... See footnote \34\
8. Beryllium--Total,\4\ mg/L..... Digestion \4\
followed by:
[[Page 12]]
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99............. D3645-93 (88), 03 I-3095-85 \2\
(A).
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D3645-93 (88), 03
(B).
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP, or............. ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Be D............
(aluminon).
9. Biochemical oxygen demand Dissolved Oxygen ..................... 5210 B............... 5210 B............... 5210 B-01............. .................... 973.44,\3\ p.
(BOD5), mg/L. Depletion. 17.\9\, I-1578-78
\8\
10. Boron--Total,\37\ mg/L....... Colorimetric ..................... 4500-B B............. 4500-B B............. 4500-B B-00........... .................... I-3112-85 \2\
(curcumin).
ICP/AES, or......... 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B 99............. .................... I-4471-97 \50\
(1994).
DCP................. ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote 34
11. Bromide, mg/L................ Titrimetric......... ..................... ..................... ..................... ...................... D1246-95, 99 (C).... p. S44.\10\
.................... ..................... ..................... ..................... ...................... .................... I-1125-85 \2\
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
12. Cadmium--Total,\4\ mg/L...... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D3557-95, 02 (A or 974.27,\3\ p.
\36\. B). 37.\9\, I-3135-85
\2\ or I-3136-85
\2\
[[Page 13]]
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D3557-95, 02 (D).... I-4138-89 \51\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-1472-85\2\ or I-
(1994). 4471-97 \50\
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP \36\............ ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Voltametry \11\, or. ..................... ..................... ..................... ...................... D3557-95, 02 (C)....
Colorimetric ..................... 3500-Cd D............
(Dithizone).
13. Calcium--Total,\4\ mg/L...... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. D511-93, 03(B)...... I-3152-85 \2\
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
DCP, or............. ..................... ..................... ..................... ...................... .................... See footnote \34\
Titrimetric (EDTA).. ..................... 3500-Ca D............ 3500-Ca B............ 3500-Ca B-97.......... D511-93, 03(A)......
Ion Chromatography.. ..................... ..................... ..................... ...................... D6919-03............
14. Carbonaceous biochemical Dissolved Oxygen ..................... 5210 B............... 5210 B............... 5210 B-01.............
oxygen demand (CBOD5), mg/L \12\. Depletion with
nitrification
inhibitor.
15. Chemical oxygen demand (COD), Titrimetric......... 410.3 (Rev. 1978) \1\ 5220 C............... 5220 C............... 5220 C-97............. D1252-95, 00 (A).... 973.46 \3\, p. 17
mg/L. \9\ I-3560-85 \2\
Spectrophotometric, 410.4, Rev. 2.0 5220 D............... 5220 D............... 5220 D-97............. D1252-95, 00 (B).... See footnotes
manual or automatic. (1993). \13,14\. I-3561-85
\2\
16. Chloride, mg/L............... Titrimetric: (silver ..................... 4500-Cl-B............ 4500-Cl-B............ 4500-Cl-B-97.......... D512-89(99) (B)..... I-1183-85 \2\
nitrate) or.
(Mercuric nitrate).. ..................... 4500-Cl-C............ 4500-Cl-C............ 4500-Cl-C-97.......... D512-89 (99) (A).... 973.51 \3\, I-1184-
85 \2\
Colorimetric: manual ..................... ..................... ..................... ...................... .................... I-1187-85 \2\
or.
Automated ..................... 4500-Cl-E............ 4500-Cl-E............ 4500-Cl-E-97.......... .................... I-2187-85 \2\
(Ferricyanide).
Potentiometric ..................... 4500-Cl-D............ 4500-Cl-D............ 4500-Cl-D-97..........
Titration.
Ion Selective ..................... ..................... ..................... ...................... D512-89(99)(C)......
Electrode.
[[Page 14]]
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
17. Chlorine--Total residual, mg/ Amperometric direct, ..................... 4500-Cl D............ 4500-Cl D............ 4500-Cl D-00.......... D1253-86 (96), 03...
L; Titrimetric. or.
Amperometric direct ..................... 4500-Cl E............ 4500-Cl E............ 4500-Cl E-00..........
(low level).
Iodometric direct... ..................... 4500-Cl B............ 4500-Cl B............ 4500-Cl B-00..........
Back titration ether ..................... 4500-Cl C............ 4500-Cl C............ 4500-Cl C-00..........
end-point \15\ or.
DPD-FAS............. ..................... 4500-Cl F............ 4500-Cl F............ 4500-Cl F-00..........
Spectrophotometric, ..................... 4500-Cl G............ 4500-Cl G............ 4500-Cl G-00..........
DPD or.
Electrode........... ..................... ..................... ..................... ...................... .................... See footnote \16\
18. Chromium VI dissolved, mg/L.. 0.45-micron
Filtration followed
by:
AA chelation- ..................... 3111 C............... ..................... 3111 C-99............. .................... I-1232-85
extraction or.
Ion Chromatography.. 218.6, Rev. 3.3 3500-Cr E............ 3500-Cr C............ 3500-Cr C-01.......... D5257-97............ 993.23
(1994).
Colorimetric ..................... 3500-Cr D............ 3500-Cr B............ 3500-Cr B-01.......... D1687-92, 02 (A).... I-1230-85
(Diphenyl-
carbazide).
19. Chromium--Total,\4\ mg/L..... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. D1687-92, 02 (B).... 974.27 \3\, I-3236-
\36\. 85 \2\
AA chelation- ..................... 3111 C............... ..................... 3111 C-99.............
extraction.
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D1687-92, 02 (C).... I-3233-93 \46\
STGFAA.............. 200.9, Rev. 2.2
(1994).
[[Page 15]]
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP,\36\ or......... ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Cr D............ 3500-Cr B............ 3500-Cr B-01..........
(Diphenyl-
carbazide).
20. Cobalt--Total,\4\ mg/L....... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D3558-94, 03 (A or p. 37 \9\, I-3239-85
B). \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D3558-94, 03 (C).... I-4243-89 \51\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP................. ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
21. Color, platinum cobalt units Colorimetric (ADMI), ..................... 2120 E............... 2120 E............... ...................... .................... See footnote \18\
or dominant wavelength, hue, or.
luminance purity.
(Platinum cobalt), ..................... 2120 B............... 2120 B............... 2120 B-01............. .................... I-1250-85 \2\
or.
Spectrophotometric.. ..................... 2120 C............... 2120 C...............
22. Copper--Total,\4\ mg/L....... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D1688-95, 02 (A or 974.27 \3\ p. 37 \9\
\36\. B). I-3270-85 \2\ or I-
3271-85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D1688-95, 02 (C).... I-4274-89 \51\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP \36\ or......... ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Cu D............ 3500-Cu B............ 3500-Cu B-99..........
(Neocuproine) or.
(Bicinchoninate).... ..................... 3500-Cu E............ 3500-Cu C............ 3500-Cu C-99.......... .................... See footnote \19\
[[Page 16]]
23. Cyanide--Total, mg/L......... Automated ..................... ..................... ..................... ...................... .................... Kelada-01 \55\
Distillation and
Colorimetry, or.
Manual distillation 335.4, Rev. 1.0 4500-CN C............ 4500-CN C............ ...................... D2036-98(A)......... 10-204-00-1-X \56\
with MgCl2 followed (1993) \57\.
by:
Titrimetric or...... ..................... 4500-CN D............ 4500-CN D............ 4500-CN D-99.......... .................... p. 22 \9\
Spectrophotometric, ..................... 4500-CN E............ 4500-CN E............ 4500-CN E-99.......... D2036-98(A)......... I-3300-85
manual or.
Automated \20\ or... 335.4, Rev. 1.0 ..................... ..................... ...................... .................... 10-204-00-1-X \56\,
(1993) \57\. I-4302-85 \2\
Ion Selective ..................... 4500-CN F............ 4500-CN F............ 4500-CN F-99.......... D2036-98(A).........
Electrode.
24. Available Cyanide, mg/L...... Cyanide Amenable to ..................... 4500-CN G............ 4500-CN G............ 4500-CN G-99.......... D2036-98(B).........
Chlorination
(CATC); Manual
distillation with
MgCl2 followed by
Titrimetric or
Spectrophotometric.
Flow injection and ..................... ..................... ..................... ...................... D6888-04............ OIA-1677 \44\
ligand exchange,
followed by
amperometry \61\.
Automated ..................... ..................... ..................... ...................... .................... Kelada-01 \55\
Distillation and
Colorimetry.
25. Fluoride--Total, mg/L........ Manual ..................... 4500-F B............. 4500-F B............. 4500-F B-97...........
distillation\6\
followed by:
Electrode, manual or ..................... 4500-F B............. 4500-F B............. 4500-F C-97........... D1179-93, 99 (B)....
Automated........... ..................... ..................... ..................... ...................... .................... I-4327-85 \2\
Colorimetric, ..................... 4500-F D............. 4500-F D............. 4500-F D-97........... D1179-93, 99 (A)....
(SPADNS) or.
[[Page 17]]
Automated complexone ..................... 4500-F E............. 4500-F E............. 4500-F E-97...........
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97,03......... 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
26. Gold--Total,\4\ mg/L......... Digestion \4\
followed by:
AA direct ..................... 3111 B............... ..................... 3111 B-99.............
aspiration, or.
AA furnace, or...... 231.2 (Rev. 1978) \1\
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
27. Hardness--Total, as CaCO3, mg/ Automated 130.1 (Issued 1971)
L. colorimetric,. \1\.
Titrimetric (EDTA) ..................... 2340 B or C.......... 2340 B or C.......... 2340 B or C-97........ D1126-86(92), 02.... 973.5 2B \3\, I-1338-
or. 85\2\
Ca plus Mg as their
carbonates, by
inductively coupled
plasma or AA direct
aspiration. (See
Parameters 13 and
33)..
28. Hydrogen ion (pH), pH units.. Electrometric ..................... 4500-H+ B............ 4500-H+ B............ 4500-H+ B-00.......... D1293-84 (90), 99 (A 973.41.\3\, I-1586-
measurement or. or B). 85 \2\
Automated electrode. 150.2 (Dec. 1982) \1\ ..................... ..................... ...................... .................... See footnote\21\, I-
2587-85\2\
29. Iridium--Total,\4\ mg/L...... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99.............
or.
AA furnace.......... 235.2 (Issued 1978)
\1\.
30. Iron--Total,\4\ mg/L......... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D1068-96, 03 (A or 974.27 \3\, I-3381-
\36\. B). 85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D1068-96, 03 (C)....
STGFAA.............. 200.9, Rev. 2.2
(1994).
[[Page 18]]
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
DCP \36\ or......... ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Fe D............ 3500-Fe B............ 3500-Fe B-97.......... D1068-96, 03 (D).... See footnote \22\
(Phenanthroline).
31. Kjeldahl Nitrogen \5\--Total, Digestion and ..................... 4500-Norg B or C and 4500-Norg B or C and 4500-Norg B or C-97 D3590-89, 02 (A)....
(as N), mg/L. distillation 4500-NH3 B. 4500-NH3 B. and 4500-NH3 B-97.
followed by: \20\
Titration or........ ..................... 4500-NH3 C (19th) and 4500-NH3 C........... 4500-NH3 C-97......... D3590-89, 02 (A).... 973.48 \3\
4500-NH 3 E (18th).
Nesslerization or... ..................... 4500-NH3 C (18th ..................... ...................... D3590-89, 02 (A)....
Only).
Electrode........... ..................... 4500-NH3 F or G 4500-NH3 D or E...... 4500-NH3 D or E-97....
(18th) and 4500-NH3
D or E (19th).
Automated phenate 351.1 (Rev. 1978) \1\ ..................... ..................... ...................... .................... I-4551-78 \8\
colorimetric.
Semi-automated block 351.2, Rev. 2.0 ..................... ..................... ...................... D3590-89, 02 (B).... I-4515-91 \45\
digestor (1993).
colorimetric.
Manual or block ..................... ..................... ..................... ...................... D3590-89, 02 (A)....
digestor
potentiometric.
Block digester, ..................... ..................... ..................... ...................... .................... See footnote \39\
followed by Auto
distillation and
Titration, or.
Nesslerization, or.. ..................... ..................... ..................... ...................... .................... See footnote \40\
Flow injection gas ..................... ..................... ..................... ...................... .................... See footnote \41\
diffusion.
32. Lead--Total,\4\ mg/L......... Digestion \4\
followed by:
[[Page 19]]
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D3559-96, 03 (A or 974.27 \3\, I-3399-
\36\. B). 85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D3559-96, 03 (D).... I-4403-89 \51\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP \36\............ ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Voltametry \11\ or.. ..................... ..................... ..................... ...................... D3559-96, 03 (C)....
Colorimetric ..................... 3500-Pb D............ 3500-Pb B............ 3500-Pb B-97..........
(Dithizone).
33. Magnesium--Total,\4\ mg/L.... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. D511-93, 03(B)...... 974.27 \3\, I-3447-
85 \2\
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
DCP or.............. ..................... ..................... ..................... ...................... .................... See footnote \34\
Gravimetric......... ..................... 3500-Mg D............
Ion Chromatography.. ..................... ..................... ..................... ...................... D6919-03............
34. Manganese--Total,\4\ mg/L.... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. D858-95, 02 (A or B) 974.27 \3\, I-3454-
\36\. 85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D858-95, 02 (C).....
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP36, or........... ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500--Mn D........... 3500-Mn B............ 3500-Mn B-99.......... .................... 920.203 \3\
(Persulfate), or.
(Periodate)......... ..................... ..................... ..................... ...................... .................... See footnote \23\
35. Mercury--Total \4\, mg/L..... Cold vapor, manual 245.1, Rev. 3.0 3112 B............... ..................... 3112 B-99............. D3223-97, 02........ 977.22 \3\, I-3462-
or. (1994). 85\2\
Automated........... 245.2 (Issued 1974)..
[[Page 20]]
Cold vapor atomic 245.7 Rev. 2.0 (2005)
fluorescence \59\.
spectrometry
(CVAFS).
Purge and Trap CVAFS 1631E \43\...........
36. Molybdenum--Total \4\, mg/L.. Digestion \4\
followed by:
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99............. .................... I-3490-85 \2\
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. .................... I-3492-96 \47\
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
37. Nickel--Total,\4\ mg/L....... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D1886-90, 94 (98) (A I-3499-85 \2\
\36\. or B).
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D1886-90, 94 (98) I-4503-89 \51\
(C).
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP \36\, or........ ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Ni D (17th
(heptoxime). Edition).
38. Nitrate (as N), mg/L......... Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
[[Page 21]]
Ion Selective ..................... 4500-NO3 D.......... 4500-NO3 D.......... 4500-NO3 D-00........
Electrode.
Colorimetric 352.1 \1\............ ..................... ..................... ...................... .................... 973.50 \3\, 419D
(Brucine sulfate), \1,\ \7\, p. 28 \9\
or.
Nitrate-nitrite N
minus Nitrite N
(See parameters 39
and 40)..
39. Nitrate-nitrite (as N), mg/L. Cadmium reduction, ..................... 4500-NO3 E........... 4500-NO3 E........... 4500-NO3 E-00......... D3867-99(B).........
manual or.
Automated, or....... 353.2, Rev. 2.0 4500-NO3 F........... 4500-NO3 F........... 4500-NO3 F-00......... D3867-99(A)......... I-4545-85 \2\
(1993).
Automated hydrazine. ..................... 4500-NO3 H........... 4500-NO3 H........... 4500-NO3 H-00.........
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97............ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
40. Nitrite (as N), mg/L......... Spectrophotometric: ..................... 4500-NO2 B........... 4500-NO2 B........... 4500-NO2 B-00......... .................... See footnote \25\
Manual or.
Automated ..................... ..................... ..................... ...................... .................... I-4540-85 \2\
(Diazotization).
Automated (*bypass 353.2, Rev. 2.0 4500-NO3 F........... 4500-NO3 F........... 4500-NO3 F-00......... D3867-99(A)......... I-4545-85 \2\
cadmium reduction). (1993).
Manual (*bypass ..................... 4500-NO3 E........... 4500-NO3 E........... 4500-NO3 E-00......... D3867-99(B).........
cadmium reduction).
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev.2 \54\
41. Oil and grease--Total Hexane extractable 1664A \42\........... ..................... 5520 B \38\.......... 5520 B-01 \38\........
recoverable, mg/L. material (HEM): n-
Hexane extraction
and gravimetry.
Silica gel treated 1664A \42\...........
HEM (SGT-HEM):
Silica gel
treatment and
gravimetry..
[[Page 22]]
42. Organic carbon--Total (TOC), Combustion or ..................... 5310 B, C, or D...... 5310 B, C, or D...... 5310 B, C, or D-00.... D2579-93 (A or B)... 973.47,\3\ p. 14
mg/L. oxidation. \24\
43. Organic nitrogen (as N), mg/L Total Kjeldahl N
(Parameter 31)
minus ammonia N
(Parameter 4).
44. Orthophosphate (as P), mg/L.. Ascorbic acid
method:.
Automated, or....... 365.1, Rev. 2.0 4500-P F............. 4500-P F............. ...................... .................... 973.56 \3\, I-4601-
(1993). 85 \2\
Manual single ..................... 4500-P E............. 4500-P E............. ...................... D515-88(A).......... 973.55 \3\
reagent.
Manual two reagent.. 365.3 (Issued
1978)\1\.
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
45. Osmium--Total \4\, mg/L...... Digestion \4\
followed by:
AA direct ..................... 3111 D............... ..................... 3111 D-99.............
aspiration, or.
AA furnace.......... 252.2 (Issued 1978)
\1\.
46. Oxygen, dissolved, mg/L...... Winkler (Azide ..................... 4500-O C............. 4500-O C............. 4500-O C-01........... D888-92, 03 (A)..... 973.4 5B \3\, I-1575-
modification), or. 78 \8\
Electrode........... ..................... 4500-O G............. 4500-O G............. 4500-O G-01........... D888-92, 03 (B)..... I-1576-78 \8\
47. Palladium--Total,\4\ mg/L.... Digestion \4\
followed by:
AA direct ..................... 3111 B............... ..................... 3111 B-99............. .................... p. S27 \10\
aspiration, or.
AA furnace.......... 253.2 \1\ (Issued ..................... ..................... ...................... .................... p. S28 \10\
1978).
[[Page 23]]
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
48. Phenols, mg/L................ Manual distillation 420.1 \1\ (Rev. 1978) ..................... ..................... ...................... .................... See footnote \27\
\26\ Followed by:
Colorimetric (4AAP) 420.1 \1\ (Rev. 1978) ..................... ..................... ...................... .................... See footnote \27\
manual, or.
Automated........... 420.4 Rev. 1.0 (1993)
49. Phosphorus (elemental), mg/L. Gas-liquid ..................... ..................... ..................... ...................... .................... See footnote \28\
chromatography.
50. Phosphorus--Total, mg/L...... Persulfate digestion ..................... 4500-P B.5........... 4500-P B.5........... ...................... .................... 973.55 \3\
followed by: \20\
Manual or........... 365.3 \1\ (Issued 4500-P E............. 4500-P E............. ...................... D515-88(A)..........
1978).
Automated ascorbic 365.1 Rev. 2.0 (1993) 4500-P F............. 4500-P F............. ...................... .................... 973.56 \3\, I-4600-
acid reduction. 85 \2\
Semi-automated block 365.4 \1\ (Issued ..................... ..................... ...................... D515-88(B).......... I-4610-91 \48\
digestor. 1974).
51. Platinum--Total,\4\ mg/L..... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99.............
AA furnace.......... 255.2 \1\............
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
52. Potassium--Total,\4\ mg/L.... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. .................... 973.53 \3\, I-3630-
85 \2\
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
Flame photometric, ..................... 3500-K D............. 3500-K B............. 3500-K B-97...........
or.
Colorimetric........ ..................... ..................... ..................... ...................... .................... 317 B \17\
Ion Chromatography.. ..................... ..................... ..................... ...................... D6919-03............
53. Residue--Total, mg/L......... Gravimetric, 103- ..................... 2540 B............... 2540 B............... 2540 B-97............. .................... I-3750-85 \2\
105[deg].
54. Residue--filterable, mg/L.... Gravimetric, ..................... 2540 C............... 2540 C............... 2540 C-97............. .................... I-1750-85 \2\
180[deg].
55. Residue--non-filterable Gravimetric, 103-105 ..................... 2540 D............... 2540 D............... 2540 D-97............. .................... I-3765-85 \2\
(TSS), mg/L. [deg]C post washing
of residue.
56. Residue--settleable, mg/L.... Volumetric, (Imhoff ..................... 2540 F............... 2540 F............... 2540 F-97.............
cone), or
gravimetric.
57. Residue--Volatile, mg/L...... Gravimetric, 550 160.4 \1\............ ..................... ..................... ...................... .................... I-3753-85 \2\
[deg]C.
[[Page 24]]
58. Rhodium--Total,\4\ mg/L...... Digestion \4\
followed by:
AA direct ..................... 3111 B............... ..................... 3111 B-99.............
aspiration, or.
AA furnace.......... 265.2 \1\............
59. Ruthenium--Total,\4\ mg/L.... Digestion \4\
followed by:
AA direct ..................... 3111 B............... ..................... 3111 B-99.............
aspiration, or.
AA furnace.......... 267.2 \1\............
60. Selenium--Total,\4\ mg/L..... Digestion \4\
followed by:
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. D3859-98, 03 (B).... I-4668-98 \49\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
AA gaseous hydride.. ..................... 3114 B............... ..................... 3114 B-97............. D3859-98, 03 (A).... I-3667-85 \2\
61. Silica--Dissolved,\37\ mg/L.. 0.45 micron
filtration followed
by:
Colorimetric, Manual ..................... 4500-Si D............ 4500-SiO2 C.......... 4500-SiO2C-97......... D859-94, 00......... I-1700-85 \2\
or.
Automated ..................... ..................... ..................... ...................... .................... I-2700-85 \2\
(Molybdosilicate),
or.
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
62. Silver--Total,4, 31 mg/L..... Digestion 4, 29
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ .................... 974.27 \3\, p. 37
\9\, I-3720-85 \2\
[[Page 25]]
AA furnace.......... ..................... 3113 B............... ..................... 3113 B-99............. .................... I-4724-89 \51\
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
63. Sodium--Total,\4\ mg/L....... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. .................... 973.54 \3\, I-3735-
85 \2\
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
DCP, or............. ..................... ..................... ..................... ...................... .................... See footnote \34\
Flame photometric... ..................... 3500-Na D............ 3500-Na B............ 3500-Na B-97..........
Ion Chromatography.. ..................... ..................... ..................... ...................... D 6919-03...........
64. Specific conductance, Wheatstone bridge... 120.1 \1\ (Rev. 1982) 2510 B............... 2510 B............... 2510 B-97............. D1125-95 (99) (A)... 973.40 \3\, I-2781-
micromhos/cm at 25 [deg]C. 85 \2\
65. Sulfate (as SO4), mg/L....... Automated 375.2, Rev. 2.0
colorimetric. (1993).
Gravimetric......... ..................... 4500-SO4 \2\ C or D.. 4500-SO4 \2\ C or D.. ...................... .................... 925.54 \3\
Turbidimetric....... ..................... ..................... ..................... ...................... D516-90, 02......... 426C \3\0
Ion Chromatography.. 300.0, Rev 2.1 (1993) 4110 B............... 4110 B............... 4110 B-00............. D4327-97, 03........ 993.30 \3\
and 300.1, Rev 1.0
(1997).
CIE/UV.............. ..................... ..................... ..................... ...................... .................... D6508, Rev. 2 \54\
66. Sulfide (as S), mg/L......... Titrimetric ..................... 4500-S \2\ F (19th) 4500-S \2\ F......... 4500-S \2\ F-00....... .................... I-3840-85 \2\
(iodine), or. 4500-S \2\ E (18th).
Colorimetric ..................... 4500-S \2\ D......... 4500-S \2\ D......... 4500-S \2\ D-00.......
(methylene blue).
Ion Selective ..................... 4500-S \2\ G......... 4500-S \2\ G......... 4500-S \2\ G-00....... D4658-03............
Electrode.
67. Sulfite (as SO3), mg/L....... Titrimetric (iodine- ..................... 4500-SO3 \2\ B....... 4500-SO3 \2\ B....... 4500-SO3 \2\ B-00.....
iodate).
68. Surfactants, mg/L............ Colorimetric ..................... 5540 C............... 5540 C............... 5540 C-00............. D2330-88, 02........
(methylene blue).
69. Temperature, [deg]C.......... Thermometric........ ..................... 2550 B............... 2550 B............... 2550 B-00............. .................... See footnote \32\
70. Thallium--Total, \4\ mg/L.... Digestion \4\
followed by:
[[Page 26]]
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99.............
AA furnace.......... 279.2 \1\ (Issued
1978).
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99.............
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
71. Tin--Total,\4\ mg/L.......... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B............... ..................... 3111 B-99............. .................... I-3850-78 \8\
AA furnace, or...... ..................... 3113 B............... ..................... 3113 B-99.............
STGFAA.............. 200.9, Rev. 2.2
(1994).
ICP/AES............. 200.7, Rev. 4.4
(1994).
72. Titanium--Total,\4\ mg/L..... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99.............
AA furnace.......... 283.2 \1\ (Issued
1978).
DCP................. ..................... ..................... ..................... ...................... .................... See footnote \34\
73. Turbidity, NTU \53\.......... Nephelometric....... 180.1, Rev. 2.0 2130 B............... 2130 B............... 2130 B-01............. D1889-94, 00........ I-3860-85 \2\
(1993).
74. Vanadium--Total,\4\ mg/L..... Digestion \4\
followed by:
AA direct aspiration ..................... 3111 D............... ..................... 3111 D-99.............
AA furnace.......... ..................... ..................... ..................... ...................... D3373-93, 03........
ICP/AES............. 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99............. .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP, or............. ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric (Gallic ..................... 3500-V D............. 3500-V B............. 3500-V B-97...........
Acid).
[[Page 27]]
75. Zinc -Total \4\, mg/L........ Digestion \4\
followed by:
AA direct aspiration ..................... 3111 B or C.......... ..................... 3111 B or C-99........ D1691-95, 02 (A or 974.27 \3\, p. 37
\36\. B). \9\, I-3900-85 \2\
AA furnace.......... 289.2 \1\ (Issued
1978).
ICP/AES \36\........ 200.7, Rev. 4.4 3120 B............... 3120 B............... 3120 B-99 \59\........ .................... I-4471-97 \50\
(1994).
ICP/MS.............. 200.8, Rev. 5.4 ..................... ..................... ...................... D5673-03............ 993.14 \3\
(1994).
DCP,\36\ or......... ..................... ..................... ..................... ...................... D4190-94, 99........ See footnote \34\
Colorimetric ..................... 3500-Zn E............
(Dithizone) or.
(Zincon)............ ..................... 3500-Zn F............ 3500-Zn B............ 3500-Zn B-97.......... .................... See footnote \33\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Table 1B Notes:
\1\ ``Methods for Chemical Analysis of Water and Wastes,'' Environmental Protection Agency, Environmental Monitoring Systems Laboratory-Cincinnati (EMSL-CI), EPA-600/4-79-020 (NTIS PB 84-
128677), Revised March 1983 and 1979 where applicable.
\2\ Fishman, M. J., et al. ``Methods for Analysis of Inorganic Substances in Water and Fluvial Sediments,'' U.S. Department of the Interior, Techniques of Water-Resource Investigations of the
U.S. Geological Survey, Denver, CO, Revised 1989, unless otherwise stated.
\3\ ``Official Methods of Analysis of the Association of Official Analytical Chemists,'' Methods Manual, Sixteenth Edition, 4th Revision, 1998.
\4\ For the determination of total metals (which are equivalent to total recoverable metals) the sample is not filtered before processing. A digestion procedure is required to solubilize
analytes in suspended material and to break down organic-metal complexes (to convert the analyte to a detectable form for colorimetric analysis). For non-platform graphite furnace atomic
absorption determinations a digestion using nitric acid (as specified in Section 4.1.3 of Methods for the Chemical Analysis of Water and Wastes) is required prior to analysis. The procedure
used should subject the sample to gentle, acid refluxing and at no time should the sample be taken to dryness. For direct aspiration flame atomic absorption determinations (FLAA) a
combination acid (nitric and hydrochloric acids) digestion is preferred prior to analysis. The approved total recoverable digestion is described as Method 200.2 in Supplement I of ``Methods
for the Determination of Metals in Environmental Samples'' EPA/600R-94/111, May, 1994, and is reproduced in EPA Methods 200.7, 200.8, and 200.9 from the same Supplement. However, when using
the gaseous hydride technique or for the determination of certain elements such as antimony, arsenic, selenium, silver, and tin by non-EPA graphite furnace atomic absorption methods, mercury
by cold vapor atomic absorption, the noble metals and titanium by FLAA, a specific or modified sample digestion procedure may be required and in all cases the referenced method write-up
should be consulted for specific instruction and/or cautions. For analyses using inductively coupled plasma-atomic emission spectrometry (ICP-AES), the direct current plasma (DCP) technique
or the EPA spectrochemical techniques (platform furnace AA, ICP-AES, and ICP-MS) use EPA Method 200.2 or an approved alternate procedure (e.g., CEM microwave digestion, which may be used
with certain analytes as indicated in Table IB); the total recoverable digestion procedures in EPA Methods 200.7, 200.8, and 200.9 may be used for those respective methods. Regardless of the
digestion procedure, the results of the analysis after digestion procedure are reported as ``total'' metals.
\5\ Copper sulfate may be used in place of mercuric sulfate.
\6\ Manual distillation is not required if comparability data on representative effluent samples are on file to show that this preliminary distillation step is not necessary: however, manual
distillation will be required to resolve any controversies.
\7\ Ammonia, Automated Electrode Method, Industrial Method Number 379-75 WE, dated February 19, 1976, Bran & Luebbe (Technicon) Auto Analyzer II, Bran & Luebbe Analyzing Technologies, Inc.,
Elmsford, NY 10523.
\8\ The approved method is that cited in ``Methods for Determination of Inorganic Substances in Water and Fluvial Sediments'', USGS TWRI, Book 5, Chapter A1 (1979).
\9\ American National Standard on Photographic Processing Effluents, April 2, 1975. Available from ANSI, 25 West 43rd st., New York, NY 10036.
\10\ ``Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency,'' Supplement to the Fifteenth Edition of Standard Methods for the Examination of
Water and Wastewater (1981).
\11\ The use of normal and differential pulse voltage ramps to increase sensitivity and resolution is acceptable.
[[Page 28]]
\12\ Carbonaceous biochemical oxygen demand (CBOD5) must not be confused with the traditional BOD5 test method which measures ``total BOD.'' The addition of the nitrification inhibitor is not
a procedural option, but must be included to report the CBOD5 parameter. A discharger whose permit requires reporting the traditional BOD5 may not use a nitrification inhibitor in the
procedure for reporting the results. Only when a discharger's permit specifically states CBOD5 is required can the permittee report data using a nitrification inhibitor.
\13\ OIC Chemical Oxygen Demand Method, Oceanography International Corporation, 1978, 512 West Loop, P.O. Box 2980, College Station, TX 77840.
\14\ Chemical Oxygen Demand, Method 8000, Hach Handbook of Water Analysis, 1979, Hach Chemical Company, P.O. Box 389, Loveland, CO 80537.
\15\ The back titration method will be used to resolve controversy.
\16\ Orion Research Instruction Manual, Residual Chlorine Electrode Model 97-70, 1977, Orion Research Incorporated, 840 Memorial Drive, Cambridge, MA 02138. The calibration graph for the Orion
residual chlorine method must be derived using a reagent blank and three standard solutions, containing 0.2, 1.0, and 5.0 mL 0.00281 N potassium iodate/100 mL solution, respectively.
\17\ The approved method is that cited in Standard Methods for the Examination of Water and Wastewater, 14th Edition, 1976.
\18\ National Council of the Paper Industry for Air and Stream Improvement, Inc., Technical Bulletin 253, December 1971.
\19\ Copper, Biocinchoinate Method, Method 8506, Hach Handbook of Water Analysis, 1979, Hach Chemical Company, P.O. Box 389, Loveland, CO 80537.
\20\ When using a method with block digestion, this treatment is not required.
\21\ Hydrogen ion (pH) Automated Electrode Method, Industrial Method Number 378-75WA, October 1976, Bran & Luebbe (Technicon) Autoanalyzer II. Bran & Luebbe Analyzing Technologies, Inc.,
Elmsford, NY 10523.
\22\ Iron, 1,10-Phenanthroline Method, Method 8008, 1980, Hach Chemical Company, P.O. Box 389, Loveland, CO 80537.
\23\ Manganese, Periodate Oxidation Method, Method 8034, Hach Handbook of Wastewater Analysis, 1979, pages 2-113 and 2-117, Hach Chemical Company, Loveland, CO 80537.
\24\ Wershaw, R. L.,et al., ``Methods for Analysis of Organic Substances in Water,'' Techniques of Water-Resources Investigation of the U.S. Geological Survey, Book 5, Chapter A3, (1972
Revised 1987) p. 14.
\25\ Nitrogen, Nitrite, Method 8507, Hach Chemical Company, P.O. Box 389, Loveland, CO 80537.
\26\ Just prior to distillation, adjust the sulfuric-acid-preserved sample to pH 4 with 1 + 9 NaOH.
\27\ The approved method is cited in Standard Methods for the Examination of Water and Wastewater, 14th Edition. The colorimetric reaction is conducted at a pH of 10.00.2. The approved methods are given on pp 576-81 of the 14th Edition: Method 510A for distillation, Method 510B for the manual colorimetric procedure, or Method 510C for the manual
spectrometric procedure.
\28\ R.F. Addison and R. G. Ackman, ``Direct Determination of Elemental Phosphorus by Gas-Liquid Chromatography,'' Journal of Chromatography, Vol. 47, No.3, pp. 421-426, 1970.
\29\ Approved methods for the analysis of silver in industrial wastewaters at concentrations of 1 mg/L and above are inadequate where silver exists as an inorganic halide. Silver halides such
as the bromide and chloride are relatively insoluble in reagents such as nitric acid but are readily soluble in an aqueous buffer of sodium thiosulfate and sodium hydroxide to pH of 12.
Therefore, for levels of silver above 1 mg/L, 20 mL of sample should be diluted to 100 mL by adding 40 mL each of 2 M Na2S2O3 and NaOH. Standards should be prepared in the same manner. For
levels of silver below 1 mg/L the approved method is satisfactory.
\30\ The approved method is that cited in Standard Methods for the Examination of Water and Wastewater, 15th Edition.
\31\ For samples known or suspected to contain high levels of silver (e.g., in excess of 4 mg/L), cyanogen iodide should be used to keep the silver in solution for analysis. Prepare a cyanogen
iodide solution by adding 4.0 mL of concentrated NH4OH, 6.5 g of KCN, and 5.0 mL of a 1.0 N solution of I2 to 50 mL of reagent water in a volumetric flask and dilute to 100.0 mL. After
digestion of the sample, adjust the pH of the digestate to >7 to prevent the formation of HCN under acidic conditions. Add 1 mL of the cyanogen iodide solution to the sample digestate and
adjust the volume to 100 mL with reagent water (NOT acid). If cyanogen iodide is added to sample digestates, then silver standards must be prepared that contain cyanogen iodide as well.
Prepare working standards by diluting a small volume of a silver stock solution with water and adjusting the pH>7 with NH4OH. Add 1 mL of the cyanogen iodide solution and let stand 1 hour.
Transfer to a 100-mL volumetric flask and dilute to volume with water.
\32\ Stevens, H.H., Ficke, J. F., and Smoot, G. F., ``Water Temperature--Influential Factors, Field Measurement and Data Presentation,'' Techniques of Water-Resources Investigations of the
U.S. Geological Survey, Book 1, Chapter D1, 1975.
\33\ Zinc, Zincon Method, Method 8009, Hach Handbook of Water Analysis, 1979, pages 2-231 and 2-333, Hach Chemical Company, Loveland, CO 80537.
\34\ ``Direct Current Plasma (DCP) Optical Emission Spectrometric Method for Trace Elemental Analysis of Water and Wastes, Method AES0029,'' 1986--Revised 1991, Thermo Jarrell Ash Corporation,
27 Forge Parkway, Franklin, MA 02038
\35\ Precision and recovery statements for the atomic absorption direct aspiration and graphite furnace methods, and for the spectrophotometric SDDC method for arsenic are provided in Appendix
D of this part titled, ``Precision and Recovery Statements for Methods for Measuring Metals.''
\36\ Microwave-assisted digestion may be employed for this metal, when analyzed by this methodology. ``Closed Vessel Microwave Digestion of Wastewater Samples for Determination of Metals'',
CEM Corporation, P.O. Box 200, Matthews, NC 28106-0200, April 16, 1992. Available from the CEM Corporation.
\37\ When determining boron and silica, only plastic, PTFE, or quartz laboratory ware may be used from start until completion of analysis.
[[Page 29]]
\38\ Only use n-hexane extraction solvent when determining Oil and Grease parameters--Hexane Extractable Material (HEM), or Silica Gel Treated HEM (analogous to EPA Method 1664A). Use of other
extraction solvents (e.g., those in the 18th and 19th editions) is prohibited.
\39\ Nitrogen, Total Kjeldahl, Method PAI-DK01 (Block Digestion, Steam Distillation, Titrimetric Detection), revised 12/22/94, OI Analytical/ALPKEM, P.O. Box 9010, College Station, TX 77842.
\40\ Nitrogen, Total Kjeldahl, Method PAI-DK02 (Block Digestion, Steam Distillation, Colorimetric Detection), revised 12/22/94, OI Analytical/ALPKEM, P.O. Box 9010, College Station, TX 77842.
\41\ Nitrogen, Total Kjeldahl, Method PAI-DK03 (Block Digestion, Automated FIA Gas Diffusion), revised 12/22/94, OI Analytical/ALPKEM, P.O. Box 9010, College Station, TX 77842.
\42\ Method 1664, Revision A ``n-Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel Treated n-Hexane Extractable Material (SGT-HEM; Non-polar Material) by Extraction and
Gravimetry'' EPA-821-R-98-002, February 1999. Available at NTIS, PB-121949, U.S. Department of Commerce, 5285 Port Royal, Springfield, VA 22161.
\43\ USEPA. 2001. Method 1631, Revision E, ``Mercury in Water by Oxidation, Purge and Trap, and Cold Vapor Atomic Fluorescence Spectrometry'' September 2002, Office of Water, U.S.
Environmental Protection Agency (EPA-821-R-02-024). The application of clean techniques described in EPA's draft Method 1669: Sampling Ambient Water for Trace Metals at EPA Water Quality
Criteria Levels (EPA-821-R-96-011) are recommended to preclude contamination at low-level, trace metal determinations.
\44\ Available Cyanide, Method OIA-1677, ``Available Cyanide by Flow Injection, Ligand Exchange, and Amperometry,'' ALPKEM, A Division of OI Analytical, P.O. Box 9010, College Station, TX
77842-9010.
\45\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Ammonia Plus Organic Nitrogen by a Kjeldahl Digestion Method,'' Open File Report
(OFR) 00-170.
\46\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Chromium in Water by Graphite Furnace Atomic Absorption Spectrophotometry,'' Open
File Report (OFR) 93-449.
\47\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Molybdenum by Graphite Furnace Atomic Absorption Spectrophotometry,'' Open File
Report (OFR) 97-198.
\48\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Total Phosphorus by Kjeldahl Digestion Method and an Automated Colorimetric Finish
That Includes Dialysis'' Open File Report (OFR) 92-146.
\49\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Arsenic and Selenium in Water and Sediment by Graphite Furnace-Atomic Absorption
Spectrometry'' Open File Report (OFR) 98-639.
\50\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Elements in Whole-water Digests Using Inductively Coupled Plasma-Optical Emission
Spectrometry and Inductively Coupled Plasma-Mass Spectrometry,'' Open File Report (OFR) 98-165.
\51\ ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Inorganic and Organic Constituents in Water and Fluvial Sediment,'' Open File
Report (OFR) 93-125.
\52\ All EPA methods, excluding EPA Method 300.1, are published in ``Methods for the Determination of Metals in Environmental Samples,'' Supplement I, National Exposure Risk Laboratory-
Cincinnati (NERL-CI), EPA/600/R-94/111, May 1994; and ``Methods for the Determination of Inorganic Substances in Environmental Samples,'' NERL-CI, EPA/600/R-93/100, August, 1993. EPA Method
300.1 is available from http://www.epa.gov/safewater/methods/pdfs/met300.pdf.
\53\ Styrene divinyl benzene beads (e.g., AMCO-AEPA-1 or equivalent) and stabilized formazin (e.g., Hach StablCal\TM\ or equivalent) are acceptable substitutes for formazin.
\54\ Method D6508, Rev. 2, ``Test Method for Determination of Dissolved Inorganic Anions in Aqueous Matrices Using Capillary Ion Electrophoresis and Chromate Electrolyte,'' available from
Waters Corp, 34 Maple St., Milford, MA, 01757, Telephone: 508/482-2131, Fax: 508/482-3625.
\55\ Kelada-01, ``Kelada Automated Test Methods for Total Cyanide, Acid Dissociable Cyanide, and Thiocyanate,'' EPA 821-B-01-009, Revision 1.2, August 2001, National Technical Information
Service (NTIS), 5285 Port Royal Road, Springfield, VA 22161 [Order Number PB 2001-108275]. The toll free telephone number is: 800-553-6847. Note: A 450-W UV lamp may be used in this method
instead of the 550-W lamp specified if it provides performance within the quality control (QC) acceptance criteria of the method in a given instrument. Similarly, modified flow cell
configurations and flow conditions may be used in the method, provided that the QC acceptance criteria are met.
\56\ QuikChem Method 10-204-00-1-X, ``Digestion and Distillation of Total Cyanide in Drinking and Wastewaters using MICRO DIST and Determination of Cyanide by Flow Injection Analysis'' is
available from Lachat Instruments 6645 W. Mill Road, Milwaukee, WI 53218, Telephone: 414-358-4200.
\57\ When using sulfide removal test procedures described in Method 335.4, reconstitute particulate that is filtered with the sample prior to distillation.
\58\ Unless otherwise stated, if the language of this table specifies a sample digestion and/or distillation ``followed by'' analysis with a method, approved digestion and/or distillation are
required prior to analysis.
\59\ Method 245.7, Rev. 2.0, ``Mercury in Water by Cold Vapor Atomic Fluorescence Spectrometry,'' February 2005, EPA-821-R-05-001, available from the U.S. EPA Sample Control Center (operated
by CSC), 6101 Stevenson Avenue, Alexandria, VA 22304, Telephone: 703-461-2100, Fax: 703-461-8056.
[[Page 30]]
\60\ The use of EDTA may decrease method sensitivity in some samples. Analysts may omit EDTA provided that all method specified quality control acceptance criteria are met.
\61\ Samples analyzed for available cyanide using Methods OIA-1677 or D6888-04 that contain particulate matter may be filtered only after the ligand exchange reagents have been added to the
samples, because the ligand exchange process converts complexes containing available cyanide to free cyanide, which is not removed by filtration. Analysts are further cautioned to limit the
time between the addition of the ligand exchange reagents and sample analysis to no more than 30 minutes to preclude settling of materials in samples.
Table IC--List of Approved Test Procedures for Non-Pesticide Organic Compounds
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
EPA method number \2,7\ Other approved methods
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Parameter \1\ Standard Methods
GC GC/MS HPLC [Edition(s)] Standard Methods Online ASTM Other
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Acenaphthene.................. 610 625, 1625B........... 610 6440 B [18th, 19th, 20th] ......................... D4657-92 (99)............ See footnote \9\, p. 27
2. Acenaphthylene................ 610 625, 1625B........... 610 6410 B, 6440 B, [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
3. Acrolein...................... 603 624 \4\, 1624B.......
4. Acrylonitrile................. 603 624 \4\, 1624B.......
5. Anthracene.................... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
6. Benzene....................... 602 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th,19th], 6200 C
[20th] and 6220 B
[18th,19th].
7. Benzidine..................... ............ 625 \5\, 1625B....... 605 ......................... ......................... ......................... See footnote \3\, p.1
8. Benzo(a)anthracene............ 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
9. Benzo(a)pyrene................ 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
10. Benzo(b)fluoranthene......... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
11. Benzo(g,h,i) perylene........ 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
12. Benzo(k) fluoranthene........ 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
13. Benzyl chloride.............. ............ ..................... ............ ......................... ......................... ......................... See footnote \3\, p. 130:
See footnote \6\, p.
S102
14. Benzyl butyl phthalate....... 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
[[Page 31]]
15. Bis(2-chloroethoxy) methane.. 611 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
16. Bis(2-chloroethyl) ether..... 611 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
17. Bis(2-ethylhexyl) phthalate.. 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
18. Bromodichloro-methane........ 601 624, 1624B........... ............ 6200 C [20th] and 6230 B 6200 B and C-97..........
[18th, 19th], 6200 B
[20th] and 6210 B [18th,
19th].
19. Bromoform.................... 601 624, 1624B........... ............ 6200 C [20th] and 6230 B 6200 B and C-97..........
[18th, 19th], 6200 B
[20th] and 6210 B [18th,
19th].
20. Bromomethane................. 601 624, 1624B........... ............ 6200 C [20th] and 6230 B 6200 B and C-97..........
[18th, 19th], 6200 B
[20th] and 6210 B [18th,
19th].
21. 4-Bromophenyl phenyl ether... 611 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
22. Carbon tetrachloride......... 601 624, 1624B........... ............ 6200 C [20th] and 6230 B 6200 C-97................ ......................... See footnote \3\, p. 130
[18th, 19th].
23. 4-Chloro-3-methyl phenol..... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
24. Chlorobenzene................ 601, 602 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97.......... ......................... See footnote \3\, p. 130
[18th, 19th], 6200 C
[20th] and 6220 B [18th,
19th], 6200 C [20th] and
6230 B [18th, 19th].
25. Chloroethane................. 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
[[Page 32]]
26. 2-Chloroethylvinyl ether..... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
27. Chloroform................... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97.......... ......................... See footnote \3\, p. 130
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
28. Chloromethane................ 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th] 6200 C
[20th] and 6230 B [18th,
19th].
29. 2-Chloronaph-thalene......... 612 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
30. 2-Chlorophenol............... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B(00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
31. 4-Chlorophenyl phenyl ether.. 611 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
32. Chrysene..................... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
33. Dibenzo(a,h)an-thracene...... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
34. Dibromochloro-methane........ 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th] 6200 C
[20th] and 6230 B [18th,
19th].
35. 1,2-Dichloro-benzene......... 601, 602 624, 1625B........... ............ 6200 C [20th] and 6220 B 6200 C-97................ ......................... See footnote \9\, p. 27
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
[[Page 33]]
36. 1,3-Dichloro-benzene......... 601, 602 624, 1625B........... ............ 6200 C [20th] and 6220 B 6200 C-97................ ......................... See footnote \9\, p. 27
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
37. 1,4-Dichloro-benzene......... 601, 602 624, 1625B........... ............ 6200 C [20th] and 6220 B 6200 C-97................ ......................... See footnote \9\, p. 27
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
38. 3,3-Dichloro-benzidine....... ............ 625, 1625B........... 605 6410 B [18th, 19th, 20th] 6410 B-00................
39. Dichlorodifluoro-methane..... 601 ..................... ............ 6200 C [20th] and 6230 B 6200 C-97................
[18th, 19th].
40. 1,1-Dichloroethane........... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
41. 1,2-Dichloroethane........... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
42. 1,1-Dichloroethene........... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
43. trans-1,2-Dichloro-ethene.... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
44. 2,4-Dichlorophenol........... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
45. 1,2-Dichloro-propane......... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
[[Page 34]]
46. cis-1,3-Dichloro-propene..... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
47. trans-1,3-Dichloro-propene... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
48. Diethyl phthalate............ 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
49. 2,4-Dimethylphenol........... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
50. Dimethyl phthalate........... 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
51. Di-n-butyl phthalate......... 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
52. Di-n-octyl phthalate......... 606 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
53. 2,3-Dinitrophenol............ 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... .........................
19th, 20th].
54. 2,4-Dinitrotoluene........... 609 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
55. 2,6-Dinitrotoluene........... 609 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
56. Epichlorohydrin.............. ............ ..................... ............ ......................... ......................... ......................... See footnote \3\, p. 130;
See footnote \6\, p.
S102
57. Ethylbenzene................. 602 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97.......... ......................... .........................
[18th, 19th], 6200 C
[20th] and 6220 B [18th,
19th].
58. Fluoranthene................. 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
[[Page 35]]
59. Fluorene..................... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
60. 1,2,3,4,6,7,8-Heptachloro- ............ 1613B \10\...........
dibenzofuran.
61. 1,2,3,4,7,8,9-Heptachloro- ............ 1613B \10\...........
dibenzofuran.
62. 1,2,3,4,6,7,8- ............ 1613B \10\...........
Heptachlorodibenzo-p-dioxin.
63. Hexachlorobenzene............ 612 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
64. Hexachloro-butadiene......... 612 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
65. Hexachlorocyclo-pentadiene... 612 625 \5\, 1625B....... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
66. 1,2,3,4,7,8- ............ 1613B \10\...........
Hexachlorodibenzofuran.
67. 1,2,3,6,7,8- ............ 1613B \10\...........
Hexachlorodibenzofuran.
68. 1,2,3,7,8,9- ............ 1613B \10\...........
Hexachlorodibenzofuran.
69. 2,3,4,6,7,8- ............ 1613B \10\...........
Hexachlorodibenzofuran.
70. 1,2,3,4,7,8-Hexachlorodibenzo- ............ 1613B \10\...........
p-dioxin.
71. 1,2,3,6,7,8-Hexachlorodibenzo- ............ 1613B \10\...........
p-dioxin.
72. 1,2,3,7,8,9-Hexachlorodibenzo- ............ 1613B \10\...........
p-dioxin 1613B \10\.
73. Hexachloroethane............. 612 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
74. Ideno(1,2,3-cd) pyrene....... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
75. Isophorone................... 609 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
[[Page 36]]
76. Methylene chloride........... 601 624, 1624B........... ............ 6200 C [20th] and 6230 B 6200 C-97................ ......................... See footnote \3\, p. 130
[18th, 19th].
77. 2-Methyl-4,6-dinitrophenol... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
78. Naphthalene.................. 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ ......................... See footnote \9\, p. 27
19th, 20th].
79. Nitrobenzene................. 609 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
80. 2-Nitrophenol................ 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
81. 4-Nitrophenol................ 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
82. N-Nitrosodimethylamine....... 607 6255, 1625B.......... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
83. N-Nitrosodi-n-propylamine.... 607 6255, 1625B.......... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
84. N-Nitrosodiphenylamine....... 607 6255, 1625B.......... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \9\, p. 27
85. Octachlorodibenzofuran....... ............ 1613B \10\*..........
86. Octachlorodibenzo-p-dioxin... ............ 1613B \10\...........
87. 2,2'-Oxybis(2-chloropropane) 611 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................
[also known as bis(2-
chloroisopropyl) ether].
88. PCB-1016..................... 608 625.................. ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 43;
See footnote \8\
89. PCB-1221..................... 608 625.................. ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 43;
See footnote \8\
90. PCB-1232..................... 608 625.................. ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 43;
See footnote \8\
[[Page 37]]
91. PCB-1242..................... 608 625.................. ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 43;
See footnote \8\
92. PCB-1248..................... 608 625..................
93. PCB-1254..................... 608 625.................. ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 43;
See footnote \8\
94. PCB-1260..................... 608 625.................. ............ 6410 B, 6630 B [18th, 6410 B-00................ ......................... See footnote 3, p. 43;
19th, 20th]. See footnote 8
95. 1,2,3,7,8-Pentachloro- ............ 1613B\10\............
dibenzofuran.
96. 2,3,4,7,8-Pentachloro- ............ 1613B\10\............
dibenzofuran.
97. 1,2,3,7,8,-Pentachlorodibenzo- ............ 1613B\10\............
p-dioxin.
98. Pentachlorophenol............ 604 625, 1625B........... ............ 6410 B, 6630 B [18th, 6410 B-00................ ......................... See footnote \3\, p. 140;
19th, 20th]. See footnote \9\, p. 27
99. Phenanthrene................. 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
100. Phenol...................... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
101. Pyrene...................... 610 625, 1625B........... 610 6410 B, 6440 B [18th, 6410 B-00................ D4657-92 (99)............ See footnote \9\, p. 27
19th, 20th].
102. 2,3,7,8-Tetra- ............ 1613B10..............
chlorodibenzofuran.
103. 2,3,7,8-Tetra-chlorodibenzo- ............ 613, 625 \5a\, 1613B
p-dioxin. \10\.
104. 1,1,2,2-Tetra-chloro ethane. 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97.......... ......................... See footnote \3\, p. 130
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
105. Tetrachloroethene........... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97.......... ......................... See footnote \3\, p. 130
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
[[Page 38]]
106. Toluene..................... 602 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6220 B [18th,
19th].
107. 1,2,4-Trichloro-benzene..... 612 625, 1625B........... ............ 6410 B [18th, 19th, 20th] 6410 B-00................ ......................... See footnote \3\, p. 130;
See footnote \9\, p. 27
108. 1,1,1-Trichloro-ethane...... 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
109. 1,1,2-Trichloro-ethane...... 601 624, 1624B........... 6200 B 6200 B and C-97.......... ......................... See footnote \3\, p. 130.
[20th] and
6210 B
[18th,
19th], 6200
C [20th] and
6230 B
[18th, 19th]
110. Trichloroethene............. 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
111. Trichlorofluoro-methane..... 601 624.................. ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C
[20th] and 6230 B [18th,
19th].
112. 2,4,6-Trichlorophenol....... 604 625, 1625B........... ............ 6410 B, 6420 B [18th, 6410 B-00, 6420 B-00..... ......................... See footnote \9\, p. 27
19th, 20th].
[[Page 39]]
113. Vinyl chloride.............. 601 624, 1624B........... ............ 6200 B [20th] and 6210 B 6200 B and C-97..........
[18th, 19th], 6200 C [20th] and
6230 B [18th, 19th].
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ All parameters are expressed in micrograms per liter ([mu]g/L) except for Method 1613B in which the parameters are expressed in picograms per liter (pg/L).
\2\ The full text of Methods 601-613, 624, 625, 1624B, and 1625B, are given at Appendix A, ``Test Procedures for Analysis of Organic Pollutants,'' of this part 136. The full text of Method
1613B is incorporated by reference into this part 136 and is available from the National Technical Information Services as stock number PB95-104774. The standardized test procedure to be
used to determine the method detection limit (MDL) for these test procedures is given at Appendix B, ``Definition and Procedure for the Determination of the Method Detection Limit,'' of this
part 136.
\3\ ``Methods for Benzidine: Chlorinated Organic Compounds, Pentachlorophenol and Pesticides in Water and Wastewater,'' U.S. Environmental Protection Agency, September, 1978.
\4\ Method 624 may be extended to screen samples for Acrolein and Acrylonitrile. However, when they are known to be present, the preferred method for these two compounds is Method 603 or
Method 1624B.
\5\ Method 625 may be extended to include benzidine, hexachlorocyclopentadiene, N-nitrosodimethylamine, and N-nitrosodiphenylamine. However, when they are known to be present, Methods 605,
607, and 612, or Method 1625B, are preferred methods for these compounds.
\5a\ 625, screening only.
\6\ ``Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency,'' Supplement to the Fifteenth Edition of Standard Methods for the Examination of
Water and Wastewater (1981).
\7\ Each analyst must make an initial, one-time demonstration of their ability to generate acceptable precision and accuracy with Methods 601-603, 624, 625, 1624B, and 1625B (See appendix A of
this part 136) in accordance with procedures each in Section 8.2 of each of these methods. Additionally, each laboratory, on an on-going basis must spike and analyze 10% (5% for methods 624
and 625 and 100% for methods 1624B and 1625B) of all samples to monitor and evaluate laboratory data quality in accordance with Sections 8.3 and 8.4 of these methods. When the recovery of
any parameter falls outside the warning limits, the analytical results for that parameter in the unspiked sample are suspect. The results should be reported, but cannot be used to
demonstrate regulatory compliance. These quality control requirements also apply to the Standard Methods, ASTM Methods, and other methods cited.
\8\ ``Organochlorine Pesticides and PCBs in Wastewater Using Empore\TM\ Disk'' 3M Corporation Revised 10/28/94.
\9\ USGS Method 0-3116-87 from ``Methods of Analysis by U.S. Geological Survey National Water Quality Laboratory--Determination of Inorganic and Organic Constituents in Water and Fluvial
Sediments,'' U.S. Geological Survey, Open File Report 93-125.
\10\ Analysts may use Fluid Management Systems, Inc. PowerPrep system in place of manual cleanup provided that the analysis meet the requirements of Method 1613B (as specified in Section 9 of
the method) and permitting authorities.
Table ID--List of Approved Test Procedures for Pesticides \1\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
EPA \2,\ Standard Methods 18th,
Parameter Method \7\ 19th, 20th Ed. Standard Methods Online ASTM Other
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Aldrin........................ GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96 (2002)......... 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
2. Ametryn....................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\, p
S68
3. Aminocarb..................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 94; See footnote \6\,
p. S16
4. Atraton....................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68
[[Page 40]]
5. Atrazine...................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68; See footnote \9\
6. Azinphos methyl............... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 25; See footnote \6\,
p. S51
7. Barban........................ TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
8. [alpha]-BHC................... GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \8\
D5812-96(02)............
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
9. [beta]-BHC.................... GC.................. 608 6630 C.................. ........................ D3086-90,............... See footnote \8\
D5812-96(02)............
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
10. [delta]-BHC.................. GC.................. 608 6630 C.................. ........................ D3086-90,............... See footnote \8\
D5812-96(02)............
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
11. [gamma]-BHC (Lindane)........ GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
....................
12. Captan....................... GC.................. ........... 6630 B.................. ........................ D3086-90,............... See footnote \3\, p. 7
D5812-96(02)............
13. Carbaryl..................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 94, See footnote \6\,
p. S60
14. Carbo-phenothion............. GC.................. ........... ........................ ........................ ........................ See footnote \4\, p. 27; See footnote \6\,
p. S73
15. Chlordane.................... GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
16. Chloro-propham............... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64.
17. 2,4-D........................ GC.................. ........... 6640 B.................. ........................ ........................ See footnote \3\, p. 115; See footnote \4\,
p. 40
18. 4,4[min]-DDD................. GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
19. 4,4[min]-DDE................. GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
[[Page 41]]
20. 4,4[min]-DDT................. GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
21. Demeton-O.................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 25; See footnote \6\,
p. S51
22. Demeton-S.................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 25; See footnote \6\,
p. S51
23. Diazinon..................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 25; See footnote \4\,
p. 27; See footnote \6\, p. S51
24. Dicamba...................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 115
25. Dichlofen-thion.............. GC.................. ........... ........................ ........................ ........................ See footnote \4\, p. 27; See footnote \6\,
p. S73
26. Dichloran.................... GC.................. ........... 6630 B & C.............. ........................ ........................ See footnote \3\, p. 7
27. Dicofol...................... GC.................. ........... ........................ ........................ D3086-90,...............
D5812-96(02)............
28. Dieldrin..................... GC.................. 608 6630 B & C.............. ........................ ........................ See footnote \3\, p. 7; See footnote \4\, p.
27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
29. Dioxathion................... GC.................. ........... ........................ ........................ ........................ See footnote \4\, p. 27; See footnote \6\,
p. S73
30. Disulfoton................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 25; See footnote \6\,
p. S51
31. Diuron....................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
32. Endosulfan I................. GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
33. Endosulfan II................ GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \8\
D5812-96(02)............
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
34. Endosulfan Sulfate........... GC.................. 608 6630 C.................. ........................ ........................ See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
35. Endrin....................... GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
D5812-96(02)............ 27; See footnote \8\
GC/MS............... 625 \5\ 6410 B.................. 6410 B-00...............
36. Endrin aldehyde.............. GC.................. 608 ........................ ........................ ........................ See footnote \8\
GC/MS............... 625
37. Ethion....................... GC.................. ........... ........................ ........................ ........................ See footnote \4\, p. 27; See footnote \6\,
p. S73
38. Fenuron...................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
39. Fenuron-TCA.................. TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
[[Page 42]]
40. Heptachlor................... GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
GC/MS............... 625 6410 B.................. 6410 B-00............... D5812-96(02)............ 27; See footnote \8\
41. Heptachlor epoxide........... GC.................. 608 6630 B & C.............. ........................ D3086-90,............... See footnote \3\, p. 7; See footnote \4\, p.
GC/MS............... 625 6410 B.................. 6410 B-00............... D5812- 96(02)........... 27; See footnote \6\, p. S73; See footnote
\8\
42. Isodrin...................... GC.................. ........... ........................ ........................ ........................ See footnote \4\, p. 27; See footnote \6\,
p. S73
43. Linuron...................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
44. Malathion.................... GC.................. ........... 6630 C.................. ........................ ........................ See footnote \3\, p. 25; See footnote \4\,
p. 27; See footnote \6\, p. S51
45. Methiocarb................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 94; See footnote \6\,
p. S60
46. Methoxy-chlor................ GC.................. ........... 6630 B & C.............. ........................ D3086-90, D5812-96(02).. See footnote \3\, p. 7; See footnote \4\, p.
27; See footnote \8\
47. Mexacar-bate................. TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 94; See footnote \6\,
p. S60
48. Mirex........................ GC.................. ........... 6630 B & C.............. ........................ ........................ See footnote \3\, p. 7; See footnote \4\, p.
27
49. Monuron...................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
50. Monuron-TCA.................. TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
51. Nuburon...................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
52. Parathion methyl............. GC.................. ........... 6630 C.................. ........................ ........................ See footnote \3\, p. 25; See footnote \4\,
p. 27
53. Parathion ethyl.............. GC.................. ........... 6630 C.................. ........................ ........................ See footnote \3\, p. 25; See footnote \4\,
p. 27
54. PCNB......................... GC.................. ........... 6630 B & C.............. ........................ ........................ See footnote \3\, p. 7
55. Perthane..................... GC.................. ........... ........................ ........................ D3086-90, D5812-96(02).. See footnote \4\, p. 27
56. Prometon..................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68; See footnote \9\
57. Prometryn.................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68; See footnote \9\
58. Propazine.................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68; See footnote \9\
[[Page 43]]
59. Propham...................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
60. Propoxur..................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 94; See footnote \6\,
p. S60
61. Secbumeton................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68
62. Siduron...................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
63. Simazine..................... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68; See footnote \9\
64. Strobane..................... GC.................. ........... 6630 B & C.............. ........................ ........................ See footnote \3\, p. 7
65. Swep......................... TLC................. ........... ........................ ........................ ........................ See footnote \3\, p. 104; See footnote \6\,
p. S64
66. 2,4,5-T...................... GC.................. ........... 6640 B.................. ........................ ........................ See footnote \3\, p. 115; See footnote \4\,
p. 40
67. 2,4,5-TP (Silvex)............ GC.................. ........... 6640 B.................. ........................ ........................ See footnote \3\, p. 115; See footnote \4\,
p. 40
68. Terbuthylazine............... GC.................. ........... ........................ ........................ ........................ See footnote \3\, p. 83; See footnote \6\,
p. S68
69. Toxaphene.................... GC.................. 608 6630 B & C.............. ........................ D3086-90, D5812-96(02).. See footnote \3\, p. 7; See footnote \4\, p.
27; See footnote \8\
GC/MS............... 625 6410 B.................. 6410 B-00...............
70. Trifluralin.................. GC.................. ........... 6630 B.................. ........................ ........................ See footnote \3\, p. 7; See footnote \9\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Pesticides are listed in this table by common name for the convenience of the reader. Additional pesticides may be found under Table IC, where entries are listed by chemical name.
\2\ The full text of Methods 608 and 625 are given at Appendix A, ``Test Procedures for Analysis of Organic Pollutants,'' of this part 136. The standardized test procedure to be used to
determine the method detection limit (MDL) for these test procedures is given at Appendix B, ``Definition and Procedure for the Determination of the Method Detection Limit,'' of this part
136.
\3\ ``Methods for Benzidine, Chlorinated Organic Compounds, Pentachlorophenol and Pesticides in Water and Wastewater,'' U.S. Environmental Protection Agency, September 1978. This EPA
publication includes thin-layer chromatography (TLC) methods.
\4\``Methods for Analysis of Organic Substances in Water and Fluvial Sediments,'' Techniques of Water-Resources Investigations of the U.S. Geological Survey, Book 5, Chapter A3 (1987).
\5\ The method may be extended to include [alpha]-BHC, [gamma]-BHC, endosulfan I, endosulfan II, and endrin. However, when they are known to exist, Method 608 is the preferred method.
\6\ ``Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency.'' Supplement to the Fifteenth Edition of Standard Methods for the Examination of
Water and Wastewater (1981).
\7\ Each analyst must make an initial, one-time, demonstration of their ability to generate acceptable precision and accuracy with Methods 608 and 625 (See appendix A of this part 136) in
accordance with procedures given in Section 8.2 of each of these methods. Additionally, each laboratory, on an on-going basis, must spike and analyze 10% of all samples analyzed with Method
608 or 5% of all samples analyzed with Method 625 to monitor and evaluate laboratory data quality in accordance with Sections 8.3 and 8.4 of these methods. When the recovery of any parameter
falls outside the warning limits, the analytical results for that parameter in the unspiked sample are suspect. The results should be reported, but cannot be used to demonstrate regulatory
compliance. These quality control requirements also apply to the Standard Methods, ASTM Methods, and other methods cited.
\8\ ``Organochlorine Pesticides and PCBs in Wastewater Using Empore\TM\ Disk'', 3M Corporation, Revised 10/28/94.
\9\ USGS Method 0-3106-93 from ``Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Triazine and Other Nitrogen-containing Compounds by Gas
Chromatography with Nitrogen Phosphorus Detectors'' U.S. Geological Survey Open File Report 94-37.
[[Page 44]]
Table IE--List of Approved Radiologic Test Test Procedures
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Reference (method number or page)
--------------------------------------------------------------------------------------------------------------------------------------
Parameter and units Method Standard Methods 18th,
EPA \1\ 19th, 20th Ed. Standard Methods Online ASTM USGS \2\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Alpha-Total, pCi per liter..... Proportional or 900.0................ 7110 B.................... 7110 B-00................. D1943-90, 96.............. pp. 75 and 78 \3\
scintillation
counter.
2. Alpha-Counting error, pCi per Proportional or Appendix B........... 7110 B.................... 7110 B-00................. D1943-90, 96.............. p. 79
liter. scintillation
counter.
3. Beta-Total, pCi per liter...... Proportional counter. 900.0................ 7110 B.................... 7110 B-00................. D1890-90, 96.............. pp. 75 and 78 \3\
4. Beta-Counting error, pCi....... Proportional counter. Appendix B........... 7110 B.................... 7110 B-00................. D1890-90, 96.............. p. 79
5. (a) Radium Total pCi per liter. Proportional counter. 903.0................ 7500-Ra B................. 7500-Ra B-01.............. D2460-90, 97.............. ..........................
(b) Ra, pCi per liter.............
Scintillation counter 903.1................ 7500-Ra C................. 7500-Ra C-01.............. D3454-91, 97.............. p. 81
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Prescribed Procedures for Measurement of Radioactivity in Drinking Water, EPA-600/4-80-032 (1980), U.S. Environmental Protection Agency, August 1980.
\2\ Fishman, M. J. and Brown, Eugene, ``Selected Methods of the U.S. Geological Survey of Analysis of Wastewaters,'' U.S. Geological Survey, Open-File Report 76-177 (1976).
\3\ The method found on p. 75 measures only the dissolved portion while the method on p. 78 measures only the suspended portion. Therefore, the two results must be added to obtain the
``total.''
[[Page 45]]
Table IF--List of Approved Methods for Pharmaceutical Pollutants
----------------------------------------------------------------------------------------------------------------
Pharmaceuticals pollutants CAS registry No. Analytical method number
----------------------------------------------------------------------------------------------------------------
acetonitrile................... 75-05-8............................ 1666/1671/D3371/D3695.
n-amyl acetate................. 628-63-7........................... 1666/D3695.
n-amyl alcohol................. 71-41-0............................ 1666/D3695
benzene........................ 71-43-2............................ D4763/D3695/502.2/524.2.
n-butyl-acetate................ 123-86-4........................... 1666/D3695.
tert-butyl alcohol............. 75-65-0............................ 1666.
chlorobenzene.................. 108-90-7........................... 502.2/524.2.
chloroform..................... 67-66-3............................ 502.2/524.2/551.
o-dichlorobenzene.............. 95-50-1............................ 1625C/502.2/524.2.
1,2-dichloroethane............. 107-06-2........................... D3695/502.2/524.2.
diethylamine................... 109-89-7........................... 1666/1671.
dimethyl sulfoxide............. 67-68-5............................ 1666/1671.
ethanol........................ 64-17-5............................ 1666/1671/D3695.
ethyl acetate.................. 141-78-6........................... 1666/D3695.
n-heptane...................... 142-82-5........................... 1666/D3695.
n-hexane....................... 110-54-3........................... 1666/D3695.
isobutyraldehyde............... 78-84-2............................ 1666/1667.
isopropanol.................... 67-63-0............................ 1666/D3695.
isopropyl acetate.............. 108-21-4........................... 1666/D3695.
isopropyl ether................ 108-20-3........................... 1666/D3695.
methanol....................... 67-56-1............................ 1666/1671/D3695.
Methyl Cellosolve [Delta]...... 109-86-4........................... 1666/1671
methylene chloride............. 75-09-2............................ 502.2/524.2
methyl formate................. 107-31-3........................... 1666.
4-methyl-2-pentanone (MIBK).... 108-10-1........................... 1624C/1666/D3695/D4763/524.2.
phenol......................... 108-95-2........................... D4763.
n-propanol..................... 71-23-8............................ 1666/1671/D3695.
2-propanone (acetone).......... 67-64-1............................ D3695/D4763/524.2.
tetrahydrofuran................ 109-99-9........................... 1666/524.2.
toluene........................ 108-88-3........................... D3695/D4763/502.2/524.2.
triethlyamine.................. 121-44-8........................... 1666/1671.
xylenes........................ (Note 1)........................... 1624C/1666.
----------------------------------------------------------------------------------------------------------------
Table 1F note:
1. 1624C: m-xylene 108-38-3, o,p-xylene E-14095 (Not a CAS number; this is the number provided in the
Environmental Monitoring Methods Index (EMMI) database.); 1666: m,p-xylene 136777-61-2, o-xylene 95-47-6.
Table IG--Test Methods for Pesticide Active Ingredients
----------------------------------------------------------------------------------------------------------------
EPA Survey Code Pesticide name CAS No. EPA Analytical Method No.(s)
----------------------------------------------------------------------------------------------------------------
8.................. Triadimefon.............. 43121-43-3 507/633/525.1/1656
12................. Dichlorvos............... 62-73-7 1657/507/622/525.1
16................. 2,4-D; 2,4-D Salts and 94-75-7 1658/515.1/615/515.2/555
Esters [2,4-Dichloro-
phenoxyacetic acid].
17................. 2,4-DB; 2,4-DB Salts and 94-82-6 1658/515.1/615/515.2/555
Esters [2,4-
Dichlorophenoxybutyric
acid].
22................. Mevinphos................ 7786-34-7 1657/507/622/525.1
25................. Cyanazine................ 21725-46-2 629/507
26................. Propachlor............... 1918-16-7 1656/508/608.1/525.1
27................. MCPA; MCPA Salts and 94-74-6 1658/615/555
Esters [2-Methyl-4-
chlorophenoxyacetic
acid].
30................. Dichlorprop; Dichlorprop 120-36-5 1658/515.1/615/515.2/555
Salts and Esters [2-(2,4-
Dichlorophenoxy)
propionic acid].
31................. MCPP; MCPP Salts and 93-65-2 1658/615/555
Esters [2-(2-Methyl-4-
chlorophenoxy) propionic
acid].
35................. TCMTB [2- 21564-17-0 637
(Thiocyanomethylthio)
benzo-thiazole].
39................. Pronamide................ 23950-58-5 525.1/507/633.1
41................. Propanil................. 709-98-8 632.1/1656
45................. Metribuzin............... 21087-64-9 507/633/525.1/1656
52................. Acephate................. 30560-19-1 1656/1657
[[Page 46]]
53................. Acifluorfen.............. 50594-66-6 515.1/515.2/555
54................. Alachlor................. 15972-60-8 505/507/645/525.1/1656
55................. Aldicarb................. 116-06-3 531.1
58................. Ametryn.................. 834-12-8 507/619/525.1
60................. Atrazine................. 1912-24-9 505/507/619/525.1/1656
62................. Benomyl.................. 17804-35-2 631
68................. Bromacil; Bromacil Salts 314-40-9 507/633/525.1/1656
and Esters.
69................. Bromoxynil............... 1689-84-5 1625/1661
69................. Bromoxynil octanoate..... 1689-99-2 1656
70................. Butachlor................ 23184-66-9 507/645/525.1/1656
73................. Captafol................. 2425-06-1 1656
75................. Carbaryl [Sevin]......... 63-25-2 531.1/632/553
76................. Carbofuran............... 1563-66-2 531.1/632
80................. Chloroneb................ 2675-77-6 1656/508/608.1/525.1
82................. Chlorothalonil........... 1897-45-6 508/608.2/525.1/1656
84................. Stirofos................. 961-11-5 1657/507/622/525.1
86................. Chlorpyrifos............. 2921-88-2 1657/508/622
90................. Fenvalerate.............. 51630-58-1 1660
103................ Diazinon................. 333-41-5 1657/507/614/622/525.1
107................ Parathion methyl......... 298-00-0 1657/614/622
110................ DCPA [Dimethyl 2,3,5,6- 1861-32-1 508/608.2/525.1/515.1/515.2/1656
tetrachloro-
terephthalate].
112................ Dinoseb.................. 88-85-7 1658/515.1/615/515.2/555
113................ Dioxathion............... 78-34-2 1657/614.1
118................ Nabonate [Disodium 138-93-2 630.1
cyanodithio-
imidocarbonate].
119................ Diuron................... 330-54-1 632/553
123................ Endothall................ 145-73-3 548/548.1
124................ Endrin................... 72-20-8 1656/505/508/608/617/525.1
125................ Ethalfluralin............ 55283-68-6 1656/627 See footnote 1
126................ Ethion................... 563-12-2 1657/614/614.1
127................ Ethoprop................. 13194-48-4 1657/507/622/525.1
132................ Fenarimol................ 60168-88-9 507/633.1/525.1/1656
133................ Fenthion................. 55-38-9 1657/622
138................ Glyphosate 1071-83-6 547
[N(Phosphonomethyl)
glycine].
140................ Heptachlor............... 76-44-8 1656/505/508/608/617/525.1
144................ Isopropalin.............. 33820-53-0 1656/627
148................ Linuron.................. 330-55-2 553/632
150................ Malathion................ 121-75-5 1657/614
154................ Methamidophos............ 10265-92-6 1657
156................ Methomyl................. 16752-77-5 531.1/632
158................ Methoxychlor............. 72-43-5 1656/505/508/608.2/617/525.1
172................ Nabam.................... 142-59-6 630/630.1
173................ Naled.................... 300-76-5 1657/622
175................ Norflurazon.............. 27314-13-2 507/645/525.1/1656
178................ Benfluralin.............. 1861-40-1 11656/1627
182................ Fensulfothion............ 115-90-2 1657/622
183................ Disulfoton............... 298-04-4 1657/507/614/622/525.1
185................ Phosmet.................. 732-11-6 1657/622.1
186................ Azinphos Methyl.......... 86-50-0 1657/614/622
192................ Organo-tin pesticides.... 12379-54-3 Ind-01/200.7/200.9
197................ Bolstar.................. 35400-43-2 1657/622
203................ Parathion................ 56-38-2 1657/614
204................ Pendimethalin............ 40487-42-1 1656
205................ Pentachloronitrobenzene.. 82-68-8 1656/608.1/617
206................ Pentachlorophenol........ 87-86-5 625/1625/515.2/555/515.1/ 525.1
208................ Permethrin............... 52645-53-1 608.2/508/525.1/1656/1660
212................ Phorate.................. 298-02-2 1657/622
218................ Busan 85 [Potassium 128-03-0 630/630.1
dimethyldithiocarbamate].
[[Page 47]]
219................ Busan 40 [Potassium N- 51026-28-9 630/630.1
hydroxymethyl-N-
methyldithiocarbamate].
220................ KN Methyl [Potassium N- 137-41-7 630/630.1
methyl-dithiocarbamate].
223................ Prometon................. 1610-18-0 507/619/525.1
224................ Prometryn................ 7287-19-6 507/619/525.1
226................ Propazine................ 139-40-2 507/619/525.1/1656
230................ Pyrethrin I.............. 121-21-1 1660
232................ Pyrethrin II............. 121-29-9 1660
236................ DEF [S,S,S-Tributyl 78-48-8 1657
phosphorotrithioate].
239................ Simazine................. 122-34-9 505/507/619/525.1/1656
241................ Carbam-S [Sodium 128-04-1 630/630.1
dimethyldithiocarbanate].
243................ Vapam [Sodium 137-42-8 630/630.1
methyldithiocarbamate].
252................ Tebuthiuron.............. 34014-18-1 507/525.1
254................ Terbacil................. 5902-51-2 507/633/525.1/1656
255................ Terbufos................. 13071-79-9 1657/507/614.1/525.1
256................ Terbuthylazine........... 5915-41-3 619/1656
257................ Terbutryn................ 886-50-0 507/619/525.1
259................ Dazomet.................. 533-74-4 630/630.1/1659
262................ Toxaphene................ 8001-35-2 1656/505/508/608/617/525.1
263................ Merphos [Tributyl 150-50-5 1657/507/525.1/622
phosphorotrithioate].
264................ Trifluralin.............. 1582-09-8 1656/508/617/627/525.1
268................ Ziram [Zinc 137-30-4 630/630.1
dimethyldithiocarbamate].
----------------------------------------------------------------------------------------------------------------
\1\ Monitor and report as total Trifluralin.
[[Page 48]]
Table IH--List of Approved Microbiological Methods for Ambient Water
--------------------------------------------------------------------------------------------------------------------------------------------------------
Standard methods
Parameter and units Method \1\ EPA 18th, 19th, 20th Standard methods AOAC, ASTM, USGS Other
Ed. online
--------------------------------------------------------------------------------------------------------------------------------------------------------
Bacteria:
1. E. coli, number per 100 MPN \6,8,14\ .................. 9221 B.1/9221 F 9221 B.1-99/9221 F
mL. multiple tube, \11,13\. \11,13\.
Multiple tube/ .................. 9223 B \12\....... 9223 B-97 \12\.... 991.15 \10\....... Colilert[reg]
multiple well, \12,16\ Colilert-
18[reg]
\12,15,16\.
MF \2,5,6,7,8\ two 1103.1 \19\....... 9222 B/9222 G 9222 B-97/9222 G D5392-93 \9\......
step, or \18\, 9213 D. \18\.
Single step....... 1603 \20\, 1604 .................. .................. .................. mColiBlue-24[reg]
\21\. \17\.
2. Enterococci, number per MPN \6,8\ multiple .................. 9230 B............ 9230 B-93.........
100 mL. tube,
Multiple tube/ .................. .................. .................. D6503-99 \9\...... Enterolert[reg]
multiple well. \12,22\.
MF \2,5,6,7,8\ two 1106.1 \23\....... 9230 C............ 9230 C-93......... D5259-92 \9\......
step.
Single step, or... 1600 \24\.........
Plate count....... p. 143 \3\........
Protozoa:
3. Cryptosporidium.......... Filtration/IMS/FA. 1622 \25,\1623
\26\.
4. Giardia.................. Filtration/IMS/FA. 1623 \26\.........
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ The method must be specified when results are reported.
\2\ A 0.45 [mu]m membrane filter (MF) or other pore size certified by the manufacturer to fully retain organisms to be cultivated and to be free of
extractables which could interfere with their growth.
\3\ USEPA. 1978. Microbiological Methods for Monitoring the Environment, Water, and Wastes. Environmental Monitoring and Support Laboratory, U.S.
Environmental Protection Agency, Cincinnati, OH. EPA/600/8-78/017.
\4\ [Reserved]
\5\ Because the MF technique usually yields low and variable recovery from chlorinated wastewaters, the Most Probable Number method will be required to
resolve any controversies.
\6\ Tests must be conducted to provide organism enumeration (density). Select the appropriate configuration of tubes/filtrations and dilutions/volumes
to account for the quality, character, consistency, and anticipated organism density of the water sample.
\7\ When the MF method has not been used previously to test waters with high turbidity, large number of noncoliform bacteria, or samples that may
contain organisms stressed by chlorine, a parallel test should be conducted with a multiple-tube technique to demonstrate applicability and
comparability of results.
\8\ To assess the comparability of results obtained with individual methods, it is suggested that side-by-side tests be conducted across seasons of the
year with the water samples routinely tested in accordance with the most current Standard Methods for the Examination of Water and Wastewater or EPA
alternate test procedure (ATP) guidelines.
\9\ ASTM. 2000, 1999, 1996. Annual Book of ASTM Standards--Water and Environmental Technology. Section 11.02. ASTM International. 100 Barr Harbor Drive,
West Conshohocken, PA 19428.
\10\ AOAC. 1995. Official Methods of Analysis of AOAC International, 16th Edition, Volume I, Chapter 17. Association of Official Analytical Chemists
International. 481 North Frederick Avenue, Suite 500, Gaithersburg, MD 20877-2417.
\11\ The multiple-tube fermentation test is used in 9221B.1. Lactose broth may be used in lieu of lauryl tryptose broth (LTB), if at least 25 parallel
tests are conducted between this broth and LTB using the water samples normally tested, and this comparison demonstrates that the false-positive rate
and false-negative rate for total coliform using lactose broth is less than 10 percent. No requirement exists to run the completed phase on 10 percent
of all total coliform-positive tubes on a seasonal basis.
\12\ These tests are collectively known as defined enzyme substrate tests, where, for example, a substrate is used to detect the enzyme [beta]-
glucuronidase produced by E. coli.
\13\ After prior enrichment in a presumptive medium for total coliform using 9221B.1, all presumptive tubes or bottles showing any amount of gas, growth
or acidity within 48 h 3 h of incubation shall be submitted to 9221F. Commercially available EC-MUG media or EC media
supplemented in the laboratory with 50 [mu]g/mL of MUG may be used.
\14\ Samples shall be enumerated by the multiple-tube or multiple-well procedure. Using multiple-tube procedures, employ an appropriate tube and
dilution configuration of the sample as needed and report the Most Probable Number (MPN). Samples tested with Colilert[reg] may be enumerated with the
multiple-well procedures, Quanti-Tray[reg] or Quanti-Tray[reg] 2000, and the MPN calculated from the table provided by the manufacturer.
\15\ Colilert-18[reg] is an optimized formulation of the Colilert[reg] for the determination of total coliforms and E. coli that provides results within
18 h of incubation at 35 [deg]C rather than the 24 h required for the Colilert[reg] test and is recommended for marine water samples.
\16\ Descriptions of the Colilert[reg], Colilert-18[reg], Quanti-Tray[reg], and Quanti-Tray[reg]/2000 may be obtained from IDEXX Laboratories, Inc., 1
IDEXX Drive, Westbrook, ME 04092.
\17\ A description of the mColiBlue24[reg] test, Total Coliforms and E. coli, is available from Hach Company, 100 Dayton Ave., Ames, IA 50010.
\18\ Subject total coliform positive samples determined by 9222B or other membrane filter procedure to 9222G using NA-MUG media.
[[Page 49]]
\19\ USEPA. July 2006. Method 1103.1: Escherichia coli (E. coli) in Water by Membrane Filtration Using membrane-Thermotolerant Escherichia coli Agar
(mTEC). U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-010.
\20\ USEPA. July 2006. Method 1603: Escherichia coli (E. coli) in Water by Membrane Filtration Using Modified membrane-Thermotolerant Escherichia coli
Agar (Modified mTEC). U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-011.
\21\ Preparation and use of MI agar with a standard membrane filter procedure is set forth in the article, Brenner et al. 1993. ``New Medium for the
Simultaneous Detection of Total Coliform and Escherichia coli in Water.'' Appl. Environ. Microbiol. 59:3534-3544 and in USEPA. September 2002.: Method
1604: Total Coliforms and Escherichia coli (E. coli) in Water by Membrane Filtration by Using a Simultaneous Detection Technique (MI Medium). U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA 821-R-02-024.
\22\ A description of the Enterolert[reg] test may be obtained from IDEXX Laboratories, Inc., 1 IDEXX Drive, Westbrook, ME 04092.
\23\ USEPA. July 2006. Method 1106.1: Enterococci in Water by Membrane Filtration Using membrane-Enterococcus-Esculin Iron Agar (mE-EIA). U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-008.
\24\ USEPA. July 2006. Method 1600: Enterococci in Water by Membrane Filtration Using membrane-Enterococcus Indoxyl-[beta]-D-Glucoside Agar (mEI). U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-06-009.
\25\ Method 1622 uses filtration, concentration, immunomagnetic separation of oocysts from captured material, immunofluorescence assay to determine
concentrations, and confirmation through vital dye staining and differential interference contrast microscopy for the detection of Cryptosporidium.
USEPA. 2001. Method 1622: Cryptosporidium in Water by Filtration/IMS/FA. U.S. Environmental Protection Agency, Office of Water, Washington, DC EPA-821-
R-01-026.
\26\ Method 1623 uses filtration, concentration, immunomagnetic separation of oocysts and cysts from captured material, immunofluorescence assay to
determine concentrations, and confirmation through vital dye staining and differential interference contrast microscopy for the simultaneous detection
of Cryptosporidium and Giardia oocysts and cysts. USEPA. 2001. Method 1623. Cryptosporidium and Giardia in Water by Filtration/IMS/FA. U.S.
Environmental Protection Agency, Office of Water, Washington, DC EPA-821-R-01-025.
[[Page 50]]
(b) The full texts of the methods from the following references
which are cited in Tables IA, IB, IC, ID, IE, IF, IG and IH are
incorporated by reference into this regulation and may be obtained from
the source identified. All costs cited are subject to change and must be
verified from the indicated source. The full texts of all the test
procedures cited are available for inspection at the National Archives
and Records Administration (NARA). For information on the availability
of this material at NARA, call 202-741-6030, or go to: http://
www.archives.gov/federal--register/code--of--federal--regulations/ibr--
locations.html.
References, Sources, Costs, and Table Citations:
(1) The full texts of Methods 601-613, 624, 625, 1613, 1624, and
1625 are printed in appendix A of this part 136. The full text for
determining the method detection limit when using the test procedures is
given in appendix B of this part 136. The full text of Method 200.7 is
printed in appendix C of this part 136. Cited in: Table IB, Note 5;
Table IC, Note 2; and Table ID, Note 2.
(2) USEPA. 1978. Microbiological Methods for Monitoring the
Environment, Water, and Wastes. Environmental Monitoring and Support
Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio. EPA/
600/8-78/017. Available at http://www.epa.gov/clariton/srch.htm or from:
National Technical Information Service, 5285 Port Royal Road,
Springfield, Virginia 22161, Pub. No. PB-290329/A.S. Table IA, Note 3;
Table IH, Note 3.
(3) ``Methods for Chemical Analysis of Water and Wastes,'' U.S.
Environmental Protection Agency, EPA-600/4-79-020, March 1979, or
``Methods for Chemical Analysis of Water and Wastes,'' U.S.
Environmental Protection Agency, EPA-600/4-79-020, Revised March 1983.
Available from: ORD Publications, CERI, U.S. Environmental Protection
Agency, Cincinnati, Ohio 45268, Table IB, Note 1.
(4) ``Methods for Benzidine, Chlorinated Organic Compounds,
Pentachlorophenol and Pesticides in Water and Wastewater,'' U.S.
Environmental Protection Agency, 1978. Available from: ORD Publications,
CERI, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268,
Table IC, Note 3; Table D, Note 3.
(5) ``Prescribed Procedures for Measurement of Radioactivity in
Drinking Water,'' U.S. Environmental Protection Agency, EPA-600/4-80-
032, 1980. Available from: ORD Publications, CERI, U.S. Environmental
Protection Agency, Cincinnati, Ohio 45268, Table IE, Note 1.
(6) American Public Health Association. 1992, 1995, and 1998.
Standard Methods for the Examination of Water and Wastewater. 18th,
19th, and 20th Edition (respectively). Available from: American Public
Health Association, 1015 15th Street, NW., Washington, DC 20005.
Standard Methods Online is available through the Standard Methods Web
site (http://www.standardmethods.org). Tables IA, IB, IC, ID, IE, and
IH.
(7) Ibid, 15th Edition, 1980. Table IB, Note 30; Table ID.
(8) Ibid, 14th Edition, 1975. Table IB, Notes 17 and 27.
(9) ``Selected Analytical Methods Approved and Cited by the United
States Environmental Protection Agency,'' Supplement to the 15th Edition
of Standard Methods for the Examination of Water and Wastewater, 1981.
Available from: American Public Health Association, 1015 Fifteenth
Street NW., Washington, DC 20036. Cost available from publisher. Table
IB, Note 10; Table IC, Note 6; Table ID, Note 6.
(10) ASTM International. Annual Book of ASTM Standards, Water, and
Environmental Technology, Section 11, Volumes 11.01 and 11.02, 1994,
1996, 1999, Volume 11.02, 2000, and individual standards published after
2000. Available from: ASTM International, 100 Barr Harbor Drive, P.O.
Box C700, West Conshohocken, PA 19428-2959, or http://www.astm.org.
Tables IA, IB, IC, ID, IE, and IH.
(11) USGS. 1989. U.S. Geological Survey Techniques of Water-
Resources Investigations, Book 5, Laboratory Analysis, Chapter A4,
Methods for Collection and Analysis of Aquatic Biological and
Microbiological Samples, U.S. Geological Survey, U.S. Department of the
Interior, Reston, Virginia. Available
[[Page 51]]
from USGS Books and Open-File Reports Section, Federal Center, Box
25425, Denver, Colorado 80225. Table IA, Note 5; Table IH.
(12) ``Methods for Determination of Inorganic Substances in Water
and Fluvial Sediments,'' by M.J. Fishman and Linda C. Friedman,
Techniques of Water-Resources Investigations of the U.S. Geological
Survey, Book 5 Chapter A1 (1989). Available from: U.S. Geological
Survey, Denver Federal Center, Box 25425, Denver, CO 80225. Cost:
$108.75 (subject to change). Table IB, Note 2.
(13) ``Methods for Determination of Inorganic Substances in Water
and Fluvial Sediments,'' N.W. Skougstad and others, editors. Techniques
of Water-Resources Investigations of the U.S. Geological Survey, Book 5,
Chapter A1 (1979). Available from: U.S. Geological Survey, Denver
Federal Center, Box 25425, Denver, CO 80225. Cost: $10.00 (subject to
change), Table IB, Note 8.
(14) ``Methods for the Determination of Organic Substances in Water
and Fluvial Sediments,'' Wershaw, R.L., et al, Techniques of Water-
Resources Investigations of the U.S. Geological Survey, Book 5, Chapter
A3 (1987). Available from: U.S. Geological Survey, Denver Federal
Center, Box 25425, Denver, CO 80225. Cost: $0.90 (subject to change).
Table IB, Note 24; Table ID, Note 4.
(15) ``Water Temperature--Influential Factors, Field Measurement and
Data Presentation,'' by H.H. Stevens, Jr., J. Ficke, and G.F. Smoot,
Techniques of Water-Resources Investigations of the U.S. Geological
Survey, Book 1, Chapter D1, 1975. Available from: U.S. Geological
Survey, Denver Federal Center, Box 25425, Denver, CO 80225. Cost: $1.60
(subject to change). Table IB, Note 32.
(16) ``Selected Methods of the U.S. Geological Survey of Analysis of
Wastewaters,'' by M.J. Fishman and Eugene Brown; U.S. Geological Survey
Open File Report 76-77 (1976). Available from: U.S. Geological Survey,
Branch of Distribution, 1200 South Eads Street, Arlington, VA 22202.
Cost: $13.50 (subject to change). Table IE, Note 2.
(17) AOAC-International. Official Methods of Analysis of AOAC-
International, 16th Edition, (1995). Available from: AOAC-International,
481 North Frederick Avenue, Suite 500, Gaithersburg, MD 20877. Table IB,
See footnote 3.
(18) ``American National Standard on Photographic Processing
Effluents,'' April 2, 1975. Available from: American National Standards
Institute, 1430 Broadway, New York, New York 10018. Table IB, Note 9.
(19) ``An Investigation of Improved Procedures for Measurement of
Mill Effluent and Receiving Water Color,'' NCASI Technical Bulletin No.
253, December 1971. Available from: National Council of the Paper
Industry for Air and Stream Improvements, Inc., 260 Madison Avenue, New
York, NY 10016. Cost available from publisher. Table IB, Note 18.
(20) Ammonia, Automated Electrode Method, Industrial Method Number
379-75WE, dated February 19, 1976. Technicon Auto Analyzer II. Method
and price available from Technicon Industrial Systems, Tarrytown, New
York 10591. Table IB, Note 7.
(21) Chemical Oxygen Demand, Method 8000, Hach Handbook of Water
Analysis, 1979. Method price available from Hach Chemical Company, P.O.
Box 389, Loveland, Colorado 80537. Table IB, Note 14.
(22) OIC Chemical Oxygen Demand Method, 1978. Method and price
available from Oceanography International Corporation, 512 West Loop,
P.O. Box 2980, College Station, Texas 77840. Table IB, Note 13.
(23) ORION Research Instruction Manual, Residual Chlorine Electrode
Model 97-70, 1977. Method and price available from ORION Research
Incorporation, 840 Memorial Drive, Cambridge, Massachusetts 02138. Table
IB, Note 16.
(24) Bicinchoninate Method for Copper. Method 8506, Hach Handbook of
Water Analysis, 1979, Method and price available from Hach Chemical
Company, P.O. Box 300, Loveland, Colorado 80537. Table IB, Note 19.
(25) Hydrogen Ion (pH) Automated Electrode Method, Industrial Method
Number 378-75WA. October 1976. Bran & Luebbe (Technicon) Auto Analyzer
II. Method and price available from Bran & Luebbe Analyzing
Technologies, Inc. Elmsford, N.Y. 10523. Table IB, Note 21.
(26) 1,10-Phenanthroline Method using FerroVer Iron Reagent for
Water,
[[Page 52]]
Hach Method 8008, 1980. Method and price available from Hach Chemical
Company, P.O. Box 389 Loveland, Colorado 80537. Table IB, Note 22.
(27) Periodate Oxidation Method for Manganese, Method 8034, Hach
Handbook for Water Analysis, 1979. Method and price available from Hach
Chemical Company, P.O. Box 389, Loveland, Colorado 80537. Table IB, Note
23.
(28) Nitrogen, Nitrite--Low Range, Diazotization Method for Water
and Wastewater, Hach Method 8507, 1979. Method and price available from
Hach Chemical Company, P.O. Box 389, Loveland, Colorado 80537. Table IB,
Note 25.
(29) Zincon Method for Zinc, Method 8009. Hach Handbook for Water
Analysis, 1979. Method and price available from Hach Chemical Company,
P.O. Box 389, Loveland, Colorado 80537. Table IB, Note 33.
(30) ``Direct Determination of Elemental Phosphorus by Gas-Liquid
Chromatography,'' by R.F. Addison and R.G. Ackman, Journal of
Chromatography, Volume 47, No. 3, pp. 421-426, 1970. Available in most
public libraries. Back volumes of the Journal of Chromatography are
available from Elsevier/North-Holland, Inc., Journal Information Centre,
52 Vanderbilt Avenue, New York, NY 10164. Cost available from publisher.
Table IB, Note 28.
(31) ``Direct Current Plasma (DCP) Optical Emission Spectrometric
Method for Trace Elemental Analysis of Water and Wastes'', Method AES
0029, 1986-Revised 1991, Fison Instruments, Inc., 32 Commerce Center,
Cherry Hill Drive, Danvers, MA 01923. Table B, Note 34.
(32) ``Closed Vessel Microwave Digestion of Wastewater Samples for
Determination of Metals, CEM Corporation, P.O. Box 200, Matthews, North
Carolina 28106-0200, April 16, 1992. Available from the CEM Corporation.
Table IB, Note 36.
(33) ``Organochlorine Pesticides and PCBs in Wastewater Using Empore
\TM\ Disk'' Test Method 3M 0222, Revised 10/28/94. 3M Corporation, 3M
Center Building 220-9E-10, St. Paul, MN 55144-1000. Method available
from 3M Corporation. Table IC, Note 8 and Table ID, Note 8.
(34) USEPA. October 2002. Methods for Measuring the Acute Toxicity
of Effluents and Receiving Waters to Freshwater and Marine Organisms.
Fifth Edition. U.S. Environmental Protection Agency, Office of Water,
Washington, DC EPA 821-R-02-012. Available at http://www.epa.gov/
epahome/index/sources.htm or from National Technical Information
Service, 5285 Port Royal Road, Springfield, Virginia 22161, Pub. No.
PB2002-108488. Table IA, Note 25.
(35) ``Nitrogen, Total Kjeldahl, Method PAI-DK01 (Block Digestion,
Steam Distillation, Titrimetric Detection)'', revised 12/22/94.
Available from Perstorp Analytical Corporation, 9445 SW Ridder Rd.,
Suite 310, P.O. Box 648, Wilsonville, OK 97070. Table IB, Note 39.
(36) ``Nitrogen, Total Kjeldahl, Method PAI-DK02 (Block Digestion,
Steam Distillation, Colorimetric Detection)'', revised 12/22/94.
Available from Perstorp Analytical Corporation, 9445 SW Ridder Rd.,
Suite 310, P.O. Box 648, Wilsonville, OK 97070. Table IB, Note 40.
(37) ``Nitrogen, Total Kjeldahl, Method PAI-DK03 (Block Digestion,
Automated FIA Gas Diffusion)'', revised 12/22/94. Available from
Perstorp Analytical Corporation, 9445 SW Ridder Rd., Suite 310, P.O. Box
648, Wilsonville, OK 97070. Table IB, Note 41.
(38) USEPA. October 2002. Short-Term Methods for Measuring the
Chronic Toxicity of Effluents and Receiving Waters to Freshwater
Organisms. Fourth Edition. U.S. Environmental Protection Agency, Office
of Water, Washington, DC EPA 821-R-02-013. Available at http://
www.epa.gov/epahome/index/sources.htm or from National Technical
Information Service, 5285 Port Royal Road, Springfield, Virginia 22161,
Pub. No. PB2002-108489. Table IA, Note 26.
(39) USEPA. October 2002. Short-Term Methods for Measuring the
Chronic Toxicity of Effluents and Receiving Waters to Marine and
Estuarine Organisms. Third Edition. U.S. Environmental Protection
Agency, Office of Water, Washington, DC EPA 821-R-02-014. Available at
http://www.epa.gov/epahome/index/sources.htm or from National Technical
Information Service, 5285 Port Royal Road, Springfield, Virginia 22161,
Pub. No. PB2002-108490. Table IA, Note 27.
[[Page 53]]
(40) EPA Methods 1666, 1667, and 1671 listed in the table above are
published in the compendium titled Analytical Methods for the
Determination of Pollutants in Pharmaceutical Manufacturing Industry
Wastewaters (EPA 821-B-98-016). EPA Methods 502.2 and 524.2 have been
incorporated by reference into 40 CFR 141.24 and are in Methods for the
Determination of Organic Compounds in Drinking Water, EPA-600/4-88-039,
December 1988, Revised, July 1991, and Methods for the Determination of
Organic Compounds in Drinking Water-Supplement II, EPA-600/R-92-129,
August 1992, respectively. These EPA test method compendia are available
from the National Technical Information Service, NTIS PB91-231480 and
PB92-207703, U.S. Department of Commerce, 5285 Port Royal Road,
Springfield, Virginia 22161. The toll-free number is 800-553-6847. ASTM
test methods D3371, D3695, and D4763 are available from the American
Society for Testing and Materials, 100 Barr Harbor Drive, West
Conshohocken, PA 19428-2959.
(41) USEPA. 2002. Method 1631, Revision E, ``Mercury in Water by
Oxidation, Purge and Trap, and Cold Vapor Atomic Fluorescence
Spectrometry.'' September 2002. Office of Water, U.S. Environmental
Protection Agency (EPA-821-R-02-019). Available from: National Technical
Information Service, 5285 Port Royal Road, Springfield, Virginia 22161.
Publication No. PB2002-108220. Cost: $25.50 (subject to change).
(42) [Reserved]
(43) Method OIA-1677, Available Cyanide by Flow Injection, Ligand
Exchange, and Amperometry. August 1999. ALPKEM, OI Analytical, Box 648,
Wilsonville, Oregon 97070 (EPA-821-R-99-013). Available from: National
Technical Information Service, 5285 Port Royal Road, Springfield,
Virginia 22161. Publication No. PB99-132011. Cost: $22.50. Table IB,
Note 44.
(44) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory Determination of Ammonium Plus Organic Nitrogen
by a Kjeldahl Digestion Method and an Automated Photometric Finish that
Includes Digest Cleanup by Gas Diffusion'', Open File Report (OFR) 00-
170. Available from: U.S. Geological Survey, Denver Federal Center, Box
25425, Denver, CO 80225. Table IB, Note 45.
(45) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Chromium in Water by Graphite
Furnace Atomic Absorption Spectrophotometry'', Open File Report (OFR)
93-449. Available from: U.S. Geological Survey, Denver Federal Center,
Box 25425, Denver, CO 80225. Table IB, Note 46.
(46) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Molybdenum in Water by
Graphite Furnace Atomic Absorption Spectrophotometry'', Open File Report
(OFR) 97-198. Available from: U.S. Geological Survey, Denver Federal
Center, Box 25425, Denver, CO 80225. Table IB, Note 47.
(47) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Total Phosphorus by Kjeldahl
Digestion Method and an Automated Colorimetric Finish That Includes
Dialysis'' Open File Report (OFR) 92-146. Available from: U.S.
Geological Survey, Denver Federal Center, Box 25425, Denver, CO 80225.
Table IB, Note 48.
(48) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Arsenic and Selenium in Water
and Sediment by Graphite Furnace--Atomic Absorption Spectrometry'' Open
File Report (OFR) 98-639. Table IB, Note 49.
(49) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Elements in Whole-Water
Digests Using Inductively Coupled Plasma-Optical Emission Spectrometry
and Inductively Coupled Plasma-Mass Spectrometry'' , Open File Report
(OFR) 98-165. Available from: U.S. Geological Survey, Denver Federal
Center, Box 25425, Denver, CO 80225. Table IB, Note 50.
(50) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Triazine and Other Nitrogen-
containing Compounds by Gas Chromatography with Nitrogen Phosphorus
Detectors'' U.S.Geological Survey Open File Report 94-37. Available
from: U.S.
[[Page 54]]
Geological Survey, Denver Federal Center, Box 25425, Denver, CO 80225.
Table ID, Note 9.
(51) ``Methods of Analysis by the U.S. Geological Survey National
Water Quality Laboratory--Determination of Inorganic and Organic
Constituents in Water and Fluvial Sediments'', Open File Report (OFR)
93-125. Available from: U.S. Geological Survey, Denver Federal Center,
Box 25425, Denver, CO 80225. Table IB, Note 51; Table IC, Note 9.
(52) IDEXX Laboratories, Inc. 2002. Description of
Colilert[reg], Colilert-18[reg], Quanti-
Tray[reg], Quanti-Tray[reg]/2000,
Enterolert[reg] methods are available from IDEXX
Laboratories, Inc., One Idexx Drive, Westbrook, Maine 04092. Table IA,
Notes 17 and 23; Table IH, Notes 16 and 22.
(53) Hach Company, Inc. Revision 2, 1999. Description of m-
ColiBlue24[reg] Method, Total Coliforms and E. coli, is
available from Hach Company, 100 Dayton Ave, Ames IA 50010. Table IA,
Note 18; Table IH, Note 17.
(54) USEPA. July 2006. Method 1103.1: Escherichia coli (E. coli) in
Water by Membrane Filtration Using membrane-Thermotolerant Escherichia
coli Agar (mTEC). U.S. Environmental Protection Agency, Office of Water,
Washington DC EPA-621-R-06-010. Available at http://www.epa.gov/
waterscience/methods/. Table IH, Note 19.
(55) USEPA. July 2006. Method 1106.1: Enterococci in Water by
Membrane Filtration Using membrane-Enterococcus-Esculin Iron Agar (mE-
EIA). U.S. Environmental Protection Agency, Office of Water, Washington
DC EPA-621-R-06-008. Available at http://www.epa.gov/waterscience/
methods/. Table IH, Note 23
(56) USEPA. July 2006. Method 1603: Escherichia coli (E. coli) in
Water by Membrane Filtration Using Modified membrane-Thermotolerant
Escherichia coli Agar (Modified mTEC). U.S. Environmental Protection
Agency, Office of Water, Washington DC EPA-821-R-06-011. Available at
http://www.epa.gov/waterscience/methods/. Table IH, Note 19; Table IH,
Note 20.
(57) Brenner et al. 1993. New Medium for the Simultaneous Detection
of Total Coliforms and Escherichia coli in Water. Appl. Environ.
Microbiol. 59:3534-3544. Available from the American Society for
Microbiology, 1752 N Street NW., Washington DC 20036. Table IH, Note 21.
(58) USEPA. September 2002. Method 1604: Total Coliforms and
Escherichia coli (E. coli) in Water by Membrane Filtration Using a
Simultaneous Detection Technique (MI Medium). U.S. Environmental
Protection Agency, Office of Water, Washington DC EPA-821-R-02-024.
Available at http://www.epa.gov/waterscience/methods/. Table IH, Note
20.
(59) USEPA. July 2006. Method 1600: Enterococci in Water by Membrane
Filtration Using membrane-Enterococcus Indoxyl-[beta]-D-Glucoside Agar
(mEI). U.S. Environmental Protection Agency, Office of Water, Washington
DC EPA-821-R-06-009. Available at http://www.epa.gov/waterscience/
methods/. Table IA, Note 24; Table IH, Note 24.
(60) USEPA. April 2001. Method 1622: Cryptosporidium in Water by
Filtration/IMS/FA. U.S. Environmental Protection Agency, Office of
Water, Washington DC EPA-821-R-01-026. Available at http://www.epa.gov/
waterscience/methods/. Table IH, Note 25.
(61) USEPA. April 2001. Method 1623: Cryptosporidium and Giardia in
Water by Filtration/IMS/FA. U.S. Environmental Protection Agency, Office
of Water, Washington DC. EPA-821-R-01-025. Available at http://
www.epa.gov/waterscience/methods/. Table IH, Note 26.
(62) AOAC. 1995. Official Methods of Analysis of AOAC International,
16th Edition, Volume I, Chapter 17. AOAC International, 481 North
Frederick Avenue, Suite 500, Gaithersburg, Maryland 20877-2417. Table
IA, Note 11; Table IH.
(63) Waters Corporation. Method D6508, Rev. 2, ``Test Method for
Determination of Dissolved Inorganic Anions in Aqueous Matrices Using
Capillary Ion Electrophoresis and Chromate Electrolyte,'' available from
Waters Corp, 34 Maple Street, Milford, MA 01757, Telephone: 508/482-
2131, Fax: 508/482-3625, Table IB, See footnote 54.
(64) Kelada-01, ``Kelada Automated Test Methods for Total Cyanide,
Acid Dissociable Cyanide, and Thiocyanate,'' EPA 821-B-01-009 Revision
1.2, August 2001 is available from
[[Page 55]]
National Technical Information Service (NTIS), 5285 Port Royal Road,
Springfield, VA 22161 [Order Number PB 2001-108275]. Telephone: 800-553-
6847. Table IB, See footnote 55.
(65) QuikChem Method 10-204-00-1-X, ``Digestion and Distillation of
Total Cyanide in Drinking and Wastewaters using MICRO DIST and
Determination of Cyanide by Flow Injection Analysis'' Revision 2.2,
March 2005 is available from Lachat Instruments 6645 W. Mill Road,
Milwaukee, WI 53218, Telephone: 414-358-4200. Table IB, See footnote 56.
(66) ``Methods for the Determination of Metals in Environmental
Samples,'' Supplement I, National Exposure Risk Laboratory-Cincinnati
(NERL-CI), EPA/600/R-94/111, May 1994; and ``Methods for the
Determination of Inorganic Substances in Environmental Samples,'' NERL-
CI, EPA/600/R-93/100, August, 1993 are available from National Technical
Information Service (NTIS), 5285 Port Royal Road, Springfield, VA 22161.
Telephone: 800-553-6847. Table IB.
(67) ``Determination of Inorganic Ions in Drinking Water by Ion
Chromatography,'' Rev. 1.0, 1997 is available from from http://
www.epa.gov/safetwater/methods/met300.pdf. Table IB.
(68) Table IG Methods are available in ``Methods For The
Determination of Nonconventional Pesticides In Municipal and Industrial
Wastewater, Volume I,'' EPA 821-R-93-010A, August 1993 Revision I, and
``Methods For The Determination of Nonconventional Pesticides In
Municipal and Industrial Wastewater, Volume II,'' EPA 821-R-93-010B
(August 1993) are available from National Technical Information Service
(NTIS), 5285 Port Royal Road, Springfield, VA 22161. Telephone: 800-553-
6847.
(69) Method 245.7, Rev. 2.0, ``Mercury in Water by Cold Vapor Atomic
Fluorescence Spectrometry,'' February 2005, EPA-821-R-05-001, available
from the U.S. EPA Sample Control Center (operated by CSC), 6101
Stevenson Avenue, Alexandria, VA 22304, Telephone: 703-461-8056. Table
IB, See footnote 59.
(70) USEPA. July 2006. Method 1680: Fecal Coliforms in Sewage Sludge
(Biosolids) by Multiple-Tube Fermentation using Lauryl Tryptose Broth
(LTB) and EC Medium. U.S. Environmental Protection Agency, Office of
Water, Washington DC. EPA 821-R-06-012. Available at http://www.epa.gov/
waterscience/methods/.
(71) USEPA. July 2006. Method 1681: Fecal Coliforms in Sewage Sludge
(Biosolids) by Multiple-Tube Fermentation using A-1 Medium. U.S.
Environmental Protection Agency, Office of Water, Washington DC. EPA
821-R-06-013. Available at http://www.epa.gov/waterscience/methods/.
(72) USEPA. July 2006. Method 1682: Salmonella in Sewage Sludge
(Biosolids) by Modified Semisolid Rappaport-Vassiliadis (MSRV) Medium.
U.S. Environmental Protection Agency, Office of Water, Washington DC.
EPA 821-R-06-014. Available at http://www.epa.gov/waterscience/methods/.
(c) Under certain circumstances, the Regional Administrator or the
Director in the Region or State where the discharge will occur may
determine for a particular discharge that additional parameters or
pollutants must be reported. Under such circumstances, additional test
procedures for analysis of pollutants may be specified by the Regional
Administrator, or the Director upon recommendation of the Alternate Test
Procedure Program Coordinator, Washington, DC.
(d) Under certain circumstances, the Administrator may approve
additional alternate test procedures for nationwide use, upon
recommendation by the Alternate Test Procedure Program Coordinator,
Washington, DC.
(e) Sample preservation procedures, container materials, and maximum
allowable holding times for parameters are cited in Tables IA, IB, IC,
ID, IE, IF, IG and IH are prescribed in Table II. Information in the
table takes precedence over information in specific methods or
elsewhere. Any person may apply for a variance from the prescribed
preservation techniques, container materials, and maximum holding times
applicable to samples taken from a specific discharge. Applications for
variances may be made by letters to the Regional Administrator in the
Region in which the discharge will occur. Sufficient data should be
provided to assure such variance does not adversely affect the integrity
of the sample. Such data will be forwarded by
[[Page 56]]
the Regional Administrator, to the Alternate Test Procedure Program
Coordinator, Washington, DC, for technical review and recommendations
for action on the variance application. Upon receipt of the
recommendations from the Alternate Test Procedure Program Coordinator,
the Regional Administrator may grant a variance applicable to the
specific discharge to the applicant. A decision to approve or deny a
variance will be made within 90 days of receipt of the application by
the Regional Administrator.
Table II--Required Containers, Preservation Techniques, and Holding Times
----------------------------------------------------------------------------------------------------------------
Maximum holding time
Parameter No./name Container \1\ Preservation \2,3\ \4\
----------------------------------------------------------------------------------------------------------------
Table IA--Bacterial Tests:
1-5. Coliform, total, fecal, and PA, G.................. Cool, <10 [deg]C, 6 hours.\22,23\
E. coli. 0.0008% Na2S2O3 \5\.
6. Fecal streptococci............ PA, G.................. Cool, <10 [deg]C, 6 hours.\22\
0.0008% Na2S2O3 \5\.
7. Enterococci................... PA, G.................. Cool, <10 [deg]C, 6 hours.\22\
0.0008% Na2S2O3 \5\.
8. Salmonella.................... PA, G.................. Cool, <10 [deg]C, 6 hours.\22\
0.0008% Na2S2O3 \5\.
Table IA--Aquatic Toxicity Tests:
9-11. Toxicity, acute and chronic P, FP, G............... Cool, <=6 [deg]C \16\.. 36 hours.
Table lB--Inorganic Tests:
1. Acidity....................... P, FP, G............... Cool, <=6 [deg]C \18\.. 14 days.
2. Alkalinity.................... P, FP, G............... Cool, <=6 [deg]C \18\.. 14 days.
4. Ammonia....................... P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
9. Biochemical oxygen demand..... P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
10. Boron........................ P, FP, or Quartz....... HNO3 to pH<2........... 6 months.
11. Bromide...................... P, FP, G............... None required.......... 28 days.
14. Biochemical oxygen demand, P, FP G................ Cool, <=6 [deg]C \18\.. 48 hours.
carbonaceous.
15. Chemical oxygen demand....... P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
16. Chloride..................... P, FP, G............... None required.......... 28 days.
17. Chlorine, total residual..... P, G................... None required.......... Analyze within 15
minutes.
21. Color........................ P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
23-24. Cyanide, total or P, FP, G............... Cool, <=6 [deg]C \18\, 14 days.
available (or CATC). NaOH to pH12 \6\, reducing
agent \5\.
25. Fluoride..................... P...................... None required.......... 28 days.
27. Hardness..................... P, FP, G............... HNO3 or H2SO4 to pH<2.. 6 months.
28. Hydrogen ion (pH)............ P, FP, G............... None required.......... Analyze within 15
minutes.
31, 43. Kjeldahl and organic N... P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
Table IB--Metals: \7\
18. Chromium VI.................. P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
pH = 9.3-9.7 \20\.
35. Mercury (CVAA)............... P, FP, G............... HNO3 to pH<2........... 28 days.
35. Mercury (CVAFS).............. FP, G; and FP-lined cap 5 mL/L 12N HCl or 5 mL/ 90 days.\17\
\17\. L BrCl \17\.
3, 5-8, 12, 13, 19, 20, 22, 26, P, FP, G............... HNO3 to pH<2, or at 6 months.
29, 30, 32-34, 36, 37, 45, 47, least 24 hours prior
51, 52, 58-60, 62, 63, 70-72, to analysis \19\.
74, 75.
Metals, except boron, chromium
VI, and mercury.
38. Nitrate...................... P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
39. Nitrate-nitrite.............. P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
40. Nitrite...................... P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
41. Oil and grease............... G...................... Cool to <=6 [deg]C 28 days.
\18\, HCl or H2SO4 to
pH<2.
42. Organic Carbon............... P, FP, G............... Cool to <=6 [deg]C 28 days.
\18\, HCl, H2SO4, or
H3PO4 to pH<2.
44. Orthophosphate............... P, FP, G............... Cool, <=6 [deg]C \18\.. Filter within 15
minutes; Analyze
within 48 hours.
46. Oxygen, Dissolved Probe...... G, Bottle and top...... None required.......... Analyze within 15
minutes.
47. Winkler...................... G, Bottle and top...... Fix on site and store 8 hours.
in dark.
48. Phenols...................... G...................... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
49. Phosphorous (elemental)...... G...................... Cool, <=6 [deg]C \18\.. 48 hours.
50. Phosphorous, total........... P, FP, G............... Cool, <=6 [deg]C \18\, 28 days.
H2SO4 to pH<2.
53. Residue, total............... P, FP, G............... Cool, <=6 [deg]C \18\.. 7 days.
54. Residue, Filterable.......... P, FP, G............... Cool, <=6 [deg]C \18\.. 7 days.
55. Residue, Nonfilterable (TSS). P, FP, G............... Cool, <=6 [deg]C \18\.. 7 days.
56. Residue, Settleable.......... P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
[[Page 57]]
57. Residue, Volatile............ P, FP, G............... Cool, <=6 [deg]C \18\.. 7 days.
61. Silica....................... P or Quartz............ Cool, <=6 [deg]C \18\.. 28 days.
64. Specific conductance......... P, FP, G............... Cool, <=6 [deg]C \18\.. 28 days.
65. Sulfate...................... P, FP, G............... Cool, <=6 [deg]C \18\.. 28 days.
66. Sulfide...................... P, FP, G............... Cool, <=6 [deg]C \18\, 7 days.
add zinc acetate plus
sodium hydroxide to
pH9.
67. Sulfite...................... P, FP, G............... None required.......... Analyze within 15
minutes.
68. Surfactants.................. P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
69. Temperature.................. P, FP, G............... None required.......... Analyze.
73. Turbidity.................... P, FP, G............... Cool, <=6 [deg]C \18\.. 48 hours.
Table lC--Organic Tests \8\
13, 18-20, 22, 24-28, 34-37, 39- G, FP-lined septum..... Cool, <=6 [deg]C \18\, 14 days.
43, 45-47, 56, 76, 104, 105, 108- 0.008% Na2S2O3 \5\.
111, 113. Purgeable Halocarbons.
6, 57, 106. Purgeable aromatic G, FP-lined septum..... Cool, <=6 [deg]C \18\, 14 days.\9\
hydrocarbons. 0.008% Na2S2O3 \5\,
HCl to pH 2 \9\.
3, 4. Acrolein and acrylonitrile. G, FP-lined septum..... Cool, <=6 [deg]C \18\, 14 days.\10\
0.008% Na2S2O3 \5\, pH
to 4-5 \10\.
23, 30, 44, 49, 53, 77, 80, 81, G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
98, 100, 112. Phenols \11\. 0.008% Na2S2O3 \5\. extraction, 40 days
after extraction.
7, 38. Benzidines \11,12\........ G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
0.008% Na2S2O3 \5\. extraction.\13\
14, 17, 48, 50-52. Phthalate G, FP-lined cap........ Cool, <=6 [deg]C \18\.. 7 days until
esters \11\. extraction, 40 days
after extraction.
82-84. Nitrosamines \11,14\...... G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
store in dark, 0.008% extraction, 40 days
Na2S2O3 \5\. after extraction.
88-94. PCBs \11\................. G, FP-lined cap........ Cool, <=6 [deg]C \18\.. 1 year until
extraction, 1 year
after extraction.
54, 55, 75, 79. Nitroaromatics G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
and isophorone \11\. store in dark, 0.008% extraction, 40 days
Na2S2O3 \5\. after extraction.
1, 2, 5, 8-12, 32, 33, 58, 59, G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
74, 78, 99, 101. Polynuclear store in dark, 0.008% extraction, 40 days
aromatic hydrocarbons \11\. Na2S2O3 \5\. after extraction.
15, 16, 21, 31, 87. Haloethers G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
\11\. 0.008% Na2S2O3 \5\. extraction, 40 days
after extraction.
29, 35-37, 63-65, 107. G, FP-lined cap........ Cool, <=6 [deg]C \18\.. 7 days until
Chlorinated hydrocarbons \11\. extraction, 40 days
after extraction.
60-62, 66-72, 85, 86, 95-97, 102,
103. CDDs/CDFs \11\.
Aqueous Samples: Field and Lab G...................... Cool, <=6 [deg]C \18\, 1 year.
Preservation. 0.008% Na2S2O3 \5\,
pH<9.
Solids and Mixed-Phase Samples: G...................... Cool, <=6 [deg]C \18\.. 7 days.
Field Preservation.
Tissue Samples: Field G...................... Cool, <=6 [deg]C \18\.. 24 hours.
Preservation.
Solids, Mixed-Phase, and Tissue G...................... Freeze, <=-10 [deg]C... 1 year.
Samples: Lab Preservation.
Table lD--Pesticides Tests:
1-70. Pesticides \11\............ G, FP-lined cap........ Cool, <=6 [deg]C \18\, 7 days until
pH 5-9 \15\. extraction, 40 days
after extraction.
Table IE--Radiological Tests:
1-5. Alpha, beta, and radium..... P, FP, G............... HNO3 to pH<2........... 6 months.
Table IH--Bacterial Tests:
1. E. coli....................... PA, G.................. Cool, <10 [deg]C, 6 hours.\22\
0.0008% Na2S2O3 \5\.
2. Enterococci................... PA, G.................. Cool, <10 [deg]C, 6 hours.\22\
0.0008% Na2S2O3 \5\.
Table IH--Protozoan Tests:
8. Cryptosporidium............... LDPE; field filtration. 0-8 [deg]C............. 96 hours.\21\
[[Page 58]]
9. Giardia....................... LDPE; field filtration. 0-8 [deg]C............. 96 hours.\21\
----------------------------------------------------------------------------------------------------------------
\1\ ``P'' is polyethylene; ``FP'' is fluoropolymer (polytetrafluoroethylene (PTFE; Teflon[reg]), or other
fluoropolymer, unless stated otherwise in this Table II; ``G'' is glass; ``PA'' is any plastic that is made of
a sterlizable material (polypropylene or other autoclavable plastic); ``LDPE'' is low density polyethylene.
\2\ Except where noted in this Table II and the method for the parameter, preserve each grab sample within 15
minutes of collection. For a composite sample collected with an automated sampler (e.g., using a 24-hour
composite sampler; see 40 CFR 122.21(g)(7)(i) or 40 CFR part 403, Appendix E), refrigerate the sample at <=6
[deg]C during collection unless specified otherwise in this Table II or in the method(s). For a composite
sample to be split into separate aliquots for preservation and/or analysis, maintain the sample at <=6 [deg]C,
unless specified otherwise in this Table II or in the method(s), until collection, splitting, and preservation
is completed. Add the preservative to the sample container prior to sample collection when the preservative
will not compromise the integrity of a grab sample, a composite sample, or an aliquot split from a composite
sample; otherwise, preserve the grab sample, composite sample, or aliquot split from a composite sample within
15 minutes of collection. If a composite measurement is required but a composite sample would compromise
sample integrity, individual grab samples must be collected at prescribed time intervals (e.g., 4 samples over
the course of a day, at 6-hour intervals). Grab samples must be analyzed separately and the concentrations
averaged. Alternatively, grab samples may be collected in the field and composited in the laboratory if the
compositing procedure produces results equivalent to results produced by arithmetic averaging of the results
of analysis of individual grab samples. For examples of laboratory compositing procedures, see EPA Method
1664A (oil and grease) and the procedures at 40 CFR 141.34(f)(14)(iv) and (v) (volatile organics).
\3\ When any sample is to be shipped by common carrier or sent via the U.S. Postal Service, it must comply with
the Department of Transportation Hazardous Materials Regulations (49 CFR part 172). The person offering such
material for transportation is responsible for ensuring such compliance. For the preservation requirements of
Table II, the Office of Hazardous Materials, Materials Transportation Bureau, Department of Transportation has
determined that the Hazardous Materials Regulations do not apply to the following materials: Hydrochloric acid
(HCl) in water solutions at concentrations of 0.04% by weight or less (pH about 1.96 or greater); Nitric acid
(HNO3) in water solutions at concentrations of 0.15% by weight or less (pH about 1.62 or greater); Sulfuric
acid (H2SO4) in water solutions at concentrations of 0.35% by weight or less (pH about 1.15 or greater); and
Sodium hydroxide (NaOH) in water solutions at concentrations of 0.080% by weight or less (pH about 12.30 or
less).
\4\ Samples should be analyzed as soon as possible after collection. The times listed are the maximum times that
samples may be held before the start of analysis and still be considered valid (e.g., samples analyzed for
fecal coliforms may be held up to 6 hours prior to commencing analysis). Samples may be held for longer
periods only if the permittee or monitoring laboratory has data on file to show that, for the specific types
of samples under study, the analytes are stable for the longer time, and has received a variance from the
Regional Administrator under Sec. 136.3(e). For a grab sample, the holding time begins at the time of
collection. For a composite sample collected with an automated sampler (e.g., using a 24-hour composite
sampler; see 40 CFR 122.21(g)(7)(i) or 40 CFR part 403, Appendix E), the holding time begins at the time of
the end of collection of the composite sample. For a set of grab samples composited in the field or
laboratory, the holding time begins at the time of collection of the last grab sample in the set. Some samples
may not be stable for the maximum time period given in the table. A permittee or monitoring laboratory is
obligated to hold the sample for a shorter time if it knows that a shorter time is necessary to maintain
sample stability. See Sec. 136.3(e) for details. The date and time of collection of an individual grab
sample is the date and time at which the sample is collected. For a set of grab samples to be composited, and
that are all collected on the same calendar date, the date of collection is the date on which the samples are
collected. For a set of grab samples to be composited, and that are collected across two calendar dates, the
date of collection is the dates of the two days; e.g., November 14-15. For a composite sample collected
automatically on a given date, the date of collection is the date on which the sample is collected. For a
composite sample collected automatically, and that is collected across two calendar dates, the date of
collection is the dates of the two days; e.g., November 14-15.
\5\ Add a reducing agent only if an oxidant (e.g., chlorine) is present. Reducing agents shown to be effective
are sodium thiosulfate (Na2S2O3), ascorbic acid, sodium arsenite (NaAsO2), or sodium borohydride (NaBH4).
However, some of these agents have been shown to produce a positive or negative cyanide bias, depending on
other substances in the sample and the analytical method used. Therefore, do not add an excess of reducing
agent. Methods recommending ascorbic acid (e.g., EPA Method 335.4) specify adding ascorbic acid crystals, 0.1-
0.6 g, until a drop of sample produces no color on potassium iodide (KI) starch paper, then adding 0.06 g (60
mg) for each liter of sample volume. If NaBH4 or NaAsO2 is used, 25 mg/L NaBH4 or 100 mg/L NaAsO2 will reduce
more than 50 mg/L of chlorine (see method ``Kelada-01'' and/or Standard Method 4500-CN- for more information).
After adding reducing agent, test the sample using KI paper, a test strip (e.g. for chlorine, SenSafe\TM\
Total Chlorine Water Check 480010) moistened with acetate buffer solution (see Standard Method 4500-Cl.C.3e),
or a chlorine/oxidant test method (e.g., EPA Method 330.4 or 330.5), to make sure all oxidant is removed. If
oxidant remains, add more reducing agent. Whatever agent is used, it should be tested to assure that cyanide
results are not affected adversely.
\6\ Sample collection and preservation: Collect a volume of sample appropriate to the analytical method in a
bottle of the material specified. If the sample can be analyzed within 48 hours and sulfide is not present,
adjust the pH to 12 with sodium hydroxide solution (e.g., 5% w/v), refrigerate as specified, and
analyze within 48 hours. Otherwise, to extend the holding time to 14 days and mitigate interferences, treat
the sample immediately using any or all of the following techniques, as necessary, followed by adjustment of
the sample pH to 12 and refrigeration as specified. There may be interferences that are not
mitigated by approved procedures. Any procedure for removal or suppression of an interference may be employed,
provided the laboratory demonstrates that it more accurately measures cyanide. Particulate cyanide (e.g.,
ferric ferrocyanide) or a strong cyanide complex (e.g., cobalt cyanide) are more accurately measured if the
laboratory holds the sample at room temperature and pH 12 for a minimum of 4 hours prior to
analysis, and performs UV digestion or dissolution under alkaline (pH=12) conditions, if necessary.
(1) Sulfur: To remove elemental sulfur (S8), filter the sample immediately. If the filtration time will exceed
15 minutes, use a larger filter or a method that requires a smaller sample volume (e.g., EPA Method 335.4 or
Lachat Method 01). Adjust the pH of the filtrate to > 12 with NaOH, refrigerate the filter and filtrate, and
ship or transport to the laboratory. In the laboratory, extract the filter with 100 mL of 5% NaOH solution for
a minimum of 2 hours. Filter the extract and discard the solids. Combine the 5% NaOH-extracted filtrate with
the initial filtrate, lower the pH to approximately 12 with concentrated hydrochloric or sulfuric acid, and
analyze the combined filtrate. Because the detection limit for cyanide will be increased by dilution by the
filtrate from the solids, test the sample with and without the solids procedure if a low detection limit for
cyanide is necessary. Do not use the solids procedure if a higher cyanide concentration is obtained without
it. Alternatively, analyze the filtrates from the sample and the solids separately, add the amounts determined
(in [mu]g or mg), and divide by the original sample volume to obtain the cyanide concentration.
[[Page 59]]
(2) Sulfide: If the sample contains sulfide as determined by lead acetate paper, or if sulfide is known or
suspected to be present, immediately conduct one of the volatilization treatments or the precipitation
treatment as follows: Volatilization--Headspace expelling. In a fume hood or well-ventilated area, transfer
0.75 liter of sample to a 4.4 L collapsible container (e.g., Cubitainer\TM\). Acidify with concentrated
hydrochloric acid to pH < 2. Cap the container and shake vigorously for 30 seconds. Remove the cap and expel
the headspace into the fume hood or open area by collapsing the container without expelling the sample. Refill
the headspace by expanding the container. Repeat expelling a total of five headspace volumes. Adjust the pH to
12, refrigerate, and ship or transport to the laboratory. Scaling to a smaller or larger sample
volume must maintain the air to sample volume ratio. A larger volume of air will result in too great a loss of
cyanide ( 10%). Dynamic stripping: In a fume hood or well-ventilated area, transfer 0.75 liter of
sample to a container of the material specified and acidify with concentrated hydrochloric acid to pH < 2.
Using a calibrated air sampling pump or flowmeter, purge the acidified sample into the fume hood or open area
through a fritted glass aerator at a flow rate of 2.25 L/min for 4 minutes. Adjust the pH to 12,
refrigerate, and ship or transport to the laboratory. Scaling to a smaller or larger sample volume must
maintain the air to sample volume ratio. A larger volume of air will result in too great a loss of cyanide
( 10%). Precipitation: If the sample contains particulate matter that would be removed by
filtration, filter the sample prior to treatment to assure that cyanide associated with the particulate matter
is included in the measurement. Ship or transport the filter to the laboratory. In the laboratory, extract the
filter with 100 mL of 5% NaOH solution for a minimum of 2 hours. Filter the extract and discard the solids.
Combine the 5% NaOH-extracted filtrate with the initial filtrate, lower the pH to approximately 12 with
concentrated hydrochloric or sulfuric acid, and analyze the combined filtrate. Because the detection limit for
cyanide will be increased by dilution by the filtrate from the solids, test the sample with and without the
solids procedure if a low detection limit for cyanide is necessary. Do not use the solids procedure if a
higher cyanide concentration is obtained without it. Alternatively, analyze the filtrates from the sample and
the solids separately, add the amounts determined (in [mu]g or mg), and divide by the original sample volume
to obtain the cyanide concentration. For removal of sulfide by precipitation, raise the pH of the sample to
12 with NaOH solution, then add approximately 1 mg of powdered cadmium chloride for each mL of
sample. For example, add approximately 500 mg to a 500-mL sample. Cap and shake the container to mix. Allow
the precipitate to settle and test the sample with lead acetate paper. If necessary, add cadmium chloride but
avoid adding an excess. Finally, filter through 0.45 micron filter. Cool the sample as specified and ship or
transport the filtrate and filter to the laboratory. In the laboratory, extract the filter with 100 mL of 5%
NaOH solution for a minimum of 2 hours. Filter the extract and discard the solids. Combine the 5% NaOH-
extracted filtrate with the initial filtrate, lower the pH to approximately 12 with concentrated hydrochloric
or sulfuric acid, and analyze the combined filtrate. Because the detection limit for cyanide will be increased
by dilution by the filtrate from the solids, test the sample with and without the solids procedure if a low
detection limit for cyanide is necessary. Do not use the solids procedure if a higher cyanide concentration is
obtained without it. Alternatively, analyze the filtrates from the sample and the solids separately, add the
amounts determined (in [mu]g or mg), and divide by the original sample volume to obtain the cyanide
concentration. If a ligand-exchange method is used (e.g., ASTM D6888), it may be necessary to increase the
ligand-exchange reagent to offset any excess of cadmium chloride.
(3) Sulfite, thiosulfate, or thiocyanate: If sulfite, thiosulfate, or thiocyanate is known or suspected to be
present, use UV digestion with a glass coil (Method Kelada-01) or ligand exchange (Method OIA-1677) to
preclude cyanide loss or positive interference.
(4) Aldehyde: If formaldehyde, acetaldehyde, or another water-soluble aldehyde is known or suspected to be
present, treat the sample with 20 mL of 3.5% ethylenediamine solution per liter of sample.
(5) Carbonate: Carbonate interference is evidenced by noticeable effervescence upon acidification in the
distillation flask, a reduction in the pH of the absorber solution, and incomplete cyanide spike recovery.
When significant carbonate is present, adjust the pH to =12 using calcium hydroxide instead of
sodium hydroxide. Allow the precipitate to settle and decant or filter the sample prior to analysis (also see
Standard Method 4500-CN.B.3.d).
(6) Chlorine, hypochlorite, or other oxidant: Treat a sample known or suspected to contain chlorine,
hypochlorite, or other oxidant as directed in footnote 5.
\7\ For dissolved metals, filter grab samples within 15 minutes of collection and before adding preservatives.
For a composite sample collected with an automated sampler (e.g., using a 24-hour composite sampler; see 40
CFR 122.21(g)(7)(i) or 40 CFR part 403, appendix E), filter the sample within 15 minutes after completion of
collection and before adding preservatives. If it is known or suspected that dissolved sample integrity will
be compromised during collection of a composite sample collected automatically over time (e.g., by interchange
of a metal between dissolved and suspended forms), collect and filter grab samples to be composited (footnote
2) in place of a composite sample collected automatically.
\8\ Guidance applies to samples to be analyzed by GC, LC, or GC/MS for specific compounds.
\9\ If the sample is not adjusted to pH 2, then the sample must be analyzed within seven days of sampling.
\10\ The pH adjustment is not required if acrolein will not be measured. Samples for acrolein receiving no pH
adjustment must be analyzed within 3 days of sampling.
\11\ When the extractable analytes of concern fall within a single chemical category, the specified preservative
and maximum holding times should be observed for optimum safeguard of sample integrity (i.e., use all
necessary preservatives and hold for the shortest time listed). When the analytes of concern fall within two
or more chemical categories, the sample may be preserved by cooling to <=6 [deg]C, reducing residual chlorine
with 0.008% sodium thiosulfate, storing in the dark, and adjusting the pH to 6-9; samples preserved in this
manner may be held for seven days before extraction and for forty days after extraction. Exceptions to this
optional preservation and holding time procedure are noted in footnote 5 (regarding the requirement for
thiosulfate reduction), and footnotes 12, 13 (regarding the analysis of benzidine).
\12\ If 1,2-diphenylhydrazine is likely to be present, adjust the pH of the sample to 4.0
0.2 to prevent rearrangement to benzidine.
\13\ Extracts may be stored up to 30 days at < 0 [deg]C.
\14\ For the analysis of diphenylnitrosamine, add 0.008% Na2S2O3 and adjust pH to 7-10 with NaOH within 24 hours
of sampling.
\15\ The pH adjustment may be performed upon receipt at the laboratory and may be omitted if the samples are
extracted within 72 hours of collection. For the analysis of aldrin, add 0.008% Na2S2O3.
\16\ Sufficient ice should be placed with the samples in the shipping container to ensure that ice is still
present when the samples arrive at the laboratory. However, even if ice is present when the samples arrive, it
is necessary to immediately measure the temperature of the samples and confirm that the preservation
temperature maximum has not been exceeded. In the isolated cases where it can be documented that this holding
temperature cannot be met, the permittee can be given the option of on-site testing or can request a variance.
The request for a variance should include supportive data which show that the toxicity of the effluent samples
is not reduced because of the increased holding temperature.
\17\ Samples collected for the determination of trace level mercury (<100 ng/L) using EPA Method 1631 must be
collected in tightly-capped fluoropolymer or glass bottles and preserved with BrCl or HCl solution within 48
hours of sample collection. The time to preservation may be extended to 28 days if a sample is oxidized in the
sample bottle. A sample collected for dissolved trace level mercury should be filtered in the laboratory
within 24 hours of the time of collection. However, if circumstances preclude overnight shipment, the sample
should be filtered in a designated clean area in the field in accordance with procedures given in Method 1669.
If sample integrity will not be maintained by shipment to and filtration in the laboratory, the sample must be
filtered in a designated clean area in the field within the time period necessary to maintain sample
integrity. A sample that has been collected for determination of total or dissolved trace level mercury must
be analyzed within 90 days of sample collection.
\18\ Aqueous samples must be preserved at <=6 [deg]C, and should not be frozen unless data demonstrating that
sample freezing does not adversely impact sample integrity is maintained on file and accepted as valid by the
regulatory authority. Also, for purposes of NPDES monitoring, the specification of ``<= [deg]C'' is used in
place of the ``4 [deg]C'' and ``< 4 [deg]C'' sample temperature requirements listed in some methods. It is not
necessary to measure the sample temperature to three significant figures (\1/100\th of 1 degree); rather,
three significant figures are specified so that rounding down to 6 [deg]C may not be used to meet the <=6
[deg]C requirement. The preservation temperature does not apply to samples that are analyzed immediately (less
than 15 minutes).
[[Page 60]]
\19\ An aqueous sample may be collected and shipped without acid preservation. However, acid must be added at
least 24 hours before analysis to dissolve any metals that adsorb to the container walls. If the sample must
be analyzed within 24 hours of collection, add the acid immediately (see footnote 2). Soil and sediment
samples do not need to be preserved with acid. The allowances in this footnote supersede the preservation and
holding time requirements in the approved metals methods.
\20\ To achieve the 28-day holding time, use the ammonium sulfate buffer solution specified in EPA Method 218.6.
The allowance in this footnote supersedes preservation and holding time requirements in the approved
hexavalent chromium methods, unless this supersession would compromise the measurement, in which case
requirements in the method must be followed.
\21\ Holding time is calculated from time of sample collection to elution for samples shipped to the laboratory
in bulk and calculated from the time of sample filtration to elution for samples filtered in the field.
\22\ Samples analysis should begin immediately, preferably within 2 hours of collection. The maximum transport
time to the laboratory is 6 hours, and samples should be processed within 2 hours of receipt at the
laboratory.
\23\ For fecal coliform samples for sewage sludge (biosolids) only, the holding time is extended to 24 hours for
the following sample types using either EPA Method 1680 (LTB-EC) or 1681 (A-1): Class A composted, Class B
aerobically digested, and Class B anaerobically digested.
[38 FR 28758, Oct. 16, 1973]
Editorial Note: For Federal Register citations affecting Sec.
136.3, see the List of CFR Sections Affected, which appears in the
Finding Aids section of the printed volume and on GPO Access.
Sec. 136.4 Application for alternate test procedures.
(a) Any person may apply to the Regional Administrator in the Region
where the discharge occurs for approval of an alternative test
procedure.
(b) When the discharge for which an alternative test procedure is
proposed occurs within a State having a permit program approved pursuant
to section 402 of the Act, the applicant shall submit his application to
the Regional Administrator through the Director of the State agency
having responsibility for issuance of NPDES permits within such State.
(c) Unless and until printed application forms are made available,
an application for an alternate test procedure may be made by letter in
triplicate. Any application for an alternate test procedure under this
paragraph (c) shall:
(1) Provide the name and address of the responsible person or firm
making the discharge (if not the applicant) and the applicable ID number
of the existing or pending permit, issuing agency, and type of permit
for which the alternate test procedure is requested, and the discharge
serial number.
(2) Identify the pollutant or parameter for which approval of an
alternate testing procedure is being requested.
(3) Provide justification for using testing procedures other than
those specified in Table I.
(4) Provide a detailed description of the proposed alternate test
procedure, together with references to published studies of the
applicability of the alternate test procedure to the effluents in
question.
(d) An application for approval of an alternate test procedure for
nationwide use may be made by letter in triplicate to the Alternate Test
Procedure Program Coordinator, Office of Science and Technology (4303),
Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania
Ave., NW., Washington, DC 20460. Any application for an alternate test
procedure under this paragraph (d) shall:
(1) Provide the name and address of the responsible person or firm
making the application.
(2) Identify the pollutant(s) or parameter(s) for which nationwide
approval of an alternate testing procedure is being requested.
(3) Provide a detailed description of the proposed alternate
procedure, together with references to published or other studies
confirming the general applicability of the alternate test procedure to
the pollutant(s) or parameter(s) in waste water discharges from
representative and specified industrial or other categories.
(4) Provide comparability data for the performance of the proposed
alternate test procedure compared to the performance of the approved
test procedures.
[38 FR 28760, Oct. 16, 1973, as amended at 41 FR 52785, Dec. 1, 1976; 62
FR 30763, June 5, 1997; 72 FR 11239, Mar. 12, 2007]
Sec. 136.5 Approval of alternate test procedures.
(a) The Regional Administrator of the region in which the discharge
will
[[Page 61]]
occur has final responsibility for approval of any alternate test
procedure proposed by the responsible person or firm making the
discharge.
(b) Within thirty days of receipt of an application, the Director
will forward such application proposed by the responsible person or firm
making the discharge, together with his recommendations, to the Regional
Administrator. Where the Director recommends rejection of the
application for scientific and technical reasons which he provides, the
Regional Administrator shall deny the application and shall forward this
decision to the Director of the State Permit Program and to the
Alternate Test Procedure Program Coordinator, Office of Science and
Technology (4303), Office of Water, U.S. Environmental Protection
Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460.
(c) Before approving any application for an alternate test procedure
proposed by the responsible person or firm making the discharge, the
Regional Administrator shall forward a copy of the application to the
Alternate Test Procedure Program Coordinator, Office of Science and
Technology (4303), Office of Water, U.S. Environmental Protection
Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460.
(d) Within ninety days of receipt by the Regional Administrator of
an application for an alternate test procedure, proposed by the
responsible person or firm making the discharge, the Regional
Administrator shall notify the applicant and the appropriate State
agency of approval or rejection, or shall specify the additional
information which is required to determine whether to approve the
proposed test procedure. Prior to the expiration of such ninety day
period, a recommendation providing the scientific and other technical
basis for acceptance or rejection will be forwarded to the Regional
Administrator by the Alternate Test Procedure Program Coordinator,
Washington, DC. A copy of all approval and rejection notifications will
be forwarded to the Alternate Test Procedure Program Coordinator, Office
of Science and Technology (4303), Office of Water, U.S. Environmental
Protection Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460,
for the purposes of national coordination.
(e) Approval for nationwide use. (1) As expeditiously as is
practicable after receipt by the Alternate Test Procedure Program
Coordinator, Washington, DC, of an application for an alternate test
procedure for nationwide use, the Alternate Test Procedure Program
Coordinator, Washington, DC, shall notify the applicant in writing
whether the application is complete. If the application is incomplete,
the applicant shall be informed of the information necessary to make the
application complete.
(2) As expeditiously as is practicable after receipt of a complete
package, the Alternate Test Procedure Program Coordinator shall perform
any analysis necessary to determine whether the alternate test procedure
satisfies the applicable requirements of this part, and the Alternate
Test Procedure Program Coordinator shall recommend to the Administrator
that he/she approve or reject the application and shall also notify the
application of the recommendation.
(3) As expeditiously as practicable, an alternate method determined
by the Administrator to satisfy the applicable requirements of this part
shall be proposed by EPA for incorporation in subsection 136.3 of 40 CFR
part 136. EPA shall make available for review all the factual bases for
its proposal, including any performance data submitted by the applicant
and any available EPA analysis of those data.
(4) Following a period of public comment, EPA shall, as
expeditiously as practicable, publish in the Federal Register a final
decision to approve or reject the alternate method.
[38 FR 28760, Oct. 16, 1973, as amended at 41 FR 52785, Dec. 1, 1976; 55
FR 33440, Aug. 15, 1990; 62 FR 30763, June 5, 1997; 72 FR 11239, Mar.
12, 2007]
Sec. 136.6 Method modifications and analytical requirements.
(a) Definitions of terms used in this section.
(1) Analyst means the person or laboratory using a test procedure
(analytical method) in this Part.
(2) Chemistry of the method means the reagents and reactions used in
a test
[[Page 62]]
procedure that allow determination of the analyte(s) of interest in an
environmental sample.
(3) Determinative technique means the way in which an analyte is
identified and quantified (e.g., colorimetry, mass spectrometry).
(4) Equivalent Performance means that the modified method produces
results that meet the QC acceptance criteria of the approved method at
this part.
(5) Method-defined analyte means an analyte defined solely by the
method used to determine the analyte. Such an analyte may be a physical
parameter, a parameter that is not a specific chemical, or a parameter
that may be comprised of a number of substances. Examples of such
analytes include temperature, oil and grease, total suspended solids,
total phenolics, turbidity, chemical oxygen demand, and biochemical
oxygen demand.
(6) QC means ``quality control.''
(b) Method modifications--(1) Allowable changes. Except as set forth
in paragraph (b)(3) of this section, an analyst may modify an approved
test procedure (analytical method) provided that the chemistry of the
method or the determinative technique is not changed, and provided that
the requirements of paragraph (b)(2) of this section are met.
(i) Potentially acceptable modifications regardless of current
method performance include changes between automated and manual discrete
instrumentation; changes in the calibration range (provided that the
modified range covers any relevant regulatory limit); changes in
equipment such as using similar equipment from a vendor other than that
mentioned in the method (e.g., a purge-and-trap device from OIA rather
than Tekmar), changes in equipment operating parameters such as changing
the monitoring wavelength of a colorimeter or modifying the temperature
program for a specific GC column; changes to chromatographic columns
(treated in greater detail in paragraph (d) of this section); and
increases in purge-and-trap sample volumes (provided specifications in
paragraph (e) of this section are met). The changes are only allowed
provided that all the requirements of paragraph (b)(2) of this section
are met.
(ii) If the characteristics of a wastewater matrix prevent efficient
recovery of organic pollutants and prevent the method from meeting QC
requirements, the analyst may attempt to resolve the issue by using
salts as specified in Guidance on Evaluation, Resolution, and
Documentation of Analytical Problems Associated with Compliance
Monitoring (EPA 821-B-93-001, June 1993), provided that such salts do
not react with or introduce the target pollutant into the sample (as
evidenced by the analysis of method blanks, laboratory control samples,
and spiked samples that also contain such salts) and that all
requirements of paragraph (b)(2) of this section are met. Chlorinated
samples must be dechlorinated prior to the addition of such salts.
(iii) If the characteristics of a wastewater matrix result in poor
sample dispersion or reagent deposition on equipment and prevents the
analyst from meeting QC requirements, the analysts may attempt to
resolve the issue by adding an inert surfactant (i.e. a surfactant that
will not affect the chemistry of the method), which may include Brij-35
or sodium dodecyl sulfate (SDS), provided that such surfactant does not
react with or introduce the target pollutant into the sample (as
evidenced by the analysis of method blanks, laboratory control samples,
and spiked samples that also contain such surfactant) and that all
requirements of paragraph (b)(2) of this section are met. Chlorinated
samples must be dechlorinated prior to the addition of such surfactant.
(2) Requirements. A modified method must produce equivalent
performance to the approved methods for the analyte(s) of interest, and
the equivalent performance must be documented.
(i) Requirements for establishing equivalent performance
(A) If the approved method contains QC tests and QC acceptance
criteria, the modified method must use these QC tests and the modified
method must meet the QC acceptance criteria. The Analyst may only rely
on QC tests and QC acceptance criteria in a method if it includes
wastewater matrix QC tests and QC acceptance criteria (e.g., as matrix
spikes) and both initial (start-up)
[[Page 63]]
and ongoing QC tests and QC acceptance criteria.
(B) If the approved method does not contain QC tests and QC
acceptance criteria, or if the QC tests and QC acceptance criteria in
the method do not meet the requirements of paragraph (b)(2)(i)(A) of
this section, the analyst must employ QC tests specified in Protocol for
EPA Approval of Alternate Test Procedures for Organic and Inorganic
Analytes in Wastewater and Drinking Water (EPA-821-B-98-002, March 1999)
and meet the QC provisions specified therein. In addition, the Analyst
must perform on-going QC tests, including assessment of performance of
the modified method on the sample matrix (e.g., analysis of a matrix
spike/matrix spike duplicate pair for every twenty samples of a
discharge analyzed), and analysis of an ongoing precision and recovery
sample and a blank with each batch of 20 or fewer samples.
(C) Calibration must be performed using the modified method and the
modified method must be tested with every wastewater matrix to which it
will be applied (up to nine distinct matrices; as described in the ATP
Protocol, after validation in nine distinct matrices, the method may be
applied to all wastewater matrices), in addition to any and all reagent
water tests. If the performance in the wastewater matrix or reagent
water does not meet the QC acceptance criteria the method modification
may not be used.
(D) Analysts must test representative effluents with the modified
method, and demonstrate that the results are equivalent or superior to
results with the unmodified method.
(ii) Requirements for documentation. The modified method must be
documented in a method write-up or an addendum that describes the
modification(s) to the approved method. The write-up or addendum must
include a reference number (e.g., method number), revision number, and
revision date so that it may be referenced accurately. In addition, the
organization that uses the modified method must document the results of
QC tests and keep these records, along with a copy of the method write-
up or addendum, for review by an auditor.
(3) Restrictions. An analyst may not modify an approved analytical
method for a method-defined analyte. In addition, an analyst may not
modify an approved method if the modification would result in
measurement of a different form or species of an analyte (e.g., a change
to a metals digestion or total cyanide distillation). An analyst may
also may not modify any sample preservation and/or holding time
requirements of an approved method.
(c) Analytical requirements for multi-analyte methods (Target
Analytes). For the purpose of NPDES reporting, the discharger or
permittee must meet QC requirements only for the analyte(s) being
measured and reported under the NPDES permit.
(d) The following modifications to approved methods are authorized
in the circumstances described below:
(1) Capillary column. Use of a capillary (open tubular) GC column
rather than a packed column is allowed with EPA Methods 601-613, 624,
625, and 1624B in Appendix A to this part, provided that all QC tests
for the approved method are performed and all QC acceptance criteria are
met. When changing from a packed column to a capillary column, retention
times will change. Analysts are not required to meet retention time
specified in the approved method when this change is made. Instead,
analysts must generate new retention time tables with capillary columns
to be kept on file along with other startup test and ongoing QC data,
for review by auditors.
(2) Increased sample volume in purge and trap methodology. Use of
increased sample volumes, up to a maximum of 25 mL, is allowed for an
approved method, provided that the height of the water column in the
purge vessel is at least 5 cm. The analyst should also use one or more
surrogate analytes that are chemically similar to the analytes of
interest in order to demonstrate that the increased sample volume does
not adversely affect the analytical results.
[72 FR 11239, Mar. 12, 2007]
[[Page 64]]
Sec. Appendix A to Part 136--Methods for Organic Chemical Analysis of
Municipal and Industrial Wastewater
Method 601--Purgeable Halocarbons
1. Scope and Application
1.1 This method covers the determination of 29 purgeable
halocarbons.
The following parameters may be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Bromodichloromethane........................... 32101 75-27-4
Bromoform...................................... 32104 75-25-2
Bromomethane................................... 34413 74-83-9
Carbon tetrachloride........................... 32102 56-23-5
Chlorobenzene.................................. 34301 108-90-7
Chloroethane................................... 34311 75-00-3
2-Chloroethylvinyl ether....................... 34576 100-75-8
Chloroform..................................... 32106 67-66-3
Chloromethane.................................. 34418 74-87-3
Dibromochloromethane........................... 32105 124-48-1
1,2-Dichlorobenzene............................ 34536 95-50-1
1,3-Dichlorobenzene............................ 34566 541-73-1
1,4-Dichlorobenzene............................ 34571 106-46-7
Dichlorodifluoromethane........................ 34668 75-71-8
1,1-Dichloroethane............................. 34496 75-34-3
1,2-Dichloroethane............................. 34531 107-06-2
1,1-Dichloroethane............................. 34501 75-35-4
trans-1,2-Dichloroethene....................... 34546 156-60-5
1,2-Dichloropropane............................ 34541 78-87-5
cis-1,3-Dichloropropene........................ 34704 10061-01-5
trans-1,3-Dichloropropene...................... 34699 10061-02-6
Methylene chloride............................. 34423 75-09-2
1,1,2,2-Tetrachloroethane...................... 34516 79-34-5
Tetrachloroethene.............................. 34475 127-18-4
1,1,1-Trichloroethane.......................... 34506 71-55-6
1,1,2-Trichloroethane.......................... 34511 79-00-5
Tetrachloroethene.............................. 39180 79-01-6
Trichlorofluoromethane......................... 34488 75-69-4
Vinyl chloride................................. 39715 75-01-4
------------------------------------------------------------------------
1.2 This is a purge and trap gas chromatographic (GC) method
applicable to the determination of the compounds listed above in
municipal and industrial discharges as provided under 40 CFR 136.1. When
this method is used to analyze unfamiliar samples for any or all of the
compounds above, compound identifications should be supported by at
least one additional qualitative technique. This method describes
analytical conditions for a second gas chromatographic column that can
be used to confirm measurements made with the primary column. Method 624
provides gas chromatograph/mass spectrometer (GC/MS) conditions
appropriate for the qualitative and quantitative confirmation of results
for most of the parameters listed above.
1.3 The method detection limit (MDL, defined in Section 12.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the operation of a purge and trap system and a
gas chromatograph and in the interpretation of gas chromatograms. Each
analyst must demonstrate the ability to generate acceptable results with
this method using the procedure described in Section 8.2.
2. Summary of Method
2.1 An inert gas is bubbled through a 5-mL water sample contained in
a specially-designed purging chamber at ambient temperature. The
halocarbons are efficiently transferred from the aqueous phase to the
vapor phase. The vapor is swept through a sorbent trap where the
halocarbons are trapped. After purging is completed, the trap is heated
and backflushed with the inert gas to desorb the halocarbons onto a gas
chromatographic column. The gas chromatograph is temperature programmed
to separate the halocarbons which are then detected with a halide-
specific detector. \2,3\
2.2 The method provides an optional gas chromatographic column that
may be helpful in resolving the compounds of interest from interferences
that may occur.
3. Interferences
3.1 Impurities in the purge gas and organic compounds outgassing
from the plumbing ahead of the trap account for the majority of
contamination problems. The analytical system must be demonstrated to be
free from contamination under the conditions of the analysis by running
laboratory reagent blanks as described in Section 8.1.3. The use of non-
Teflon plastic tubing, non-Teflon thread sealants, or flow controllers
with rubber components in the purge and trap system should be avoided.
3.2 Samples can be contaminated by diffusion of volatile organics
(particularly fluorocarbons and methylene chloride) through the septum
seal ilto the sample during shipment and storage. A field reagent blank
prepared from reagent water and carried through the sampling and
handling protocol can serve as a check on such contamination.
3.3 Contamination by carry-over can occur whenever high level and
low level samples are sequentially analyzed. To reduce carry-over, the
purging device and sample syringe must be rinsed with reagent water
between sample analyses. Whenever an unusually concentrated sample is
encountered, it should be followed by an analysis of reagent water to
check for cross contamination. For samples containing large amounts of
water-soluble materials, suspended solids,
[[Page 65]]
high boiling compounds or high organohalide levels, it may be necessary
to wash out the purging device with a detergent solution, rinse it with
distilled water, and then dry it in a 105[deg]C oven between analyses.
The trap and other parts of the system are also subject to
contamination; therefore, frequent bakeout and purging of the entire
system may be required.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \4,6\ for
the information of the analyst.
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: carbon tetrachloride, chloroform, 1,4-dichlorobenzene, and
vinyl chloride. Primary standards of these toxic compounds should be
prepared in a hood. A NIOSH/MESA approved toxic gas respirator should be
worn when the analyst handles high concentrations of these toxic
compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete sampling.
5.1.1 Vial--25-mL capacity or larger, equipped with a screw cap with
a hole in the center (Pierce 13075 or equivalent). Detergent
wash, rinse with tap and distilled water, and dry at 105 [deg]C before
use.
5.1.2 Septum--Teflon-faced silicone (Pierce 12722 or
equivalent). Detergent wash, rinse with tap and distilled water, and dry
at 105 [deg]C for 1 h before use.
5.2 Purge and trap system--The purge and trap system consists of
three separate pieces of equipment: a purging device, trap, and
desorber. Several complete systems are now commercially available.
5.2.1 The purging device must be designed to accept 5-mL samples
with a water column at least 3 cm deep. The gaseous head space between
the water column and the trap must have a total volume of less than 15
mL. The purge gas must pass through the water column as finely divided
bubbles with a diameter of less than 3 mm at the origin. The purge gas
must be introduced no more than 5 mm from the base of the water column.
The purging device illustrated in Figure 1 meets these design criteria.
5.2.2 The trap must be at least 25 cm long and have an inside
diameter of at least 0.105 in. The trap must be packed to contain the
following minimum lengths of adsorbents: 1.0 cm of methyl silicone
coated packing (Section 6.3.3), 7.7 cm of 2,6-diphenylene oxide polymer
(Section 6.3.2), 7.7 cm of silica gel (Section 6.3.4), 7.7 cm of coconut
charcoal (Section 6.3.1). If it is not necessary to analyze for
dichlorodifluoromethane, the charcoal can be eliminated, and the polymer
section lengthened to 15 cm. The minimum specifications for the trap are
illustrated in Figure 2.
5.2.3 The desorber must be capable of rapidly heating the trap to
180 [deg]C. The polymer section of the trap should not be heated higher
than 180 [deg]C and the remaining sections should not exceed 200 [deg]C.
The desorber illustrated in Figure 2 meets these design criteria.
5.2.4 The purge and trap system may be assembled as a separate unit
or be coupled to a gas chromatograph as illustrated in Figures 3 and 4.
5.3 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, gases, detector, and strip-chart recorder. A data system is
recommended for measuring peak areas.
5.3.1 Column 1--8 ft long x 0.1 in. ID stainless steel or glass,
packed with 1% SP-1000 on Carbopack B (60/80 mesh) or equivalent. This
column was used to develop the method performance statements in Section
12. Guidelines for the use of alternate column packings are provided in
Section 10.1.
5.3.2 Column 2--6 ft long x 0.1 in. ID stainless steel or glass,
packed with chemically bonded n-octane on Porasil-C (100/120 mesh) or
equivalent.
5.3.3 Detector--Electrolytic conductivity or microcoulometric
detector. These types of detectors have proven effective in the analysis
of wastewaters for the parameters listed in the scope (Section 1.1). The
electrolytic conductivity detector was used to develop the method
performance statements in Section 12. Guidelines for the use of
alternate detectors are provided in Section 10.1.
5.4 Syringes--5-mL glass hypodermic with Luerlok tip (two each), if
applicable to the purging device.
5.5 Micro syringes--25-[micro]L, 0.006 in. ID needle.
5.6 Syringe valve--2-way, with Luer ends (three each).
5.7 Syringe--5-mL, gas-tight with shut-off valve.
5.8 Bottle--15-mL, screw-cap, with Teflon cap liner.
[[Page 66]]
5.9 Balance--Analytical, capable of accurately weighing 0.0001 g.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.1.1 Reagent water can be generated by passing tap water through a
carbon filter bed containing about 1 lb of activated carbon (Filtrasorb-
300, Calgon Corp., or equivalent).
6.1.2 A water purification system (Millipore Super-Q or equivalent)
may be used to generate reagent water.
6.1.3 Reagent water may also be prepared by boiling water for 15
min. Subsequently, while maintaining the temperature at 90 [deg]C,
bubble a contaminant-free inert gas through the water for 1 h. While
still hot, transfer the water to a narrow mouth screw-cap bottle and
seal with a Teflon-lined septum and cap.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Trap Materials:
6.3.1 Coconut charcoal--6/10 mesh sieved to 26 mesh, Barnabey
Cheney, CA-580-26 lot M-2649 or equivalent.
6.3.2 2,6-Diphenylene oxide polymer--Tenax, (60/80 mesh),
chromatographic grade or equivalent.
6.3.3 Methyl silicone packing--3% OV-1 on Chromosorb-W (60/80 mesh)
or equivalent.
6.3.4 Silica gel--35/60 mesh, Davison, grade-15 or equivalent.
6.4 Methanol--Pesticide quality or equivalent.
6.5 Stock standard solutions--Stock standard solutions may be
prepared from pure standard materials or purchased as certified
solutions. Prepare stock standard solutions in methanol using assayed
liquids or gases as appropriate. Because of the toxicity of some of the
organohalides, primary dilutions of these materials should be prepared
in a hood. A NIOSH/MESA approved toxic gas respirator should be used
when the analyst handles high concentrations of such materials.
6.5.1 Place about 9.8 mL of methanol into a 10-mL ground glass
stoppered volumetric flask. Allow the flask to stand, unstoppered, for
about 10 min or until all alcohol wetted surfaces have dried. Weigh the
flask to the learest 0.1 mg.
6.5.2 Add the assayed reference material:
6.5.2.1 Liquid--Using a 100 [micro]L syringe, immediately add two or
more drops of assayed reference material to the flask, then reweigh. Be
sure that the drops fall directly into the alcohol without contacting
the neck of the flask.
6.5.2.2 Gases--To prepare standards for any of the six halocarbons
that boil below 30 [deg] C (bromomethane, chloroethane, chloromethane,
dichlorodifluoromethane, trichlorofluoromethane, vinyl chloride), fill a
5-mL valved gas-tight syringe with the reference standard to the 5.0-mL
mark. Lower the needle to 5 mm above the methanol meniscus. Slowly
introduce the reference standard above the surface of the liquid (the
heavy gas will rapidly dissolve into the methanol).
6.5.3 Reweigh, dilute to volume, stopper, then mix by inverting the
flask several times. Calculate the concentration in [micro]g/[micro]L
from the net gain in weight. When compound purity is assayed to be 96%
or greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
malufacturer or by an independent source.
6.5.4 Transfer the stock standard solution into a Teflon-sealed
screw-cap bottle. Store, with minimal headspace, at -10 to -20 [deg]C
and protect from light.
6.5.5 Prepare fresh standards weekly for the six gases and 2-
chloroethylvinyl ether. All other standards must be replaced after one
month, or sooner if comparison with check standards indicates a problem.
6.6 Secondary dilution standards--Using stock standard solutions,
prepare secondary dilution standards in methanol that contain the
compounds of interest, either singly or mixed together. The secondary
dilution standards should be prepared at concentrations such that the
aqueous calibration standards prepared in Section 7.3.1 or 7.4.1 will
bracket the working range of the analytical system. Secondary dilution
standards should be stored with minimal headspace and should be checked
frequently for signs of degradation or evaporation, especially just
prior to preparing calibration standards from them.
6.7 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Assemble a purge and trap system that meets the specifications
in Section 5.2. Condition the trap overnight at 180 [deg]C by
backflushing with an inert gas flow of at least 20 mL/min. Condition the
trap for 10 min once daily prior to use.
7.2 Connect the purge and trap system to a gas chromatograph. The
gas chromatograph must be operated using temperature and flow rate
conditions equivalent to those given in Table 1. Calibrate the purge and
trap-gas chromatographic system using either the external standard
technique (Section 7.3) or the internal standard technique (Section
7.4).
7.3 External standard calibration procedure:
7.3.1 Prepare calibration standards at a miminum of three
concentration levels for each parameter by carefully adding 20.0
[micro]L of one or more secondary dilution standards to 100, 500, or
1000 [micro]L of reagent water. A 25-[micro]L
[[Page 67]]
syringe with a 0.006 in. ID needle should be used for this operation.
One of the external standards should be at a concentration near, but
above, the MDL (Table 1) and the other concentrations should correspond
to the expected range of concentrations found in real samples or should
define the working range of the detector. These aqueous standards can be
stored up to 24 h, if held in sealed vials with zero headspace as
described in Section 9.2. If not so stored, they must be discarded after
1 h.
7.3.2 Analyze each calibration standard according to Section 10, and
tabulate peak height or area responses versus the concentration in the
standard. The results can be used to prepare a calibration curve for
each compound. Alternatively, if the ratio of response to concentration
(calibration factor) is a constant over the working range (<10% relative
standard deviation, RSD), linearity through the origin can be assumed
and the average ratio or calibration factor can be used in place of a
calibration curve.
7.4 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples. The compounds recommended for use as surrogate spikes in
Section 8.7 have been used successfully as internal standards, because
of their generally unique retention times.
7.4.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest as described in
Section 7.3.1.
7.4.2 Prepare a spiking solution containing each of the internal
standards using the procedures described in Sections 6.5 and 6.6. It is
recommended that the secondary dilution standard be prepared at a
concentration of 15 [micro]g/mL of each internal standard compound. The
addition of 10 [micro]L of this standard to 5.0 mL of sample or
calibration standard would be equivalent to 30 [micro]g/L.
7.4.3 Analyze each calibration standard according to Section 10,
adding 10 [micro]L of internal standard spiking solution directly to the
syringe (Section 10.4). Tabulate peak height or area responses against
concentration for each compound and internal standard, and calculate
response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.094
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard.
Cs=Concentration of the parameter to be measured.
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.5 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of a QC check sample.
7.5.1 Prepare the QC check sample as described in Section 8.2.2.
7.5.2 Analyze the QC check sample according to Section 10.
7.5.3 For each parameter, compare the response (Q) with the
corresponding calibration acceptance criteria found in Table 2. If the
responses for all parameters of interest fall within the designated
ranges, analysis of actual samples can begin. If any individual Q falls
outside the range, proceed according to Section 7.5.4.
Note: The large number of parameters in Table 2 present a
substantial probability that one or more will not meet the calibration
acceptance criteria when all parameters are analyzed.
7.5.4 Repeat the test only for those parameters that failed to meet
the calibration acceptance criteria. If the response for a parameter
does not fall within the range in this second test, a new calibration
curve, calibration factor, or RF must be prepared for that parameter
according to Section 7.3 or 7.4.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision
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with this method. This ability is established as described in Section
8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Section 10.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Each day, the analyst must analyze a reagent water blank to
demonstrate that interferences from the analytical system are under
control.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 10 [micro]g/
mL in methanol. The QC check sample concentrate must be obtained from
the U.S. Environmental Protection Agency, Environmental Monitoring and
Support Laboratory in Cincinnati, Ohio, if available. If not available
from that source, the QC check sample concentrate must be obtained from
another external source. If not available from either source above, the
QC check sample concentrate must be prepared by the laboratory using
stock standards prepared independently from those used for calibration.
8.2.2 Prepare a QC check sample to contain 20 [micro]g/L of each
parameter by adding 200 [micro]L of QC check sample concentrate to 100
mL of reagent water.
8.2.3 Analyze four 5-mL aliquots of the well-mixed QC check sample
according to Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
of interest using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, then the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 2 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.3.
8.2.6.2 Beginning with Section 8.2.3, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.3.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 20 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.2 Analyze one 5-mL sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second 5-mL sample aliquot with 10
[micro]L of the QC check sample concentrate and analyze it to determine
the concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement
[[Page 69]]
of both the background and spike concentrations, assuming a spike to
background ratio of 5:1. This error will be accounted for to the extent
that the analyst's spike to background ratio approaches 5:1. \7\ If
spiking was performed at a concentration lower than 20 [micro]g/L, the
analyst must use either the QC acceptance criteria in Table 2, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 3, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 3,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T)2.44(100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory. If the entire list of parameters in Table 2 must be measured
in the sample in Section 8.3, the probability that the analysis of a QC
check standard will be required is high. In this case the QC check
standard should be routinely analyzed with the spiked sample.
8.4.1 Prepare the QC check standard by adding 10 [micro]L of QC
check sample concentrate (Section 8.2.1 or 8.3.2) to 5 mL of reagent
water. The QC check standard needs only to contain the parameters that
failed criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If p=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
8.7 The analyst should monitor both the performance of the
analytical system and the effectiveness of the method in dealing with
each sample matrix by spiking each sample, standard, and reagent water
blank with surrogate halocarbons. A combination of bromochloromethane,
2-bromo-1-chloropropane, and 1,4-dichlorobutane is recommended to
encompass the range of the temperature program used in this method. From
stock standard solutions prepared as in Section 6.5, add a volume to
give 750 [micro]g of each surrogate to 45 mL of reagent water contained
in a 50-mL volumetric flask, mix and dilute to volume for a
concentration of 15 ng/[micro]L. Add 10 [micro]L of this surrogate
spiking solution directly into the 5-mL syringe with every sample and
reference standard analyzed. Prepare a fresh surrogate spiking solution
on a weekly basis. If the internal standard calibration procedure is
being used, the surrogate compounds may be added directly to the
internal standard spiking solution (Section 7.4.2).
9. Sample Collection, Preservation, and Handling
9.1 All samples must be iced or refrigerated from the time of
collection until analysis. If the sample contains free or combined
chlorine, add sodium thiosulfate preservative (10 mg/40 mL is sufficient
for up to 5 ppm Cl2) to the empty sample bottle just prior to
shipping to the sampling site. EPA Methods 330.4 and 330.5 may be used
for measurement of residual chlorine. \8\ Field test kits are available
for this purpose.
9.2 Grab samples must be collected in glass containers having a
total volume of at least 25 mL. Fill the sample bottle just to
overflowing in such a manner that no air
[[Page 70]]
bubbles pass through the sample as the bottle is being filled. Seal the
bottle so that no air bubbles are entrapped in it. If preservative has
been added, shake vigorously for 1 min. Maintain the hermetic seal on
the sample bottle until time of analysis.
9.3 All samples must be analyzed within 14 days of collection. \3\
10. Procedure
10.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are estimated retention times
and MDL that can be achieved under these conditions. An example of the
separations achieved by Column 1 is shown in Figure 5. Other packed
columns, chromatographic conditions, or detectors may be used if the
requirements of Section 8.2 are met.
10.2 Calibrate the system daily as described in Section 7.
10.3 Adjust the purge gas (nitrogen or helium) flow rate to 40 mL/
min. Attach the trap inlet to the purging device, and set the purge and
trap system to purge (Figure 3). Open the syringe valve located on the
purging device sample introduction needle.
10.4 Allow the sample to come to ambient temperature prior to
introducing it to the syringe. Remove the plunger from a 5-mL syringe
and attach a closed syringe valve. Open the sample bottle (or standard)
and carefully pour the sample into the syringe barrel to just short of
overflowing. Replace the syringe plunger and compress the sample. Open
the syringe valve and vent any residual air while adjusting the sample
volume to 5.0 mL. Since this process of taking an aliquot destroys the
validity of the sample for future analysis, the analyst should fill a
second syringe at this time to protect against possible loss of data.
Add 10.0 [micro]L of the surrogate spiking solution (Section 8.7) and
10.0 [micro]L of the internal standard spiking solution (Section 7.4.2),
if applicable, through the valve bore, then close the valve.
10.5 Attach the syringe-syringe valve assembly to the syringe valve
on the purging device. Open the syringe valves and inject the sample
into the purging chamber.
10.6 Close both valves and purge the sample for 11.0 0.1 min at ambient temperature.
10.7 After the 11-min purge time, attach the trap to the
chromatograph, adjust the purge and trap system to the desorb mode
(Figure 4), and begin to temperature program the gas chromatograph.
Introduce the trapped materials to the GC column by rapidly heating the
trap to 180 [deg]C while backflushing the trap with an inert gas between
20 and 60 mL/min for 4 min. If rapid heating of the trap cannot be
achieved, the GC column must be used as a secondary trap by cooling it
to 30 [deg]C (subambient temperature, if poor peak geometry or random
retention time problems persist) instead of the initial program
temperature of 45 [deg]C
10.8 While the trap is being desorbed into the gas chromatograph,
empty the purging chamber using the sample introduction syringe. Wash
the chamber with two 5-mL flushes of reagent water.
10.9 After desorbing the sample for 4 min, recondition the trap by
returning the purge and trap system to the purge mode. Wait 15 s then
close the syringe valve on the purging device to begin gas flow through
the trap. The trap temperature should be maintained at 180 [deg]C After
approximately 7 min, turn off the trap heater and open the syringe valve
to stop the gas flow through the trap. When the trap is cool, the next
sample can be analyzed.
10.10 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
10.11 If the response for a peak exceeds the working range of the
system, prepare a dilution of the sample with reagent water from the
aliquot in the second syringe and reanalyze.
11. Calculations
11.1 Determine the concentration of individual compounds in the
sample.
11.1.1 If the external standard calibration procedure is used,
calculate the concentration of the parameter being measured from the
peak response using the calibration curve or calibration factor
determined in Section 7.3.2.
11.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.4.3 and Equation 2.
Equation 2
[GRAPHIC] [TIFF OMITTED] TC15NO91.095
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard.
11.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
[[Page 71]]
12. Method Performance
12.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentration
listed in Table 1 were obtained using reagent water. \11\. Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
12.2 This method is recommended for use in the concentration range
from the MDL to 1000xMDL. Direct aqueous injection techniques should be
used to measure concentration levels above 1000xMDL.
12.3 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 8.0 to 500 [micro]g/L. \9\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. Bellar, T.A., and Lichtenberg, J.J. ``Determining Volatile
Organics at Microgram-per-Litre-Levels by Gas Chromatography,'' Journal
of the American Water Works Association, 66, 739 (1974).
3. Bellar, T.A., and Lichtenberg, J.J. ``Semi-Automated Headspace
Analysis of Drinking Waters and Industrial Waters for Purgeable Volatile
Organic Compounds,'' Proceedings from Symposium on Measurement of
Organic Pollutants in Water and Wastewater, American Society for Testing
and Materials, STP 686, C.E. Van Hall, editor, 1978.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA 600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
9. ``EPA Method Study 24, Method 601--Purgeable Halocarbons by the
Purge and Trap Method,'' EPA 600/4-84-064, National Technical
Information Service, PB84-212448, Springfield, Virginia 22161, July
1984.
10. ``Method Validation Data for EPA Method 601,'' Memorandum from
B. Potter, U.S. Environmental Protection Agency, Environmental
Monitoring and Support Laboratory, Cincinnati, Ohio 45268, November 10,
1983.
11. Bellar, T. A., Unpublished data, U.S. Environmental Protection
Agency, Environmental Monitoring and Support Laboratory, Cincinnati,
Ohio 45268, 1981.
Table 1--Chromatographic Conditions and Method Detection Limits
----------------------------------------------------------------------------------------------------------------
Retention time (min) Method detection
Parameter ------------------------------------ limit ([micro]g/
Column 1 Column 2 L)
----------------------------------------------------------------------------------------------------------------
Chloromethane............................................. 1.50 5.28 0.08
Bromomethane.............................................. 2.17 7.05 1.18
Dichlorodifluoromethane................................... 2.62 nd 1.81
Vinyl chloride............................................ 2.67 5.28 0.18
Chloroethane.............................................. 3.33 8.68 0.52
Methylene chloride........................................ 5.25 10.1 0.25
Trichlorofluoromethane.................................... 7.18 nd nd
1,1-Dichloroethene........................................ 7.93 7.72 0.13
1,1-Dichloroethane........................................ 9.30 12.6 0.07
trans-1,2-Dichloroethene.................................. 10.1 9.38 0.10
Chloroform................................................ 10.7 12.1 0.05
1,2-Dichloroethane........................................ 11.4 15.4 0.03
1,1,1-Trichloroethane..................................... 12.6 13.1 0.03
Carbon tetrachloride...................................... 13.0 14.4 0.12
Bromodichloromethane...................................... 13.7 14.6 0.10
1,2-Dichloropropane....................................... 14.9 16.6 0.04
cis-1,3-Dichloropropene................................... 15.2 16.6 0.34
Trichloroethene........................................... 15.8 13.1 0.12
Dibromochloromethane...................................... 16.5 16.6 0.09
[[Page 72]]
1,1,2-Trichloroethane..................................... 16.5 18.1 0.02
trans-1,3-Dichloropropene................................. 16.5 18.0 0.20
2-Chloroethylvinyl ether.................................. 18.0 nd 0.13
Bromoform................................................. 19.2 19.2 0.20
1,1,2,2-Tetrachloroethane................................. 21.6 nd 0.03
Tetrachloroethene......................................... 21.7 15.0 0.03
Chlorobenzene............................................. 24.2 18.8 0.25
1,3-Dichlorobenzene....................................... 34.0 22.4 0.32
1,2-Dichlorobenzene....................................... 34.9 23.5 0.15
1,4-Dichlorobenzene....................................... 35.4 22.3 0.24
----------------------------------------------------------------------------------------------------------------
Column 1 conditions: Carbopack B (60/80 mesh) coated with 1% SP-1000 packed in an 8 ft x 0.1 in. ID stainless
steel or glass column with helium carrier gas at 40 mL/min flow rate. Column temperature held at 45 [deg]C for
3 min then programmed at 8 [deg]C/min to 220 [deg]C and held for 15 min.
Column 2 conditions: Porisil-C (100/120 mesh) coated with n-octane packed in a 6 ft x 0.1 in. ID stainless steel
or glass column with helium carrier gas at 40 mL/min flow rate. Column temperature held at 50 [deg]C for 3 min
then programmed at 6 [deg]C/min to 170 [deg]C and held for 4 min.
nd=not determined.
Table 2--Calibration and QC Acceptance Criteria--Method 601 \a\
----------------------------------------------------------------------------------------------------------------
Limit for
Range for Q s Range for X Range P,
Parameter ([micro]g/L) ([micro]g/ ([micro]g/L) Ps (%)
L)
----------------------------------------------------------------------------------------------------------------
Bromodichloromethane.................................... 15.2-24.8 4.3 10.7-32.0 42-172
Bromoform............................................... 14.7-25.3 4.7 5.0-29.3 13-159
Bromomethane............................................ 11.7-28.3 7.6 3.4-24.5 D-144
Carbon tetrachloride.................................... 13.7-26.3 5.6 11.8-25.3 43-143
Chlorobenzene........................................... 14.4-25.6 5.0 10.2-27.4 38-150
Chloroethane............................................ 15.4-24.6 4.4 11.3-25.2 46-137
2-Chloroethylvinyl ether................................ 12.0-28.0 8.3 4.5-35.5 14-186
Chloroform.............................................. 15.0-25.0 4.5 12.4-24.0 49-133
Chloromethane........................................... 11.9-28.1 7.4 D-34.9 D-193
Dibromochloromethane.................................... 13.1-26.9 6.3 7.9-35.1 24-191
1,2-Dichlorobenzene..................................... 14.0-26.0 5.5 1.7-38.9 D-208
1,3-Dichlorobenzene..................................... 9.9-30.1 9.1 6.2-32.6 7-187
1,4-Dichlorobenzene..................................... 13.9-26.1 5.5 11.5-25.5 42-143
1,1-Dichloroethane...................................... 16.8-23.2 3.2 11.2-24.6 47-132
1,2-Dichloroethane...................................... 14.3-25.7 5.2 13.0-26.5 51-147
1,1-Dichloroethene...................................... 12.6-27.4 6.6 10.2-27.3 28-167
trans-1,2-Dichloroethene................................ 12.8-27.2 6.4 11.4-27.1 38-155
1,2-Dichloropropane..................................... 14.8-25.2 5.2 10.1-29.9 44-156
cis-1,3-Dichloropropene................................. 12.8-27.2 7.3 6.2-33.8 22-178
trans-1,3-Dichloropropene............................... 12.8-27.2 7.3 6.2-33.8 22-178
Methylene chloride...................................... 15.5-24.5 4.0 7.0-27.6 25-162
1,1,2,2-Tetrachloroethane............................... 9.8-30.2 9.2 6.6-31.8 8-184
Tetrachloroethene....................................... 14.0-26.0 5.4 8.1-29.6 26-162
1,1,1-Trichloroethane................................... 14.2-25.8 4.9 10.8-24.8 41-138
1,1,2-Trichloroethane................................... 15.7-24.3 3.9 9.6-25.4 39-136
Trichloroethene......................................... 15.4-24.6 4.2 9.2-26.6 35-146
Trichlorofluoromethane.................................. 13.3-26.7 6.0 7.4-28.1 21-156
Vinyl chloride.......................................... 13.7-26.3 5.7 8.2-29.9 28-163
----------------------------------------------------------------------------------------------------------------
\a\ Criteria were calculated assuming a QC check sample concentration of 20 [micro]g/L.
Q=Concentration measured in QC check sample, in [micro]g/L (Section 7.5.3).
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 601
----------------------------------------------------------------------------------------------------------------
Single analyst
Parameter Accuracy, as recovery, precision, sr' Overall precision, S'
X' ([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Bromodichloromethane................ 1.12C-1.02 0.11X+0.04 0.20X+1.00
Bromoform........................... 0.96C-2.05 0.12X+0.58 0.21X+2.41
Bromomethane........................ 0.76C-1.27 0.28X+0.27 0.36X+0.94
Carbon tetrachloride................ 0.98C-1.04 0.15X+0.38 0.20X+0.39
Chlorobenzene....................... 1.00C-1.23 0.15X-0.02 0.18X+1.21
Choroethane......................... 0.99C-1.53 0.14X-0.13 0.17X+0.63
[[Page 73]]
2-Chloroethylvinyl ether \a\........ 1.00C 0.20X 0.35X
Chloroform.......................... 0.93C-0.39 0.13X+0.15 0.19X-0.02
Chloromethane....................... 0.77C+0.18 0.28X-0.31 0.52X+1.31
Dibromochloromethane................ 0.94C+2.72 0.11X+1.10 0.24X+1.68
1,2-Dichlorobenzene................. 0.93C+1.70 0.20X+0.97 0.13X+6.13
1,3-Dichlorobenzene................. 0.95C+0.43 0.14X+2.33 0.26X+2.34
1,4-Dichlorobenzene................. 0.93C-0.09 0.15X+0.29 0.20X+0.41
1,1-Dichloroethane.................. 0.95C-1.08 0.09X+0.17 0.14X+0.94
1,2-Dichloroethane.................. 1.04C-1.06 0.11X+0.70 0.15X+0.94
1,1-Dichloroethene.................. 0.98C-0.87 0.21X-0.23 0.29X-0.40
trans-1,2-Dichloroethene............ 0.97C-0.16 0.11X+1.46 0.17X+1.46
1,2-Dichloropropane \a\............. 1.00C 0.13X 0.23X
cis-1,3-Dichloropropene \a\......... 1.00C 0.18X 0.32X
trans-1,3-Dichloropropene \a\....... 1.00C 0.18X 0.32X
Methylene chloride.................. 0.91C-0.93 0.11X+0.33 0.21X+1.43
1,1,2,2-Tetrachloroethene........... 0.95C+0.19 0.14X+2.41 0.23X+2.79
Tetrachloroethene................... 0.94C+0.06 0.14X+0.38 0.18X+2.21
1,1,1-Trichloroethane............... 0.90C-0.16 0.15X+0.04 0.20X+0.37
1,1,2-Trichloroethane............... 0.86C+0.30 0.13X-0.14 0.19X+0.67
Trichloroethene..................... 0.87C+0.48 0.13X-0.03 0.23X+0.30
Trichlorofluoromethane.............. 0.89C-0.07 0.15X+0.67 0.26X+0.91
Vinyl chloride...................... 0.97C-0.36 0.13X+0.65 0.27X+0.40
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sn'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S\1\=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
\a\ Estimates based upon the performance in a single laboratory. \10\
[[Page 74]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.000
[[Page 75]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.001
[[Page 76]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.002
[[Page 77]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.003
[[Page 78]]
Method 602--Purgeable Aromatics
1. Scope and Application
1.1 This method covers the determination of various purgeable
aromatics. The following parameters may be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Benzene.......................................... 34030 71-43-2
Chlorobenzene.................................... 34301 108-90-7
1,2-Dichlorobenzene.............................. 34536 95-50-1
1,3-Dichlorobenzene.............................. 34566 541-73-1
1,4-Dichlorobenzene.............................. 34571 106-46-7
Ethylbenzene..................................... 34371 100-41-4
Toluene.......................................... 34010 108-88-3
------------------------------------------------------------------------
1.2 This is a purge and trap gas chromatographic (GC) method
applicable to the determination of the compounds listed above in
municipal and industrial discharges as provided under 40 CFR 136.1. When
this method is used to analyze unfamiliar samples for any or all of the
compounds above, compound identifications should be supported by at
least one additional qualitative technique. This method describes
analytical conditions for a second gas chromatographic column that can
be used to confirm measurements made with the primary column. Method 624
provides gas chromatograph/mass spectrometer (GC/MS) conditions
appropriate for the qualitative and quantitative confirmation of results
for all of the parameters listed above.
1.3 The method detection limit (MDL, defined in Section 12.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the operation of a purge and trap system and a
gas chromatograph and in the interpretation of gas chromatograms. Each
analyst must demonstrate the ability to generate acceptable results with
this method using the procedure described in Section 8.2.
2. Summary of Method
2.1 An inert gas is bubbled through a 5-mL water sample contained in
a specially-designed purging chamber at ambient temperature. The
aromatics are efficiently transferred from the aqueous phase to the
vapor phase. The vapor is swept through a sorbent trap where the
aromatics are trapped. After purging is completed, the trap is heated
and backflushed with the inert gas to desorb the aromatics onto a gas
chromatographic column. The gas chromatograph is temperature programmed
to separate the aromatics which are then detected with a photoionization
detector. \2,3\
2.2 The method provides an optional gas chromatographic column that
may be helpful in resolving the compounds of interest from interferences
that may occur.
3. Interferences
3.1 Impurities in the purge gas and organic compounds outgassing
from the plumbing ahead of the trap account for the majority of
contamination problems. The analytical system must be demonstrated to be
free from contamination under the conditions of the analysis by running
laboratory reagent blanks as described in Section 8.1.3. The use of non-
Teflon plastic tubing, non-Teflon thread sealants, or flow controllers
with rubber components in the purge and trap system should be avoided.
3.2 Samples can be contaminated by diffusion of volatile organics
through the septum seal into the sample during shipment and storage. A
field reagent blank prepared from reagent water and carried through the
sampling and handling protocol can serve as a check on such
contamination.
3.3 Contamination by carry-over can occur whenever high level and
low level samples are sequentially analyzed. To reduce carry-over, the
purging device and sample syringe must be rinsed with reagent water
between sample analyses. Whenever an unusually concentrated sample is
encountered, it should be followed by an analysis of reagent water to
check for cross contamination. For samples containing large amounts of
water-soluble materials, suspended solids, high boiling compounds or
high aromatic levels, it may be necessary to wash the purging device
with a detergent solution, rinse it with distilled water, and then dry
it in an oven at 105 [deg]C between analyses. The trap and other parts
of the system are also subject to contamination; therefore, frequent
bakeout and purging of the entire system may be required.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety
[[Page 79]]
are available and have been identified \4,6\ for the information of the
analyst.
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: benzene and 1,4-dichlorobenzene. Primary standards of these
toxic compounds should be prepared in a hood. A NIOSH/MESA approved
toxic gas respirator should be worn when the analyst handles high
concentrations of these toxic compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete sampling.
5.1.1 Vial]25-mL capacity or larger, equipped with a screw cap with
a hole in the center (Pierce 13075 or equivalent). Detergent
wash, rinse with tap and distilled water, and dry at 105 [deg]C before
use.
5.1.2 Septum--Teflon-faced silicone (Pierce 12722 or
equivalent). Detergent wash, rinse with tap and distilled water, and dry
at 105 [deg]C for 1 h before use.
5.2 Purge and trap system--The purge and trap system consists of
three separate pieces of equipment: A purging device, trap, and
desorber. Several complete systems are now commercially available.
5.2.1 The purging device must be designed to accept 5-mL samples
with a water column at least 3 cm deep. The gaseous head space between
the water column and the trap must have a total volume of less than 15
mL. The purge gas must pass through the water column as finely divided
bubbles with a diameter of less than 3 mm at the origin. The purge gas
must be introduced no more than 5 mm from the base of the water column.
The purging device illustrated in Figure 1 meets these design criteria.
5.2.2 The trap must be at least 25 cm long and have an inside
diameter of at least 0.105 in.
5.2.2.1 The trap is packed with 1 cm of methyl silicone coated
packing (Section 6.4.2) and 23 cm of 2,6-diphenylene oxide polymer
(Section 6.4.1) as shown in Figure 2. This trap was used to develop the
method performance statements in Section 12.
5.2.2.2 Alternatively, either of the two traps described in Method
601 may be used, although water vapor will preclude the measurement of
low concentrations of benzene.
5.2.3 The desorber must be capable of rapidly heating the trap to
180 [deg]C. The polymer section of the trap should not be heated higher
than 180 [deg]C and the remaining sections should not exceed 200 [deg]C.
The desorber illustrated in Figure 2 meets these design criteria.
5.2.4 The purge and trap system may be assembled as a separate unit
or be coupled to a gas chromatograph as illustrated in Figures 3, 4, and
5.
5.3 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, gases, detector, and strip-chart recorder. A data system is
recommended for measuring peak areas.
5.3.1 Column 1--6 ft long x 0.082 in. ID stainless steel or glass,
packed with 5% SP-1200 and 1.75% Bentone-34 on Supelcoport (100/120
mesh) or equivalent. This column was used to develop the method
performance statements in Section 12. Guidelines for the use of
alternate column packings are provided in Section 10.1.
5.3.2 Column 2--8 ft long x 0.1 in ID stainless steel or glass,
packed with 5% 1,2,3-Tris(2-cyanoethoxy)propane on Chromosorb W-AW (60/
80 mesh) or equivalent.
5.3.3 Detector--Photoionization detector (h-Nu Systems, Inc. Model
PI-51-02 or equivalent). This type of detector has been proven effective
in the analysis of wastewaters for the parameters listed in the scope
(Section 1.1), and was used to develop the method performance statements
in Section 12. Guidelines for the use of alternate detectors are
provided in Section 10.1.
5.4 Syringes--5-mL glass hypodermic with Luerlok tip (two each), if
applicable to the purging device.
5.5 Micro syringes--25-[micro]L, 0.006 in. ID needle.
5.6 Syringe valve--2-way, with Luer ends (three each).
5.7 Bottle--15-mL, screw-cap, with Teflon cap liner.
5.8 Balance--Analytical, capable of accurately weighing 0.0001 g.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.1.1 Reagent water can be generated by passing tap water through a
carbon filter bed containing about 1 lb of activated carbon (Filtrasorb-
300, Calgon Corp., or equivalent).
6.1.2 A water purification system (Millipore Super-Q or equivalent)
may be used to generate reagent water.
6.1.3 Reagent water may also be prepared by boiling water for 15
min. Subsequently, while maintaining the temperature at 90 [deg]C,
bubble a contaminant-free inert gas through the water for 1 h. While
still hot, transfer the water to a narrow mouth screw-cap bottle and
seal with a Teflon-lined septum and cap.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Hydrochloric acid (1+1)--Add 50 mL of concentrated HCl (ACS) to
50 mL of reagent water.
6.4 Trap Materials:
[[Page 80]]
6.4.1 2,6-Diphenylene oxide polymer--Tenax, (60/80 mesh),
chromatographic grade or equivalent.
6.4.2 Methyl silicone packing--3% OV-1 on Chromosorb-W (60/80 mesh)
or equivalent.
6.5 Methanol--Pesticide quality or equivalent.
6.6 Stock standard solutions--Stock standard solutions may be
prepared from pure standard materials or purchased as certified
solutions. Prepare stock standard solutions in methanol using assayed
liquids. Because of the toxicity of benzene and 1,4-dichlorobenzene,
primary dilutions of these materials should be prepared in a hood. A
NIOSH/MESA approved toxic gas respirator should be used when the analyst
handles high concentrations of such materials.
6.6.1 Place about 9.8 mL of methanol into a 10-mL ground glass
stoppered volumetric flask. Allow the flask to stand, unstoppered, for
about 10 min or until all alcohol wetted surfaces have dried. Weigh the
flask to the nearest 0.1 mg.
6.6.2 Using a 100-[micro]L syringe, immediately add two or more
drops of assayed reference material to the flask, then reweigh. Be sure
that the drops fall directly into the alcohol without contacting the
neck of the flask.
6.6.3 Reweigh, dilute to volume, stopper, then mix by inverting the
flask several times. Calculate the concentration in [micro]g/[micro]L
from the net gain in weight. When compound purity is assayed to be 96%
or greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.6.4 Transfer the stock standard solution into a Teflon-sealed
screw-cap bottle. Store at 4 [deg]C and protect from light.
6.6.5 All standards must be replaced after one month, or sooner if
comparison with check standards indicates a problem.
6.7 Secondary dilution standards--Using stock standard solutions,
prepare secondary dilution standards in methanol that contain the
compounds of interest, either singly or mixed together. The secondary
dilution standards should be prepared at concentrations such that the
aqueous calibration standards prepared in Section 7.3.1 or 7.4.1 will
bracket the working range of the analytical system. Secondary solution
standards must be stored with zero headspace and should be checked
frequently for signs of degradation or evaporation, especially just
prior to preparing calibration standards from them.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Assemble a purge and trap system that meets the specifications
in Section 5.2. Condition the trap overnight at 180 [deg]C by
backflushing with an inert gas flow of at least 20 mL/min. Condition the
trap for 10 min once daily prior to use.
7.2 Connect the purge and trap system to a gas chromatograph. The
gas chromatograph must be operated using temperature and flow rate
conditions equivalent to those given in Table 1. Calibrate the purge and
trap-gas chromatographic system using either the external standard
technique (Section 7.3) or the internal standard technique (Section
7.4).
7.3 External standard calibration procedure:
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter by carefully adding 20.0
[micro]L of one or more secondary dilution standards to 100, 500, or
1000 mL of reagent water. A 25-[micro]L syringe with a 0.006 in. ID
needle should be used for this operation. One of the external standards
should be at a concentration near, but above, the MDL (Table 1) and the
other concentrations should correspond to the expected range of
concentrations found in real samples or should define the working range
of the detector. These aqueous standards must be prepared fresh daily.
7.3.2 Analyze each calibration standard according to Section 10, and
tabulate peak height or area responses versus the concentration in the
standard. The results can be used to prepare a calibration curve for
each compound. Alternatively, if the ratio of response to concentration
(calibration factor) is a constant over the working range (<10% relative
standard deviation, RSD), linearity through the origin can be assumed
and the average ratio or calibration factor can be used in place of a
calibration curve.
7.4 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples. The compound, [alpha],[alpha],[alpha],-trifluorotoluene,
recommended as a surrogate spiking compound in Section 8.7 has been used
successfully as an internal standard.
7.4.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest as described in
Section 7.3.1.
7.4.2 Prepare a spiking solution containing each of the internal
standards using the procedures described in Sections 6.6 and 6.7. It is
recommended that the secondary dilution standard be prepared at a
concentration of 15 [micro]g/mL of each internal standard compound. The
addition of 10 [micro]l of this
[[Page 81]]
standard to 5.0 mL of sample or calibration standard would be equivalent
to 30 [micro]g/L.
7.4.3 Analyze each calibration standard according to Section 10,
adding 10 [micro]L of internal standard spiking solution directly to the
syringe (Section 10.4). Tabulate peak height or area responses against
concentration for each compound and internal standard, and calculate
response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard
Cs=Concentration of the parameter to be measured.
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.5 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of a QC check sample.
7.5.1 Prepare the QC check sample as described in Section 8.2.2.
7.5.2 Analyze the QC check sample according to Section 10.
7.5.3 For each parameter, compare the response (Q) with the
corresponding calibration acceptance criteria found in Table 2. If the
responses for all parameters of interest fall within the designated
ranges, analysis of actual samples can begin. If any individual Q falls
outside the range, a new calibration curve, calibration factor, or RF
must be prepared for that parameter according to Section 7.3 or 7.4.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The mimimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Section 10.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Each day, the analyst must analyze a reagent water blank to
demonstrate that interferences from the analytical system are under
control.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 10 [micro]g/
mL in methanol. The QC check sample concentrate must be obtained from
the U.S. Environmental Protection Agency, Environmental Monitoring and
Support Laboratory in Cincinnati, Ohio, if available. If not available
from that source, the QC check sample concentrate must be obtained from
another external source. If not available from either source above, the
QC check sample concentrate must be prepared by the laboratory using
stock standards prepared independently from those used for calibration.
8.2.2 Prepare a QC check sample to contain 20 [micro]g/L of each
parameter by adding 200 [micro]L of QC check sample concentrate to 100
mL of reagant water.
8.2.3 Analyze four 5-mL aliquots of the well-mixed QC check sample
according to Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
of interest using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively,
[[Page 82]]
found in Table 2. If s and X for all parameters of interest meet the
acceptance criteria, the system performance is acceptable and analysis
of actual samples can begin. If any individual s exceeds the precision
limit or any individual X falls outside the range for accuracy, the
system performance is unacceptable for that parameter.
Note: The large number of parameters in Table 2 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.3.
8.2.6.2 Beginning with Section 8.2.3, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.3.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 20 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.2 Analyze one 5-mL sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second 5-mL sample aliquot with 10
[micro]L of the QC check sample concentrate and analyze it to determine
the concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\ If spiking was performed at a concentration lower than 20 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 2, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 3, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 3,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T) 2.44(100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 10 [micro]L of QC
check sample concentrate (Section 8.2.1 or 8.3.2) to 5 mL of reagent
water. The QC check standard needs only to contain the parameters that
failed criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P)
[[Page 83]]
and the standard deviation of the percent recovery (sp).
Express the accuracy assessment as a percent recovery interval from P-
2sp to P+2sp. If P=90% and sp=10%, for
example, the accuracy interval is expressed as 70-110%. Update the
accuracy assessment for each parameter on a regular basis (e.g. after
each five to ten new accuracy measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
8.7 The analyst should monitor both the performance of the
analytical system and the effectiveness of the method in dealing with
each sample matrix by spiking each sample, standard, and reagent water
blank with surrogate compounds (e.g. [alpha], [alpha], [alpha],-
trifluorotoluene) that encompass the range of the temperature program
used in this method. From stock standard solutions prepared as in
Section 6.6, add a volume to give 750 [micro]g of each surrogate to 45
mL of reagent water contained in a 50-mL volumetric flask, mix and
dilute to volume for a concentration of 15 mg/[micro]L. Add 10 [micro]L
of this surrogate spiking solution directly into the 5-mL syringe with
every sample and reference standard analyzed. Prepare a fresh surrogate
spiking solution on a weekly basis. If the internal standard calibration
procedure is being used, the surrogate compounds may be added directly
to the internal standard spiking solution (Section 7.4.2).
9. Sample Collection, Preservation, and Handling
9.1 The samples must be iced or refrigerated from the time of
collection until analysis. If the sample contains free or combined
chlorine, add sodium thiosulfate preservative (10 mg/40 mL is sufficient
for up to 5 ppm Cl2) to the empty sample bottle just prior to
shipping to the sampling site. EPA Method 330.4 or 330.5 may be used for
measurement of residual chlorine. \8\ Field test kits are available for
this purpose.
9.2 Collect about 500 mL of sample in a clean container. Adjust the
pH of the sample to about 2 by adding 1+1 HCl while stirring. Fill the
sample bottle in such a manner that no air bubbles pass through the
sample as the bottle is being filled. Seal the bottle so that no air
bubbles are entrapped in it. Maintain the hermetic seal on the sample
bottle until time of analysis.
9.3 All samples must be analyzed within 14 days of collection. \3\
10. Procedure
10.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are estimated retention times
and MDL that can be achieved under these conditions. An example of the
separations achieved by Column 1 is shown in Figure 6. Other packed
columns, chromatographic conditions, or detectors may be used if the
requirements of Section 8.2 are met.
10.2 Calibrate the system daily as described in Section 7.
10.3 Adjust the purge gas (nitrogen or helium) flow rate to 40 mL/
min. Attach the trap inlet to the purging device, and set the purge and
trap system to purge (Figure 3). Open the syringe valve located on the
purging device sample introduction needle.
10.4 Allow the sample to come to ambient temperature prior to
introducing it to the syringe. Remove the plunger from a 5-mL syringe
and attach a closed syringe valve. Open the sample bottle (or standard)
and carefully pour the sample into the syringe barrel to just short of
overflowing. Replace the syringe plunger and compress the sample. Open
the syringe valve and vent any residual air while adjusting the sample
volume to 5.0 mL. Since this process of taking an aliquot destroys the
validity of the sample for future analysis, the analyst should fill a
second syringe at this time to protect against possible loss of data.
Add 10.0 [micro]L of the surrogate spiking solution (Section 8.7) and
10.0 [micro]L of the internal standard spiking solution (Section 7.4.2),
if applicable, through the valve bore, then close the valve.
10.5 Attach the syringe-syringe valve assembly to the syringe valve
on the purging device. Open the syringe valves and inject the sample
into the purging chamber.
10.6 Close both valves and purge the sample for 12.0 0.1 min at ambient temperature.
10.7 After the 12-min purge time, disconnect the purging device from
the trap. Dry the trap by maintaining a flow of 40 mL/min of dry purge
gas through it for 6 min (Figure 4). If the purging device has no
provision for bypassing the purger for this step, a dry purger should be
inserted into the device to minimize moisture in the gas. Attach the
trap to the chromatograph, adjust the purge and trap system to the
desorb mode (Figure 5), and begin to temperature program the gas
chromatograph. Introduce the trapped materials to the GC column by
rapidly heating the trap to 180 [deg]C while backflushing the trap with
an inert gas between 20 and 60 mL/min for 4 min. If rapid heating of the
trap cannot be achieved, the GC column must be used as
[[Page 84]]
a secondary trap by cooling it to 30 [deg]C (subambient temperature, if
poor peak geometry and random retention time problems persist) instead
of the initial program temperature of 50 [deg]C.
10.8 While the trap is being desorbed into the gas chromatograph
column, empty the purging chamber using the sample introduction syringe.
Wash the chamber with two 5-mL flushes of reagent water.
10.9 After desorbing the sample for 4 min, recondition the trap by
returning the purge and trap system to the purge mode. Wait 15 s, then
close the syringe valve on the purging device to begin gas flow through
the trap. The trap temperature should be maintained at 180 [deg]C. After
approximately 7 min, turn off the trap heater and open the syringe valve
to stop the gas flow through the trap. When the trap is cool, the next
sample can be analyzed.
10.10 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
10.11 If the response for a peak exceeds the working range of the
system, prepare a dilution of the sample with reagent water from the
aliquot in the second syringe and reanalyze.
11. Calculations
11.1 Determine the concentration of individual compounds in the
sample.
11.1.1 If the external standard calibration procedure is used,
calculate the concentration of the parameter being measured from the
peak response using the calibration curve or calibration factor
determined in Section 7.3.2.
11.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.4.3 and Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.096
Equation 2
where:
As = Response for the parameter to be measured.
Ais = Response for the internal standard.
Cis = Concentration of the internal standard.
11.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
12. Method Performance
12.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \9\ Similar results
were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
12.2 This method has been demonstrated to be applicable for the
concentration range from the MDL to 100 x MDL. \9\ Direct aqueous
injection techniques should be used to measure concentration levels
above 1000 x MDL.
12.3 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 2.1 to 550 [micro]g/L. \9\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. Lichtenberg, J.J. ``Determining Volatile Organics at Microgram-
per-Litre-Levels by Gas Chromatography,'' Journal American Water Works
Association, 66, 739 (1974).
3. Bellar, T.A., and Lichtenberg, J.J. ``Semi-Automated Headspace
Analysis of Drinking Waters and Industrial Waters for Purgeable Volatile
Organic Compounds,'' Proceedings of Symposium on Measurement of Organic
Pollutants in Water and Wastewater. American Society for Testing and
Materials, STP 686, C.E. Van Hall, editor, 1978.
4. ``Carcinogens--Working with Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health.
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3. is two times the value 1.22
derived in this report.)
[[Page 85]]
8.``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Office of Research and Development,
Environmental Monitoring and Support Laboratory, Cincinnati, Ohio 45268.
March 1979.
9. ``EPA Method Study 25, Method 602, Purgeable Aromatics,'' EPA
600/4-84-042, National Technical Information Service, PB84-196682,
Springfield, Virginia 22161, May 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
---------------------- detection
Parameter limit
Column 1 Column 2 ([micro]g/
L)
------------------------------------------------------------------------
Benzene............................... 3.33 2.75 0.2
Toluene............................... 5.75 4.25 0.2
Ethylbenzene.......................... 8.25 6.25 0.2
Chlorobenzene......................... 9.17 8.02 0.2
1,4-Dichlorobenzene................... 16.8 16.2 0.3
1,3-Dichlorobenzene................... 18.2 15.0 0.4
1,2-Dichlorobenzene................... 25.9 19.4 0.4
------------------------------------------------------------------------
Column 1 conditions: Supelcoport (100/120 mesh) coated with 5% SP-1200/
1.75% Bentone-34 packed in a 6 ft x 0.085 in. ID stainless steel
column with helium carrier gas at 36 mL/min flow rate. Column
temperature held at 50 [deg]C for 2 min then programmed at 6 [deg]C/
min to 90 [deg]C for a final hold.
Column 2 conditions: Chromosorb W-AW (60/80 mesh) coated with 5% 1,2,3-
Tris(2-cyanoethyoxy)propane packed in a 6 ft x 0.085 in. ID stainless
steel column with helium carrier gas at 30 mL/min flow rate. Column
temperature held at 40 [deg]C for 2 min then programmed at 2 [deg]C/
min to 100 [deg]C for a final hold.
Table 2--Calibration and QC Acceptance Criteria--Method 602 \a\
----------------------------------------------------------------------------------------------------------------
Limit for Range for X
Range for Q s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/ L) P, Ps(%)
L) L)
----------------------------------------------------------------------------------------------------------------
Benzene........................................................ 15.4-24.6 4.1 10.0-27.9 39-150
Chlorobenzene.................................................. 16.1-23.9 3.5 12.7-25.4 55-135
1,2-Dichlorobenzene............................................ 13.6-26.4 5.8 10.6-27.6 37-154
1,3-Dichlorobenzene............................................ 14.5-25.5 5.0 12.8-25.5 50-141
1,4-Dichlorobenzene............................................ 13.9-26.1 5.5 11.6-25.5 42-143
Ethylbenzene................................................... 12.6-27.4 6.7 10.0-28.2 32-160
Toluene........................................................ 15.5-24.5 4.0 11.2-27.7 46-148
----------------------------------------------------------------------------------------------------------------
Q=Concentration measured in QC check sample, in [micro]g/L (Section 7.5.3).
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
Ps, P=Percent recovery measured (Section 8.3.2, Section 8.4.2).
\a\ Criteria were calculated assuming a QC check sample concentration of 20 [micro]g/L.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the
limits for recovery have been broadened to assure applicability of the limits to concentrations below those
used to develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 602
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, s' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Benzene......................................................... 0.92C+0.57 0.09X+0.59 0.21X+0.56
Chlorobenzene................................................... 0.95C+0.02 0.09X+0.23 0.17X+0.10
1,2-Dichlorobenzene............................................. 0.93C+0.52 0.17X-0.04 0.22X+0.53
1,3-Dichlorobenzene............................................. 0.96C-0.05 0.15X-0.10 0.19X+0.09
1,4-Dichlorobenzene............................................. 0.93C-0.09 0.15X+0.28 0.20X+0.41
Ethylbenzene.................................................... 0.94C+0.31 0.17X+0.46 0.26X+0.23
Toluene......................................................... 0.94C+0.65 0.09X+0.48 0.18X+0.71
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
S'=Expected single analyst standard deviation of measurements at an average concentration found of X, in X
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the Concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 86]]
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[GRAPHIC] [TIFF OMITTED] TC02JY92.005
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[GRAPHIC] [TIFF OMITTED] TC02JY92.007
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Method 603--Acrolein and Acrylonitrile
1. Scope and Application
1.1 This method covers the determination of acrolein and
acrylonitrile. The following parameters may be determined by this
method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Acrolein......................................... 34210 107-02-8
Acrylonitrile.................................... 34215 107-13-1
------------------------------------------------------------------------
1.2 This is a purge and trap gas chromatographic (GC) method
applicable to the determination of the compounds listed above in
municipal and industrial discharges as provided under 40 CFR 136.1. When
this method is used to analyze unfamiliar samples for either or both of
the compounds above, compound identifications should be supported by at
least one additional qualitative technique. This method describes
analytical conditions for a second gas chromatographic column that can
be used to confirm measurements made with the primary column. Method 624
provides gas chromatograph/mass spectrometer (GC/MS) conditions
appropriate for the qualitative and quantitative confirmation of results
for the parameters listed above, if used with the purge and trap
conditions described in this method.
1.3 The method detection limit (MDL, defined in Section 12.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the operation of a purge and trap system and a
gas chromatograph and in the interpretation of gas chromatograms. Each
analyst must demonstrate the ability to generate acceptable results with
this method using the procedure described in Section 8.2.
2. Summary of Method
2.1 An inert gas is bubbled through a 5-mL water sample contained in
a heated purging chamber. Acrolein and acrylonitrile are transferred
from the aqueous phase to the vapor phase. The vapor is swept through a
sorbent trap where the analytes are trapped. After the purge is
completed, the trap is heated and backflushed with the inert gas to
desorb the compound onto a gas chromatographic column. The gas
chromatograph is temperature programmed to separate the analytes which
are then detected with a flame ionization detector. \2,3\
2.2 The method provides an optional gas chromatographic column that
may be helpful in resolving the compounds of interest from the
interferences that may occur.
3. Interferences
3.1 Impurities in the purge gas and organic compound outgassing from
the plumbing of the trap account for the majority of contamination
problems. The analytical system must be demonstrated to be free from
contamination under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3. The use of non-Teflon
plastic tubing, non-Teflon thread sealants, or flow controllers with
rubber components in the purge and trap system should be avoided.
3.2 Samples can be contaminated by diffusion of volatile organics
through the septum seal into the sample during shipment and storage. A
field reagent blank prepared from reagent water and carried through the
sampling and handling protocol can serve as a check on such
contamination.
3.3 Contamination by carry-over can occur whenever high level and
low level samples are sequentially analyzed. To reduce carry-over, the
purging device and sample syringe must be rinsed between samples with
reagent water. Whenever an unusually concentrated sample is encountered,
it should be followed by an analysis of reagent water to check for cross
contamination. For samples containing large amounts of water-soluble
materials, suspended solids, high boiling compounds or high analyte
levels, it may be necessary to wash the purging device with a detergent
solution, rinse it with distilled water, and then dry it in an oven at
105 [deg]C between analyses. The trap and other parts of the system are
also subject to contamination, therefore, frequent bakeout and purging
of the entire system may be required.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this view point,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \4,6\ for
the information of the analyst.
[[Page 91]]
5. Apparatus and Materials
5.1 Sampling equipment, for discrete sampling.
5.1.1 Vial--25-mL capacity or larger, equipped with a screw cap with
a hole in the center (Pierce 13075 or equivalent). Detergent
wash, rinse with tap and distilled water, and dry at 105 [deg]C before
use.
5.1.2 Septum--Teflon-faced silicone (Pierce 12722 or
equivalent). Detergent wash, rinse with tap and distilled water and dry
at 105 [deg]C for 1 h before use.
5.2 Purge and trap system--The purge and trap system consists of
three separate pieces of equipment: a purging device, trap, and
desorber. Several complete systems are now commercially available.
5.2.1 The purging device must be designed to accept 5-mL, samples
with a water column at least 3 cm deep. The gaseous head space between
the water column and the trap must have a total volume of less than 15
mL. The purge gas must pass through the water column as finely divided
bubbles with a diameter of less than 3 mm at the origin. The purge gas
must be introduced no more than 5 mm from the base of the water column.
The purging device must be capable of being heated to 85 [deg]C within
3.0 min after transfer of the sample to the purging device and being
held at 85 2 [deg]C during the purge cycle. The
entire water column in the purging device must be heated. Design of this
modification to the standard purging device is optional, however, use of
a water bath is suggested.
5.2.1.1 Heating mantle--To be used to heat water bath.
5.2.1.2 Temperature controller--Equipped with thermocouple/sensor to
accurately control water bath temperature to 2
[deg]C. The purging device illustrated in Figure 1 meets these design
criteria.
5.2.2 The trap must be at least 25 cm long and have an inside
diameter of at least 0.105 in. The trap must be packed to contain 1.0 cm
of methyl silicone coated packing (Section 6.5.2) and 23 cm of 2,6-
diphenylene oxide polymer (Section 6.5.1). The minimum specifications
for the trap are illustrated in Figure 2.
5.2.3 The desorber must be capable of rapidly heating the trap to
180 [deg]C, The desorber illustrated in Figure 2 meets these design
criteria.
5.2.4 The purge and trap system may be assembled as a separate unit
as illustrated in Figure 3 or be coupled to a gas chromatograph.
5.3 pH paper--Narrow pH range, about 3.5 to 5.5 (Fisher Scientific
Short Range Alkacid No. 2, 14-837-2 or equivalent).
5.4 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, gases, detector, and strip-chart recorder. A data system is
recommended for measuring peak areas.
5.4.1 Column 1--10 ft long x 2 mm ID glass or stainless steel,
packed with Porapak-QS (80/100 mesh) or equivalent. This column was used
to develop the method performance statements in Section 12. Guidelines
for the use of alternate column packings are provided in Section 10.1.
5.4.2 Column 2--6 ft long x 0.1 in. ID glass or stainless steel,
packed with Chromosorb 101 (60/80 mesh) or equivalent.
5.4.3 Detector--Flame ionization detector. This type of detector has
proven effective in the analysis of wastewaters for the parameters
listed in the scope (Section 1.1), and was used to develop the method
performance statements in Section 12. Guidelines for the use of
alternate detectors are provided in Section 10.1.
5.5 Syringes--5-mL, glass hypodermic with Luerlok tip (two each).
5.6 Micro syringes--25-[micro]L, 0.006 in. ID needle.
5.7 Syringe valve--2-way, with Luer ends (three each).
5.8 Bottle--15-mL, screw-cap, with Teflon cap liner.
5.9 Balance--Analytical, capable of accurately weighing 0.0001 g.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.1.1 Reagent water can be generated by passing tap water through a
carbon filter bed containing about 1 lb of activated carbon (Filtrasorb-
300, Calgon Corp., or equivalent).
6.1.2 A water purification system (Millipore Super-Q or equivalent)
may be used to generate reagent water.
6.1.3 Regent water may also be prepared by boiling water for 15 min.
Subsequently, while maintaining the temperature at 90 [deg]C, bubble a
contaminant-free inert gas through the water for 1 h. While still hot,
transfer the water to a narrow mouth screw-cap bottle and seal with a
Teflon-lined septum and cap.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.4 Hydrochloric acid (1+1)--Slowly, add 50 mL of concentrated HCl
(ACS) to 50 mL of reagent water.
6.5 Trap Materials:
6.5.1 2,6-Diphenylene oxide polymer--Tenax (60/80 mesh),
chromatographic grade or equivalent.
6.5.2 Methyl silicone packing--3% OV-1 on Chromosorb-W (60/80 mesh)
or equivalent.
[[Page 92]]
6.6 Stock standard solutions--Stock standard solutions may be
prepared from pure standard materials or purchased as certified
solutions. Prepare stock standard solutions in reagent water using
assayed liquids. Since acrolein and acrylonitrile are lachrymators,
primary dilutions of these compounds should be prepared in a hood. A
NIOSH/MESA approved toxic gas respirator should be used when the analyst
handles high concentrations of such materials.
6.6.1 Place about 9.8 mL of reagent water into a 10-mL ground glass
stoppered volumetric flask. For acrolein standards the reagent water
must be adjusted to pH 4 to 5. Weight the flask to the nearest 0.1 mg.
6.6.2 Using a 100-[micro]L syringe, immediately add two or more
drops of assayed reference material to the flask, then reweigh. Be sure
that the drops fall directly into the water without contacting the neck
of the flask.
6.6.3 Reweigh, dilute to volume, stopper, then mix by inverting the
flask several times. Calculate the concentration in [micro]g/[micro]L
from the net gain in weight. When compound purity is assayed to be 96%
or greater, the weight can be used without correction to calculate the
concentration of the stock staldard. Optionally, stock standard
solutions may be prepared using the pure standard material by
volumetrically measuring the appropriate amounts and determining the
weight of the material using the density of the material. Commercially
prepared stock standards may be used at any concentration if they are
certified by the manufactaurer or by an independent source.
6.6.4 Transfer the stock standard solution into a Teflon-sealed
screw-cap bottle. Store at 4 [deg]C and protect from light.
6.6.5 Prepare fresh standards daily.
6.7 Secondary dilution standards--Using stock standard solutions,
prepare secondary dilution standards in reagent water that contain the
compounds of interest, either singly or mixed together. The secondary
dilution standards should be prepared at concentrations such that the
aqueous calibration standards prepared in Section 7.3.1 or 7.4.1 will
bracket the working range of the analytical system. Secondary dilution
standards should be prepared daily and stored at 4 [deg]C.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Assemble a purge and trap system that meets the specifications
in Section 5.2. Condition the trap overnight at 180 [deg]C by
backflushing with an inert gas flow of at least 20 mL/min. Condition the
trap for 10 min once daily prior to use.
7.2 Connect the purge and trap system to a gas chromatograph. The
gas chromatograph must be operated using temperature and flow rate
conditions equivalent to those given in Table 1. Calibrate the purge and
trap-gas chromatographic system using either the external standard
technique (Section 7.3) or the internal standard technique (Section
7.4).
7.3 External standard calibration procedure:
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter by carefully adding 20.0
[micro]L of one or more secondary dilution standards to 100, 500, or
1000 mL of reagent water. A 25-[micro]L syringe with a 0.006 in. ID
needle should be used for this operation. One of the external standards
should be at a concentration near, but above, the MDL and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector. These standards must be prepared fresh daily.
7.3.2 Analyze each calibration standard according to Section 10, and
tabulate peak height or area responses versus the concentration of the
standard. The results can be used to prepare a calibration curve for
each compound. Alternatively, if the ratio of response to concentration
(calibration factor) is a constant over the working range (< 10%
relative standard deviation, RSD), linearity through the origin can be
assumed and the average ratio or calibration factor can be used in place
of a calibration curve.
7.4 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.4.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest as described in
Section 7.3.1.
7.4.2 Prepare a spiking solution containing each of the internal
standards using the procedures described in Sections 6.6 and 6.7. It is
recommended that the secondary dilution standard be prepared at a
concentration of 15 [micro]g/mL of each internal standard compound. The
addition of 10 [micro]L of this standard to 5.0 mL of sample or
calibration standard would be equivalent to 30 [micro]g/L.
7.4.3 Analyze each calibration standard according to Section 10,
adding 10 [micro]L of internal standard spiking solution directly to the
syringe (Section 10.4). Tabulate peak height or area responses against
concentration for each compound and internal standard, and calculate
response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
[[Page 93]]
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard.
Cs=Concentration of the parameter to be measured.
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.5 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of a QC check sample.
7.5.1 Prepare the QC check sample as described in Section 8.2.2.
7.5.2 Analyze the QC check sample according to Section 10.
7.5.3 For each parameter, compare the response (Q) with the
corresponding calibration acceptance criteria found in Table 2. If the
responses for all parameters of interest fall within the designated
ranges, analysis of actual samples can begin. If any individual Q falls
outside the range, a new calibration curve, calibration factor, or RF
must be prepared for that parameter according to Section 7.3 or 7.4.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Section 10.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Each day, the analyst must analyze a reagent water blank to
demonstrate that interferences from the analytical system are under
control.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 25 [micro]g/
mL in reagent water. The QC check sample concentrate must be obtained
from the U.S. Environmental Protection Agency, Environmental Monitoring
and Support Laboratory in Cincinnati, Ohio, if available. If not
available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Prepare a QC check sample to contain 50 [micro]g/L of each
parameter by adding 200 [micro]L of QC check sample concentrate to 100
mL of reagent water.
8.2.3 Analyze four 5-mL aliquots of the well-mixed QC check sample
according to Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 3. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If either s exceeds the precision limit or X falls
outside the range for accuracy, the system performance is unacceptable
for that parameter. Locate and correct the source of the problem and
repeat the test for each compound of interest.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to
[[Page 94]]
ten samples per month, at least one spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 50 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.2 Analyze one 5-mL sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second 5-mL sample aliquot with 10
[micro]L of the QC check sample concentrate and analyze it to determine
the concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 3. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 10 [micro]L of QC
check sample concentrate (Section 8.2.1 or 8.3.2) to 5 mL of reagent
water. The QC check standard needs only to contain the parameters that
failed criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
3. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column or mass spectrometer
must be used. Whenever possible, the laboratory should analyze standard
reference materials and participate in relevant performance evaluation
studies.
9. Sample Collection, Preservation, and Handling
9.1 All samples must be iced or refrigerated from the time of
collection until analysis. If the sample contains free or combined
chlorine, add sodium thiosulfate preservative (10 mg/40 mL is sufficient
for up to 5 ppm Cl2) to the empty sample bottle just prior to
shipping to the sampling site. EPA Methods 330.4 and 330.5 may be used
for measurement of residual chlorine. \8\ Field test kits are available
for this purpose.
9.2 If acrolein is to be analyzed, collect about 500 mL of sample in
a clean glass container. Adjust the pH of the sample to 4 to 5 using
acid or base, measuring with narrow range pH paper. Samples for acrolein
analysis receiving no pH adjustment must be analyzed within 3 days of
sampling.
9.3 Grab samples must be collected in glass containers having a
total volume of at
[[Page 95]]
least 25 mL. Fill the sample bottle just to overflowing in such a manner
that no air bubbles pass through the sample as the bottle is being
filled. Seal the bottle so that no air bubbles are entrapped in it. If
preservative has been added, shake vigorously for 1 min. Maintain the
hermetic seal on the sample bottle until time of analysis.
9.4 All samples must be analyzed within 14 days of collection. \3\
10. Procedure
10.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are estimated retention times
and MDL that can be achieved under these conditions. An example of the
separations achieved by Column 1 is shown in Figure 5. Other packed
columns, chromatographic conditions, or detectors may be used if the
requirements of Section 8.2 are met.
10.2 Calibrate the system daily as described in Section 7.
10.3 Adjust the purge gas (nitrogen or helium) flow rate to 20 mL-
min. Attach the trap inlet to the purging device, and set the purge and
trap system to purge (Figure 3). Open the syringe valve located on the
purging device sample introduction needle.
10.4 Remove the plunger from a 5-mL syringe and attach a closed
syringe valve. Open the sample bottle (or standard) and carefully pour
the sample into the syringe barrel to just short of overflowing. Replace
the syringe plunger and compress the sample. Open the syringe valve and
vent any residual air while adjusting the sample volume to 5.0 mL. Since
this process of taking an aliquot destroys the validity of the sample
for future analysis, the analyst should fill a second syringe at this
time to protect against possible loss of data. Add 10.0 [micro]L of the
internal standard spiking solution (Section 7.4.2), if applicable,
through the valve bore then close the valve.
10.5 Attach the syringe-syringe valve assembly to the syringe valve
on the purging device. Open the syringe valves and inject the sample
into the purging chamber.
10.6 Close both valves and purge the sample for 15.0 0.1 min while heating at 85 2
[deg]C.
10.7 After the 15-min purge time, attach the trap to the
chromatograph, adjust the purge and trap system to the desorb mode
(Figure 4), and begin to temperature program the gas chromatograph.
Introduce the trapped materials to the GC column by rapidly heating the
trap to 180 [deg]C while backflushing the trap with an inert gas between
20 and 60 mL/min for 1.5 min.
10.8 While the trap is being desorbed into the gas chromatograph,
empty the purging chamber using the sample introduction syringe. Wash
the chamber with two 5-mL flushes of reagent water.
10.9 After desorbing the sample for 1.5 min, recondition the trap by
returning the purge and trap system to the purge mode. Wait 15 s then
close the syringe valve on the purging device to begin gas flow through
the trap. The trap temperature should be maintained at 210 [deg]C. After
approximately 7 min, turn off the trap heater and open the syringe valve
to stop the gas flow through the trap. When the trap is cool, the next
sample can be analyzed.
10.10 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
11. Calculations
11.1 Determine the concentration of individual compounds in the
sample.
11.1.1 If the external standard calibration procedure is used,
calculate the concentration of the parameter being measured from the
peak response using the calibration curve or calibration factor
determined in Section 7.3.2.
11.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.4.3 and Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.097
Equation 2
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard.
11.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
12. Method Performance
12.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \9\ The MDL
actually achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
[[Page 96]]
12.2 This method is recommended for the concentration range from the
MDL to 1,000xMDL. Direct aqueous injection techniques should be used to
measure concentration levels above 1,000xMDL.
12.3 In a single laboratory (Battelle-Columbus), the average
recoveries and standard deviations presented in Table 2 were obtained.
\9\ Seven replicate samples were analyzed at each spike level.
References
1. 40 CFR part 136, appendix B.
2. Bellar, T.A., and Lichtenberg, J.J. ``Determining Volatile
Organics at Microgram-per-Litre-Levels by Gas Chromatography,'' Journal
American Water Works Association, 66, 739 (1974).
3. ``Evaluate Test Procedures for Acrolein and Acrylonitrile,''
Special letter report for EPA Project 4719-A, U.S. Environmental
Protection Agency, Environmental Monitoring and Support Laboratory,
Cincinnati, Ohio 45268, 27 June 1979.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983).
8. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
9. ``Evaluation of Method 603 (Modified),'' EPA-600/4-84-ABC,
National Technical Information Service, PB84-, Springfield, Virginia
22161, Nov. 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
------------------------ detection
Parameter limit
Column 1 Column 2 ([micro]g/
L)
------------------------------------------------------------------------
Acrolein............................ 10.6 8.2 0.7
Acrylonitrile....................... 12.7 9.8 0.5
------------------------------------------------------------------------
Column 1 conditions: Porapak-QS (80/100 mesh) packed in a 10 ft x 2 mm
ID glass or stainless steel column with helium carrier gas at 30 mL/
min flow rate. Column temperature held isothermal at 110 [deg]C for
1.5 min (during desorption), then heated as rapidly as possible to 150
[deg]C and held for 20 min; column bakeout at 190 [deg]C for 10 min.
\9\
Column 2 conditions: Chromosorb 101 (60/80 mesh) packed in a 6 ft. x 0.1
in. ID glass or stainless steel column with helium carrier gas at 40
mL/min flow rate. Column temperature held isothermal at 80 [deg]C for
4 min, then programmed at 50 [deg]C/min to 120 [deg]C and held for 12
min.
Table 2--Single Laboratory Accuracy and Precision--Method 603
----------------------------------------------------------------------------------------------------------------
Spike Average Standard
Sample conc. recovery deviation Average
Parameter matrix ([micro]g/ ([micro]g/ ([micro]g/ percent
L) L) L) recovery
----------------------------------------------------------------------------------------------------------------
Acrolein............................................... RW 5.0 5.2 0.2 104
RW 50.0 51.4 0.7 103
POTW 5.0 4.0 0.2 80
POTW 50.0 44.4 0.8 89
IW 5.0 0.1 0.1 2
IW 100.0 9.3 1.1 9
Acrylonitrile.......................................... RW 5.0 4.2 0.2 84
RW 50.0 51.4 1.5 103
POTW 20.0 20.1 0.8 100
POTW 100.0 101.3 1.5 101
IW 10.0 9.1 0.8 91
IW 100.0 104.0 3.2 104
----------------------------------------------------------------------------------------------------------------
ARW=Reagent water.
APOTW=Prechlorination secondary effluent from a municipal sewage treatment plant.
AIW=Industrial wastewater containing an unidentified acrolein reactant.
Table 3--Calibration and QC Acceptance Criteria--Method 603 \a\
----------------------------------------------------------------------------------------------------------------
Limit for
Range for Q S Range for X Range for
Parameter ([micro]g/ ([micro]g/ ([micro]g/ P, Ps (%)
L) L) L)
----------------------------------------------------------------------------------------------------------------
Acrolein..................................................... 45.9-54.1 4.6 42.9-60.1 88-118
Acrylonitrile................................................ 41.2-58.8 9.9 33.1-69.9 71-135
----------------------------------------------------------------------------------------------------------------
\a\=Criteria were calculated assuming a QC check sample concentration of 50 [micro]g/L. \9\
Q=Concentration measured in QC check sample, in [micro]g/L (Section 7.5.3).
[[Page 97]]
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
[GRAPHIC] [TIFF OMITTED] TC02JY92.008
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[GRAPHIC] [TIFF OMITTED] TC02JY92.009
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[GRAPHIC] [TIFF OMITTED] TC02JY92.010
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[GRAPHIC] [TIFF OMITTED] TC02JY92.011
Method 604--Phenols
1. Scope and Application
1.1 This method covers the determination of phenol and certain
substituted phenols. The following parameters may be determined by this
method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
4-Chloro-3-methylphenol.......................... 34452 59-50-7
2--Chlorophenol.................................. 34586 95-57-8
2,4-Dichlorophenol............................... 34601 120-83-2
2,4-Dimethylphenol............................... 34606 105-67-9
2,4-Dinitrophenol................................ 34616 51-28-5
2-Methyl-4,6-dinitrophenol....................... 34657 534-52-1
2-Nitrophenol.................................... 34591 88-75-5
4-Nitrophenol.................................... 34646 100-02-7
Pentachlorophenol................................ 39032 87-86-5
Phenol........................................... 34694 108-95-2
2,4,6-Trichlorophenol............................ 34621 88-06-2
------------------------------------------------------------------------
1.2 This is a flame ionization detector gas chromatographic (FIDGC)
method applicable to the determination of the compounds listed above in
municipal and industrial discharges as provided under 40 CFR 136.1. When
this method is used to analyze unfamiliar samples for any or all of the
compounds above, compound identifications should be supported by at
least one additional qualitative technique. This method describes
analytical conditions for derivatization, cleanup, and electron capture
detector gas chromatography (ECDGC) that can be used to confirm
measurements made by FIDGC. Method 625 provides gas chromatograph/mass
spectrometer (GC/MS) conditions appropriate for the qualitative and
quantitative confirmation of results for all of the parameters listed
above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix. The MDL listed in Table 1 for each
parameter was achieved with a flame ionization detector (FID). The MDLs
that were achieved when the derivatization cleanup and electron capture
detector (ECD) were employed are presented in Table 2.
[[Page 101]]
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is acidified and
extracted with methylene chloride using a separatory funnel. The
methylene chloride extract is dried and exchanged to 2-propanol during
concentration to a volume of 10 mL or less. The extract is separated by
gas chromatography and the phenols are then measured with an FID. \2\
2.2 A preliminary sample wash under basic conditions can be employed
for samples having high general organic and organic base interferences.
2.3 The method also provides for a derivatization and column
chromatography cleanup procedure to aid in the elimination of
interferences. \2,3\ The derivatives are analyzed by ECDGC.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \4\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are
coextracted from the sample. The extent of matrix interferences will
vary considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
derivatization cleanup procedure in Section 12 can be used to overcome
many of these interferences, but unique samples may require additional
cleanup approaches to achieve the MDL listed in Tables 1 and 2.
3.3 The basic sample wash (Section 10.2) may cause significantly
reduced recovery of phenol and 2,4-dimethylphenol. The analyst must
recognize that results obtained under these conditions are minimum
concentrations.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
mothod has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \5,7\ for
the information of analyst.
4.2 Special care should be taken in handling pentafluorobenzyl
bromide, which is a lachrymator, and 18-crown-6-ether, which is highly
toxic.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be
[[Page 102]]
used. Before use, however, the compressible tubing should be thoroughly
rinsed with methanol, followed by repeated rinsings with distilled water
to minimize the potential for contamination of the sample. An
integrating flow meter is required to collect flow proportional
composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, 400 mm long x 19 mm ID,
with coarse frit filter disc.
5.2.3 Chromatographic column--100 mm long x 10 mm ID, with Teflon
stopcock.
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.8 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.9 Reaction flask--15 to 25-mL round bottom flask, with standard
tapered joint, fitted with a water-cooled condenser and U-shaped drying
tube containing granular calcium chloride.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2[deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighting 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, gases, detector, and strip-chart recorder. A data system is
recommended for measuring peak areas.
5.6.1 Column for underivatized phenols--1.8 m long x 2 mm ID glass,
packed with 1% SP-1240DA on Supelcoport (80/100 mesh) or equivalent.
This column was used to develop the method performance statements in
Section 14. Guidelines for the use of alternate column packings are
provided in Section 11.1.
5.6.2 Column for derivatized phenols--1.8 m long x 2 mm ID glass,
packed with 5% OV-17 on Chromosorb W-AW-DMCS (80/100 mesh) or
equivalent. This column has proven effective in the analysis of
wastewaters for derivatization products of the parameters listed in the
scope (Section 1.1), and was used to develop the method performance
statements in Section 14. Guidelines for the use of alternate column
packings are provided in Section 11.1.
5.6.3 Detectors--Flame ionization and electron capture detectors.
The FID is used when determining the parent phenols. The ECD is used
when determining the derivatized phenols. Guidelines for the use of
alternatve detectors are provided in Section 11.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.3 Sodium hydroxide solution (1 N)--Dissolve 4 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.4 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400[deg]C for 4 h in a shallow tray.
6.5 Sodium thiosulfate--(ACS) Granular.
6.6 Sulfuric acid (1+1)--Slowly, add 50 mL of
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.7 Sulfuric acid (1 N)--Slowly, add 58 mL of
H2SO4 (ACS, sp. gr. 1.84) to reagent water and
dilute to 1 L.
6.8 Potassium carbonate--(ACS) Powdered.
6.9 Pentafluorobenzyl bromide ([alpha]-Bromopentafluorotoluene)--97%
minimum purity.
Note: This chemical is a lachrymator. (See Section 4.2.)
6.10 18-crown-6-ether (1,4,7,10,13,16-Hexaoxacyclooctadecane)--98%
minimum purity.
Note: This chemical is highly toxic.
6.11 Derivatization reagent--Add 1 mL of pentafluorobenzyl bromide
and 1 g of 18-crown-6-ether to a 50-mL volumetric flask and dilute to
volume with 2-propanol. Prepare fresh weekly. This operation should be
carried out in a hood. Store at 4 [deg]C and protect from light.
6.12 Acetone, hexane, methanol, methylene chloride, 2-propanol,
toluene--Pesticide quality or equivalent.
6.13 Silica gel--100/200 mesh, Davison, grade-923 or equivalent.
Activate at 130 [deg]C overnight and store in a desiccator.
6.14 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions may be prepared from pure standard materials or
purchased as certified solutions.
6.14.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in 2-propanol
[[Page 103]]
and dilute to volume in a 10-mL volumetric flask. Larger volumes can be
used at the convenience of the analyst. When compound purity is assayed
to be 96% or greater, the weight can be used without correction to
calculate the concentration of the stock standard. Commercially prepared
stock standards can be used at any concentration if they are certified
by the manufacturer or by an independent source.
6.14.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.14.3 Stock standard solutions must be replaced after six months,
or sooner if comparison with check standards indicates a problem.
6.15 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 To calibrate the FIDGC for the anaylsis of underivatized
phenols, establish gas chromatographic operating conditions equivalent
to those given in Table 1. The gas chromatographic system can be
calibrated using the external standard technique (Section 7.2) or the
internal standard technique (Section 7.3).
7.2 External standard calibration procedure for FIDGC:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with 2-propanol. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 2 to 5 [micro]l, analyze each calibration
standard according to Section 11 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure for FIDGC--To use this
approach, the analyst must select one or more internal standards that
are similar in analytical behavior to the compounds of interest. The
analyst must further demonstrate that the measurement of the internal
standard is not affected by method or matrix interferences. Because of
these limitations, no internal standard can be suggested that is
applicable to all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with 2-propanol. One of the standards should be at
a concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 11 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 To calibrate the ECDGC for the analysis of phenol derivatives,
establish gas chromatographic operating conditions equivalent to those
given in Table 2.
7.5.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with 2-propanol. One of the external standards should be at a
concentration near, but above, the MDL (Table 2) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
[[Page 104]]
7.5.2 Each time samples are to be derivatized, simultaneously treat
a 1-mL aliquot of each calibration standard as described in Section 12.
7.5.3 After derivatization, analyze 2 to 5 [micro]L of each column
eluate collected according to the method beginning in Section 12.8 and
tabulate peak height or area responses against the calculated equivalent
mass of underivatized phenol injected. The results can be used to
prepare a calibration curve for each compound.
7.6 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.6 and 11.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 100
[micro]g/mL in 2-propanol. The QC check sample concentrate must be
obtained from the U.S. Environmental Protection Agency, Environmental
Monitoring and Support Laboratory in Cincinnati, Ohio, if available. If
not available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
100 [micro]g/L by adding 1.00 mL of QC check sample concentrate to each
of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 3. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Talbe 3 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.2.
8.2.6.2 Beginning with Section 8.2.2, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem
[[Page 105]]
with the measurement system. If this occurs, locate and correct the
source of the problem and repeat the test for all compounds of interest
beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 100 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any,
or, if none, (2) the larger of either 5 times higher than the expected
background concentration or 100 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 3. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\8\ If spiking was performed at a concentration lower than 100 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 3, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 4, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 4,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T)2.44(100 S'/T)%. \8\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
3. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6. It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak
[[Page 106]]
on the chromatogram, confirmatory techniques such as gas chromatography
with a dissimilar column, specific element detector, or mass
spectrometer must be used. Whenever possible, the laboratory should
analyze standard reference materials and participate in relevant
performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \9\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. Fill the sample bottles and, if
residual chlorine is present, add 80 mg of sodium thiosulfate per liter
of sample and mix well. EPA Methods 330.4 and 330.5 may be used for
measurement of residual chlorine. \10\ Field test kits are available for
this purpose.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of sample bottle for later
determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 For samples high in organic content, the analyst may solvent
wash the sample at basic pH as prescribed in Sections 10.2.1 and 10.2.2
to remove potential method interferences. Prolonged or exhaustive
contact with solvent during the wash may result in low recovery of some
of the phenols, notably phenol and 2,4-dimethylphenol. For relatively
clean samples, the wash should be omitted and the extraction, beginning
with Section 10.3, should be followed.
10.2.1 Adjust the pH of the sample to 12.0 or greater with sodium
hydroxide solution.
10.2.2 Add 60 mL of methylene chloride to the sample by shaking the
funnel for 1 min with periodic venting to release excess pressure.
Discard the solvent layer. The wash can be repeated up to two additional
times if significant color is being removed.
10.3 Adjust the sample to a pH of 1 to 2 with sulfuric acid.
10.4 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.5 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.6 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.7 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.8 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.9 Increase the temperature of the hot water bath to 95 to 100
[deg]C. Remove the Synder column and rinse the flask and its lower joint
into the concentrator tube with 1 to 2 mL of 2-propanol. A 5-mL syringe
is recommended for this operation. Attach a two-ball micro-Snyder column
to the concentrator tube and prewet the column by adding about 0.5 mL of
2-propanol to the top. Place the micro-K-D apparatus on the water bath
so that the concentrator tube is partially immersed in the hot water.
Adjust the vertical position of the apparatus and the water temperature
as required to complete concentration in 5 to 10 min. At the proper rate
of distillation the balls of the column will actively chatter but the
chambers will
[[Page 107]]
not flood. When the apparent volume of liquid reaches 2.5 mL, remove the
K-D apparatus and allow it to drain and cool for at least 10 min. Add an
additional 2 mL of 2-propanol through the top of the micro-Snyder column
and resume concentrating as before. When the apparent volume of liquid
reaches 0.5 mL, remove the K-D apparatus and allow it to drain and cool
for at least 10 min.
10.10 Remove the micro-Snyder column and rinse its lower joint into
the concentrator tube with a minimum amount of 2-propanol. Adjust the
extract volume to 1.0 mL. Stopper the concentrator tube and store
refrigerated at 4 [deg]C if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial. If the sample
extract requires no further cleanup, proceed with FIDGC analysis
(Section 11). If the sample requires further cleanup, proceed to Section
12.
10.11 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Flame Ionization Detector Gas Chromatography
11.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. An example of the
separations achieved by this column is shown in Figure 1. Other packed
or capillary (open-tubular) columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
11.2 Calibrate the system daily as described in Section 7.
11.3 If the internal standard calibration procedure is used, the
internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatograph.
11.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \11\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, and
the resulting peak size in area or peak height units.
11.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
may be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
11.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
11.7 If the measurement of the peak response is prevented by the
presence of interferences, an alternative gas chromatographic procedure
is required. Section 12 describes a derivatization and column
chromatographic procedure which has been tested and found to be a
practical means of analyzing phenols in complex extracts.
12. Derivatization and Electron Capture Detector Gas Chromatography
12.1 Pipet a 1.0-mL aliquot of the 2-propanol solution of standard
or sample extract into a glass reaction vial. Add 1.0 mL of derivatizing
reagent (Section 6.11). This amount of reagent is sufficient to
derivatize a solution whose total phenolic content does not exceed 0.3
mg/mL.
12.2 Add about 3 mg of potassium carbonate to the solution and shake
gently.
12.3 Cap the mixture and heat it for 4 h at 80 [deg]C in a hot water
bath.
12.4 Remove the solution from the hot water bath and allow it to
cool.
12.5 Add 10 mL of hexane to the reaction flask and shake vigorously
for 1 min. Add 3.0 mL of distilled, deionized water to the reaction
flask and shake for 2 min. Decant a portion of the organic layer into a
concentrator tube and cap with a glass stopper.
12.6 Place 4.0 g of silica gel into a chromatographic column. Tap
the column to settle the silica gel and add about 2 g of anhydrous
sodium sulfate to the top.
12.7 Preelute the column with 6 mL of hexane. Discard the eluate and
just prior to exposure of the sodium sulfate layer to the air, pipet
onto the column 2.0 mL of the hexane solution (Section 12.5) that
contains the derivatized sample or standard. Elute the column with 10.0
mL of hexane and discard the eluate. Elute the column, in order, with:
10.0 mL of 15% toluene in hexane (Fraction 1); 10.0 mL of 40% toluene in
hexane (Fraction 2); 10.0 mL of 75% toluene in hexane (Fraction 3); and
10.0 mL of 15% 2-propanol in toluene (Fraction 4). All elution mixtures
are prepared on a volume: volume basis. Elution patterns for the
phenolic derivatives are shown in Table 2. Fractions may be combined as
desired, depending upon the specific phenols of interest or level of
interferences.
12.8 Analyze the fractions by ECDGC. Table 2 summarizes the
recommended operating conditions for the gas chromatograph. Included in
this table are retention times and MDL that can be achieved under these
conditions. An example of the separations achieved by this column is
shown in Figure 2.
[[Page 108]]
12.9 Calibrate the system daily with a minimum of three aliquots of
calibration standards, containing each of the phenols of interest that
are derivatized according to Section 7.5.
12.10 Inject 2 to 5 [micro]L of the column fractions into the gas
chromatograph using the solvent-flush technique. Smaller (1.0 [micro]L)
volumes can be injected if automatic devices are employed. Record the
volume injected to the nearest 0.05 [micro]L, and the resulting peak
size in area or peak height units. If the peak response exceeds the
linear range of the system, dilute the extract and reanalyze.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample analyzed by FIDGC (without derivatization) as indicated below.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.098
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.099
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Determine the concentration of individual compounds in the
sample analyzed by derivatization and ECDGC according to Equation 4.
[GRAPHIC] [TIFF OMITTED] TC15NO91.100
Equation 4
where:
A=Mass of underivatized phenol represented by area of peak in sample
chromatogram, determined from calibration curve in Section 7.5.3 (ng).
Vi=Volume of eluate injected ([micro]L).
Vt=Total volume of column eluate or combined fractions from
which Vi was taken ([micro]L).
Vs=Volume of water extracted in Section 10.10 (mL).
B=Total volume of hexane added in Section 12.5 (mL).
C=Volume of hexane sample solution added to cleanup column in Section
12.7 (mL).
D=Total volume of 2-propanol extract prior to derivatization (mL).
E=Volume of 2-propanol extract carried through derivatization in Section
12.1 (mL).
13.3 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Tables 1 and 2 were obtained using reagent water. \12\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
as six concentrations over the range 12 to 450 [micro]g/L. \13\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships for a flame ionization detector are
presented in Table 4.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Phenols in Industrial and Municipal
Wastewaters,'' EPA 600/4-84-ABC, National Technical Information Service,
PBXYZ, Springfield, Virginia 22161, November 1984.
3. Kawahara, F. K. ``Microdetermination of Derivatives of Phenols
and Mercaptans by Means of Electron Capture Gas Chromatography,''
Analytical Chemistry, 40, 1009 (1968).
4. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American
[[Page 109]]
Society for Testing and Materials, Philadelphia.
5. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
6. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
7. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
8. Provost, L. P., and Elder, R. S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
9. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
10. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methmds for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
11. Burke, J. A. ``Gas Chromatography for Pesticide Residue
Analysis; Some Practical Aspects,'' Journal of the Association of
Official Analytical Chemists, 48, 1037 (1965).
12. ``Development of Detection Limits, EPA Method 604, Phenols,''
Special letter report for EPA Contract 68-03-2625, U.S. Environmental
Protection Agency, Environmental Monitoring and Support Laboratory,
Cincinnati, Ohio 45268.
13. ``EPA Method Study 14 Method 604-Phenols,'' EPA 600/4-84-044,
National Technical Information Service, PB84-196211, Springfield,
Virginia 22161, May 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Method
Retention detection
Parameter time (min) limit
([micro]g/L)
------------------------------------------------------------------------
2-Chlorophenol................................ 1.70 0.31
2-Nitrophenol................................. 2.00 0.45
Phenol........................................ 3.01 0.14
2,4-Dimethylphenol............................ 4.03 0.32
2,4-Dichlorophenol............................ 4.30 0.39
2,4,6-Trichlorophenol......................... 6.05 0.64
4-Chloro-3-methylphenol....................... 7.50 0.36
2,4-Dinitrophenol............................. 10.00 13.0
2-Methyl-4,6-dinitrophenol.................... 10.24 16.0
Pentachlorophenol............................. 12.42 7.4
4-Nitrophenol................................. 24.25 2.8
------------------------------------------------------------------------
Column conditions: Supelcoport (80/100 mesh) coated with 1% SP-1240DA
packed in a 1.8 m long x 2 mm ID glass column with nitrogen carrier
gas at 30 mL/min flow rate. Column temperature was 80 [deg]C at
injection, programmed immediately at 8 [deg]C/min to 150 [deg]C final
temperature. MDL were determined with an FID.
Table 2--Silica Gel Fractionation and Electron Capture Gas Chromatography of PFBB Derivatives
----------------------------------------------------------------------------------------------------------------
Percent recovery by Method
fraction \a\ Retention detection
Parent compound ---------------------------- time limit
(min) ([micro]g/
1 2 3 4 L)
----------------------------------------------------------------------------------------------------------------
2-Chlorophenol............................................... ..... 90 1 ..... 3.3 0.58
2-Nitrophenol................................................ ..... ..... 9 90 9.1 0.77
Phenol....................................................... ..... 90 10 ..... 1.8 2.2
2,4-Dimethylphenol........................................... ..... 95 7 ..... 2.9 0.63
2,4-Dichlorophenol........................................... ..... 95 1 ..... 5.8 0.68
2,4,6-Trichlorophenol........................................ 50 50 ..... ..... 7.0 0.58
4-Chloro-3-methylphenol...................................... ..... 84 14 ..... 4.8 1.8
Pentachlorophenol............................................ 75 20 ..... ..... 28.8 0.59
4-Nitrophenol................................................ ..... ..... 1 90 14.0 0.70
----------------------------------------------------------------------------------------------------------------
Column conditions: Chromosorb W-AW-DMCS (80/100 mesh) coated with 5% OV-17 packed in a 1.8 m long x 2.0 mm ID
glass column with 5% methane/95% argon carrier gas at 30 mL/min flow rate. Column temperature held isothermal
at 200 [deg]C. MDL were determined with an ECD.
\a\ Eluant composition:
Fraction 1--15% toluene in hexane.
Fraction 2--40% toluene in hexane.
Fraction 3--75% toluene in hexane.
Fraction 4--15% 2-propanol in toluene.
[[Page 110]]
Table 3--QC Acceptance Criteria--Method 604
----------------------------------------------------------------------------------------------------------------
Limit for Range for X
Test conc. s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/ L) P, Ps
L) L) (percent)
----------------------------------------------------------------------------------------------------------------
4-Chloro-3-methylphenol....................................... 100 16.6 56.7-113.4 49-122
2-Chlorophenol................................................ 100 27.0 54.1-110.2 38-126
2,4-Dichlorophenol............................................ 100 25.1 59.7-103.3 44-119
2,4-Dimethylphenol............................................ 100 33.3 50.4-100.0 24-118
4,6-Dinitro-2-methylphenol.................................... 100 25.0 42.4-123.6 30-136
2,4-Dinitrophenol............................................. 100 36.0 31.7-125.1 12-145
2-Nitrophenol................................................. 100 22.5 56.6-103.8 43-117
4-Nitrophenol................................................. 100 19.0 22.7-100.0 13-110
Pentachlorophenol............................................. 100 32.4 56.7-113.5 36-134
Phenol........................................................ 100 14.1 32.4-100.0 23-108
2,4,6-Trichlorophenol......................................... 100 16.6 60.8-110.4 53-119
----------------------------------------------------------------------------------------------------------------
s--Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X--Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps--Percent recovery measured (Section 8.3.2, Section 8.4.2).
Note: These criteria are based directly upon the method performance data in Table 4. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 4.
Table 4--Method Accuracy and Precision as Functions of Concentration--Method 604
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single Analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
4-Chloro-3-methylphenol................................ 0.87C-1.97 0.11X-0.21 0.16X+1.41
2-Chlorophenol......................................... 0.83C-0.84 0.18X+0.20 0.21X+0.75
2,4-Dichlorophenol..................................... 0.81C+0.48 0.17X-0.02 0.18X+0.62
2,4-Dimethylphenol..................................... 0.62C-1.64 0.30X-0.89 0.25X+0.48
4,6-Dinitro-2-methylphenol............................. 0.84C-1.01 0.15X+1.25 0.19X+5.85
2,4-Dinitrophenol...................................... 0.80C-1.58 0.27X-1.15 0.29X+4.51
2-Nitrophenol.......................................... 0.81C-0.76 0.15X+0.44 0.14X+3.84
4-Nitrophenol.......................................... 0.46C+0.18 0.17X+2.43 0.19X+4.79
Pentachlorophenol...................................... 0.83C+2.07 0.22X-0.58 0.23X+0.57
Phenol................................................. 0.43C+0.11 0.20X-0.88 0.17X+0.77
2,4,6-Trichlorophenol.................................. 0.86C-0.40 0.10X+0.53 0.13X+2.40
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 111]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.012
[[Page 112]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.013
Method 605--Benzidines
1. Scope and Application
1.1 This method covers the determination of certain benzidines. The
following parameters can be determined by this method:
------------------------------------------------------------------------
Parameter Storet No CAS No.
------------------------------------------------------------------------
Benzidine..................................... 39120 92-87-5
3,3'-Dichlorobenzidine........................ 34631 91-94-1
------------------------------------------------------------------------
1.2 This is a high performance liquid chromatography (HPLC) method
applicable to the determination of the compounds listed above in
municipal and industrial discharges as provided under 40 CFR 136.1. When
this method is used to analyze unfamiliar samples for the compounds
above, identifications should be supported by at least one additional
qualitative technique. This method describes electrochemical conditions
at a second potential which can be used to confirm measurements made
with this method. Method 625 provides gas chromatograph/mass
spectrometer (GC/MS) conditions appropriate for the qualitative and
quantitative confirmation of results for the parameters listed above,
using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is
[[Page 113]]
listed in Table 1. The MDL for a specific wastewater may differ from
those listed, depending upon the nature of the interferences in the
sample matrix.
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the use of HPLC instrumentation and in the
interpretation of liquid chromatograms. Each analyst must demonstrate
the ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with chloroform using liquid-liquid extractions in a separatory funnel.
The chloroform extract is extracted with acid. The acid extract is then
neutralized and extracted with chloroform. The final chloroform extract
is exchanged to methanol while being concentrated using a rotary
evaporator. The extract is mixed with buffer and separated by HPLC. The
benzidine compounds are measured with an electrochemical detector. \2\
2.2 The acid back-extraction acts as a general purpose cleanup to
aid in the elimination of interferences.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in chromatograms. All of
these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials may not be eliminated
by this treatment. Solvent rinses with acetone and pesticide quality
hexane may be substituted for the muffle furnace heating. Volumetric
ware should not be heated in a muffle furnace. After drying and cooling,
glassware should be sealed and stored in a clean environment to prevent
any accumulation of dust or other contaminants. Store inverted or capped
with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedures that are inherent in the extraction step are used to
overcome many of these interferences, but unique samples may require
additional cleanup approaches to achieve the MDL listed in Table 1.
3.3 Some dye plant effluents contain large amounts of components
with retention times closed to benzidine. In these cases, it has been
found useful to reduce the electrode potential in order to eliminate
interferences and still detect benzidine. (See Section 12.7.)
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health harzard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \4,6\ for
the information of the analyst.
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: benzidine and 3,3'-dichlorobenzidine. Primary standards of
these toxic compounds should be prepared in a hood. A NIOSH/MESA
approved toxic gas respirator should be worn when the analyst handles
high concentrations of these toxic compounds.
4.3 Exposure to chloroform should be minimized by performing all
extractions and extract concentrations in a hood or other well-
ventiliated area.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene
[[Page 114]]
chloride, and dried before use to minimize contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4[deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested):
5.2.1 Separatory funnels--2000, 1000, and 250-mL, with Teflon
stopcock.
5.2.2 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.3 Rotary evaporator.
5.2.4 Flasks--Round bottom, 100-mL, with 24/40 joints.
5.2.5 Centrifuge tubes--Conical, graduated, with Teflon-lined screw
caps.
5.2.6 Pipettes--Pasteur, with bulbs.
5.3 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.4 High performance liquid chromatograph (HPLC)--An analytical
system complete with column supplies, high pressure syringes, detector,
and compatible recorder. A data system is recommended for measuring peak
areas and retention times.
5.4.1 Solvent delivery system--With pulse damper, Altex 110A or
equivalent.
5.4.2 Injection valve (optional)--Waters U6K or equivalent.
5.4.3 Electrochemical detector--Bioanalytical Systems LC-2A with
glassy carbon electrode, or equivalent. This detector has proven
effective in the analysis of wastewaters for the parameters listed in
the scope (Section 1.1), and was used to develop the method performance
statements in Section 14. Guidelines for the use of alternate detectors
are provided in Section 12.1.
5.4.4 Electrode polishing kit--Princeton Applied Research Model 9320
or equivalent.
5.4.5 Column--Lichrosorb RP-2, 5 micron particle diameter, in a 25
cm x 4.6 mm ID stainless steel column. This column was used to develop
the method performance statements in Section 14. Guidelines for the use
of alternate column packings are provided in Section 12.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (5 N)--Dissolve 20 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.3 Sodium hydroxide solution (1 M)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 1 L.
6.4 Sodium thiosulfate--(ACS) Granular.
6.5 Sodium tribasic phosphate (0.4 M)--Dissolve 160 g of trisodium
phosphate decahydrate (ACS) in reagent water and dilute to 1 L.
6.6 Sulfuric acid (1+1)--Slowly, add 50 mL of
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.7 Sulfuric acid (1 M)--Slowly, add 58 mL of
H2SO4 (ACS, sp. gr. 1.84) to reagent water and
dilute to 1 L.
6.8 Acetate buffer (0.1 M, pH 4.7)--Dissolve 5.8 mL of glacial
acetic acid (ACS) and 13.6 g of sodium acetate trihydrate (ACS) in
reagent water which has been purified by filtration through a RO-4
Millipore System or equivalent and dilute to 1 L.
6.9 Acetonitrile, chloroform (preserved with 1% ethanol), methanol--
Pesticide quality or equivalent.
6.10 Mobile phase--Place equal volumes of filtered acetonitrile
(Millipore type FH filter or equivalent) and filtered acetate buffer
(Millipore type GS filter or equivalent) in a narrow-mouth, glass
container and mix thoroughly. Prepare fresh weekly. Degas daily by
sonicating under vacuum, by heating and stirring, or by purging with
helium.
6.11 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions may be prepared from pure standard materials or
purchased as certified solutions.
6.11.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in methanol and dilute
to volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.11.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.11.3 Stock standard solutions must be replaced after six months,
or sooner if comparison with check standards indicates a problem.
6.12 Quality control check sample concentrate--See Section 8.2.1.
[[Page 115]]
7. Calibration
7.1 Establish chromatographic operating conditions equivalent to
those given in Table 1. The HPLC system can be calibrated using the
external standard technique (Section 7.2) or the internal standard
technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with mobile phase. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using syringe injections of 5 to 25 [micro]L or a constant
volume injection loop, analyze each calibration standard according to
Section 12 and tabulate peak height or area responses against the mass
injected. The results can be used to prepare a calibration curve for
each compound. Alternatively, if the ratio of response to amount
injected (calibration factor) is a constant over the working range (<10%
relative standard deviation, RSD), linearity through the origin can be
assumed and the average ratio or calibration factor can be used in place
of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with mobile phase. One of the standards should be
at a concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using syringe injections of 5 to 25 [micro]L or a constant
volume injection loop, analyze each calibration standard according to
Section 12 and tabulate peak height or area responses against
concentration for each compound and internal standard. Calculate
response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound. If serious loss of
response occurs, polish the electrode and recalibrate.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.9, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
[[Page 116]]
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing benzidine and/or 3,3'-dichlorobenzidine at a concentration of
50 [micro]g/mL each in methanol. The QC check sample concentrate must be
obtained from the U.S. Environmental Protection Agency, Environmental
Monitoring and Support Laboratory in Cincinnati, Ohio, if available. If
not available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
50 [micro]g/L by adding 1.00 mL of QC check sample concentrate to each
of four 1-L-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter. Locate and correct the
source of the problem and repeat the test for all parameters of interest
beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 50 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or 50 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\ If spiking was performed at a concentration lower than 50 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 2, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 3, substituting
[[Page 117]]
the spike concentration (T) for C; (2) calculate overall precision (S')
using the equation in Table 3, substituting X' for X; (3) calculate the
range for recovery at the spike concentration as (100 X'/T)2.44(100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Sections 8.2.1 or 8.3.2) to 1 L of reagent water.
The QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as HPLC with a dissimilar column, gas chromatography, or mass
spectrometer must be used. Whenever possible, the laboratory should
analyze standard reference materials and participate in relevant
performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \8\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4[deg]C and stored
in the dark from the time of collection until extraction. Both benzidine
and 3,3'-dichlorobenzidine are easily oxidized. Fill the sample bottles
and, if residual chlorine is present, add 80 mg of sodium thiosulfate
per liter of sample and mix well. EPA Methods 330.4 and 330.5 may be
used for measurement of residual chlorine. \9\ Field test kits are
available for this purpose. After mixing, adjust the pH of the sample to
a range of 2 to 7 with sulfuric acid.
9.3 If 1,2-diphenylhydrazine is likely to be present, adjust the pH
of the sample to 4.0 0.2 to prevent rearrangement
to benzidine.
9.4 All samples must be extracted within 7 days of collection.
Extracts may be held up to 7 days before analysis, if stored under an
inert (oxidant free) atmosphere. \2\ The extract should be protected
from light.
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel. Check the pH of the sample with wide-range pH paper
and adjust to within the range of 6.5 to 7.5 with sodium hydroxide
solution or sulfuric acid.
10.2 Add 100 mL of chloroform to the sample bottle, seal, and shake
30 s to rinse the inner surface. (Caution: Handle chloroform in a well
ventilated area.) Transfer the solvent to the separatory funnel and
extract the sample by shaking the funnel for 2 min with periodic venting
to release excess pressure. Allow the organic layer to separate from the
water phase for a minimum of 10 min. If the emulsion interface between
layers is more than one-third the volume of the solvent layer, the
analyst must employ mechanical techniques to complete the phase
separation. The optimum technique depends upon the sample, but may
include stirring,
[[Page 118]]
filtration of the emulsion through glass wool, centrifugation, or other
physical methods. Collect the chloroform extract in a 250-mL separatory
funnel.
10.3 Add a 50-mL volume of chloroform to the sample bottle and
repeat the extraction procedure a second time, combining the extracts in
the separatory funnel. Perform a third extraction in the same manner.
10.4 Separate and discard any aqueous layer remaining in the 250-mL
separatory funnel after combining the organic extracts. Add 25 mL of 1 M
sulfuric acid and extract the sample by shaking the funnel for 2 min.
Transfer the aqueous layer to a 250-mL beaker. Extract with two
additional 25-mL portions of 1 M sulfuric acid and combine the acid
extracts in the beaker.
10.5 Place a stirbar in the 250-mL beaker and stir the acid extract
while carefully adding 5 mL of 0.4 M sodium tribasic phosphate. While
monitoring with a pH meter, neutralize the extract to a pH between 6 and
7 by dropwise addition of 5 N sodium hydroxide solution while stirring
the solution vigorously. Approximately 25 to 30 mL of 5 N sodium
hydroxide solution will be required and it should be added over at least
a 2-min period. Do not allow the sample pH to exceed 8.
10.6 Transfer the neutralized extract into a 250-mL separatory
funnel. Add 30 mL of chloroform and shake the funnel for 2 min. Allow
the phases to separate, and transfer the organic layer to a second 250-
mL separatory funnel.
10.7 Extract the aqueous layer with two additional 20-mL aliquots of
chloroform as before. Combine the extracts in the 250-mL separatory
funnel.
10.8 Add 20 mL of reagent water to the combined organic layers and
shake for 30 s.
10.9 Transfer the organic extract into a 100-mL round bottom flask.
Add 20 mL of methanol and concentrate to 5 mL with a rotary evaporator
at reduced pressure and 35 [deg]C. An aspirator is recommended for use
as the source of vacuum. Chill the receiver with ice. This operation
requires approximately 10 min. Other concentration techniques may be
used if the requirements of Section 8.2 are met.
10.10 Using a 9-in. Pasteur pipette, transfer the extract to a 15-
mL, conical, screw-cap centrifuge tube. Rinse the flask, including the
entire side wall, with 2-mL portions of methanol and combine with the
original extract.
10.11 Carefully concentrate the extract to 0.5 mL using a gentle
stream of nitrogen while heating in a 30 [deg]C water bath. Dilute to 2
mL with methanol, reconcentrate to 1 mL, and dilute to 5 mL with acetate
buffer. Mix the extract thoroughly. Cap the centrifuge tube and store
refrigerated and protected from light if further processing will not be
performed immediately. If the extract will be stored longer than two
days, it should be transferred to a Teflon-sealed screw-cap vial. If the
sample extract requires no further cleanup, proceed with HPLC analysis
(Section 12). If the sample requires further cleanup, proceed to Section
11.
10.12 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1,000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst first must demonstrate that the requirements of
Section 8.2 can be met using the method as revised to incorporate the
cleanup procedure.
12. High Performance Liquid Chromatography
12.1 Table 1 summarizes the recommended operating conditions for the
HPLC. Included in this table are retention times, capacity factors, and
MDL that can be achieved under these conditions. An example of the
separations achieved by this HPLC column is shown in Figure 1. Other
HPLC columns, chromatographic conditions, or detectors may be used if
the requirements of Section 8.2 are met. When the HPLC is idle, it is
advisable to maintain a 0.1 mL/min flow through the column to prolong
column life.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the instrument.
12.4 Inject 5 to 25 [micro]L of the sample extract or standard into
the HPLC. If constant volume injection loops are not used, record the
volume injected to the nearest 0.05 [micro]L, and the resulting peak
size in area or peak height units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract with mobile phase and reanalyze.
[[Page 119]]
12.7 If the measurement of the peak response for benzidine is
prevented by the presence of interferences, reduce the electrode
potential to +0.6 V and reanalyze. If the benzidine peak is still
obscured by interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.101
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.102
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \10\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 7xMDL to 3000xMDL. \10\
14.3 This method was tested by 17 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 1.0 to 70 [micro]g/L. \11\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Benzidines in Industrial and Muncipal
Wastewaters,'' EPA 600/4-82-022, National Technical Information Service,
PB82-196320, Springfield, Virginia 22161, April 1982.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
9. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
10. ``EPA Method Study 15, Method 605 (Benzidines),'' EPA 600/4-84-
062, National Technical Information Service, PB84-211176, Springfield,
Virginia 22161, June 1984.
11. ``EPA Method Validation Study 15, Method 605 (Benzidines),''
Report for EPA Contract 68-03-2624 (In preparation).
[[Page 120]]
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Method
Column detection
Parameter Retention capacity limit
time (min) factor (k') ([micro]g/
L)
------------------------------------------------------------------------
Benzidine........................ 6.1 1.44 0.08
3,3'-Dichlorobenzidine........... 12.1 3.84 0.13
------------------------------------------------------------------------
HPLC Column conditions: Lichrosorb RP-2, 5 micron particle size, in a 25
cmx4.6 mm ID stainless steel column. Mobile Phase: 0.8 mL/min of 50%
acetonitrile/50% 0.1M pH 4.7 acetate buffer. The MDL were determined
using an electrochemical detector operated at +0.8 V.
Table 2--QC Acceptance Criteria--Method 605
----------------------------------------------------------------------------------------------------------------
Limit for Range for
Test conc. s X Range for
Parameter ([micro]g/ ([micro]g/ ([micro]g/ P, Ps
L) L) L) (percent)
----------------------------------------------------------------------------------------------------------------
Benzidine........................................................ 50 18.7 9.1-61.0 D-140
3.3'-Dichlorobenzidine........................................... 50 23.6 18.7-50.0 5-128
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 605
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, precision, sr' precision, S'
X'([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Benzidine....................................................... 0.70C+0.06 0.28X+0.19 0.40X+0.18
3,3'-Dichlorobenzidine.......................................... 0.66C+0.23 0.39X-0.05 0.38X+0.02
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 121]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.014
[[Page 122]]
Method 606--Phthalate Ester
1. Scope and Application
1.1 This method covers the determination of certain phthalate
esters. The following parameters can be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Bis(2-ethylhexyl) phthalate........................ 39100 117-81-7
Butyl benzyl phthalate............................. 34292 85-68-7
Di-n-butyl phthalate............................... 39110 84-74-2
Diethyl phthalate.................................. 34336 84-66-2
Dimethyl phthalate................................. 34341 131-11-3
Di-n-octyl phthalate............................... 34596 117-84-0
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of the compounds listed above in municipal and industrial
discharges as provided under 40 CFR 136.1. When this method is used to
analyze unfamiliar samples for any or all of the compounds above,
compound identifications should be supported by at least one additional
qualitative technique. This method describes analytical conditions for a
second gas chromatographic column that can be used to confirm
measurements made with the primary column. Method 625 provides gas
chromatograph/mass spectrometer (GC/MS) conditions appropriate for the
qualitative and quantitative confirmation of results for all of the
parameters listed above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 The sample extraction and concentration steps in this method are
essentially the same as in Methods 608, 609, 611, and 612. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select chromatographic
conditions appropriate for the simultaneous measurement of combinations
of these parameters.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and exchanged to hexane during concentration
to a volume of 10 mL or less. The extract is separated by gas
chromatography and the phthalate esters are then measured with an
electron capture detector. \2\
2.2 Analysis for phthalates is especially complicated by their
ubiquitous occurrence in the environment. The method provides Florisil
and alumina column cleanup procedures to aid in the elimination of
interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Phthalate esters are contaminants in many products commonly
found in the laboratory. It is particularly important to avoid the use
of plastics because phthalates are commonly used as plasticizers and are
easily extracted from plastic materials. Serious phthalate contamination
can result at any time, if consistent quality control is not practiced.
Great care must be experienced to prevent such contamination. Exhaustive
cleanup of reagents and glassware may be required to eliminate
background phthalate contamination. \4,5\
[[Page 123]]
3.3 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedures in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \6,8\ for
the information of the analyst.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only).
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Chromatographic column--300 mm long x 10 mm ID, with Teflon
stopcock and coarse frit filter disc at bottom (Kontes K-420540-0213 or
equivalent).
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.8 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with gas
chromatograph suitable for on-column injection and all required
accessories including syringes, analytical columns, gases, detector, and
strip-chart recorder. A data system is recommended for measuring peak
areas.
5.6.1 Column 1--1.8 m long x 4 mm ID glass, packed with 1.5% SP-
2250/1.95% SP-2401 Supelcoport (100/120 mesh) or equivalent. This column
was used to develop the method performance statemelts in Section 14.
Guidelines for the use of alternate column packings are provided in
Section 12.1.
5.6.2 Column 2--1.8 m long x 4 mm ID glass, packed with 3% OV-1 on
Supelcoport (100/120 mesh) or equivalent.
5.6.3 Detector--Electron capture detector. This detector has proven
effective in the analysis of wastewaters for the parameters listed in
the scope (Section 1.1), and was used to develop the method performance
statements in Section 14. Guidelines for the use of alternate detectors
are provided in Section 12.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Acetone, hexane, isooctane, methylene chloride, methanol--
Pesticide quality or equivalent.
6.3 Ethyl ether--nanograde, redistilled in glass if necessary.
6.3.1 Ethyl ether must be shown to be free of peroxides before it is
used as indicated by
[[Page 124]]
EM Laboratories Quant test strips. (Available from Scientific Products
Co., Cat. No. P1126-8, and other suppliers.)
6.3.2 Procedures recommended for removal of peroxides are provided
with the test strips. After cleanup, 20 mL of ethyl alcohol preservative
must be added to each liter of ether.
6.4 Sodium sulfate--(ACS) Granular, anhydrous. Several levels of
purification may be required in order to reduce background phthalate
levels to an acceptable level: 1) Heat 4 h at 400 [deg]C in a shallow
tray, 2) Heat 16 h at 450 to 500 [deg]C in a shallow tray, 3) Soxhlet
extract with methylene chloride for 48 h.
6.5 Florisil--PR grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in the dark in glass containers with ground glass
stoppers or foil-lined screw caps. To prepare for use, place 100 g of
Florisil into a 500-mL beaker and heat for approximately 16 h at 40
[deg]C. After heating transfer to a 500-mL reagent bottle. Tightly seal
and cool to room temperature. When cool add 3 mL of reagent water. Mix
thoroughly by shaking or rolling for 10 min and let it stand for at
least 2 h. Keep the bottle sealed tightly.
6.6 Alumina--Neutral activity Super I, W200 series (ICN Life
Sciences Group, No. 404583). To prepare for use, place 100 g of alumina
into a 500-mL beaker and heat for approximately 16 h at 400 [deg]C.
After heating transfer to a 500-mL reagent bottle. Tightly seal and cool
to room temperature. When cool add 3 mL of reagent water. Mix thoroughly
by shaking or rolling for 10 min and let it stand for at least 2 h. Keep
the bottle sealed tightly.
6.7 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.7.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in isooctane and dilute
to volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.7.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.7.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with check standards indicates a problem.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatograph operating conditions equivalent to
those given in Table 1. The gas chromatographic system can be calibrated
using the external standard technique (Section 7.2) or the internal
standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepared calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with isooctane. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flash. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with isooctane. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
[[Page 125]]
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality contrml (QC) check sample concentrate is required
containing each parameter of interest at the following concentrations in
acetone: butyl benzyl phthalate, 10 [micro]g/mL; bis(2-ethylhexyl)
phthalate, 50 [micro]g/mL; di-n-octyl phthalate, 50 [micro]g/mL; any
other phthlate, 25 [micro]g/mL. The QC check sample concentrate must be
obtained from the U.S. Environmental Protection Agancy, Environmental
Monitoring and Support Laboratory in Cincinnati, Ohio, if available. If
not available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Using a pipet, prepare QC check samples at the test
concentrations shown in Table 2 by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively,
[[Page 126]]
found in Table 2. If s and X for all parameters of interest meet the
acceptance criteria, the system performance is acceptable and analysis
of actual samples can begin. If any individual s exceeds the precision
limit or any individual X falls outside the range for accuracy, the
system performance is unacceptable for that parameter. Locate and
correct the source of the problem and repeat the test for all parameters
of interest beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at the test concentration in Section 8.2.2 or 1 to 5
times higher than the background concentration determined in Section
8.3.2, whichever concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or the test concentration in Section 8.2.2.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\9\ If spiking was performed at a concentration lower than the test
concentration in Section 8.2.2, the analyst must use either the QC
acceptance criteria in Table 2, or optional QC acceptance criteria
calculated for the specific spike concentration. To calculate optional
acceptance criteria for the recovery of a parameter: (1) Calculate
accuracy (X') using the equation in Table 3, substituting the spike
concentration (T) for C; (2) calculate overall precision (S') using the
equation in Table 3, substituting X' for X; (3) calculate the range for
recovery at the spike concentration as (100 X'/T)2.44(100 S'/T)%. \9\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
[[Page 127]]
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \10\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phrase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentrator
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.7 Increase the temperature of the hot water bath to about 80
[deg]C. Momentarily remove the Snyder column, add 50 mL of hexane and a
new boiling chip, and reattach the Snyder column. Concentrate the
extract as in Section 10.6, except use hexane to prewet the column. The
elapsed time of concentration should be 5 to 10 min.
10.8 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of hexane. A 5-mL
syringe is recommended for this operation. Adjust the extract volume to
10 mL. Stopper the concentrator tube and store refrigerated if further
processing will not be performed immediately. If the extract will be
stored longer than two days, it should be transferred to a Teflon-sealed
screw-cap vial. If the sample extract requires no further cleanup,
proceed with gas chromatographic analysis (Section 12). If the sample
requires further cleanup, proceed to Section 11.
10.9 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11. Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use either procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of
[[Page 128]]
Section 8.2 can be met using the method as revised to incorporate the
cleanup procedure.
11.2 If the entire extract is to be cleaned up by one of the
following procedures, it must be concentrated to 2.0 mL. To the
concentrator tube in Section 10.8, add a clean boiling chip and attach a
two-ball micro-Snyder column. Prewet the column by adding about 0.5 mL
of hexane to the top. Place the micro-K-D apparatus on a hot water bath
(80 [deg]C) so that the concentrator tube is partially immersed in the
hot water. Adjust the vertical position of the apparatus and the water
temperature as required to complete the concentration in 5 to 10 min. At
the proper rate of distillation the balls of the column will actively
chatter but the chambers will not flood. When the apparent volume of
liquid reaches about 0.5 mL, remove the K-D apparatus and allow it to
drain and cool for at least 10 min. Remove the micro-Snyder column and
rinse its lower joint into the concentrator tube with 0.2 mL of hexane.
Adjust the final volume to 2.0 mL and proceed with one of the following
cleanup procedures.
11.3 Florisil column cleanup for phthalate esters:
11.3.1 Place 10 g of Florisil into a chromatographic column. Tap the
column to settle the Florisil and add 1 cm of anhydrous sodium sulfate
to the top.
11.3.2 Preelute the column with 40 mL of hexane. The rate for all
elutions should be about 2 mL/min. Discard the eluate and just prior to
exposure of the sodium sulfate layer to the air, quantitatively transfer
the 2-mL sample extract onto the column using an additional 2 mL of
hexane to complete the transfer. Just prior to exposure of the sodium
sulfate layer to the air, add 40 mL of hexane and continue the elution
of the column. Discard this hexane eluate.
11.3.3 Next, elute the column with 100 mL of 20% ethyl ether in
hexane (V/V) into a 500-mL K-D flask equipped with a 10-mL concentrator
tube. Concentrate the collected fraction as in Section 10.6. No solvent
exchange is necessary. Adjust the volume of the cleaned up extract to 10
mL in the concentrator tube and analyze by gas chromatography (Section
12).
11.4 Alumina column cleanup for phthalate esters:
11.4.1 Place 10 g of alumina into a chromatographic column. Tap the
column to settle the alumina and add 1 cm of anhydrous sodium sulfate to
the top.
11.4.2 Preelute the column with 40 mL of hexane. The rate for all
elutions should be about 2 mL/min. Discard the eluate and just prior to
exposure of the sodium sulfate layer to the air, quantitatively transfer
the 2-mL sample extract onto the column using an additional 2 mL of
hexane to complete the transfer. Just prior to exposure of the sodium
sulfate layer to the air, add 35 mL of hexane and continue the elution
of the column. Discard this hexane eluate.
11.4.3 Next, elute the column with 140 mL of 20% ethyl ether in
hexane (V/V) into a 500-mL K-D flask equipped with a 10-mL concentrator
type. Concentrate the collected fraction as in Section 10.6. No solvent
exchange is necessary. Adjust the volume of the cleaned up extract to 10
mL in the concentrator tube and analyze by gas chromatography (Section
12).
12. Gas Chromatography
12.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Examples of the separations
achieved by Column 1 are shown in Figures 1 and 2. Other packed or
capillary (open-tubular) columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal staldard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatograph.
12.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas-chromatograph using the solvent-flush technique. \11\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, and
the resulting peak size in area or peak height units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.7 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration
[[Page 129]]
factor determined in Section 7.2.2. The concentration in the sample can
be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.103
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.104
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \12\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 5 x MDL to 1000 x MDL with the following
exceptions: dimethyl and diethyl phthalate recoveries at 1000 x MDL were
low (70%); bis-2-ethylhexyl and di-n-octyl phthalate recoveries at 5 x
MDL were low (60%). \12\
14.3 This method was tested by 16 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 0.7 to 106 [micro]g/L. \13\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Phthalates in Industrial and Muncipal
Wastewaters,'' EPA 600/4-81-063, National Technical Information Service,
PB81-232167, Springfield, Virginia 22161, July 1981.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
4. Giam, C.S., Chan, H.S., and Nef, G.S. ``Sensitive Method for
Determination of Phthalate Ester Plasticizers in Open-Ocean Biota
Samples,'' Analytical Chemistry, 47, 2225 (1975).
5. Giam, C.S., and Chan, H.S. ``Control of Blanks in the Analysis of
Phthalates in Air and Ocean Biota Samples,'' U.S. National Bureau of
Standards, Special Publication 442, pp. 701-708, 1976.
6. ``Carcinogens--Working with Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
7. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
8. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
9. Provost L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
10. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
11. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
12. ``Method Detection Limit and Analytical Curve Studies, EPA
Methods 606, 607, and 608,'' Special letter report for EPA Contract 68-
03-2606, U.S. Environmental Protection Agency, Environmental Monitoring
and Support Laboratory, Cincinnati, Ohio 45268, June 1980.
13. ``EPA Method Study 16 Method 606 (Phthalate Esters),'' EPA 600/
4-84-056, National Technical Information Service, PB84-211275,
Springfield, Virginia 22161, June 1984.
[[Page 130]]
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
---------------------------- detection
Parameter limit
Column 1 Column 2 ([micro]g/L)
------------------------------------------------------------------------
Dimethyl phthalate............ 2.03 0.95 0.29
Diethyl phthalate............. 2.82 1.27 0.49
Di-n-butyl phthalate.......... 8.65 3.50 0.36
Butyl benzyl phthalate........ \a\ 6.94 \a\ 5.11 0.34
Bis(2-ethylhexyl) phthalate... \a\ 8.92 \a\ 10.5 2.0
Di-n-octyl phthalate.......... \a\ 16.2 \a\ 18.0 3.0
------------------------------------------------------------------------
Column 1 conditions: Supelcoport (100/120 mesh) coated with 1.5% SP-2250/
1.95% SP-2401 packed in a 1.8 m long x 4 mm ID glass column with 5%
methane/95% argon carrier gas at 60 mL/min flow rate. Column
temperature held isothermal at 180[deg]C, except where otherwise
indicated.
Column 2 conditions: Supelcoport (100/120 mesh) coated with 3% OV-1
packed in a 1.8 m long x 4 mm ID glass column with 5% methane/95%
argon carrier gas at 60 mL/min flow rate. Column temperature held
isothermal at 200 [deg]C, except where otherwise indicated.
\a\ 220 [deg]C column temperature.
Table 2--QC Acceptance Criteria--Method 606
----------------------------------------------------------------------------------------------------------------
Limit for Range for
Test conc. s X Range for
Parameter ([micro]g/ ([micro]g/ ([micro]g/ P, Ps
L) L) L) (percent)
----------------------------------------------------------------------------------------------------------------
Bis(2-ethylhexyl) phthalate...................................... 50 38.4 1.2-55.9 D-158
Butyl benzyl phthalate........................................... 10 4.2 5.7-11.0 30-136
Di-n-butyl phthalate............................................. 25 8.9 10.3-29.6 23-136
Diethyl phthalate................................................ 25 9.0 1.9-33.4 D-149
Dimethyl phathalate.............................................. 25 9.5 1.3-35.5 D-156
Di-n-octyl phthalate............................................. 50 13.4 D-50.0 D-114
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 606
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Bis(2-ethylhexyl) phthalate..................................... 0.53C+2.02 0.80X-2.54 0.73X-0.17
Butyl benzyl phthalate.......................................... 0.82C+0.13 0.26X+0.04 0.25X+0.07
Di-n-butyl phthalate............................................ 0.79C+0.17 0.23X+0.20 0.29X+0.06
Diethyl phthalate............................................... 0.70C+0.13 0.27X+0.05 0.45X+0.11
Dimethyl phthalate.............................................. 0.73C+0.17 0.26X+0.14 0.44X+0.31
Di-n-octyl phthalate............................................ 0.35C-0.71 0.38X+0.71 0.62X+0.34
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 131]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.015
[[Page 132]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.016
[[Page 133]]
Method 607--Nitrosamines
1. Scope and Application
1.1 This method covers the determination of certain nitrosamines.
The following parameters can be determined by this method:
------------------------------------------------------------------------
Parameter Storet No. CAS No.
------------------------------------------------------------------------
N-Nitrosodimethylamine........................ 34438 62-75-9
N-Nitrosodiphenylamine........................ 34433 86-30-6
N-Nitrosodi-n-propylamine..................... 34428 621-64-7
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of the parameters listed above in municipal and industrial
discharges as provided under 40 CFR 136.1. When this method is used to
analyze unfamiliar samples for any or all of the compmunds above,
compound identifications should be supported by at least one additional
qualitative technique. This method describes analytical conditimns for a
second gas chromatographic column that can be used to confirm
measurements made with the primary column. Method 625 provides gas
chromatograph/mass spectrometer (GC/MS) conditions appropriate for the
qualitative and quantitative confirmation of results for N-nitrosodi-n-
propylamine. In order to confirm the presence of N-nitrosodiphenylamine,
the cleanup procedure specified in Section 11.3 or 11.4 must be used. In
order to confirm the presence of N-nitrosodimethylamine by GC/MS, Column
1 of this method must be substituted for the column recommended in
Method 625. Confirmation of these parameters using GC-high resolution
mass spectrometry or a Thermal Energy Analyzer is also recommended.
\1,2\
1.3 The method detection limit (MDL, defined in Section 14.1) \3\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.5 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is washed with dilute hydrochloric acid to remove free
amines, dried, and concentrated to a volume of 10 mL or less. After the
extract has been exchanged to methanol, it is separated by gas
chromatography and the parameters are then measured with a nitrogen-
phosphorus detector. \4\
2.2 The method provides Florisil and alumina column cleanup
procedures to separate diphenylamine from the nitrosamines and to aid in
the elimination of interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \5\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Solvent rinses with acetone and pesticide quality
hexane may be substituted for the muffle furnace heating. Volumetric
ware should not be heated in a muffle furnace. After drying and cooling,
glassware should be sealed and stored in a clean environment to prevent
any accumulation of dust or other contaminants. Store inverted or capped
with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedures in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
3.3 N-Nitrosodiphenylamine is reported 6-9 to undergo
transnitrosation reactions. Care must be exercised in the heating or
concentrating of solutions containing this compound in the presence of
reactive amines.
3.4 The sensitive and selective Thermal Energy Analyzer and the
reductive Hall detector may be used in place of the nitrogen-phosphorus
detector when interferences are encountered. The Thermal Energy Analyzer
offers the highest selectivity of the non-MS detectors.
[[Page 134]]
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
10-12 for the information of the analyst.
4.2 These nitrosamines are known carcinogens, 13-17
therefore, utmost care must be exercised in the handling of these
materials. Nitrosamine reference standards and standard solutions should
be handled and prepared in a ventilated glove box within a properly
ventilated room.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flowmeter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnels--2-L and 250-mL, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.4 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.5 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.6 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.8 Chromatographic column--Approximately 400 mm long x 22 mm ID,
with Teflon stopcock and coarse frit filter disc at bottom (Kontes K-
420540-0234 or equivalent), for use in Florisil column cleanup
procedure.
5.2.9 Chromatographic column--Approximately 300 mm long x 10 mm ID,
with Teflon stopcock and coarse frit filter disc at bottom (Kontes K-
420540-0213 or equivalent), for use in alumina column cleanup procedure.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with gas
chromatograph suitable for on-column injection and all required
accessories including syringes, analytical columns, gases, detector, and
strip-chart recorder. A data system is recommended for measuring peak
areas.
5.6.1 Column 1--1.8 m long x 4 mm ID glass, packed with 10% Carbowax
20 M/2% KOH on Chromosorb W-AW (80/100 mesh) or equivalent. This column
was used to develop the method performance statements in Section 14.
Guidelines for the use of alternate column packings are provided in
Section 12.2.
5.6.2 Column 2--1.8 m long x 4 mm ID glass, packed with 10% SP-2250
on Supel-coport (100/120 mesh) or equivalent.
5.6.3 Detector--Nitrogen-phosphorus, reductive Hall, or Thermal
Energy Analyzer detector. \1,2\ These detectors have proven effective in
the analysis of wastewaters for the parameters listed in the scope
(Section 1.1). A nitrogen-phosphorus detector was used to develop the
method performance statements in Section 14. Guidelines for the use of
alternate detectors are provided in Section 12.2.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 ml.
[[Page 135]]
6.3 Sodium thiosulfate--(ACS) Granular.
6.4 Sulfuric acid (1+1)--Slowly, add 50 mL of
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.5 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.6 Hydrochloric acid (1+9)--Add one volume of concentrated HCl
(ACS) to nine volumes of reagent water.
6.7 Acetone, methanol, methylene chloride, pentane--Pesticide
quality or equivalent.
6.8 Ethyl ether--Nanograde, redistilled in glass if necessary.
6.8.1 Ethyl ether must be shown to be free of peroxides before it is
used as indicated by EM Laboratories Quant test strips. (Available from
Scientific Products Co., Cat No. P1126-8, and other suppliers.)
6.8.2 Procedures recommended for removal of peroxides are provided
with the test strips. After cleanup, 20 mL of ethyl alcohol preservative
must be added to each liter of ether.
6.9 Florisil--PR grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in the dark in glass containers with ground glass
stoppers or foil-lined screw caps. Before use, activate each batch at
least 16 h at 130 [deg]C in a foil-covered glass container and allow to
cool.
6.10 Alumina--Basic activity Super I, W200 series (ICN Life Sciences
Group, No. 404571, or equivalent). To prepare for use, place 100 g of
alumina into a 500-mL reagent bottle and add 2 mL of reagent water. Mix
the alumina preparation thoroughly by shaking or rolling for 10 min and
let it stand for at least 2 h. The preparation should be homogeneous
before use. Keep the bottle sealed tightly to ensure proper activity.
6.11 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.11.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in methanol and dilute
to volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.11.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.11.3 Stock standard solutions must be replaced after six months,
or sooner if comparison with check standards indicates a problem.
6.12 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating conditions equivalent to
those given in Table 1. The gas chromatographic system can be calibrated
using the external standard technique (Section 7.2) or the internal
standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with methanol. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with methanol. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
[[Page 136]]
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
RF = (As)(Cis (Ais)(Cs)
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.2) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 20 [micro]g/
mL in methanol. The QC check sample concentrate must be obtained from
the U.S. Environmental Protection Agency, Environmental Monitoring and
Support Laboratory in Cincinnati, Ohio, if available. If not available
from that source, the QC check sample concentrate must be obtained from
another external source. If not available from either source above, the
QC check sample concentrate must be prepared by the laboratory using
stock standards prepared independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
20 [micro]g/L by adding 1.00 mL of QC check sample concentrate to each
of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If
[[Page 137]]
any individual s exceeds the precision limit or any individual X falls
outside the range for accuracy, the system performance is unacceptable
for that parameter. Locate and correct the source of the problem and
repeat the test for all parameters of interest beginning with Section
8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 20 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or 20 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were caluclated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\18\ If spiking was performed at a concentration lower than 20 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 2, or
optional QC acceptance criteria caluclated for the specific spike
concentration. To calculate optional acceptance crtieria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 3, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 3,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T) 2.44(100 S'/T)%. \18\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of
[[Page 138]]
the samples. Field duplicates may be analyzed to assess the precision of
the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \19\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. Fill the sample bottles and, if
residual chlorine is present, add 80 mg of sodium thiosulfate per liter
of sample and mix well. EPA Methods 330.4 and 330.5 may be used for
measurement of residual chlorine. \20\ Field test kits are available for
this purpose. If N-nitrosodiphenylamine is to be determined, adjust the
sample pH to 7 to 10 with sodium hydroxide solution or sulfuric acid.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \4\
9.4 Nitrosamines are known to be light sensitive. \7\ Samples should
be stored in amber or foil-wrapped bottles in order to minimize
photolytic decomposition.
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel. Check the pH of the sample with wide-range pH paper
and adjust to within the range of 5 to 9 with sodium hydroxide solution
or sulfuric acid.
10.2 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2 min
with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Add 10 mL of hydrochloric acid to the combined extracts and
shake for 2 min. Allow the layers to separate. Pour the combined extract
through a solvent-rinsed drying column containing about 10 cm of
anhydrous sodium sulfate, and collect the extract in the K-D
concentrator. Rinse the Erlenmeyer flask and column with 20 to 30 mL of
methylene chloride to complete the quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65[deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.7 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of methylene chloride. A
5-mL syringe is recommended for this operation. Stopper the concentrator
tube and store refrigerated if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial. If N-
nitrosodiphenylamine is to be measured by gas chromatography, the
analyst must first use a cleanup column to eliminate diphenylamine
interference (Section 11). If N-nitrosodiphenylamine is of no interest,
the analyst may proceed directly with gas chromatographic analysis
(Section 12).
10.8 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-
mL graduated cylinder. Record the sample volume to the nearest 5 mL.
[[Page 139]]
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use either procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the method as revised
to incorporate the cleanup procedure. Diphenylamine, if present in the
original sample extract, must be separated from the nitrosamines if N-
nitrosodiphenylamine is to be determined by this method.
11.2 If the entire extract is to be cleaned up by one of the
following procedures, it must be concentrated to 2.0 mL. To the
concentrator tube in Section 10.7, add a clean boiling chip and attach a
two-ball micro-Snyder column. Prewet the column by adding about 0.5 mL
of methylene chloride to the top. Place the micr-K-D apparatus on a hot
water bath (60 to 65 [deg]C) so that the concentrator tube is partially
immersed in the hot water. Adjust the vertical position of the apparatus
and the water temperature as required to complete the concentration in 5
to 10 min. At the proper rate of distillation the balls of the column
will actively chatter but the chambers will not flood. When the apparent
volume of liquid reaches about 0.5 mL, remove the K-D apparatus and
allow it to drain and cool for at least 10 min. Remove the micro-Snyder
column and rinse its lower joint into the concentrator tube with 0.2 mL
of methylene chloride. Adjust the final volume to 2.0 mL and proceed
with one of the following cleanup procedures.
11.3 Florisil column cleanup for nitrosamines:
11.3.1 Place 22 g of activated Florisil into a 22-mm ID
chromatographic column. Tap the column to settle the Florisil and add
about 5 mm of anhydrous sodium sulfate to the top.
11.3.2 Preelute the column with 40 mL of ethyl ether/pentane
(15+85)(V/V). Discard the eluate and just prior to exposure of the
sodium sulfate layer to the air, quantitatively transfer the 2-mL sample
extract onto the column using an additional 2 mL of pentane to complete
the transfer.
11.3.3 Elute the column with 90 mL of ethyl ether/pentane (15+85)(V/
V) and discard the eluate. This fraction will contain the diphenylamine,
if it is present in the extract.
11.3.4 Next, elute the column with 100 mL of acetone/ethyl ether
(5+95)(V/V) into a 500-mL K-D flask equipped with a 10-mL concentrator
tube. This fraction will contain all of the nitrosamines listed in the
scope of the method.
11.3.5 Add 15 mL of methanol to the collected fraction and
concentrate as in Section 10.6, except use pentane to prewet the column
and set the water bath at 70 to 75 [deg]C. When the apparatus is cool,
remove the Snyder column and rinse the flask and its lower joint into
the concentrator tube with 1 to 2 mL of pentane. Analyze by gas
chromatography (Section 12).
11.4 Alumina column cleanup for nitrosamines:
11.4.1 Place 12 g of the alumina preparation (Section 6.10) into a
10-mm ID chromatographic column. Tap the column to settle the alumina
and add 1 to 2 cm of anhydrous sodium sulfate to the top.
11.4.2 Preelute the column with 10 mL of ethyl ether/pentane
(3+7)(V/V). Discard the eluate (about 2 mL) and just prior to exposure
of the sodium sulfate layer to the air, quantitatively transfer the 2 mL
sample extract onto the column using an additional 2 mL of pentane to
complete the transfer.
11.4.3 Just prior to exposure of the sodium sulfate layer to the
air, add 70 mL of ethyl ether/pentane (3+7)(V/V). Discard the first 10
mL of eluate. Collect the remainder of the eluate in a 500-mL K-D flask
equipped with a 10 mL concentrator tube. This fraction contains N-
nitrosodiphenylamine and probably a small amount of N-nitrosodi-n-
propylamine.
11.4.4 Next, elute the column with 60 mL of ethyl ether/pentane
(1+1)(V/V), collecting the eluate in a second K-D flask equipped with a
10-mL concentrator tube. Add 15 mL of methanol to the K-D flask. This
fraction will contain N-nitrosodimethylamine, most of the N-nitrosodi-n-
propylamine and any diphenylamine that is present.
11.4.5 Concentrate both fractions as in Section 10.6, except use
pentane to prewet the column. When the apparatus is cool, remove the
Snyder column and rinse the flask and its lower joint into the
concentrator tube with 1 to 2 mL of pentane. Analyze the fractions by
gas chromatography (Section 12).
12. Gas Chromatography
12.1 N-nitrosodiphenylamine completely reacts to form diphenylamine
at the normal operating temperatures of a GC injection port (200 to 250
[deg]C). Thus, N-nitrosodiphenylamine is chromatographed and detected as
diphenylamine. Accurate determination depends on removal of
diphenylamine that may be present in the original extract prior to GC
analysis (See Section 11).
12.2 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Examples of the separations
achieved by Column 1 are shown in Figures 1 and 2. Other packed or
capillary (open-tubular) columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
12.3 Calibrate the system daily as described in Section 7.
[[Page 140]]
12.4 If the extract has not been subjected to one of the cleanup
procedures in Section 11, it is necessary to exchange the solvent from
methylene chloride to methanol before the thermionic detector can be
used. To a 1 to 10-mL volume of methylene chloride extract in a
concentrator tube, add 2 mL of methanol and a clean boiling chip. Attach
a two-ball micro-Snyder column to the concentrator tube. Prewet the
column by adding about 0.5 mL of methylene chloride to the top. Place
the micro-K-D apparatus on a boiling (100 [deg]C) water bath so that the
concentrator tube is partially immersed in the hot water. Adjust the
vertical position of the apparatus and the water temperature as required
to complete the concentration in 5 to 10 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood. When the apparent volume of liquid reaches
about 0.5 mL, remove the K-D apparatus and allow it to drain and cool
for at least 10 min. Remove the micro-Snyder column and rinse its lower
joint into the concentrator tube with 0.2 mL of methanol. Adjust the
final volume to 2.0 mL.
12.5 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatograph.
12.6 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \21\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, and
the resulting peak size in area or peak height units.
12.7 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.8 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.9 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.105
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.106
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \3\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \22\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 4 x MDL to 1000 x MDL. \22\
14.3 This method was tested by 17 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 0.8 to 55 [micro]g/L. \23\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
[[Page 141]]
References
1. Fine, D.H., Lieb, D., and Rufeh, R. ``Principle of Operation of
the Thermal Energy Analyzer for the Trace Analysis of Volatile and Non-
volatile N-nitroso Compounds,'' Journal of Chromatography, 107, 351
(1975).
2. Fine, D.H., Hoffman, F., Rounbehler, D.P., and Belcher, N.M.
``Analysis of N-nitroso Compounds by Combined High Performance Liquid
Chromatography and Thermal Energy Analysis,'' Walker, E.A., Bogovski, P.
and Griciute, L., Editors, N-nitroso Compounds--Analysis and Formation,
Lyon, International Agency for Research on Cancer (IARC Scientific
Publications No. 14), pp. 43-50 (1976).
3. 40 CFR part 136, appendix B.
4. ``Determination of Nitrosamines in Industrial and Municipal
Wastewaters,'' EPA 600/4-82-016, National Technical Information Service,
PB82-199621, Springfield, Virginia 22161, April 1982.
5. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
6. Buglass, A.J., Challis, B.C., and Osborn, M.R. ``Transnitrosation
and Decomposition of Nitrosamines,'' Bogovski, P. and Walker, E.A.,
Editors, N-nitroso Compounds in the Environment, Lyon, International
Agency for Research on Cancer (IARC Scientific Publication No. 9), pp.
94-100 (1974).
7. Burgess, E.M., and Lavanish, J.M. ``Photochemical Decomposition
of N-nitrosamines,'' Tetrahedon Letters, 1221 (1964)
8. Druckrey, H., Preussmann, R., Ivankovic, S., and Schmahl, D.
``Organotrope Carcinogene Wirkungen bei 65 Verschiedenen N-
NitrosoVerbindungen an BD-Ratten,'' Z. Krebsforsch., 69, 103 (1967).
9. Fiddler, W. ``The Occurrence and Determination of N-nitroso
Compounds,'' Toxicol. Appl. Pharmacol., 31, 352 (1975).
10. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
11. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
Part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
12. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
13. Lijinsky, W. ``How Nitrosamines Cause Cancer,'' New Scientist,
73, 216 (1977).
14. Mirvish, S.S. ``N-Nitroso compounds: Their Chemical and in vivo
Formation and Possible Importance as Environmental Carcinogens,'' J.
Toxicol. Environ. Health, 3, 1267 (1977).
15. ``Reconnaissance of Environmental Levels of Nitrosamines in the
Central United States,'' EPA-330/1-77-001, National Enforcement
Investigations Center, U.S. Environmental Protection Agency (1977).
16. ``Atmospheric Nitrosamine Assessment Report,'' Office of Air
Quality Planning and Standards, U.S. Environmental Protection Agency,
Research Triangle Park, North Carolina (1976).
17. ``Scientific and Technical Assessment Report on Nitrosamines,''
EPA-660/6-7-001, Office of Research and Development, U.S. Environmental
Protection Agency (1976).
18. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value of 1.22
derived in this report.)
19. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
20. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
21. Burke, J. A. ``Gas Chromatography for Pesticide Residue
Analysis; Some Practical Aspects,'' Journal of the Association of
Official Analytical Chemists, 48, 1037 (1965).
22. ``Method Detection Limit and Analytical Curve Studies EPA
Methods 606, 607, and 608,'' Special letter report for EPA Contract 68-
03-2606, U.S. Environmental Protection Agency, Environmental Monitoring
and Support Laboratory, Cincinnati, Ohio 45268, June 1980.
23. ``EPA Method Study 17 Method 607--Nitrosamines,'' EPA 600/4-84-
051, National Technical Information Service, PB84-207646, Springfield,
Virginia 22161, June 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
-------------------------- detection
Parameter limit
Column 1 Column 2 ([micro]g/
L)
------------------------------------------------------------------------
N-Nitrosodimethylamine........... 4.1 0.88 0.15
N-Nitrosodi-n-propylamine........ 12.1 4.2 .46
[[Page 142]]
N-Nitrosodiphenylamine \a\....... \b\ 12.8 \c\ 6.4 .81
------------------------------------------------------------------------
Column 1 conditions: Chromosorb W-AW (80/100 mesh) coated with 10%
Carbowax 20 M/2% KOH packed in a 1.8 m long x 4mm ID glass column with
helium carrier gas at 40 mL/min flow rate. Column temperature held
isothermal at 110 [deg]C, except where otherwise indicated.
Column 2 conditions: Supelcoport (100/120 mesh) coated with 10% SP-2250
packed in a 1.8 m long x 4 mm ID glass column with helium carrier gas
at 40 mL/min flow rate. Column temperature held isothermal at 120
[deg]C, except where otherwise indicated.
\a\ Measured as diphenylamine.
\b\ 220 [deg]C column temperature.
\c\ 210 [deg]C column temperature.
Table 2--QC Acceptance Criteria--Method 607
----------------------------------------------------------------------------------------------------------------
Range for X
Test conc. Limit for s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/ L) P, Ps
L) L) (percent)
----------------------------------------------------------------------------------------------------------------
N-Nitrosodimethylamine...................................... 20 3.4 4.6-20.0 13-109
N-Nitrosodiphenyl........................................... 20 6.1 2.1-24.5 D-139
N-Nitrosodi-n-propylamine................................... 20 5.7 11.5-26.8 45-146
----------------------------------------------------------------------------------------------------------------
s=Standard deviation for four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 607
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
N-Nitrosodimethylamine.......................................... 0.37C+0.06 0.25X-0.04 0.25X+0.11
N-Nitrosodiphenylamine.......................................... 0.64C+0.52 0.36X-1.53 0.46X-0.47
N-Nitrosodi-n-propylamine....................................... 0.96C-0.07 0.15X+0.13 0.21X+0.15
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 143]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.017
[[Page 144]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.018
[[Page 145]]
Method 608--Organochlorine Pesticides and PCBs
1. Scope and Application
1.1 This method covers the determination of certain organochlorine
pesticides and PCBs. The following parameters can be determined by this
method:
------------------------------------------------------------------------
Parameter STORET No. CAS No.
------------------------------------------------------------------------
Aldrin...................................... 39330 309-00-2
[alpha]-BHC................................. 39337 319-84-6
[beta]-BHC.................................. 39338 319-85-7
[delta]-BHC................................. 34259 319-86-8
[gamma]-BHC................................. 39340 58-89-9
Chlordane................................... 39350 57-74-9
4,4'-DDD.................................... 39310 72-54-8
4,4'-DDE.................................... 39320 72-55-9
4,4'-DDT.................................... 39300 50-29-3
Dieldrin.................................... 39380 60-57-1
Endosulfan I................................ 34361 959-98-8
Endosulfan II............................... 34356 33212-65-9
Endosulfan sulfate.......................... 34351 1031-07-8
Eldrin...................................... 39390 72-20-8
Endrin aldehyde............................. 34366 7421-93-4
Heptachlor.................................. 39410 76-44-8
Heptachlor epoxide.......................... 39420 1024-57-3
Toxaphene................................... 39400 8001-35-2
PCB-1016.................................... 34671 12674-11-2
PCB-1221.................................... 39488 1104-28-2
PCB-1232.................................... 39492 11141-16-5
PCB-1242.................................... 39496 53469-21-9
PCB-1248.................................... 39500 12672-29-6
PCB-1254.................................... 39504 11097-69-1
PCB-1260.................................... 39508 11096-82-5
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of the compounds listed above in municipal and industrial
discharges as provided under 40 CFR 136.1. When this method is used to
analyze unfamiliar samples for any or all of the compounds above,
compound identifications should be supported by at least one additional
qualitative technique. This method describes analytical conditions for a
second gas chromatographic column that can be used to confirm
measurements made with the primary column. Method 625 provides gas
chromatograph/mass spectrometer (GC/MS) conditions appropriate for the
qualitative and quantitative confirmation of results for all of the
parameters listed above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 The sample extraction and concentration steps in this method are
essentially the same as in Methods 606, 609, 611, and 612. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select chromatographic
conditions appropriate for the simultaneous measurement of combinations
of these parameters.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and exchanged to hexane during concentration
to a volume of 10 mL or less. The extract is separated by gas
chromatography and the parameters are then measured with an electron
capture detector. \2\
2.2 The method provides a Florisil column cleanup procedure and an
elemental sulfur removal procedure to aid in the elimination of
interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
[[Page 146]]
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Interferences by phthalate esters can pose a major problem in
pesticide analysis when using the electron capture detector. These
compounds generally appear in the chromatogram as large late eluting
peaks, especially in the 15 and 50% fractions from Florisil. Common
flexible plastics contain varying amounts of phthalates. These
phthalates are easily extracted or leached from such materials during
laboratory operations. Cross contamination of clean glassware routinely
occurs when plastics are handled during extraction steps, especially
when solvent-wetted surfaces are handled. Interferences from phthalates
can best be minimized by avoiding the use of plastics in the laboratory.
Exhaustive cleanup of reagents and glassware may be required to
eliminate background phthalate contamination. \4,5\ The interferences
from phthalate esters can be avoided by using a microcoulometric or
electrolytic conductivity detector.
3.3 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedures in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
6-8 for the information of the analyst.
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: 4,4'-DDT, 4,4'-DDD, the BHCs, and the PCBs. Primary
standards of these toxic compounds should be prepared in a hood. A
NIOSH/MESA approved toxic gas respirator should be worn when the analyst
handles high concentrations of these toxic compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during composting. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2. Glassware (All specifications are suggested. Catalog numbers
are included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Chromatographic column--400 mm long x 22 mm ID, with Teflon
stopcock and coarse frit filter disc (Kontes K-42054 or equivalent).
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna/Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with gas
chromatograph suitable for on-column injection and all required
accessories including syringes, analytical columns, gases, detector, and
strip-
[[Page 147]]
chart recorder. A data system is recommended for measuring peak areas.
5.6.1 Column 1--1.8 m long x 4 mm ID glass, packed with 1.5% SP-
2250/1.95% SP-2401 on Supelcoport (100/120 mesh) or equivalent. This
column was used to develop the method performance statements in Section
14. Guidelines for the use of alternate column packings are provided in
Section 12.1.
5.6.2 Column 2--1.8 m long x 4 mm ID glass, packed with 3% OV-1 on
Supelcoport (100/120 mesh) or equivalent.
5.6.3 Detector--Electron capture detector. This detector has proven
effective in the analysis of wastewaters for the parameters listed in
the scope (Section 1.1), and was used to develop the method performance
statements in Section 14. Guidelines for the use of alternate detectors
are provided in Section 12.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.3 Sodium thiosulfate--(ACS) Granular.
6.4 Sulfuric acid (1+1)--Slowly, add 50 mL to
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.5 Acetone, hexane, isooctane, methylene chloride--Pesticide
quality or equivalent.
6.6 Ethyl ether--Nanograde, redistilled in glass if necessary.
6.6.1 Ethyl ether must be shown to be free of peroxides before it is
used as indicated by EM Laboratories Quant test strips. (Available from
Scientific Products Co., Cat. No. P1126-8, and other suppliers.)
6.6.2 Procedures recommended for removal of peroxides are provided
with the test strips. After cleanup, 20 mL of ethyl alcohol preservative
must be added to each liter of ether.
6.7 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.8 Florisil--PR grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in the dark in glass containers with ground glass
stoppers or foil-lined screw caps. Before use, activate each batch at
least 16 h at 130 [deg]C in a foil-covered glass container and allow to
cool.
6.9 Mercury--Triple distilled.
6.10 Copper powder--Activated.
6.11 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.11.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in isooctane and dilute
to volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.11.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.11.3 Stock standard solutions must be replaced after six months,
or sooner if comparison with check standards indicates a problem.
6.12 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating conditions equivalent to
those given in Table 1. The gas chromatographic system can be calibrated
using the external standard technique (Section 7.2) or the internal
standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with isooctane. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can
[[Page 148]]
be suggested that is applicable to all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with isooctane. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.107
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, the test must
be repeated using a fresh calibration standard. Alternatively, a new
calibration curve must be prepared for that compound.
7.5 The cleanup procedure in Section 11 utilizes Florisil column
chromatography. Florisil from different batches or sources may vary in
adsorptive capacity. To standardize the amount of Florisil which is
used, the use of lauric acid value \9\ is suggested. The referenced
procedure determines the adsorption from hexane solution of lauric acid
(mg) per g of Florisil. The amount of Florisil to be used for each
column is calculated by dividing 110 by this ratio and multiplying by 20
g.
7.6 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
[[Page 149]]
8.2.1 A quality control (QC) check sample concentrate is required
containing each single-component parameter of interest at the following
concentrations in acetone: 4,4'-DDD, 10 [micro]g/mL; 4,4'-DDT, 10
[micro]g/mL; endosulfan II, 10 [micro]g/mL; endosulfan sulfate, 10
[micro]g/mL; endrin, 10 [micro]g/mL; any other single-component
pesticide, 2 [micro]g/mL. If this method is only to be used to analyze
for PCBs, chlordane, or toxaphene, the QC check sample concentrate
should contain the most representative multicomponent parameter at a
concentration of 50 [micro]g/mL in acetone. The QC check sample
concentrate must be obtained from the U.S. Environmental Protection
Agency, Environmental Monitoring and Support Laboratory in Cincinnati,
Ohio, if available. If not available from that source, the QC check
sample concentrate must be obtained from another external source. If not
available from either source above, the QC check sample concentrate must
be prepared by the laboratory using stock standards prepared
independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at the test
concentrations shown in Table 3 by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/mL; and the
standard deviation of the recovery (s) in [micro]g/mL, for each
parameter using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 3. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 3 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.2.
8.2.6.2 Beginning with Section 8.2.2, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compmunds of interest beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at the test concentration in Section 8.2.2 or 1 to 5
times higher than the background concentration determined in Section
8.3.2, whichever concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or the test concentration in Section 8.2.2.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 3. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\10\ If spiking was performed at a concentration lower than the test
concentration in Section 8.2.2, the analyst must use either the QC
acceptance criteria in Table 3, or optional QC acceptance criteria
calculated for the specific spike concentration. To calculate optional
acceptance criteria for the recovery of a parameter: (1) Calculate
accuracy (X') using the equation in Table 4, substituting the spike
concentration (T) for C; (2) calculate overall precision (S') using the
equation in Table 4, substituting X'
[[Page 150]]
for X; (3) calculate the range for recovery at the spike concentration
as (100 X'/T)2.44(100 S'/T)%. \10\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory. If the entire list of parameters in Table 3 must be measured
in the sample in Section 8.3, the probability that the analysis of a QC
check standard will be required is high. In this case the QC check
standard should be routinely analyzed with the spike sample.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standards to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
3. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2 sp to P+2 sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \11\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. If the samples will not be
extracted within 72 h of collection, the sample should be adjusted to a
pH range of 5.0 to 9.0 with sodium hydroxide solution or sulfuric acid.
Record the volume of acid or base used. If aldrin is to be determined,
add sodium thiosulfate when residual chlorine is present. EPA Methods
330.4 and 330.5 may be used for measurement of residual chlorine. \12\
Field test kits are available for this purpose.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optium technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
[[Page 151]]
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.7 Increase the temperature of the hot water bath to about 80
[deg]C. Momeltarily remove the Snyder column, add 50 mL of hexane and a
new boiling chip, and reattach the Snyder column. Concentrate the
extract as in Section 10.6, except use hexane to prewet the column. The
elapsed time of concentration should be 5 to 10 min.
10.8 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of hexane. A 5-mL
syringe is recommended for this operation. Stopper the concentrator tube
and store refrigerated if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial. If the sample
extract requires no further cleanup, proceed with gas chromatographic
analysis (Section 12). If the sample requires further cleanup, proceed
to Section 11.
10.9 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use either procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the method as revised
to incorporate the cleanup procedure. The Florisil column allows for a
select fractionation of the compounds and will eliminate polar
interferences. Elemental sulfur, which interferes with the electron
capture gas chromatography of certain pesticides, can be removed by the
technique described in Section 11.3.
11.2 Florisil column cleanup:
11.2.1 Place a weight of Florisil (nominally 20 g) predetermined by
calibration (Section 7.5), into a chromatographic column. Tap the column
to settle the Florisil and add 1 to 2 cm of anhydrous sodium sulfate to
the top.
11.2.2 Add 60 mL of hexane to wet and rinse the sodium sulfate and
Florisil. Just prior to exposure of the sodium sulfate layer to the air,
stop the elution of the hexane by closing the stopcock on the
chromatographic column. Discard the eluate.
11.2.3 Adjust the sample extract volume to 10 mL with hexane and
transfer it from the K-D concentrator tube onto the column. Rinse the
tube twice with 1 to 2 mL of hexane, adding each rinse to the column.
11.2.4 Place a 500-mL K-D flask and clean concentrator tube under
the chromatographic column. Drain the column into the flask until the
sodium sulfate layer is nearly exposed. Elute the column with 200 mL of
6% ethyl ether in hexane (V/V) (Fraction 1) at a rate of about 5 mL/min.
Remove the K-D flask and set it aside for later concentration. Elute the
column again, using 200 mL of 15% ethyl ether in hexane (V/V) (Fraction
2), into a second K-D flask. Perform the third elution using 200 mL of
50% ethyl ether in hexane (V/V) (Fraction 3). The elution patterns for
the pesticides and PCBs are shown in Table 2.
11.2.5 Concentrate the fractions as in Section 10.6, except use
hexane to prewet the column and set the water bath at about 85 [deg]C.
When the apparatus is cool, remove the Snyder column and rinse the flask
and its lower joint into the concentrator tube with hexane. Adjust the
volume of each fraction to 10 mL with hexane and analyze by gas
chromatography (Section 12).
11.3 Elemental sulfur will usually elute entirely in Fraction 1 of
the Florisil column cleanup. To remove sulfur interference from this
fraction or the original extract, pipet 1.00 mL of the concentrated
extract into a clean concentrator tube or Teflon-sealed vial. Add one to
three drops of mercury and seal. \13\ Agitate the contents of the vial
for 15 to 30 s. Prolonged shaking (2 h) may be required. If so, this may
be accomplished with a reciprocal shaker. Alternatively, activated
[[Page 152]]
copper powder may be used for sulfur removal. \14\ Analyze by gas
chromatography.
12. Gas Chromatography
12.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Examples of the separations
achieved by Column 1 are shown in Figures 1 to 10. Other packed or
capillary (open-tubular) columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatograph.
12.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \15\ Smaller
(1.0 uL) volumes may be injected if automatic devices are employed.
Record the volume injected to the nearest 0.05 [micro]L, the total
extract volume, and the resulting peak size in area or peak height
units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.7 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.108
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.109
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 When it is apparent that two or more PCB (Aroclor) mixtures are
present, the Webb and McCall procedure \16\ may be used to identify and
quantify the Aroclors.
13.3 For multicomponent mixtures (chlordane, toxaphene, and PCBs)
match retention times of peaks in the standards with peaks in the
sample. Quantitate every identifiable peak unless interference with
individual peaks persist after cleanup. Add peak height or peak area of
each identified peak in the chromatogram. Calculate as total response in
the sample versus total response in the standard.
13.4 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \17\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 4xMDL to 1000xMDL with the following
exceptions: Chlordane recovery at 4xMDL was low (60%); Toxaphene
recovery was demonstrated linear over the range of 10xMDL to 1000xMDL.
\17\
14.3 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial
[[Page 153]]
wastewaters spiked at six concentrations. \18\ Concentrations used in
the study ranged from 0.5 to 30 [micro]g/L for single-component
pesticides and from 8.5 to 400 [micro]g/L for multicomponent parameters.
Single operator precision, overall precision, and method accuracy were
found to be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 4.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Pesticides and PCBs in Industrial and
Municipal Wastewaters,'' EPA 600/4-82-023, National Technical
Information Service, PB82-214222, Springfield, Virginia 22161, April
1982.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
4. Giam, C.S., Chan, H.S., and Nef, G.S., ``Sensitive Method for
Determination of Phthalate Ester Plasticizers in Open-Ocean Biota
Samples,'' Analytical Chemistry, 47, 2225 (1975).
5. Giam, C.S., Chan, H.S. ``Control of Blanks in the Analysis of
Phthalates in Air and Ocean Biota Samples,'' U.S. National Bureau of
Standards, Special Publication 442, pp. 701-708, 1976.
6. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
7. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
8. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
9. Mills, P.A. ``Variation of Florisil Activity: Simple Method for
Measuring Absorbent Capacity and Its Use in Standardizing Florisil
Columns,'' Journal of the Association of Official Analytical Chemists,
51, 29, (1968).
10. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
11. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
12. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
13. Goerlitz, D.F., and Law, L.M. Bulletin for Environmental
Contamination and Toxicology, 6, 9 (1971).
14. ``Manual of Analytical Methods for the Analysis of Pesticides in
Human and Environmental Samples,'' EPA-600/8-80-038, U.S. Environmental
Protection Agency, Health Effects Research Laboratory, Research Triangle
Park, North Carolina.
15. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
16. Webb, R.G., and McCall, A.C. ``Quantitative PCB Standards for
Election Capture Gas Chromatography,'' Journal of Chromatographic
Science, 11, 366 (1973).
17. ``Method Detection Limit and Analytical Curve Studies, EPA
Methods 606, 607, and 608,'' Special letter report for EPA Contract 68-
03-2606, U.S. Environmental Protection Agency, Environmental Monitoring
and Support Laboratory, Cincinnati, Ohio 45268, June 1980.
18. ``EPA Method Study 18 Method 608--Organochlorine Pesticides and
PCBs,'' EPA 600/4-84-061, National Technical Information Service, PB84-
211358, Springfield, Virginia 22161, June 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
-------------------------- detection
Parameter limit
Col. 1 Col. 2 ([micro]g/L)
------------------------------------------------------------------------
[alpha]-BHC.................... 1.35 1.82 0.003
[gamma]-BHC.................... 1.70 2.13 0.004
[beta]-BHC..................... 1.90 1.97 0.006
Heptachlor..................... 2.00 3.35 0.003
[delta]-BHC.................... 2.15 2.20 0.009
Aldrin......................... 2.40 4.10 0.004
Heptachlor epoxide............. 3.50 5.00 0.083
Endosulfan I................... 4.50 6.20 0.014
4,4'-DDE....................... 5.13 7.15 0.004
Dieldrin....................... 5.45 7.23 0.002
Endrin......................... 6.55 8.10 0.006
[[Page 154]]
4,4'-DDD....................... 7.83 9.08 0.011
Endosulfan II.................. 8.00 8.28 0.004
4,4'-DDT....................... 9.40 11.75 0.012
Endrin aldehyde................ 11.82 9.30 0.023
Endosulfan sulfate............. 14.22 10.70 0.066
Chlordane...................... mr mr 0.014
Toxaphene...................... mr mr 0.24
PCB-1016....................... mr mr nd
PCB-1221....................... mr mr nd
PCB-1232....................... mt mr nd
PCB-1242....................... mr mr 0.065
PCB-1248....................... mr mr nd
PCB-1254....................... mr mr nd
PCB-1260....................... mr mr nd
------------------------------------------------------------------------
AColumn 1 conditions: Supelcoport (100/120 mesh) coated with 1.5% SP-
2250/1.95% SP-2401 packed in a 1.8 m long x 4 mm ID glass column with
5% methane/95% argon carrier gas at 60 mL/min flow rate. Column
temperature held isothermal at 200 [deg]C, except for PCB-1016 through
PCB-1248, should be measured at 160 [deg]C.
AColumn 2 conditions: Supelcoport (100/120 mesh) coated with 3% OV-1
packed in a 1.8 m long x 4 mm ID glass column with 5% methane/95%
argon carrier gas at 60 mL/min flow rate. Column temperature held
isothermal at 200 [deg]C for the pesticides; at 140 [deg]C for PCB-
1221 and 1232; and at 170 [deg]C for PCB-1016 and 1242 to 1268.
Amr=Multiple peak response. See Figures 2 thru 10.
And=Not determined.
Table 2--Distribution of Chlorinated Pesticides and PCBs into Florisil
Column Fractions 2
------------------------------------------------------------------------
Percent recovery by fraction \a\
Parameter --------------------------------------
1 2 3
------------------------------------------------------------------------
Aldrin........................... 100 ........... ...........
[alpha]-BHC...................... 100 ........... ...........
[beta]-BHC....................... 97 ........... ...........
[delta]-BHC...................... 98 ........... ...........
[gamma]-BHC...................... 100 ........... ...........
Chlordane........................ 100 ........... ...........
4,4'-DDD......................... 99 ........... ...........
4,4'-DDE......................... 98 ........... ...........
4,4'-DDT......................... 100 ........... ...........
Dieldrin......................... 0 100 ...........
Endosulfan I..................... 37 64 ...........
Endosulfan II.................... 0 7 91
Endosulfan sulfate............... 0 0 106
Endrin........................... 4 96 ...........
Endrin aldehyde.................. 0 68 26
Heptachlor....................... 100 ........... ...........
Heptachlor epoxide............... 100 ........... ...........
Toxaphene........................ 96 ........... ...........
PCB-1016......................... 97 ........... ...........
PCB-1221......................... 97 ........... ...........
PCB-1232......................... 95 4 ...........
PCB-1242......................... 97 ........... ...........
PCB-1248......................... 103 ........... ...........
PCB-1254......................... 90 ........... ...........
PCB-1260......................... 95 ........... ...........
------------------------------------------------------------------------
\a\ Eluant composition:
Fraction 1-6% ethyl ether in hexane.
Fraction 2-15% ethyl ether in hexane.
Fraction 3-50% ethyl ether in hexane.
Table 3--QC Acceptance Criteria--Method 608
----------------------------------------------------------------------------------------------------------------
Range for
Test conc. Limit for s X Range for
Parameter ([micro]g/ ([micro]g/L) ([micro]g/ P, Ps(%)
L) L)
----------------------------------------------------------------------------------------------------------------
Aldrin...................................................... 2.0 0.42 1.08-2.24 42-122
[alpha]-BHC................................................. 2.0 0.48 0.98-2.44 37-134
[beta]-BHC.................................................. 2.0 0.64 0.78-2.60 17-147
[delta]-BHC................................................. 2.0 0.72 1.01-2.37 19-140
[gamma]-BHC................................................. 2.0 0.46 0.86-2.32 32-127
[[Page 155]]
Chlordane................................................... 50 10.0 27.6-54.3 45-119
4,4 '-DDD................................................... 10 2.8 4.8-12.6 31-141
4,4 '-DDE................................................... 2.0 0.55 1.08-2.60 30-145
4,4'-DDT.................................................... 10 3.6 4.6-13.7 25-160
Dieldrin.................................................... 2.0 0.76 1.15-2.49 36-146
Endosulfan I................................................ 2.0 0.49 1.14-2.82 45-153
Endosulfan II............................................... 10 6.1 2.2-17.1 D-202
Endosulfan Sulfate.......................................... 10 2.7 3.8-13.2 26-144
Endrin...................................................... 10 3.7 5.1-12.6 30-147
Heptachlor.................................................. 2.0 0.40 0.86-2.00 34-111
Heptachlor epoxide.......................................... 2.0 0.41 1.13-2.63 37-142
Toxaphene................................................... 50.0 12.7 27.8-55.6 41-126
PCB-1016.................................................... 50 10.0 30.5-51.5 50-114
PCB-1221.................................................... 50 24.4 22.1-75.2 15-178
PCB-1232.................................................... 50 17.9 14.0-98.5 10-215
PCB-1242.................................................... 50 12.2 24.8-69.6 39-150
PCB-1248.................................................... 50 15.9 29.0-70.2 38-158
PCB-1254.................................................... 50 13.8 22.2-57.9 29-131
PCB-1260.................................................... 50 10.4 18.7-54.9 8-127
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 4. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 4.
Table 4--Method Accuracy and Precision as Functions of Concentration--Method 608
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst
Parameter recovery, X' precision, sr' Overall precision,
([micro]g/L) ([micro]g/L) S' ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Aldrin.............................................. 0.81C+0.04 0.16X-0.04 0.20X-0.01
[alpha]-BHC......................................... 0.84C+0.03 0.13X+0.04 0.23X-0.00
[beta]-BHC.......................................... 0.81C+0.07 0.22X-0.02 0.33X-0.05
[delta]-BHC......................................... 0.81C+0.07 0.18X+0.09 0.25X+0.03
[gamma]-BHC......................................... 0.82C-0.05 0.12X+0.06 0.22X+0.04
Chlordane........................................... 0.82C-0.04 0.13X+0.13 0.18X+0.18
4,4'-DDD............................................ 0.84C+0.30 0.20X-0.18 0.27X-0.14
4,4'-DDE............................................ 0.85C+0.14 0.13X+0.06 0.28X-0.09
4,4'-DDT............................................ 0.93C-0.13 0.17X+0.39 0.31X-0.21
Dieldrin............................................ 0.90C+0.02 0.12X+0.19 0.16X+0.16
Endosulfan I........................................ 0.97C+0.04 0.10X+0.07 0.18X+0.08
Endosulfan II....................................... 0.93C+0.34 0.41X--0.65 0.47X-0.20
Endosulfan Sulfate.................................. 0.89C-0.37 0.13X+0.33 0.24X+0.35
Endrin.............................................. 0.89C-0.04 0.20X+0.25 0.24X+0.25
Heptachlor.......................................... 0.69C+0.04 0.06X+0.13 0.16X+0.08
Heptachlor epoxide.................................. 0.89C+0.10 0.18X-0.11 0.25X-0.08
Toxaphene........................................... 0.80C+1.74 0.09X+3.20 0.20X+0.22
PCB-1016............................................ 0.81C+0.50 0.13X+0.15 0.15X+0.45
PCB-1221............................................ 0.96C+0.65 0.29X-0.76 0.35X-0.62
PCB-1232............................................ 0.91C+10.79 0.21X-1.93 0.31X+3.50
PCB-1242............................................ 0.93C+0.70 0.11X+1.40 0.21X+1.52
PCB-1248............................................ 0.97C+1.06 0.17X+0.41 0.25X-0.37
PCB-1254............................................ 0.76C+2.07 0.15X+1.66 0.17X+3.62
PCB-1260............................................ 0.66C+3.76 0.22X-2.37 0.39X-4.86
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 156]]
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Method 609--Nitroaromatics and Isophorone
1. Scope and Application
1.1 This method covers the determination of certain nitroaromatics
and isophorone. The following parameters may be determined by this
method:
------------------------------------------------------------------------
Parameter STORET No. CAS No.
------------------------------------------------------------------------
2,4-Dinitrotoluene............................ 34611 121-14-2
2,6-Dinitrotoluene............................ 34626 606-20-2
Isophorone.................................... 34408 78-59-1
Nitrobenzene.................................. 34447 98-95-3
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of
[[Page 166]]
the compounds listed above in municipal and industrial discharges as
provided under 40 CFR 136.1. When this method is used to analyze
unfamiliar samples for any or all of the compounds above, compound
identifications should be supported by at least one additional
qualitative technique. This method describes analytical conditions for a
second gas chromatographic column that can be used to confirm
measurements made with the primary column. Method 625 provides gas
chromatograph/mass spectrometer (GC/MS) conditions appropriate for the
qualitative and quantitative confirmation of results for all of the
parameters listed above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 The sample extraction and concentration steps in this method are
essentially the same as in Methods 606, 608, 611, and 612. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select chromatographic
conditions appropriate for the simultaneous measurement of combinations
of these parameters.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and exchanged to hexane during concentration
to a volume of 10 mL or less. Isophorone and nitrobenzene are measured
by flame ionization detector gas chromatography (FIDGC). The
dinitrotoluenes are measured by electron capture detector gas
chromatography (ECDGC). \2\
2.2 The method provides a Florisil column cleanup procedure to aid
in the elimination of interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baseliles in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedure in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
4-6 for the information of the analyst.
[[Page 167]]
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Chromatographic column--100 mm long x 10 mm ID, with Teflon
stopcock.
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.8 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with gas
chromatograph suitable for on-column injection and all required
accessories including syringes, analytical columns, gases, detector, and
strip-chart recorder. A data system is recommended for measuring peak
areas.
5.6.1 Column 1--1.2 m long x 2 or 4 mm ID glass, packed with 1.95%
QF-1/1.5% OV-17 on Gas-Chrom Q (80/100 mesh) or equivalent. This column
was used to develop the method performance statements given in Section
14. Guidelines for the use of alternate column packings are provided in
Section 12.1.
5.6.2 Column 2--3.0 m long x 2 or 4 mm ID glass, packed with 3% OV-
101 on Gas-Chrom Q (80/100 mesh) or equivalent.
5.6.3 Detectors--Flame ionization and electron capture detectors.
The flame ionization detector (FID) is used when determining isophorone
and nitrobenzene. The electron capture detector (ECD) is used when
determining the dinitrotoluenes. Both detectors have proven effective in
the analysis of wastewaters and were used in develop the method
performance statements in Section 14. Guidelines for the use to
alternate detectors are provided in Section 12.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.3 Sulfuric acid (1+1)--Slowly, add 50 mL of
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.4 Acetone, hexane, methanol, methylene chloride--Pesticide quality
or equivalent.
6.5 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.6 Florisil--PR grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in dark in glass containers with ground glass stoppers
or foil-lined screw caps. Before use, activate each batch at least 16 h
at 200 [deg]C in a foil-covered glass container and allow to cool.
6.7 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.7.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in hexane and dilute to
volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.7.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles.
[[Page 168]]
Store at 4 [deg]C and protect from light. Stock standard solutions
should be checked frequently for signs of degradation or evaporation,
especially just prior to preparing calibration standards from them.
6.7.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with check standards indicates a problem.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating conditions equivalent to
those given in Table 1. The gas chromatographic system can be calibrated
using the external standard technique (Section 7.2) or the internal
standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with hexane. One of the external standards should be at a concentration
near, but above, the MDL (Table 1) and the other concentrations should
correspond to the expected range of concentrations found in real samples
or should define the working range of the detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD) linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flash. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with hexane. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.110
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the
RF can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to
[[Page 169]]
generate acceptable accuracy and precision with this method. This
ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1,5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest in acetone at a concentration of
20 [micro]g/mL for each dinitrotoluene and 100 [micro]g/mL for
isophorone and nitrobenzene. The QC check sample concentrate must be
obtained from the U.S. Environmental Protection Agency, Environmental
Monitoring and Support Laboratory in Cincinnati, Ohio, if available. If
not available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Using a pipet, prepare QC check samples at the test
concentrations shown in Table 2 by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter. Locate and correct the
source of the problem and repeat the test for all parameters of interest
beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at the test concentration in Section 8.2.2 or 1 to 5
times higher than the background concentration determined in Section
8.3.2, whichever concentration would be larger.
8.3.1.3 If it is impractical to determile background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or the test concentration in Section 8.2.2.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100 (A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement
[[Page 170]]
of both the background and spike concentrations, assuming a spike to
background ratio of 5:1. This error will be accounted for to the extent
that the analyst's spike to background ratio approaches 5:1. \7\ If
spiking was performed at a concentration lower than the test
concentration in Section 8.2.2, the analyst must use either the QC
acceptance criteria in Table 2, or optional QC acceptance criteria
calculated for the specific spike concentration. To calculate optional
acceptance criteria for the recovery of a parameter: (1) Calculate
accuracy (X') using the equation in Table 3, substituting the spike
concentration (T) for C; (2) calculate overall precision (S') using the
equation in Table 3, substituting X' for X8; (3) calculate the range for
recovery at the spike concentration as (100 X'/T) 2.44 (100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4. If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of QC program for the laboratory, method accuracy for
wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp = 10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \8\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel. Check the pH of the sample with wide-range pH paper
and adjust to within the range of 5 to 9 with sodium hydroxide solution
or sulfuric acid.
10.2 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration
[[Page 171]]
of the emulsion through glass wool, centrifugation, or other physical
methods. Collect the methylene chloride extract in a 250-mL Erlenmeyer
flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Sections 10.7 and 10.8 describe a procedure for exchanging the
methylene chloride solvent to hexane while concentrating the extract
volume to 1.0 mL. When it is not necessary to achieve the MDL in Table
2, the solvent exchange may be made by the addition of 50 mL of hexane
and concentration to 10 mL as described in Method 606, Sections 10.7 and
10.8.
10.7 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.8 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of methylene chloride. A
5-mL syringe is recommended for this operation. Add 1 to 2 mL of hexane
and a clean boiling chip to the concentrator tube and attach a two-ball
micro-Snyder column. Prewet the column by adding about 0.5 mL of hexane
to the top. Place the micro-K-D apparatus on a hot water bath (60 to 65
[deg]C) so that the concentrator tube is partially immersed in the hot
water. Adjust the vertical position of the apparatus and the water
temperature as required to complete the concentration in 5 to 10 min. At
the proper rate of distillation the balls of the column will actively
chatter but the chambers will not flood. When the apparent volume of
liquid reaches 0.5 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.9 Remove the micro-Snyder column and rinse its lower joint into
the concentrator tube with a minimum amount of hexane. Adjust the
extract volume to 1.0 mL. Stopper the concentrator tube and store
refrigerated if further processing will not be performed immediately. If
the extract will be stored longer than two days, it should be
transferred to a Teflon-sealed screw-cap vial. If the sample extract
requires no further cleanup, proceed with gas chromatographic analysis
(Section 12). If the sample requires further cleanup, proceed to Section
11.
10.10 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use the procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the method as revised
to incorporate the cleanup procedure.
11.2 Florisil column cleanup:
11.2.1 Prepare a slurry of 10 g of activated Florisil in methylene
chloride/hexane (1+9)(V/V) and place the Florisil into a chromatographic
column. Tap the column to settle the Florisil and add 1 cm of anhydrous
sodium sulfate to the top. Adjust the elution rate to about 2 mL/min.
11.2.2 Just prior to exposure of the sodium sulfate layer to the
air, quantitatively transfer the sample extract onto the column using an
additional 2 mL of hexane to complete the transfer. Just prior to
exposure of the sodium sulfate layer to the air, add 30 mL of methylene
chloride/hexane (1 + 9)(V/V) and continue the elution of the column.
Discard the eluate.
11.2.3 Next, elute the column with 30 mL of acetone/methylene
chloride (1 + 9)(V/V) into a 500-mL K-D flask equipped with a 10-mL
concentrator tube. Concentrate the collected fraction as in Sections
10.6, 10.7, 10.8, and 10.9 including the solvent exchange to 1 mL of
hexane. This fraction should contain the nitroaromatics and isophorone.
Analyze by gas chromatography (Section 12).
12. Gas Chromatography
12.1 Isophorone and nitrobenzene are analyzed by injection of a
portion of the extract into an FIDGC. The dinitrotoluenes are analyzed
by a separate injection into an ECDGC. Table 1 summarizes the
recommended operating conditions for the gas chromatograph.
[[Page 172]]
Included in this table are retention times and MDL that can be achieved
under these conditions. Examples of the separations achieved by Column 1
are shown in Figures 1 and 2. Other packed or capillary (open-tubular)
columns, chromatographic conditions, or detectors may be used if the
requirements of Section 8.2 are met.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal standard must be added to the same extract and mixed
thoroughly immediately before injection into the gas chromatograph.
12.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \9\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, the
total extract volume, and the resulting peak size in area or peak height
units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.7 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.111
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.112
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \10\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 7xMDL to 1000xMDL. \10\
14.3 This method was tested by 18 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 1.0 to 515 [micro]g/L. \11\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Nitroaromatic Compounds and Isophorone in
Industrial and Municipal Wastewaters,'' EPA 600/ 4-82-024, National
Technical Information Service, PB82-208398, Springfield, Virginia 22161,
May 1982.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
[[Page 173]]
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
9. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
10. ``Determination of Method Detection Limit and Analytical Curve
for EPA Method 609--Nitroaromatics and Isophorone,'' Special letter
report for EPA Contract 68-03-2624, U.S. Environmental Protection
Agency, Environmental Monitoring and Support Laboratory, Cincinnati,
Ohio 45268, June 1980.
11. ``EPA Method Study 19, Method 609 (Nitroaromatics and
Isophorone),'' EPA 600/4-84-018, National Technical Information Service,
PB84-176908, Springfield, Virginia 22161, March 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
----------------------------------------------------------------------------------------------------------------
Retention time (min) Method detection limit
---------------------------- ([micro]g/L)
Parameter ---------------------------
Col. 1 Col. 2 ECDGC FIDGC
----------------------------------------------------------------------------------------------------------------
Nitrobenzene............................................ 3.31 4.31 13.7 3.6
2,6-Dinitrotoluene...................................... 3.52 4.75 0.01 -
Isophorone.............................................. 4.49 5.72 15.7 5.7
2,4-Dinitrotoluene...................................... 5.35 6.54 0.02 -
----------------------------------------------------------------------------------------------------------------
AAColumn 1 conditions: Gas-Chrom Q (80/100 mesh) coated with 1.95% QF-1/1.5% OV-17 packed in a 1.2 m long x 2
mm or 4 mm ID glass column. A 2 mm ID column and nitrogen carrier gas at 44 mL/min flow rate were used when
determining isophorone and nitrobenzene by FIDGC. The column temperature was held isothermal at 85 [deg]C. A 4
mm ID column and 10% methane/90% argon carrier gas at 44 mL/min flow rate were used when determining the
dinitrotoluenes by ECDGC. The column temperature was held isothermal at 145 [deg]C.
AAColumn 2 conditions: Gas-Chrom Q (80/100 mesh) coated with 3% OV-101 packed in a 3.0 m long x 2 mm or 4 mm ID
glass column. A 2 mm ID column and nitrogen carrier gas at 44 mL/min flow rate were used when determining
isophorone and nitrobenzene by FIDGC. The column temperature was held isothermal at 100 [deg]C. A 4 mm ID
column and 10% methane/90% argon carrier gas at 44 mL/min flow rate were used when determining the
dinitrotoluenes by ECDGC. The column temperature was held isothermal at 150 [deg]C.
Table 2--QC Acceptance Criteria--Method 609
----------------------------------------------------------------------------------------------------------------
Test Conc. Range for X
Parameter ([micro]g/ Limit for s ([micro]g/L) Range for
L) ([micro]g/L) P, Ps (%)
----------------------------------------------------------------------------------------------------------------
2,4-Dinitrotoluene........................................ 20 5.1 3.6-22.8 6-125
2,6-Dinitrotoluene........................................ 20 4.8 3.8-23.0 8-126
Isophorone................................................ 100 32.3 8.0-100.0 D-117
Nitrobenzene.............................................. 100 33.3 25.7-100.0 6-118
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 609
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
2,4-Dinitro-
toluene............................................... 0.65C+0.22 0.20X+0.08 0.37X-0.07
2,6-Dinitro-
toluene............................................... 0.66C+0.20 0.19X+0.06 0.36X-0.00
Isophorone............................................. 0.49C+2.93 0.28X+2.77 0.46X+0.31
Nitrobenzene........................................... 0.60C+2.00 0.25X+2.53 0.37X-0.78
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 174]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.029
[[Page 175]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.030
[[Page 176]]
Method 610--Polynuclear Aromatic Hydrocarbons
1. Scope and Application
1.1 This method covers the determination of certain polynuclear
aromatic hydrocarbons (PAH). The following parameters can be determined
by this method:
------------------------------------------------------------------------
Parameter STORET No. CAS No.
------------------------------------------------------------------------
Acenaphthene................................ 34205 83-32-9
Acenaphthylene.............................. 34200 208-96-8
Anthracene.................................. 34220 120-12-7
Benzo(a)anthracene.......................... 34526 56-55-3
Benzo(a)pyrene.............................. 34247 50-32-8
Benzo(b)fluoranthene........................ 34230 205-99-2
Benzo(ghi)perylene.......................... 34521 191-24-2
Benzo(k)fluoranthene........................ 34242 207-08-9
Chrysene.................................... 34320 218-01-9
Dibenzo(a,h)anthracene...................... 34556 53-70-3
Fluoranthene................................ 34376 206-44-0
Fluorene.................................... 34381 86-73-7
Indeno(1,2,3-cd)pyrene...................... 34403 193-39-5
Naphthalene................................. 34696 91-20-3
Phenanthrene................................ 34461 85-01-8
Pyrene...................................... 34469 129-00-0
------------------------------------------------------------------------
1.2 This is a chromatographic method applicable to the determination
of the compounds listed above in municipal and industrial discharges as
provided under 40 CFR 136.1. When this method is used to analyze
unfamiliar samples for any or all of the compounds above, compound
identifications should be supported by at least one additional
qualitative technique. Method 625 provides gas chromatograph/mass
spectrometer (GC/MS) conditions appropriate for the qualitative and
quantitative confirmation of results for many of the parameters listed
above, using the extract produced by this method.
1.3 This method provides for both high performance liquid
chromatographic (HPLC) and gas chromatographic (GC) approaches for the
determination of PAHs. The gas chromatographic procedure does not
adequately resolve the following four pairs of compounds: Anthracene and
phenanthrene; chrysene and benzo(a)anthracene; benzo(b)fluoranthene and
benzo(k)fluoranthene; and dibenzo(a,h) anthracene and indeno (1,2,3-
cd)pyrene. Unless the purpose for the analysis can be served by
reporting the sum of an unresolved pair, the liquid chromatographic
approach must be used for these compounds. The liquid chromatographic
method does resolve all 16 of the PAHs listed.
1.4 The method detection limit (MDL, defined in Section 15.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.5 The sample extraction and concentration steps in this method are
essentially the same as in Methods 606, 608, 609, 611, and 612. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. Selection of the
aliquots must be made prior to the solvent exchange steps of this
method. The analyst is allowed the latitude, under Sections 12 and 13,
to select chromatographic conditions appropriate for the simultaneous
measurement of combinations of these parameters.
1.6 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.7 This method is restricted to use by or under the supervision of
analysts experienced in the use of HPLC and GC systems and in the
interpretation of liquid and gas chromatograms. Each analyst must
demonstrate the ability to generate acceptable results with this method
using the procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and concentrated to a volume of 10 mL or less.
The extract is then separated by HPLC or GC. Ultraviolet (UV) and
fluorescence detectors are used with HPLC to identify and measure the
PAHs. A flame ionization detector is used with GC. \2\
2.2 The method provides a silica gel column cleanup procedure to aid
in the elimination of interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardward that lead to
discrete artifacts and/or elevated baselines in the chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be
[[Page 177]]
substituted for the muffle furnace heating. Thorough rinsing with such
solvents usually eliminates PCB interference. Volumetric ware should not
be heated in a muffle furnace. After drying and cooling, glassware
should be sealed and stored in a clean environment to prevent any
accumulation of dust or other contaminants. Store inverted or capped
with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedure in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
3.3 The extent of interferences that may be encountered using liquid
chromatographic techniques has not been fully assessed. Although the
HPLC conditions described allow for a unique resolution of the specific
PAH compounds covered by this method, other PAH compounds may interfere.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method have not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
4-6 for the information of the analyst.
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: benzo(a)anthracene, benzo(a)pyrene, and dibenzo(a,h)-
anthracene. Primary standards of these toxic compounds should be
prepared in a hood. A NIOSH/MESA approved toxic gas respirator should be
worn when the analyst handles high concentrations of these toxic
compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.4 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.5 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.6 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.8 Chromatographic column--250 mm long x 10 mm ID, with coarse
frit filter disc at bottom and Teflon stopcock.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 High performance liquid chromatograph (HPLC)--An analytical
system complete with column supplies, high pressure syringes, detectors,
and compatible strip-chart recorder. A data system is recommended for
measuring peak areas and retention times.
5.6.1 Gradient pumping system--Constant flow.
[[Page 178]]
5.6.2 Reverse phase column--HC-ODS Sil-X, 5 micron particle
diameter, in a 25 cm x 2.6 mm ID stainless steel column (Perkin Elmer
No. 089-0716 or equivalent). This column was used to develop the method
performance statements in Section 15. Guidelines for the use of
alternate column packings are provided in Section 12.2.
5.6.3 Detectors--Fluorescence and/or UV detectors. The fluorescence
detector is used for excitation at 280 nm and emission greater than 389
nm cutoff (Corning 3-75 or equivalent). Fluorometers should have
dispersive optics for excitation and can utilize either filter or
dispersive optics at the emission detector. The UV detector is used at
254 nm and should be coupled to the fluorescence detector. These
detectors were used to develop the method performance statements in
Section 15. Guidelines for the use of alternate detectors are provided
in Section 12.2.
5.7 Gas chromatograph--An analytical system complete with
temperature programmable gas chromatograph suitable for on-column or
splitless injection and all required accessories including syringes,
analytical columns, gases, detector, and strip-chart recorder. A data
system is recommended for measuring peak areas.
5.7.1 Column--1.8 m long x 2 mm ID glass, packed with 3% OV-17 on
Chromosorb W-AW-DCMS (100/120 mesh) or equivalent. This column was used
to develop the retention time data in Table 2. Guidelines for the use of
alternate column packings are provided in Section 13.3.
5.7.2 Detector--Flame ionization detector. This detector has proven
effective in the analysis of wastewaters for the parameters listed in
the scope (Section 1.1), excluding the four pairs of unresolved
compounds listed in Section 1.3. Guidelines for the use of alternate
detectors are provided in Section 13.3.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Cyclohexane, methanol, acetone, methylene chloride, pentane--
Pesticide quality or equivalent.
6.4 Acetonitrile--HPLC quality, distilled in glass.
6.5 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.6 Silica gel--100/200 mesh, desiccant, Davison, grade-923 or
equivalent. Before use, activate for at least 16 h at 130 [deg]C in a
shallow glass tray, loosely covered with foil.
6.7 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.7.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in acetonitrile and
dilute to volume in a 10-mL volumetric flask. Larger volumes can be used
at the convenience of the analyst. When compound purity is assayed to be
96% or greater, the weight can be used without correction to calculate
the concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.7.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.7.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with check standards indicates a problem.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish liquid or gas chromatographic operating conditions
equivalent to those given in Table 1 or 2. The chromatographic system
can be calibrated using the external standard technique (Section 7.2) or
the internal standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with acetonitrile. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 5 to 25 [micro]L for HPLC and 2 to 5
[micro]L for GC, analyze each calibration standard according to Section
12 or 13, as appropriate. Tabulate peak height or area responses against
the mass injected. The results can be used to prepare a calibration
curve for each compound. Alternatively, if the ratio of response to
amount injected (calibration factor) is a constant over the working
range (<10% relative standard deviation, RSD), linearity through the
origin can be assumed and the average ratio or calibration factor can be
used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the
[[Page 179]]
compounds of interest. The analyst must further demonstrate that the
measurement of the internal standard is not affected by method or matrix
interferences. Because of these limitations, no internal standard can be
suggested that is applicable to all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with acetonitrile. One of the standards should be
at a concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 5 to 25 [micro]L for HPLC and 2 to 5
[micro]L for GC, analyze each calibration standard according to Section
12 or 13, as appropriate. Tabulate peak height or area responses against
concentration for each compound and internal standard. Calculate
response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.113
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, the test must
be repeated using a fresh calibration standard. Alternatively, a new
calibration curve must be prepared for that compound.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, 12.2, and 13.3) to improve the separations or lower
the cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at the following concentrations in
acetonitrile: 100 [micro]g/mL of any
[[Page 180]]
of the six early-eluting PAHs (naphthalene, acenaphthylene,
acenaphthene, fluorene, phenanthrene, and anthracene); 5 [micro]g/mL of
benzo(k)fluoranthene; and 10 [micro]g/mL of any of the other PAHs. The
QC check sample concentrate must be obtained from the U.S. Environmental
Protection Agency, Environmental Monitoring and Support Laboratory in
Cincinnati, Ohio, if available. If not available from that source, the
QC check sample concentrate must be obtained from another external
source. If not available from either source above, the QC check sample
concentrate must be prepared by the laboratory using stock standards
prepared independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at the test
concentrations shown in Table 3 by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 3. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 3 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.2.
8.2.6.2 Beginning with Section 8.2.2, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at the test concentration in Section 8.2.2 or 1 to 5
times higher than the background concentration determined in Section
8.3.2, whichever concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none, (2) the larger of either 5 times higher than the expected
background concentration or the test concentration in Section 8.2.2.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100 (A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 3. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\ If spiking was performed at a concentration lower than the test
concentration in Section 8.2.2, the analyst must use either the QC
acceptance criteria in Table 3, or optional QC acceptance criteria
calculated for the specific spike concentration. To calculate optional
acceptance criteria for the recovery of a parameter: (1) Calculate
accuracy (X') using the equation in Table 4, substituting the spike
concentration (T) for C; (2) calculate overall precision (S') using the
equation in Table 4, substituting X' for X; (3) calculate the range for
recovery at the spike concentration as (100 X'/T)2.44(100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter
[[Page 181]]
that failed the critiera must be analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory. If the entire list of parameters in Table 3 must be measured
in the sample in Section 8.3, the probability that the analysis of a QC
check standard will be required is high. In this case the QC check
standard should be routinely analyzed with the spike sample.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
3. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \8\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. PAHs are known to be light
sensitive; therefore, samples, extracts, and standards should be stored
in amber or foil-wrapped bottles in order to minimize photolytic
decomposition. Fill the sample bottles and, if residual chlorine is
present, add 80 mg of sodium thiosulfate per liter of sample and mix
well. EPA Methods 330.4 and 330.5 may be used for measurement of
residual chlorine. \9\ Field test kits are available for this purpose.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
[[Page 182]]
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.7 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of methylene chloride. A
5-mL syringe is recommended for this operation. Stopper the concentrator
tube and store refrigerated if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial and protected
from light. If the sample extract requires no further cleanup, proceed
with gas or liquid chromatographic analysis (Section 12 or 13). If the
sample requires further cleanup, proceed to Section 11.
10.8 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use the procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the methods as revised
to incorporate the cleanup procedure.
11.2 Before the silica gel cleanup technique can be utilized, the
extract solvent must be exchanged to cyclohexane. Add 1 to 10 mL of the
sample extract (in methylene chloride) and a boiling chip to a clean K-D
concentrator tube. Add 4 mL of cyclohexane and attach a two-ball micro-
Snyder column. Prewet the column by adding 0.5 mL of methylene chloride
to the top. Place the micro-K-D apparatus on a boiling (100 [deg]C)
water bath so that the concentrator tube is partially immersed in the
hot water. Adjust the vertical position of the apparatus and the water
temperature as required to complete concentration in 5 to 10 min. At the
proper rate of distillation the balls of the column will actively
chatter but the chambers will not flood. When the apparent volume of the
liquid reaches 0.5 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min. Remove the micro-Snyder column and rinse
its lower joint into the concentrator tube with a minimum amount of
cyclohexane. Adjust the extract volume to about 2 mL.
11.3 Silica gel column cleanup for PAHs:
11.3.1 Prepare a slurry of 10 g of activiated silica gel in
methylene chloride and place this into a 10-mm ID chromatographic
column. Tap the column to settle the silica gel and elute the methylene
chloride. Add 1 to 2 cm of anhydrous sodium sulfate to the top of the
silica gel.
11.3.2 Preelute the column with 40 mL of pentane. The rate for all
elutions should be about 2 mL/min. Discard the eluate and just prior to
exposure of the sodium sulfate layer to the air, transfer the 2-mL
cyclohexane sample extract onto the column using an additional 2 mL
cyclohexane to complete the transfer. Just prior to exposure of the
sodium sulfate layer to the air, add 25 mL of pentane and continue the
elution of the column. Discard this pentane eluate.
11.3.3 Next, elute the column with 25 mL of methylene chloride/
pentane (4+6)(V/V) into a 500-mL K-D flask equipped with a 10-mL
concentrator tube. Concentrate the collected fraction to less than 10 mL
as in Section 10.6. When the apparatus is cool, remove the Snyder column
and rinse the flask and its lower joint with pentane. Proceed with HPLC
or GC analysis.
12. High Performance Liquid Chromatography
12.1 To the extract in the concentrator tube, add 4 mL of
acetonitrile and a new boiling chip, then attach a two-ball micro-Snyder
column. Concentrate the solvent as in Section 10.6, except set the water
bath at 95 to 100 [deg]C. When the apparatus is cool, remove the micro-
Snyder column and rinse its lower joint into the concentrator tube with
about 0.2 mL of acetonitrile. Adjust the extract volume to 1.0 mL.
12.2 Table 1 summarizes the recommended operating conditions for the
HPLC. Included in this table are retention times, capacity factors, and
MDL that can be achieved under these conditions. The UV detector is
recommended for the determination of naphthalene, acenaphthylene,
acenapthene, and
[[Page 183]]
fluorene and the fluorescence detector is recommended for the remaining
PAHs. Examples of the separations achieved by this HPLC column are shown
in Figures 1 and 2. Other HPLC columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
12.3 Calibrate the system daily as described in Section 7.
12.4 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the instrument.
12.5 Inject 5 to 25 [micro]L of the sample extract or standard into
the HPLC using a high pressure syringe or a constant volume sample
injection loop. Record the volume injected to the nearest 0.1 [micro]L,
and the resulting peak size in area or peak height units. Re-equilibrate
the HPLC column at the initial gradient conditions for at least 10 min
between injections.
12.6 Identify the parameters in the sample by comparing the
retention time of the peaks in the sample chromatogram with those of the
peaks in standard chromatograms. The width of the retention time window
used to make identifications should be based upon measurements of actual
retention time variations of standards over the course of a day. Three
times the standard deviation of a retention time for a compound can be
used to calculate a suggested window size; however, the experience of
the analyst should weigh heavily in the interpretation of chromatograms.
12.7 If the response for a peak exceeds the working range of the
system, dilute the extract with acetonitrile and reanalyze.
12.8 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Gas Chromatography
13.1 The packed column GC procedure will not resolve certain
isomeric pairs as indicated in Section 1.3 and Table 2. The liquid
chromatographic procedure (Section 12) must be used for these
parameters.
13.2 To achieve maximum sensitivity with this method, the extract
must be concentrated to 1.0 mL. Add a clean boiling chip to the
methylene chloride extract in the concentrator tube. Attach a two-ball
micro-Snyder column. Prewet the micro-Snyder column by adding about 0.5
mL of methylene chloride to the top. Place the micro-K-D apparatus on a
hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water. Adjust the vertical position of the
apparatus and the water temperature as required to complete the
concentration in 5 to 10 min. At the proper rate of distillation the
balls will actively chatter but the chambers will not flood. When the
apparent volume of liquid reaches 0.5 mL, remove the K-D apparatus and
allow it to drain and cool for at least 10 min. Remove the micro-Snyder
column and rinse its lower joint into the concentrator tube with a
minimum amount of methylene chloride. Adjust the final volume to 1.0 mL
and stopper the concentrator tube.
13.3 Table 2 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times that were
obtained under these conditions. An example of the separations achieved
by this column is shown in Figure 3. Other packed or capillary (open-
tubular) columns, chromatographic conditions, or detectors may be used
if the requirements of Section 8.2 are met.
13.4 Calibrate the gas chromatographic system daily as described in
Section 7.
13.5 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatograph.
13.6 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \10\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, and
the resulting peak size in area or peak height units.
13.7 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
13.8 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
13.9 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
14. Calculations
14.1 Determine the concentration of individual compounds in the
sample.
14.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[[Page 184]]
[GRAPHIC] [TIFF OMITTED] TC15NO91.114
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.115
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
14.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
15. Method Performance
15.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \11\ Similar
results were achieved using representative wastewaters. MDL for the GC
approach were not determined. The MDL actually achieved in a given
analysis will vary depending on instrument sensitivity and matrix
effects.
15.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 8 x MDL to 800 x MDL \11\ with the following
exception: benzo(ghi)perylene recovery at 80 x and 800 x MDL were low
(35% and 45%, respectively).
15.3 This method was tested by 16 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 0.1 to 425 [micro]g/L. \12\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 4.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Polynuclear Aromatic Hydrocarbons in
Industrial and Municipal Wastewaters,'' EPA 600/4-82-025, National
Technical Information Service, PB82-258799, Springfield, Virginia 22161,
June 1982.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
9. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
10. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
11. Cole, T., Riggin, R., and Glaser, J. ``Evaluation of Method
Detection Limits and Analytical Curve for EPA Method 610--PNAs,''
International Symposium on Polynuclear Aromatic Hydrocarbons, 5th,
Battelle's Columbus Laboratories, Columbus, Ohio (1980).
12. ``EPA Method Study 20, Method 610 (PNA's),'' EPA 600/4-84-063,
National Technical Information Service, PB84-211614, Springfield,
Virginia 22161, June 1984.
[[Page 185]]
Table 1--High Performance Liquid Chromatography Conditions and Method
Detection Limits
------------------------------------------------------------------------
Method
Retention Column detection
Parameter time capacity limit
(min) factor ([micro]g/
(k') L) \a\
------------------------------------------------------------------------
Naphthalene........................... 16.6 12.2 1.8
Acenaphthylene........................ 18.5 13.7 2.3
Acenaphthene.......................... 20.5 15.2 1.8
Fluorene.............................. 21.2 15.8 0.21
Phenanthrene.......................... 22.1 16.6 0.64
Anthracene............................ 23.4 17.6 0.66
Fluoranthene.......................... 24.5 18.5 0.21
Pyrene................................ 25.4 19.1 0.27
Benzo(a)anthracene.................... 28.5 21.6 0.013
Chrysene.............................. 29.3 22.2 0.15
Benzo(b)fluoranthene.................. 31.6 24.0 0.018
Benzo(k)fluoranthene.................. 32.9 25.1 0.017
Benzo(a)pyrene........................ 33.9 25.9 0.023
Dibenzo(a,h)anthracene................ 35.7 27.4 0.030
Benzo(ghi)perylene.................... 36.3 27.8 0.076
Indeno(1,2,3-cd)pyrene................ 37.4 28.7 0.043
------------------------------------------------------------------------
AAAHPLC column conditions: Reverse phase HC-ODS Sil-X, 5 micron
particle size, in a 25 cm x 2.6 mm ID stainless steel column.
Isocratic elution for 5 min. using acetonitrile/water (4+6), then
linear gradient elution to 100% acetonitrile over 25 min. at 0.5 mL/
min flow rate. If columns having other internal diameters are used,
the flow rate should be adjusted to maintain a linear velocity of 2 mm/
sec.
\a\ The MDL for naphthalene, acenaphthylene, acenaphthene, and fluorene
were determined using a UV detector. All others were determined using
a fluorescence detector.
Table 2--Gas Chromatographic Conditions and Retention Times
------------------------------------------------------------------------
Retention
Parameter time (min)
------------------------------------------------------------------------
Naphthalene................................................. 4.5
Acenaphthylene.............................................. 10.4
Acenaphthene................................................ 10.8
Fluorene.................................................... 12.6
Phenanthrene................................................ 15.9
Anthracene.................................................. 15.9
Fluoranthene................................................ 19.8
Pyrene...................................................... 20.6
Benzo(a)anthracene.......................................... 24.7
Chrysene.................................................... 24.7
Benzo(b)fluoranthene........................................ 28.0
Benzo(k)fluoranthene........................................ 28.0
Benzo(a)pyrene.............................................. 29.4
Dibenzo(a,h)anthracene...................................... 36.2
Indeno(1,2,3-cd)pyrene...................................... 36.2
Benzo(ghi)perylene.......................................... 38.6
------------------------------------------------------------------------
GC Column conditions: Chromosorb W-AW-DCMS (100/120 mesh) coated with 3%
OV-17 packed in a 1.8 x 2 mm ID glass column with nitrogen carrier gas
at 40 mL/min. flow rate. Column temperature was held at 100 [deg]C for
4 min., then programmed at 8 [deg]C/min. to a final hold at 280
[deg]C.
Table 3--QC Acceptance Criteria--Method 610
----------------------------------------------------------------------------------------------------------------
Range for X
Test conc. Limit for s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/ L) P, Ps (%)
L) L)
----------------------------------------------------------------------------------------------------------------
Acenaphthene................................................ 100 40.3 D-105.7 D-124
Acenaphthylene.............................................. 100 45.1 22.1-112.1 D-139
Anthracene.................................................. 100 28.7 11.2-112.3 D-126
Benzo(a)anthracene.......................................... 10 4.0 3.1-11.6 12-135
Benzo(a)pyrene.............................................. 10 4.0 0.2-11.0 D-128
Benzo(b)fluor-anthene....................................... 10 3.1 1.8-13.8 6-150
Benzo(ghi)perylene.......................................... 10 2.3 D-10.7 D-116
Benzo(k)fluo-ranthene....................................... 5 2.5 D-7.0 D-159
Chrysene.................................................... 10 4.2 D-17.5 D-199
Dibenzo(a,h)an-thracene..................................... 10 2.0 0.3-10.0 D-110
Fluoranthene................................................ 10 3.0 2.7-11.1 14-123
Fluorene.................................................... 100 43.0 D-119 D-142
Indeno(1,2,3-cd)pyrene...................................... 10 3.0 1.2-10.0 D-116
Naphthalene................................................. 100 40.7 21.5-100.0 D-122
Phenanthrene................................................ 100 37.7 8.4-133.7 D-155
Pyrene...................................................... 10 3.4 1.4-12.1 D-140
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 4. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 4.
[[Page 186]]
Table 4--Method Accuracy and Precision as Functions of Concentration--Method 610
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Acenaphthene.................................................... 0.52C + 0.54 0.39X + 0.76 0.53X + 1.32
Acenaphthylene.................................................. 0.69C - 1.89 0.36X + 0.29 0.42X + 0.52
Anthracene...................................................... 0.63C - 1.26 0.23X + 1.16 0.41X + 0.45
Benzo(a)anthracene.............................................. 0.73C + 0.05 0.28X + 0.04 0.34X + 0.02
Benzo(a)pyrene.................................................. 0.56C + 0.01 0.38X - 0.01 0.53X - 0.01
Benzo(b)fluoranthene............................................ 0.78C + 0.01 0.21X + 0.01 0.38X - 0.00
Benzo(ghi)perylene.............................................. 0.44C + 0.30 0.25X + 0.04 0.58X + 0.10
Benzo(k)fluoranthene............................................ 0.59C + 0.00 0.44X - 0.00 0.69X + 0.01
Chrysene........................................................ 0.77C - 0.18 0.32X - 0.18 0.66X - 0.22
Dibenzo(a,h)anthracene.......................................... 0.41C + 0.11 0.24X + 0.02 0.45X + 0.03
Fluoranthene.................................................... 0.68C + 0.07 0.22X + 0.06 0.32X + 0.03
Fluorene........................................................ 0.56C - 0.52 0.44X - 1.12 0.63X - 0.65
Indeno(1,2,3-cd)pyrene.......................................... 0.54C + 0.06 0.29X + 0.02 0.42X + 0.01
Naphthalene..................................................... 0.57C - 0.70 0.39X - 0.18 0.41X + 0.74
Phenanthrene.................................................... 0.72C - 0.95 0.29X + 0.05 0.47X - 0.25
Pyrene.......................................................... 0.69C - 0.12 0.25X + 0.14 0.42X - 0.00
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[GRAPHIC] [TIFF OMITTED] TC02JY92.031
[[Page 187]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.032
[[Page 188]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.033
Method 611--Haloethers
1. Scope and Application
1.1 This method covers the determination of certain haloethers. The
following parameters can be determined by this method:
------------------------------------------------------------------------
Parameter STORET No. CAS No.
------------------------------------------------------------------------
Bis(2-chloroethyl) ether...................... 34273 111-44-4
Bis(2-chloroethoxy) methane................... 34278 111-91-1
Bis(2-chloroisopropyl) ether.................. 34283 108-60-1
4-Bromophenyl phenyl ether.................... 34636 101-55-3
4-Chlorophenyl phenyl either.................. 34641 7005-72-3
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of the compounds listed above in municipal and industrial
discharges as provided under 40 CFR 136.1. When this method is used to
analyze unfamiliar samples for any or all of the compounds above,
compound identifications should be supported by at least one additional
qualitative technique. This method describes analytical conditions for a
second gas chromatographic column that can be used to confirm
measurements made with the primary column. Method 625 provides gas
chromatograph/mass spectrometer (GC/MS) conditions appropriate for the
qualitative and quantitative confirmation of results for all of the
parameters listed above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 The sample extraction and concentration steps in this method are
essentially the same as in Methods 606, 608, 609, and 612. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select
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chromatographic conditions appropriate for the simultaneous measurement
of combinations of these parameters.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and exchanged to hexane during concentration
to a volume of 10 mL or less. The extract is separated by gas
chromatography and the parameters are then measured with a halide
specific detector. \2\
2.2 The method provides a Florisil column cleanup procedure to aid
in the elimination of interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed be detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such a PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedure in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
3.3 Dichlorobenzenes are known to coelute with haloethers under some
gas chromatographic conditions. If these materials are present together
in a sample, it may be necessary to analyze the extract with two
different column packings to completely resolve all of the compounds.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
4-6 for the information of the analyst.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating
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flow meter is required to collect flow proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Chromatographic column--400 mm long x 19 mm ID, with Teflon
stopcock and coarse frit filter disc at bottom (Kontes K-420540-0224 or
equivalent).
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2[deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, gases, detector, and strip-chart recorder. A data system is
recommended for measuring peak areas.
5.6.1 Column 1--1.8 m long x 2 mm ID glass, packed with 3% SP-1000
on Supelcoport (100/120 mesh) or equivalent. This column was used to
develop the method performance statements in Section 14. Guidelines for
the use of alternate column packings are provided in Section 12.1.
5.6.2 Column 2--1.8 m long x 2 mm ID glass, packed with 2,6-
diphenylene oxide polymer (60/80 mesh), Tenax, or equivalent.
5.6.3 Detector--Halide specific detector: electrolytic conductivity
or microcoulometric. These detectors have proven effective in the
analysis of wastewaters for the parameters listed in the scope (Section
1.1). The Hall conductivity detector was used to develop the method
performance statements in Section 14. Guidelines for the use of
alternate detectors are provided in Section 12.1. Although less
selective, an electron capture detector is an acceptable alternative.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Acetone, hexane, methanol, methylene chloride, petroleum ether
(boiling range 30-60 [deg]C)--Pesticide quality or equivalent.
6.4 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.5 Florisil--PR Grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in the dark in glass containers with ground glass
stoppers or foil-lined screw caps. Before use, activate each batch at
least 16 h at 130 [deg]C in a foil-covered glass container and allow to
cool.
6.6 Ethyl ether--Nanograde, redistilled in glass if necessary.
6.6.1 Ethyl ether must be shown to be free of peroxides before it is
used as indicated by EM Laboratories Quant test strips. (Available from
Scientific Products Co., Cat. No. P1126-8, and other suppliers.)
6.6.2 Procedures recommended for removal of peroxides are provided
with the test strips. After cleanup, 20 mL of ethyl alcohol preservative
must be added to each liter of ether.
6.7 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutions can be prepared from pure standard materials or
purchased as certified solutions.
6.7.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in acetone and dilute
to volume in a 10-mL volumetric flask. Larger volumes can be used at the
convenience of the analyst. When compound purity is assayed to be 96% or
greater, the weight can be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.7.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.7.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with check standards indicates a problem.
6.8 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating conditions equivalent to
those given in Table 1. The gas chromatographic system
[[Page 191]]
can be calibrated using the external standard technique (Section 7.2) or
the internal standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with hexane. One of the external standards should be at a concentration
near, but above, the MDL (Table 1) and the other concentrations should
correspond to the expected range of concentrations found in real samples
or should define the working range of the detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with hexane. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.116
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 The cleanup procedure in Section 11 utilizes Florisil column
chromatography. Florisil from different batches or sources may vary in
adsorptive capacity. To standardize the amount of Florisil which is
used, the use of lauric acid value \7\ is suggested. The referenced
procedure determines the adsorption from hexane solution of lauric acid
(mg) per g of Florisil. The amount of Florisil to be used for each
column is calculated by dividing 110 by this ratio and multiplying by 20
g.
7.6 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
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8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 100
[micro]g/mL in acetone. The QC check sample concentrate must be obtained
from the U.S. Environmental Protection Agency, Environmental Monitoring
and Support Laboratory in Cincinnati, Ohio, if available. If not
available from that source, the QC check sample concentrate must be
obtained from another external source. If not available from either
source above, the QC check sample concentrate must be prepared by the
laboratory using stock standards prepared independently from those used
for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
100 [micro]g/L by adding 1.00 mL of QC check sample concentrate to each
of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter. Locate and correct the
source of the problem and repeat the test for all parameters of interest
beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1. The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 100 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or 100 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\8\ If spiking was performed at a concentration lower than 100 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 2, or
optional QC
[[Page 193]]
acceptance criteria calculated for the specific spike concentration. To
calculate optional acceptance criteria for the recovery of a parameter:
(1) Calculate accuracy (X') using the equation in Table 3, substituting
the spike concentration (T) for C; (2) calculate overall precision (S')
using the equation in Table 3, substituting X' for X; (3) calculate the
range for recovery at the spike concentration as (100 X'/T)2.44(100 S'/T)%. \8\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 m/L of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \9\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. Fill the sample bottles and, if
residual chlorine is present, add 80 mg of sodium thiosulfate per liter
of sample and mix well. EPA Methods 330.4 and 330.5 may be used for
measurement of residual chlorine. \10\ Field test kits are available for
this purpose.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 Add 60 mL methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2 min
with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time,
[[Page 194]]
combining the extracts in the Erlenmeyer flask. Perform a third
extraction in the same manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
Note: Some of the haloethers are very volatile and significant
losses will occur in concentration steps if care is not exercised. It is
important to maintain a constant gentle evaporation rate and not to
allow the liquid volume to fall below 1 to 2 mL before removing the K-D
apparatus from the hot water bath.
10.7 Momentarily remove the Snyder column, add 50 mL of hexane and a
new boiling chip, and reattach the Snyder column. Raise the temperature
of the water bath to 85 to 90 [deg]C. Concentrate the extract as in
Section 10.6, except use hexane to prewet the column. The elapsed time
of concentration should be 5 to 10 min.
10.8 Remove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of hexane. A 5-mL
syringe is recommended for this operation. Stopper the concentrator tube
and store refrigerated if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial. If the sample
extract requires no further cleanup, proceed with gas chromatographic
analysis (Section 12). If the sample requires further cleanup, proceed
to Section 11.
10.9 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use the procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the method as revised
to incorporate the cleanup procedure.
11.2 Florisil column cleanup for haloethers:
11.2.1 Adjust the sample extract volume to 10 mL.
11.2.2 Place a weight of Florisil (nominally 20 g) predetermined by
calibration (Section 7.5), into a chromatographic column. Tap the column
to settle the Florisil and add 1 to 2 cm of anhydrous sodium sulfate to
the top.
11.2.3 Preelute the column with 50 to 60 mL of petroleum ether.
Discard the eluate and just prior to exposure of the sodium sulfate
layer to the air, quantitatively transfer the sample extract onto the
column by decantation and subsequent petroleum ether washings. Discard
the eluate. Just prior to exposure of the sodium sulfate layer to the
air, begin eluting the column with 300 mL of ethyl ether/petroleum ether
(6+94) (V/V). Adjust the elution rate to approximately 5 mL/min and
collect the eluate in a 500-mL K-D flask equipped with a 10-mL
concentrator tube. This fraction should contain all of the haloethers.
11.2.4 Concentrate the fraction as in Section 10.6, except use
hexane to prewet the column. When the apparatus is cool, remove the
Snyder column and rinse the flask and its lower joint into the
concentrator tube with hexane. Adjust the volume of the cleaned up
extract to 10 mL with hexane and analyze by gas chromatography (Section
12).
12. Gas Chromatography
12.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Examples of the separations
achieved by Columns 1 and 2 are shown in Figures 1 and 2, respectively.
Other packed or capillary (open-tubular) columns, chromatographic
conditions, or detectors may be used if the requirements of Section 8.2
are met.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
thoroughly immediately before injection into the gas chromatrograph.
[[Page 195]]
12.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush technique. \11\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, the
total extract volume, and the resulting peak size in area or peak height
units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weight heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.7 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.117
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.118
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \12\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 4 x MDL to 1000 x MDL. \12\
14.3 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 1.0 to 626 [micro]/L. \12\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Haloethers in Industrial and Municipal
Wastewaters,'' EPA 600/4-81-062, National Technical Information Service,
PB81-232290, Springfield, Virginia 22161, July 1981.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constitutents,'' American Society for Testing and Materials,
Philadelphia.
4. ``Carcinogens--Working Carcinogens, '' Department of Health,
Education, and Welfare, Public Health Services, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Mills., P.A. ``Variation of Florisil Activity: Simple Method for
Measuring Absorbent Capacity and Its Use in Standardizing
[[Page 196]]
Florisil Columns,'' Journal of the Association of Official Analytical
Chemists, 51, 29 (1968).
8. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
9. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
10. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
11. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
12. ``EPA Method Study 21, Method 611, Haloethers,'' EPA 600/4-84-
052, National Technical Information Service, PB84-205939, Springfield,
Virginia 22161, June 1984.
Table 1--Chromatographic Conditions and Methods Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
---------------------- detection
Parameters limit
Column 1 Column 2 ([micro]/
L)
------------------------------------------------------------------------
Bis(2-chloroisopropyl) ether........... 8.4 9.7 0.8
Bis(2-chloroethyl) ether............... 9.3 9.1 0.3
Bis(2-chloroethoxy) methane............ 13.1 10.0 0.5
4-Chlorophenyl ether................... 19.4 15.0 3.9
4-Bromophenyl phenyl ether............. 21.2 16.2 2.3
------------------------------------------------------------------------
AColumn 1 conditions: Supelcoport (100/120 mesh) coated with 3% SP-1000
packed in a 1.8 m long x 2 mm ID glass column with helium carrier gas
at 40 mL/min. flow rate. Column temperature held at 60 [deg]C for 2
min. after injection then programmed at 8 [deg]C/min. to 230 [deg]C
and held for 4 min. Under these conditions the retention time for
Aldrin is 22.6 min.
AColumn 2 conditions: Tenax-GC (60/80 mesh) packed in a 1.8 m long x
2mm ID glass column with helium carrier gas at 40 mL/min. flow rate.
Column temperature held at 150 [deg]C for 4 min. after injection then
programmed at 16 [deg]C/min. to 310 [deg]C. Under these conditions the
retention time for Aldrin is 18.4 min.
Table 2--QC Acceptance Criteria--Method 611
----------------------------------------------------------------------------------------------------------------
Range for X
Test conc. Limit for s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/L) L) P, Ps
L) percent
----------------------------------------------------------------------------------------------------------------
Bis (2-chloroethyl)ether................................... 100 26.3 26.3-136.8 11-152
Bis (2-chloroethoxy)methane................................ 100 25.7 27.3-115.0 12-128
Bis (2-chloroisopropyl)ether............................... 100 32.7 26.4-147.0 9-165
4-Bromophenyl phenyl ether................................. 100 39.3 7.6 -167.5 D-189
4-Chlorophenyl phenyl ether................................ 100 30.7 15.4-152.5 D-170
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 611
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Bis(2-chloroethyl) ether........................................ 0.81C+0.54 0.19X+0.28 0.35X+0,36
Bis(2-chloroethoxy) methane..................................... 0.71C+0.13 0.20X+0.15 0.33X+0.11
Bis(2-chloroisopropyl) ether.................................... 0.85C+1.67 0.20X+1.05 0.36X+0.79
4-Bromophenyl phenyl ether...................................... 0.85C+2.55 0.25X+0.21 0.47X+0.37
4-Chlorophenyl phenyl ether..................................... 0.82C+1.97 0.18X+2.13 0.41X+0.55
----------------------------------------------------------------------------------------------------------------
X' = Expected recovery for one or more measuremelts of a sample containing a concentration of C, in [micro]g/L.
sr' = Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S' = Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C =True value for the concentration, in [micro]g/L.
X = Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
[[Page 197]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.034
[[Page 198]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.035
Method 612--Chlorinated Hydrocarbons
1. Scope and Application
1.1 This method covers the determination of certain chlorinated
hydrocarbons. The following parameters can be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
2-Chloronaphthalene.............................. 34581 91-58-7
1,2-Dichlorobenzene.............................. 34536 95-50-1
1,3-Dichlorobenzene.............................. 34566 541-73-1
1,4-Dichlorobenzene.............................. 34571 106-46-7
Hexachlorobenzene................................ 39700 118-74-1
Hexachlorobutadiene.............................. 34391 87-68-3
Hexachlorocyclopentadiene........................ 34386 77-47-4
Hexachloroethane................................. 34396 67-72-1
[[Page 199]]
1,2,4-Trichlorobenzene........................... 34551 120-82-1
------------------------------------------------------------------------
1.2 This is a gas chromatographic (GC) method applicable to the
determination of the compounds listed above in municipal and industrial
discharges as provided under 40 CFR 136.1. When this method is used to
analyze unfamiliar samples for any or all of the compounds above,
compound identifications should be supported by at least one additional
qualitative technique. This method describes a second gas
chromatographic column that can be used to confirm measurements made
with the primary column. Method 625 provides gas chromatograph/mass
spectrometer (GC/MS) conditions appropriate for the qualitative and
quantitative confirmation of results for all of the parameters listed
above, using the extract produced by this method.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.4 The sample extraction and concentration steps in this method are
essentially the same as in Methods 606, 608, 609, and 611. Thus, a
single sample may be extracted to measure the parameters included in the
scope of each of these methods. When cleanup is required, the
concentration levels must be high enough to permit selecting aliquots,
as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select chromatographic
conditions appropriate for the simultaneous measurement of combinations
of these parameters.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph and in the
interpretation of gas chromatograms. Each analyst must demonstrate the
ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is extracted
with methylene chloride using a separatory funnel. The methylene
chloride extract is dried and exchanged to hexane during concentration
to a volume of 10 mL or less. The extract is separated by gas
chromatography and the parameters are then measured with an electron
capture detector. \2\
2.2 The method provides a Florisil column cleanup procedure to aid
in the elimination of interferences that may be encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in gas chromatograms. All
of these materials must be routinely demonstrated to be free from
interferences under the conditions of the analysis by running laboratory
reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled. The
cleanup procedure in Section 11 can be used to overcome many of these
interferences, but unique samples may require additional cleanup
approaches to achieve the MDL listed in Table 1.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all
[[Page 200]]
personnel involved in the chemical analysis. Additional references to
laboratory safety are available and have been identified 4-6
for the information of the analyst.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1cL or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, approximately 400 mm
long x 19 mm ID, with coarse frit filter disc.
5.2.3 Chromatographic column--300 long x 10 mm ID, with Teflon
stopcock and coarse frit filter disc at bottom.
5.2.4 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.5 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.6 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 Gas chromatograph--An analytical system complete with gas
chromatograph suitable for on-column injection and all required
accessories including syringes, analytical columns, gases, detector, and
strip-chart recorder. A data system is recommended for measuring peak
areas.
5.6.1 Column 1--1.8 m long x 2 mm ID glass, packed with 1% SP-1000
on Supelcoport (100/120 mesh) or equivalent. Guidelines for the use of
alternate column packings are provide in Section 12.1.
5.6.2 Column 2--1.8 m long x2 mm ID glass, packed with 1.5% OV-1/
2.4% OV-225 on Supelcoport (80/100 mesh) or equivalent. This column was
used to develop the method performance statements in Section 14.
5.6.3 Detector--Electron capture detector. This detector has proven
effective in the analysis of wastewaters for the parameters listed in
the scope (Section 1.1), and was used to develop the method performance
statements in Section 14. Guidelines for the use of alternate detectors
are provided in Section 12.1.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Acetone, hexane, isooctane, methanol, methylene chloride,
petroleum ether (boiling range 30 to 60 [deg]C)--Pesticide quality or
equivalent.
6.3 Sodium sulfate--(ACS) Granular, anhydrous. Purify heating at 400
[deg]C for 4 h in a shallow tray.
6.4 Florisil--PR grade (60/100 mesh). Purchase activated at 1250
[deg]F and store in the dark in glass containers with ground glass
stoppers or foil-lined screw caps. Before use, activate each batch at
least 16 h at 130 [deg]C in a foil-covered glass container and allow to
cool.
6.5 Stock standard solution (1.00 [micro]g/[micro]L)--Stock standard
solutions can be prepared from pure standard materials or purchased as
certified solutions.
6.5.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in isooctane and dilute
to volume in a 120-mL volumetric flask. Larger volumes can be used at
the convenience of the analyst. When compound purity is assayed to be
96% or greater, the weight can be used without correction to calculate
the concentration of the stock standard. Commercially prepared stock
standards can be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.5.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
[[Page 201]]
6.5.3 Stock standard solutions must be replaced after six months, or
sooner if comparision with check standards indicates a problem.
6.6 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating conditions equivalent to
those given in Table 1. The gas chromatographic system can be calibrated
using the external standard technique (Section 7.2) or the internal
standard technique (Section 7.3).
7.2 External standard calibration procedure:
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask and diluting to volume
with isooctane. One of the external standards should be at a
concentration near, but above, the MDL (Table 1) and the other
concentrations should correspond to the expected range of concentrations
found in real samples or should define the working range of the
detector.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against the mass injected. The results can be used to prepare
a calibration curve for each compound. Alternatively, if the ratio of
response to amount injected (calibration factor) is a constant over the
working range (<10% relative standard deviation, RSD), linearity through
the origin can be assumed and the average ratio or calibration factor
can be used in place of a calibration curve.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select one or more internal standards that are similar
in analytical behavior to the compounds of interest. The analyst must
further demonstrate that the measurement of the internal standard is not
affected by method or matrix interferences. Because of these
limitations, no internal standard can be suggested that is applicable to
all samples.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding volumes of
one or more stock standards to a volumetric flask. To each calibration
standard, add a known constant amount of one or more internal standards,
and dilute to volume with isooctane. One of the standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the detector.
7.3.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 12 and tabulate peak height or area
responses against concentration for each compound and internal standard.
Calculate response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.119
Equation 1
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<10% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve, calibration factor, or RF must be
verified on each working day by the measurement of one or more
calibration standards. If the response for any parameter varies from the
predicted response by more than 15%, a new
calibration curve must be prepared for that compound.
7.5 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When the results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
[[Page 202]]
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.4, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such modification is made to the method,
the analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at the following concentrations in
acetone: Hexachloro-substituted parameters, 10 [micro]g/mL; any other
chlorinated hydrocarbon, 100 [micro]g/mL. The QC check sample
concentrate must be obtained from the U.S. Environmental Protection
Agency, Environmental Monitoring and Support Laboratory in Cincinnati,
Ohio, if available. If not available from that source, the QC check
sample concentrate must be obtained from another external source. If not
available from either source above, the QC check sample concentrate must
be prepared by the laboratory using stock standards prepared
independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at the test
concentrations shown in Table 2 by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 2. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 2 presents a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.2.
8.2.6.2 Beginning with Section 8.2.2, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spike sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at the test concentration in Section 8.2.2 or 1 to 5
times higher than the background concentration determined in Section
8.3.2, whichever concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none by (2) the larger of either 5 times higher than the expected
background concentration or the test concentration in Section 8.2.2.
[[Page 203]]
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. In necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100 (A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\ If spiking was performed at a concentration lower than the test
concentration in Section 8.2.2, the analyst must use either the QC
acceptance criteria in Table 2, or optional QC acceptance criteria
calculated for the specific spike concentration. To calculate optional
acceptance criteria for the recovery of a parameter: (1) Calculate
accuracy (X') using the equation in Table 3, substituting the spike
concentration (T) for C; (2) calculate overall precision (S') using the
equation in Table 3, substituting X' for X; (3) calculate the range for
recovery at the spike concentration as (100 X'/T) 2.44 (100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4. If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Sections 8.2.1 or 8.3.2) to 1 L of reagent water.
The QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
2. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment for each parameter
on a regular basis (e.g. after each five to ten new accuracy
measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. When doubt exists over the
identification of a peak on the chromatogram, confirmatory techniques
such as gas chromatography with a dissimilar column, specific element
detector, or mass spectrometer must be used. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevent performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \8\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
[[Page 204]]
10.2 Add 60 mL of methylele chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2 min
with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.3 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.4 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.5 Pour the combined extract through a solvent-rinsed drying
column containing about 10 cm of anhydrous sodium sulfate, and collect
the extract in the K-D concentrator. Rinse the Erlenmeyer flask and
column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.6 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 to 2 mL, remove the K-D apparatus and allow it to
drain and cool for at least 10 min.
Note: The dichloribenzenes have a sufficiently high volatility that
significant losses may occur in concentration steps if care is not
exercised. It is important to maintain a constant gentle evaporation
rate and not to allow the liquid volume to fall below 1 to 2 mL before
removing the K-D apparatus from the hot water bath.
10.7 Momentarily remove the Snyder column, add 50 mL of hexane and a
new boiling chip, and reattach the Snyder column. Raise the tempeature
of the water bath to 85 to 90 [deg]C. Concentrate the extract as in
Section 10.6, except use hexane to prewet the column. The elapsed time
of concentration should be 5 to 10 min.
10.8 Romove the Snyder column and rinse the flask and its lower
joint into the concentrator tube with 1 to 2 mL of hexane. A 5-mL
syringe is recommended for this operation. Stopper the concentrator tube
and store refrigerated if further processing will not be performed
immediately. If the extract will be stored longer than two days, it
should be transferred to a Teflon-sealed screw-cap vial. If the sample
extract requires no further cleanup, proceed with gas chromatographic
analysis (Section 12). If the sample requires further cleanup, proceed
to Section 11.
10.9 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use the procedure below or any other
appropriate procedure. However, the analyst first must demonstrate that
the requirements of Section 8.2 can be met using the method as revised
to incorporate the cleanup procedure.
11.2 Florisil column cleanup for chlorinated hydrocarbons:
11.2.1 Adjust the sample extract to 10 mL with hexane.
11.2.2 Place 12 g of Florisil into a chromatographic column. Tap the
column to settle the Florisil and add 1 to 2 cm of anhydrous sodium
sulfate to the top.
11.2.3 Preelute the column with 100 mL of petroleum ether. Discard
the eluate and just prior to exposure of the sodium sulfate layer to the
air, quantitatively transfer the sample extract onto the column by
decantation and subsequent petroleum ether washings. Discard the eluate.
Just prior to exposure of the sodium sulfate layer to the air, begin
eluting the column with 200 mL of petroleum ether and collect the eluate
in a 500-mL K-D flask equipped with a 10-mL concentrator tube. This
fraction should contain all of the chlorinated hydrocarbons.
11.2.4 Concentrate the fraction as in Section 10.6, except use
hexane to prewet the column. When the apparatus is cool, remove the
Snyder column and rinse the flask and its lower joint into the
concentrator tube with hexane. Analyze by gas chromatography (Section
12).
[[Page 205]]
12. Gas Chromatography
12.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Examples of the separations
achieved by Columl 2 are shown in Figures 1 and 2. Other packed or
capillary (open-tubular) columns, chromatographic conditions, or
detectors may be used if the requirements of Section 8.2 are met.
12.2 Calibrate the system daily as described in Section 7.
12.3 If the internal standard calibration procedure is being used,
the internal standard must be added to the sample extract and mixed
throughly immediately before injection into the gas chromatograph.
12.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the gas chromatograph using the solvent-flush techlique. \9\ Smaller
(1.0 [micro]L) volumes may be injected if automatic devices are
employed. Record the volume injected to the nearest 0.05 [micro]L, the
total extract volume, and the resulting peak size in area or peak height
units.
12.5 Identify the parameters in the sample by comparing the
retention times of the peaks in the sample chromatogram with those of
the peaks in standard chromatograms. The width of the retention time
window used to make identifications should be based upon measurements of
actual retention time variations of standards over the course of a day.
Three times the standard deviation of a retention time for a compound
can be used to calculate a suggested window size; however, the
experience of the analyst should weigh heavily in the interpretation of
chromatograms.
12.6 If the response for a peak exceeds the working range of the
system, dilute the extract and reanalyze.
12.7 If the measurement of the peak response is prevented by the
presence of interferences, further cleanup is required.
13. Calculations
13.1 Determine the concentration of individual compounds in the
sample.
13.1.1 If the external standard calibration procedure is used,
calculate the amount of material injected from the peak response using
the calibration curve or calibration factor determined in Section 7.2.2.
The concentration in the sample can be calculated from Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.120
Equation 2
where:
A=Amount of material injected (ng).
Vi=Volume of extract injected ([micro]L).
Vt=Volume of total extract ([micro]L).
Vs=Volume of water extracted (mL).
13.1.2 If the internal standard calibration procedure is used,
calculate the concentration in the sample using the response factor (RF)
determined in Section 7.3.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.121
Equation 3
where:
As=Response for the parameter to be measured.
Ais=Response for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \10\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method has been tested for linearity of spike recovery
from reagent water and has been demonstrated to be applicable over the
concentration range from 4xMDL to 1000xMDL. \10\
14.3 This method was tested by 20 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 1.0 to 356 [micro]g/L. \11\ Single
operator precision, overall precision, and method accuracy were found to
be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of Chlorinated Hydrocarbons In Industrial and
Municipal Wastewaters, ``EPA 6090/4-84-ABC, National Technical
Information Service, PBXYZ, Springfield, Virginia, 22161 November 1984.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American
[[Page 206]]
Society for Testing and Materials, Philadelphia.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,''American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
9. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
10. ``Development of Detection Limits, EPA Method 612, Chlorinated
Hydrocarbons,'' Special letter report for EPA Contract 68-03-2625, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268.
11. ``EPA Method Study Method 612--Chlorinated Hydrocarbons,'' EPA
600/4-84-039, National Technical Information Service, PB84-187772,
Springfield, Virginia 22161, May 1984.
12. ``Method Performance for Hexachlorocyclopentadiene by Method
612,'' Memorandum from R. Slater, U.S. Environmental Protection Agency,
Environmental Monitoring and Support Laboratory, Cincinnati, Ohio 45268,
December 7, 1983.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Retention time (min) Method
-------------------------- detection
Parameter limit
Column 1 Column 2 ([micro]g/
L)
------------------------------------------------------------------------
1,3-Dichlorobenzene.............. 4.5 6.8 1.19
Hexachloroethane................. 4.9 8.3 0.03
1,4-Dichlorobenzene.............. 5.2 7.6 1.34
1,2-Dichlorobenzene.............. 6.6 9.3 1.14
Hexachlorobutadiene.............. 7.7 20.0 0.34
1,2,4-Trichlorobenzene........... 15.5 22.3 0.05
Hexachlorocyclopentadiene........ nd \c\ 16.5 0.40
2-Chloronaphthalene.............. \a\ 2.7 \b\ 3.6 0.94
Hexachlorobenzene................ \a\ 5.6 \b\ 10.1 0.05
------------------------------------------------------------------------
Column 1 conditions: Supelcoport (100/120 mesh) coated with 1% SP-1000
packed in a 1.8 m x 2 mm ID glass column with 5% methane/95% argon
carrier gas at 25 mL/min. flow rate. Column temperature held
isothermal at 65 [deg]C, except where otherwise indicated.
Column 2 conditions: Supelcoport (80/100 mesh) coated with 1.5% OV-1/
2.4% OV-225 packed in a 1.8 m x 2 mm ID glass column with 5% methane/
95% argon carrier gas at 25 mL/min. flow rate. Column temperature held
isothermal at 75 [deg]C, except where otherwise indicated.
nd=Not determined.
\a\ 150 [deg]C column temperature.
\b\ 165 [deg]C column temperature.
\c\ 100 [deg]C column temperature.
Table 2--QC Acceptance Criteria--Method 612
----------------------------------------------------------------------------------------------------------------
Limit for Range for X
Test conc. s ([micro]g/ Range for
Parameter ([micro]g/ ([micro]g/ L) P, Ps
L) L) (percent)
----------------------------------------------------------------------------------------------------------------
2-Chloronaphthalene............................................. 100 37.3 29.5-126.9 9-148
1,2-Dichlorobenzene............................................. 100 28.3 23.5-145.1 9-160
1,3-Dichlorobenzene............................................. 100 26.4 7.2-138.6 D-150
1,4-Dichlorobenzene............................................. 100 20.8 22.7-126.9 13-137
Hexachlorobenzene............................................... 10 2.4 2.6-14.8 15-159
Hexachlorobutadiene............................................. 10 2.2 D-12.7 D-139
Hexachlorocyclopentadiene....................................... 10 2.5 D-10.4 D-111
Hexachloroethane................................................ 10 3.3 2.4-12.3 8-139
1,2,4-Trichlorobenzene.......................................... 100 31.6 20.2-133.7 5-149
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
[[Page 207]]
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 612
----------------------------------------------------------------------------------------------------------------
Single analyst
Parameter Acccuracy, as recovery, precision, sr' Overall precision, S'
X' ([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
2-Chloronaphthalene................... 0.75C+3.21 0.28X-1.17 0.38X-1.39
1,2-Dichlorobenzene................... 0.85C-0.70 0.22X-2.95 0.41X-3.92
1,3-Dichlorobenzene................... 0.72C+0.87 0.21X-1.03 0.49X-3.98
1,4-Dichlorobenzene................... 0.72C+2.80 0.16X-0.48 0.35X-0.57
Hexachlorobenzene..................... 0.87C-0.02 0.14X+0.07 0.36X-0.19
Hexachlorobutadiene................... 0.61C+0.03 0.18X+0.08 0.53X-0.12
Hexachlorocyclopentadiene \a\......... 0.47C 0.24X 0.50X
Hexachloroethane...................... 0.74C-0.02 0.23X+0.07 0.36X-0.00
1,2,4-Trichlorobenzene................ 0.76C+0.98 0.23X-0.44 0.40X-1.37
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
\a\ Estimates based upon the performance in a single laboratory. \12\
[[Page 208]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.036
[[Page 209]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.037
[[Page 210]]
Method 613--2,3,7,8-Tetrachlorodibenzo-p-Dioxin
1. Scope and Application
1.1 This method covers the determination of 2,3,7,8-
tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD). The following parameter may
be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. GAS No.
------------------------------------------------------------------------
2,3,7,8-TCDD..................................... 34675 1746-01-6
------------------------------------------------------------------------
1.2 This is a gas chromatographic/mass spectrometer (GC/MS) method
applicable to the determination of 2,3,7,8-TCDD in municipal and
industrial discharges as provided under 40 CFR 136.1. Method 625 may be
used to screen samples for 2,3,7,8-TCDD. When the screening test is
positive, the final qualitative confirmation and quantification must be
made using Method 613.
1.3 The method detection limit (MDL, defined in Section 14.1) \1\
for 2,3,7,8-TCDD is listed in Table 1. The MDL for a specific wastewater
may be different from that listed, depending upon the nature of
interferences in the sample matrix.
1.4 Because of the extreme toxicity of this compound, the analyst
must prevent exposure to himself, of to others, by materials knows or
believed to contain 2,3,7,8-TCDD. Section 4 of this method contains
guidelines and protocols that serve as minimum safe-handling standards
in a limited-access laboratory.
1.5 Any modification of this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph/mass spectrometer
and in the interpretation of mass spectra. Each analyst must demonstrate
the ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is spiked with
an internal standard of labeled 2,3,7,8-TCDD and extracted with
methylene chloride using a separatory funnel. The methylene chloride
extract is exchanged to hexane during concentration to a volume of 1.0
mL or less. The extract is then analyzed by capillary column GC/MS to
separate and measure 2,3,7,8-TCDD. \2,3\
2.2 The method provides selected column chromatographic cleanup
proceudres to aid in the elimination of interferences that may be
encountered.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated backgrounds at the masses (m/z)
monitored. All of these materials must be routinely demonstrated to be
free from interferences under the conditions of the analysis by running
laboratory reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \4\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by the treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thorough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to
mininmize interference problems. Purification of solvents by
distillation in all-glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are
coextracted from the sample. The extent of matrix interferences will
vary considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled.
2,3,7,8-TCDD is often associated with other interfering chlorinated
compounds which are at concentrations several magnitudes higher than
that of 2,3,7,8-TCDD. The cleanup producers in Section 11 can be used to
overcome many of these interferences, but unique samples may require
additional cleanup approaches \1,5-7\ to eliminate false positives and
achieve the MDL listed in Table 1.
3.3 The primary column, SP-2330 or equivalent, resolves 2,3,7,8-TCDD
from the other 21 TCDD insomers. Positive results using any other gas
chromatographic column must be confirmed using the primary column.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to
[[Page 211]]
the lowest possible level by whatever means available. The laboratory is
responsible for maintaining a current awareness file of OSHA regulations
regarding the safe handling of the chemicals specified in this method. A
reference file of material data handling sheets should also be made
available to all personnel involved in the chemical analysis. Additional
references to laboratory safety are available and have been identified
8-10 for the information of the analyst. Benzene and 2,3,7,8-
TCDD have been identified as suspected human or mammalian carcinogens.
4.2 Each laboratory must develop a strict safety program for
handling 2,3,7,8-TCDD. The following laboratory practices are
recommended:
4.2.1 Contamination of the laboratory will be minimized by
conducting all manipulations in a hood.
4.2.2 The effluents of sample splitters for the gas chromatograph
and roughing pumps on the GC/MS should pass through either a column of
activated charcoal or be bubbled through a trap containing oil or high-
boiling alcohols.
4.2.3 Liquid waste should be dissolved in methanol or ethanol and
irradiated with ultraviolet light with a wavelength greater than 290 nm
for several days. (Use F 40 BL lamps or equivalent). Analyze liquid
wastes and dispose of the solutions when 2,3,7,8-TCDD can no longer be
detected.
4.3 Dow Chemical U.S.A. has issued the following precautimns
(revised November 1978) for safe handling of 2,3,7,8-TCDD in the
laboratory:
4.3.1 The following statements on safe handling are as complete as
possible on the basis of available toxicological information. The
precautions for safe handling and use are necessarily general in nature
since detailed, specific recommendations can be made only for the
particular exposure and circumstances of each individual use. Inquiries
about specific operations or uses may be addressed to the Dow Chemical
Company. Assistance in evaluating the health hazards of particular plant
conditions may be obtained from certain consulting laboratories and from
State Departments of Health or of Labor, many of which have an
industrial health service. 2,3,7,8-TCDD is extremely toxic to laboratory
animals. However, it has been handled for years without injury in
analytical and biological laboratories. Techniques used in handling
radioactive and infectious materials are applicable to 2,3,7,8,-TCDD.
4.3.1.1 Protective equipment--Throw-away plastic gloves, apron or
lab coat, safety glasses, and a lab hood adequate for radioactive work.
4.3.1.2 Training--Workers must be trained in the proper method of
removing contaminated gloves and clothing without contacting the
exterior surfaces.
4.3.1.3 Personal hygiene--Thorough washing of hands and forearms
after each manipulation and before breaks (coffee, lunch, and shift).
4.3.1.4 Confinement--Isolated work area, posted with signs,
segregated glassware and tools, plastic-backed absorbent paper on
benchtops.
4.3.1.5 Waste--Good technique includes minimizing contaminated
waste. Plastic bag liners should be used in waste cans. Janitors must be
trained in the safe handling of waste.
4.3.1.6 Disposal of wastes--2,3,7,8-TCDD decomposes above 800
[deg]C. Low-level waste such as absorbent paper, tissues, animal
remains, and plastic gloves may be burned in a good incinerator. Gross
quantities (milligrams) should be packaged securely and disposed through
commercial or governmental channels which are capable of handling high-
level radioactive wastes or extremely toxic wastes. Liquids should be
allowed to evaporate in a good hood and in a disposable container.
Residues may then be handled as above.
4.3.1.7 Decontamination--For personal decontamination, use any mild
soap with plenty of scrubbing action. For decontamination of glassware,
tools, and surfaces, Chlorothene NU Solvent (Trademark of the Dow
Chemical Company) is the least toxic solvent shown to be effective.
Satisfactory cleaning may be accomplished by rinsing with Chlorothene,
then washing with any detergent and water. Dishwater may be disposed to
the sewer. It is prudent to minimize solvent wastes because they may
require special disposal through commercial sources which are expensive.
4.3.1.8 Laundry--Clothing known to be contaminated should be
disposed with the precautions described under Section 4.3.1.6. Lab coats
or other clothing worn in 2,3,7,8-TCDD work areas may be laundered.
Clothing should be collected in plastic bags. Persons who convey the
bags and launder the clothing should be advised of the hazard and
trained in proper handling. The clothing may be put into a washer
without contact if the launderer knows the problem. The washer should be
run through a cycle before being used again for other clothing.
4.3.1.9 Wipe tests--A useful method of determining cleanliness of
work surfaces and tools is to wipe the surface with a piece of filter
paper. Extraction and analysis by gas chromatography can achieve a limit
of sensitivity of 0.1 [micro]g per wipe. Less than 1 [micro]g of
2,3,7,8-TCDD per sample indicates acceptable cleanliness; anything
higher warrants further cleaning. More than 10 [micro]g on a wipe sample
constitutes an acute hazard and requires prompt cleaning before further
use of the equipment or work space. A high (10 [micro]g)
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2,3,7,8-TCDD level indicates that unacceptable work practices have been
employed in the past.
4.3.1.10 Inhalation--Any procedure that may produce airborne
contamination must be done with good ventilation. Gross losses to a
ventilation system must not be allowed. Handling of the dilute solutions
normally used in analytical and animal work presents no inhalation
hazards except in the case of an accident.
4.3.1.11 Accidents--Remove contaminated clothing immediately, taking
precautions not to contaminate skin or other articles. Wash exposed skin
vigorously and repeatedly until medical attention is obtained.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composite sampling.
5.1.1 Grab sample bottle--1-L or 1-qt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. Before use, however, the compressible tubing should
be thoroughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.1.3 Clearly label all samples as ``POISON'' and ship according to
U.S. Department of Transportation regulations.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnels--2-L and 125-mL, with Teflon stopcock.
5.2.2 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.3 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-570001-
0500 or equivalent). Attach to concentrator tube with springs.
5.2.4 Snyder column, Kuderna-Danish--Three-ball macro (Kontes K-
503000-0121 or equivalent).
5.2.5 Snyder column, Kuderna-Danish--Two-ball micro (Kontes K-
569001-0219 or equivalent).
5.2.6 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.7 Chromatographic column--300 mm long x 10 mm ID, with Teflon
stopcock and coarse frit filter disc at bottom.
5.2.8 Chromatographic column--400 mm long x 11 mm ID, with Teflon
stopcock and coarse frit filter disc at bottom.
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min or Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2 [deg]C). The bath should be
used in a hood.
5.5 GC/MS system:
5.5.1 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph and all required accessories
including syringes, analytical columns, and gases. The injection port
must be designed for capillary columns. Either split, splitless, or on-
column injection techniques may be employed, as long as the requirements
of Section 7.1.1 are achieved.
5.5.2 Column--60 m long x 0.25 mm ID glass or fused silica, coated
with SP-2330 (or equivalent) with a film thickness of 0.2 [micro]m. Any
equivalent column must resolve 2, 3, 7, 8-TCDD from the other 21 TCDD
isomers. \16\
5.5.3 Mass spectrometer--Either a low resolution mass spectrometer
(LRMS) or a high resolution mass spectrometer (HRMS) may be used. The
mass spectrometer must be equipped with a 70 V (nominal) ion source and
be capable of aquiring m/z abundance data in real time selected ion
monitoring (SIM) for groups of four or more masses.
5.5.4 GC/MS interface--Any GC to MS interface can be used that
achieves the requirements of Section 7.1.1. GC to MS interfaces
constructed of all glass or glass-lined materials are recommended. Glass
surfaces can be deactivated by silanizing with dichlorodimethylsilane.
To achieve maximum sensitivity, the exit end of the capillary column
should be placed in the ion source. A short piece of fused silica
capillary can be used as the interface to overcome problems associated
with straightening the exit end of glass capillary columns.
5.5.5 The SIM data acquired during the chromatographic program is
defined as the Selected Ion Current Profile (SICP). The SICP can be
acquired under computer control or as a real time analog output. If
computer control is used, there must be software available to plot the
SICP and report peak height or area data for any m/z in the SICP between
specified time or scan number limits.
5.6 Balance--Analytical, capable of accurately weighing 0.0001 g.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of 2, 3, 7, 8-TCDD.
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6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL. Wash the solution with methylene
chloride and hexane before use.
6.3 Sodium thiosulfate--(ACS) Granular.
6.4 Sulfuric acid--Concentrated (ACS, sp. gr. 1.84).
6.5 Acetone, methylene chloride, hexane, benzene, ortho-xylene,
tetradecane--Pesticide quality or equivalent.
6.6 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.7 Alumina--Neutral, 80/200 mesh (Fisher Scientific Co., No. A-540
or equivalent). Before use, activate for 24 h at 130 [deg]C in a foil-
covered glass container.
6.8 Silica gel--High purity grade, 100/120 mesh (Fisher Scientific
Co., No. S-679 or equivalent).
6.9 Stock standard solutions (1.00 [micro]g/[micro]L)--Stock
standard solutimns can be prepared from pure standard materials or
purchased as certified solutions. Acetone should be used as the solvent
for spiking solutions; ortho-xylene is recommended for calibration
standards for split injectors; and tetradecane is recommended for
splitless or on-colum injectors. Analyze stock internal standards to
verify the absence of native 2,3,7,8-TCDD.
6.9.1 Prepare stock standard solutions of 2,3,7,8-TCDD (mol wt 320)
and either \37\C14 2,3,7,8-TCDD (mol wt 328) or
\13\C112 2,3,7,8-TCDD (mol wt 332) in an isolated area by
accurately weighing about 0.0100 g of pure material. Dissolve the
material in pesticide quality solvent and dilute to volume in a 10-mL
volumetric flask. When compound purity is assayed to be 96% or greater,
the weight can be used without correction to calculate the concentration
of the stock standard. Commercially prepared stock standards can be used
at any concentration if they are certified by the manufacturer or by an
independent source.
6.9.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store in an isolated refrigerator protected from
light. Stock standard solutions should be checked frequently for signs
of degradation or evaporation, especially just prior to preparing
calibration standards or spiking solutions from them.
6.9.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with check standards indicates a problem.
6.10 Internal standard spiking solution (25 ng/mL)--Using stock
standard solution, prepare a spiking solution in acetone of either \13\
Cl12 or \37\ Cl4 2,3,7,8-TCDD at a concentration
of 25 ng/mL. (See Section 10.2)
6.11 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatograhic operating conditions equivalent to
those given in Table 1 and SIM conditions for the mass spectrometer as
described in Section 12.2 The GC/MS system must be calibrated using the
internal standard technique.
7.1.1 Using stock standards, prepare calibration standards that will
allow measurement of relative response factors of at least three
concentration ratios of 2,3,7,8-TCDD to internal standard. Each
calibration standard must be prepared to contain the internal standard
at a concentration of 25 ng/mL. If any interferences are contributed by
the internal standard at m/z 320 and 322, its concentration may be
reduced in the calibration standards and in the internal standard
spiking solution (Section 6.10). One of the calibration standards should
contain 2,3,7,8-TCDD at a concentration near, but above, the MDL and the
other 2,3,7,8-TCDD concentrations should correspond to the expected
range of concentrations found in real samples or should define the
working range of the GC/MS system.
7.1.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standardaccording to Section 12 and tabulate peak height or area
response against the concentration of 2,3,7,8-TCDD and internal
standard. Calculate response factors (RF) for 2,3,7,8-TCDD using
Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.122
Equation 1
where:
As=SIM response for 2,3,7,8-TCDD m/z 320.
Ais=SIM response for the internal standard, m/z 332 for \13\
C12 2,3,7,8-TCDD m/z 328 for \37\ Cl4 2,3,7,8-
TCDD.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of 2,3,7,8-TCDD ([micro]g/L).
If the RF value over the working range is a constant (<10% relative
standard deviation, RSD), the RF can be assumed to be invariant and the
average RF can be used for calculations. Alternatively, the results can
be used to plot a calibration curve of response ratios, As/
Ais, vs. RF.
7.1.3 The working calibration curve or RF must be verified on each
working day by the measurement of one or more 2,3,7,8-TCDD calibration
standards. If the response for 2,3,7,8-TCDD varies from the predicted
response by more than 15%, the test must be
repeated using a fresh calibration standard. Alternatively, a new
calibration curve must be prepared.
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7.2 Before using any cleanup procedure, the analyst must process a
series of calibration standards through the procedure to validate
elution patterns and the absence of interferences from the reagents.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.5, 11.1, and 12.1) to improve the separations or lower the
cost of measurements. Each time such a modification is made to the
method, the analyst is required to repeat the procedure in Section 8.2
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 10% of all samples with native 2,3,7,8-TCDD to monitor and
evaluate laboratory data quality. This procedure is described in Section
8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 10% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing 2,3,7,8-TCDD at a concentration of 0.100 [micro]g/mL in
acetone. The QC check sample concentrate must be obtained from the U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory in Cincinnati, Ohio, if available. If not available from that
source, the QC check sample concentrate must be obtained from another
external source. If not available from either source above, the QC check
sample concentrate must be prepared by the laboratory using stock
standards prepared independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
0.100 [micro]g/L (100 ng/L) by adding 1.00 mL of QC check sample
concentrate to each of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for 2,3,7,8-TCDD
using the four results.
8.2.5 Compare s and (X) with the corresponding acceptance criteria
for precision and accuracy, respectively, found in Table 2. If s and X
meet the acceptance criteria, the system performance is acceptable and
analysis of actual samples can begin. If s exceeds the precision limit
or X falls outside the range for accuracy, the system performance is
unacceptable for 2,3,7,8-TCDD. Locate and correct the source of the
problem and repeat the test beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 10% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing one to ten samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of
2,3,7,8-TCDD in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of 2,3,7,8-TCDD in the sample is not
being checked against a limit specific to that parameter, the spike
should be at 0.100 [micro]g/L or 1 to 5 times higher than the background
concentration determined in Section 8.3.2, whichever concentration would
be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the
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spike concentration should be (1) the regulatory concentration limit, if
any; or, if none (2) the larger of either 5 times higher than the
expected background concentration or 0.100 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of 2,3,7,8-TCDD. If necessary, prepare a new QC check
sample concentrate (Section 8.2.1) appropriate for the background
concentration in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of 2,3,7,8-TCDD. Calculate percent
recovery (P) as 100(A-B)%T, where T is the known true value of the
spike.
8.3.3 Compare the percent recovery (P) for 2,3,7,8-TCDD with the
corresponding QC acceptance criteria found in Table 2. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\11\ If spiking was performed at a concentration lower than 0.100
[micro]g/L, the analyst must use either the QC acceptance criteria in
Table 2, or optional QC acceptance criteria calculated for the specific
spike concentration. To calculate optional acceptance criteria for the
recovery of 2,3,7,8-TCDD: (1) Calculate accuracy (X') using the equation
in Table 3, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 3,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T)2.44(100 S'/T)%. \11\
8.3.4 If the recovery of 2,3,7,8-TCDD falls outside the designated
range for recovery, a check standard must be analyzed as described in
Section 8.4.
8.4 If the recovery of 2,3,7,8-TCDD fails the acceptance criteria
for recovery in Section 8.3, a QC check standard must be prepared and
analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the complexity of the sample matrix and the performance
of the laboratory.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of 2,3,7,8-TCDD. Calculate the percent recovery
(Ps) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) with the
corresponding QC acceptance criteria found in Table 2. If the recovery
of 2,3,7,8-TCDD falls outside the designated range, the laboratory
performance is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for 2,3,7,8-
TCDD in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the spandard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P-2sp to P+2sp.
If P=90% and sp=10%, for example, the accuracy interval is
expressed as 70-110%. Update the accuracy assessment on a regular basis
(e.g. after each five to ten new accuracy measurements).
8.6 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \12\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All samples must be iced or refrigerated at 4 [deg]C and
protected from light from the time of collection until extraction. Fill
the sample bottles and, if residual chlorine is present, add 80 mg of
sodium thiosulfate per liter of sample and mix well. EPA Methods 330.4
and 330.5 may be used for measurement of residual chlorine. \13\ Field
test kits are available for this purpose.
9.3 Label all samples and containers ``POISON'' and ship according
to applicable U.S. Department of Transportation regulations.
9.4 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction. \2\
10. Sample Extraction
Caution: When using this method to analyze for 2,3,7,8-TCDD, all of
the following operations must be performed in a limited-access
laboratory with the analyst wearing full
[[Page 216]]
protective covering for all exposed skin surfaces. See Section 4.2.
10.1 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel.
10.2 Add 1.00 mL of internal standard spiking solution to the sample
in the separatory funnel. If the final extract will be concentrated to a
fixed volume below 1.00 mL (Section 12.3), only that volume of spiking
solution should be added to the sample so that the final extract will
contain 25 ng/mL of internal standard at the time of analysis.
10.3 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the vmlume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask.
10.4 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner.
10.5 Assemble a Kuderna-Danish (K-D) concentrator by attaching a 10-
mL concentrator tube to a 500-mL evaporative flask. Other concentration
devices or techniques may be used in place of the K-D concentrator if
the requirements of Section 8.2 are met.
10.6 Pour the combined extract into the K-D concentrator. Rinse the
Erlenmeyer flask with 20 to 30 mL of methylele chloride to complete the
quantitative transfer.
10.7 Add one or two clean boiling chips to the evaporative flask and
attach a three-ball Snyder column. Prewet the Snyder column by adding
about 1 mL of methylene chloride to the top. Place the K-D apparatus on
a hot water bath (60 to 65 [deg]C) so that the concentrator tube is
partially immersed in the hot water, and the entire lower rounded
surface of the flask is bathed with hot vapor. Adjust the vertical
position of the apparatus and the water temperature as required to
complete the concentration in 15 to 20 min. At the proper rate of
distillation the balls of the column will actively chatter but the
chambers will not flood with condensed solvent. When the apparent volume
of liquid reaches 1 mL, remove the K-D apparatus and allow it to drain
and cool for at least 10 min.
10.8 Momentarily remove the Snyder column, add 50 mL of hexane and a
new boiling chip, and reattach the Snyder column. Raise the temperature
of the water bath to 85 to 90[deg]C. Concentrate the extract as in
Section 10.7, except use hexane to prewet the column. Remove the Snyder
column and rinse the flask and its lower joint into the concentrator
tube with 1 to 2 mL of hexane. A 5-mL syringe is recommended for this
operation. Set aside the K-D glassware for reuse in Section 10.14.
10.9 Pour the hexane extract from the concentrator tube into a 125-
mL separatory funnel. Rinse the concentrator tube four times with 10-mL
aliquots of hexane. Combine all rinses in the 125-mL separatory funnel.
10.10 Add 50 mL of sodium hydroxide solution to the funnel and shake
for 30 to 60 s. Discard the aqueous phase.
10.11 Perform a second wash of the organic layer with 50 mL of
reagent water. Discard the aqueous phase.
10.12 Wash the hexane layer with a least two 50-mL aliquots of
concentrated sulfuric acid. Continue washing the hexane layer with 50-mL
aliquots of concentrated sulfuric acid until the acid layer remains
colorless. Discard all acid fractions.
10.13 Wash the hexane layer with two 50-mL aliquots of reagent
water. Discard the aqueous phases.
10.14 Transfer the hexane extract into a 125-mL Erlenmeyer flask
containing 1 to 2 g of anhydrous sodium sulfate. Swirl the flask for 30
s and decant the hexane extract into the reassembled K-D apparatus.
Complete the quantitative transfer with two 10-mL hexane rinses of the
Erlenmeyer flask.
10.15 Replace the one or two clean boiling chips and concentrate the
extract to 6 to 10 mL as in Section 10.8.
10.16 Add a clean boiling chip to the concentrator tube and attach a
two-ball micro-Snyder column. Prewet the column by adding about 1 mL of
hexane to the top. Place the micro-K-D apparatus on the water bath so
that the concentrator tube is partially immersed in the hot water.
Adjust the vertical position of the apparatus and the water temperature
as required to complete the concentration in 5 to 10 min. At the proper
rate of distillation the balls of the column will actively chatter but
the chambers will not flood. When the apparent volume of liquid reaches
about 0.5 mL, remove the K-D apparatus and allow it to drain and cool
for at least 10 min. Remove the micro-Snyder column and rinse its lower
joint into the concentrator tube with 0.2 mL of hexane.
Adjust the extract volume to 1.0 mL with hexane. Stopper the
concentrator tube and store refrigerated and protected from light if
further processing will not be performed immediately. If the extract
will be stored
[[Page 217]]
longer than two days, it should be transferred to a Teflon-sealed screw-
cap vial. If the sample extract requires no further cleanup, proceed
with GC/MS analysis (Section 12). If the sample requires further
cleanup, proceed to Section 11.
10.17 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Cleanup and Separation
11.1 Cleanup procedures may not be necessary for a relatively clean
sample matrix. If particular circumstances demand the use of a cleanup
procedure, the analyst may use either procedure below or any other
appropriate procedure. \1,5-7\ However, the analyst first must
demonstrate that the requirements of Section 8.2 can be met using the
method as revised to incorporate the cleanup procedure. Two cleanup
column options are offered to the analyst in this section. The alumina
column should be used first to overcome interferences. If background
problems are still encountered, the silica gel column may be helpful.
11.2 Alumina column cleanup for 2,3,7,8-TCDD:
11.2.1 Fill a 300 mm long x 10 mm ID chromatographic column with
activated alumina to the 150 mm level. Tap the column gently to settle
the alumina and add 10 mm of anhydrous sodium sulfate to the top.
11.2.2 Preelute the column with 50 mL of hexane. Adjust the elution
rate to 1 mL/min. Discard the eluate and just prior to exposure of the
sodium sulfate layer to the air, quantitatively transfer the 1.0-mL
sample extract onto the column using two 2-mL portions of hexane to
complete the transfer.
11.2.3 Just prior to exposure of the sodium sulfate layer to the
air, add 50 mL of 3% methylene chloride/95% hexane (V/V) and continue
the elution of the column. Discard the eluate.
11.2.4 Next, elute the column with 50 mL of 20% methylene chloride/
80% hexane (V/V) into a 500-mL K-D flask equipped with a 10-mL
concentrator tube. Concentrate the collected fraction to 1.0 mL as in
Section 10.16 and analyze by GC/MS (Section 12).
11.3 Silica gel column cleanup for 2,3,7,8-TCDD:
11.3.1 Fill a 400 mm long x 11 mm ID chromatmgraphic column with
silica gel to the 300 mm level. Tap the column gently to settle the
silica gel and add 10 mm of anhydrous sodium sulfate to the top.
11.3.2 Preelute the column with 50 mL of 20% benzene/80% hexane (V/
V). Adjust the elution rate to 1 mL/min. Discard the eluate and just
prior to exposure of the sodium sulfate layer to the air, quantitatively
transfer the 1.0-mL sample extract onto the column using two 2-mL
portions of 20% benzene/80% hexane to complete the transfer.
11.3.3 Just prior to exposure of the sodium sulfate layer to the
air, add 40 mL of 20% benzene/80% hexane to the column. Collect the
eluate in a clean 500-mL K-D flask equipped with a 10-mL concentrator
tube. Concentrate the collected fraction to 1.0 mL as in Section 10.16
and analyze by GC/MS.
12. GC/MS Analysis
12.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. Other capillary columns or
chromatographic conditions may be used if the requirements of Sections
5.5.2 and 8.2 are met.
12.2 Analyze standards and samples with the mass spectrometer
operating in the selected ion monitoring (SIM) mode using a dwell time
to give at least seven points per peak. For LRMS, use masses at m/z 320,
322, and 257 for 2,3,7,8-TCDD and either m/z 328 for \37\Cl4
2,3,7,8-TCDD or m/z 332 for \13\C12 2,3,7,8-TCDD. For HRMS,
use masses at m/z 319.8965 and 321.8936 for 2,3,7,8-TCDD and either m/z
327.8847 for \37\Cl4 2,3,7,8-TCDD or m/z 331.9367 for
\13\C12 2,3,7,8-TCDD.
12.3 If lower detection limits are required, the extract may be
carefully evaporated to dryness under a gentle stream of nitrogen with
the concentrator tube in a water bath at about 40 [deg]C. Conduct this
operation immediately before GC/MS analysis. Redissolve the extract in
the desired final volume of ortho-xylene or tetradecane.
12.4 Calibrate the system daily as described in Section 7.
12.5 Inject 2 to 5 [micro]L of the sample extract into the gas
chromatograph. The volume of calibration standard injected must be
measured, or be the same as all sample injection volumes.
12.6 The presence of 2,3,7,8-TCDD is qualitatively confirmed if all
of the following criteria are achieved:
12.6.1 The gas chromatographic column must resolve 2,3,7,8-TCDD from
the other 21 TCDD isomers.
12.6.2 The masses for native 2,3,7,8-TCDD (LRMS-m/z 320, 322, and
257 and HRMS-m/z 320 and 322) and labeled 2,3,7,8-TCDD (m/z 328 or 332)
must exhibit a simultaneous maximum at a retention time that matches
that of native 2,3,7,8-TCDD in the calibration standard, with the
performance specifications of the analytical system.
12.6.3 The chlorine isotope ratio at m/z 320 and m/z 322 must agree
to within10% of that in the calibration standard.
12.6.4 The signal of all peaks must be greater than 2.5 times the
noise level.
12.7 For quantitation, measure the response of the m/z 320 peak for
2,3,7,8-TCDD
[[Page 218]]
and the m/z 332 peak for \13\C12 2,3,7,8-TCDD or the m/z 328
peak for \37\Cl4 2,3,7,8-TCDD.
12.8 Co-eluting impurities are suspected if all criteria are
achieved except those in Section 12.6.3. In this case, another SIM
analysis using masses at m/z 257, 259, 320 and either m/a 328 or m/z 322
can be performed. The masses at m/z 257 and m/z 259 are indicative of
the loss of one chlorine and one carbonyl group from 2,3,7,8-TCDD. If
masses m/z 257 and m/z 259 give a chlorine isotope ratio that agrees to
within 10% of the same cluster in the calibration
standards, then the presence of TCDD can be confirmed. Co-eluting DDD,
DDE, and PCB residues can be confirmed, but will require another
injection using the appropriate SIM masses or full repetitive mass
scans. If the response for \37\Cl4 2,3,7,8-TCDD at m/z 328 is
too large, PCB contamination is suspected and can be confirmed by
examining the response at both m/z 326 and m/z 328. The
\37\Cl4 2,3,7,8-TCDD internal standard gives negligible
response at m/z 326. These pesticide residues can be removed using the
alumina column cleanup procedure.
12.9 If broad background interference restricts the sensitivity of
the GC/MS analysis, the analyst should employ additional cleanup
procedures and reanalyze by GC/MS.
12.10 In those circumstances where these procedures do not yield a
definitive conclusion, the use of high resolution mass spectrometry is
suggested. \5\
13. Calculations
13.1 Calculate the concentration of 2,3,7,8-TCDD in the sample using
the response factor (RF) determined in Section 7.1.2 and Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.123
Equation 2
where:
As=SIM response for 2,3,7,8-TCDD at m/z 320.
Ais=SIM response for the internal standard at m/z 328 or 332.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
13.2 For each sample, calculate the percent recovery of the internal
standard by comparing the area of the m/z peak measured in the sample to
the area of the same peak in the calibration standard. If the recovery
is below 50%, the analyst should review all aspects of his analytical
technique.
13.3 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentration
listed in Table 1 was obtained using reagent water. \14\ The MDL
actually achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method was tested by 11 laboratories using reagent water,
drinking water, surface water, and three industrial wastewaters spiked
at six concentrations over the range 0.02 to 0.20 [micro]g/L. \15\
Single operator precision, overall precision, and method accuracy were
found to be directly related to the concentration of the parameter and
essentially independent of the sample matrix. Linear equations to
describe these relationships are presented in Table 3.
References
1. 40 CFR part 136, appendix B.
2. ``Determination of TCDD in Industrial and Municipal
Wastewaters,'' EPA 600/4-82-028, National Technical Information Service,
PB82-196882, Springfield, Virginia 22161, April 1982.
3. Buser, H.R., and Rappe, C. ``High Resolution Gas Chromatography
of the 22 Tetrachlorodibenzo-p-dioxin Isomers,'' Analytical Chemistry,
52, 2257 (1980).
4. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
5. Harless, R. L., Oswald, E. O., and Wilkinson, M. K. ``Sample
Preparation and Gas Chromatography/Mass Spectrometry Determination of
2,3,7,8-Tetrachlorodibenzo-p-dioxin,'' Analytical Chemistry, 52, 1239
(1980).
6. Lamparski, L. L., and Nestrick, T. J. ``Determination of Tetra-,
Hepta-, and Octachlorodibenzo-p-dioxin Isomers in Particulate Samples at
Parts per Trillion Levels,'' Analytical Chemistry, 52, 2045 (1980).
7. Longhorst, M. L., and Shadoff, L. A. ``Determination of Parts-
per-Trillion Concentrations of Tetra-, Hexa-, and Octachlorodibenzo-p-
dioxins in Human Milk,'' Analytical Chemistry, 52, 2037 (1980).
8. ``Carcinogens--Working with Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
9. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occuptional Safety and Health Administration, OSHA 2206
(Revised, January 1976).
[[Page 219]]
10. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
11. Provost, L. P., and Elder, R. S., ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
12. ASTM Annual Book of Standards, Part 31, D3370-76, ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
13. ``Methods, 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
14. Wong, A.S. et al. ``The Determination of 2,3,7,8-TCDD in
Industrial and Municipal Wastewaters, Method 613, Part 1--Development
and Detection Limits,'' G. Choudhay, L. Keith, and C. Ruppe, ed.,
Butterworth Inc., (1983).
15. ``EPA Method Study 26, Method 613: 2,3,7,8-Tetrachlorodibenzo-p-
dioxin,'' EPA 600/4-84-037, National Technical Information Service,
PB84-188879, Springfield, Virginia 22161, May 1984.
Table 1--Chromatographic Conditions and Method Detection Limit
------------------------------------------------------------------------
Method
Retention detection
Parameter time limit
(min) ([micro]g/
L)
------------------------------------------------------------------------
2,3,7,8-TCDD..................................... 13.1 0.002
------------------------------------------------------------------------
Column conditions: SP-2330 coated on a 60 m long x 0.25 mm ID glass
column with hydrogen carrier gas at 40 cm/sec linear velocity,
splitless injection using tetradecane. Column temperature held
isothermal at 200[deg]C for 1 min, then programmed at 8[deg]C/min to
250 [deg]C and held. Use of helium carrier gas will approximately
double the retention time.
Table 2--QC Acceptance Criteria--Method 613
----------------------------------------------------------------------------------------------------------------
Limit for
Test conc. s Range for X Range
Parameter ([micro]g/ ([micro]g/ ([micro]g/L) for P,
L) L) Ps (%)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD................................................... 0.100 0.0276 0.0523-0.1226 45-129
----------------------------------------------------------------------------------------------------------------
s=Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
Note: These criteria are based directly upon the method performance data in Table 3. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 3.
Table 3--Method Accuracy and Precision as Functions of Concentration--Method 613
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst,
Parameter recovery, X ' precision, sr ' Overall precision,
([micro]g/L) ([micro]/L) S ' ([micro]/g/L)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD........................................ 0.86C+0.00145 0.13X+0.00129 0.19X+0.00028
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements. of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
Method 624--Purgeables
1. Scope and Application
1.1 This method covers the determination of a number of purgeable
organics. The following parameters may be determined by this method:
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Benzene.......................................... 34030 71-43-2
Bromodichloromethane............................. 32101 75-27-4
Bromoform........................................ 32104 75-25-2
Bromomethane..................................... 34413 74-83-9
Carbon tetrachloride............................. 32102 56-23-5
Chlorobenzene.................................... 34301 108-90-7
Chloroethane..................................... 34311 75-00-3
2-Chloroethylvinyl ether......................... 34576 110-75-8
Chloroform....................................... 32106 67-66-3
Chloromethane.................................... 34418 74-87-3
Dibromochloromethane............................. 32105 124-48-1
1,2-Dichlorobenzene.............................. 34536 95-50-1
1,3-Dichlorobenzene.............................. 34566 541-73-1
1,4-Dichlorobenzene.............................. 34571 106-46-7
1,1-Dichloroethane............................... 34496 75-34-3
1,2-Dichloroethane............................... 34531 107-06-2
1,1-Dichloroethane............................... 34501 75-35-4
trans-1,2-Dichloroethene......................... 34546 156-60-5
1,2-Dichloropropane.............................. 34541 78-87-5
cis-1,3-Dichloropropene.......................... 34704 10061-01-5
trans-1,3-Dichloropropene........................ 34699 10061-02-6
Ethyl benzene.................................... 34371 100-41-4
Methylene chloride............................... 34423 75-09-2
1,1,2,2-Tetrachloroethane........................ 34516 79-34-5
Tetrachloroethene................................ 34475 127-18-4
Toluene.......................................... 34010 108-88-3
1,1,1-Trichloroethene............................ 34506 71-55-6
1,1,2-Trichloroethene............................ 34511 79-00-5
Trichloroethane.................................. 39180 79-01-6
Trichlorofluoromethane........................... 34488 75-69-4
Vinyl chloride................................... 39175 75-01-4
------------------------------------------------------------------------
[[Page 220]]
1.2 The method may be extended to screen samples for acrolein
(STORET No. 34210, CAS No. 107-02-8) and acrylonitrile (STORET No.
34215, CAS No. 107-13-1), however, the preferred method for these two
compounds in Method 603.
1.3 This is a purge and trap gas chromatographic/mass spectrometer
(GC/MS) method applicable to the determination of the compounds listed
above in municipal and industrial discharges as provided under 40 CFR
136.1.
1.4 The method detection limit (MDL, defined in Section 14.1) \1\
for each parameter is listed in Table 1. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.5 Any modification to this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5. Depending upon the nature of the modification and the extent
of intended use, the applicant may be required to demonstrate that the
modifications will produce equivalent results when applied to relevant
wastewaters.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the operation of a purge and trap system and a
gas chromatograph/mass spectrometer and in the interpretation of mass
spectra. Each analyst must demonstrate the ability to generate
acceptable results with this method using the procedure described in
Section 8.2.
2. Summary of Method
2.1 An inert gas is bubbled through a 5-mL water sample contained in
a specially-designed purging chamber at ambient temperature. The
purgeables are efficiently transferred from the aqueous phase to the
vapor phase. The vapor is swept through a sorbent trap where the
purgeables are trapped. After purging is completed, the trap is heated
and backflushed with the inert gas to desorb the purgeables onto a gas
chromatographic column. The gas chromatograph is temperature programmed
to separate the purgeables which are then detected with a mass
spectrometer. \2,3\
3. Interferences
3.1 Impurities in the purge gas, organic compounds outgassing from
the plumbing ahead of the trap, and solvent vapors in the laboratory
account for the majority of contamination problems. The analytical
system must be demonstated to be free from contamination under the
conditions of the analysis by running laboratory reagent blanks as
described in Section 8.1.3. The use of non-Teflon plastic tubing, non-
Teflon thread sealants, or flow controllers with rubber components in
the purge and trap system should be avoided.
3.2 Samples can be contaminated by diffusion of volatile organics
(particularly fluorocarbons and methylene chloride) through the septum
seal into the sample during shipment and storage. A field reagent blank
prepared from reagent water and carried through the sampling and
handling protocol can serve as a check on such contamination.
3.3 Contamination by carry-over can occur whenever high level and
low level samples are sequentially analyzed. To reduce carry-over, the
purging device and sample syringe must be rinsed with reagent water
between sample analyses. Whenever an unusually concentrated sample is
encountered, it should be followed by an analysis of reagent water to
check for cross contamination. For samples containing large amounts of
water-soluble materials, suspended solids, high boiling compounds or
high pureeable levels, it may be necessary to wash the purging device
with a detergent solution, rinse it with distilled water, and then dry
it in a 105 [deg]C oven between analyses. The trap and other parts of
the system are also subject to contamination; therefore, frequent
bakeout and purging of the entire system may be required.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this methmd. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
4-6 for the information of the analyst.
4.2. The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: benzene, carbon tetrachloride, chloroform, 1,4-
dichlorobenzene, and vinyl chloride. Primary standards of these toxic
compounds should be prepared in a hood. A NIOSH/MESA approved toxic gas
respirator should be worn when the analyst handles high concentrations
of these toxic compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete sampling.
[[Page 221]]
5.1.1 Vial--25-mL capacity or larger, equipped with a screw cap with
a hole in the center (Pierce 13075 or equivalent). Detergent
wash, rinse with tap and distilled water, and dry at 105 [deg]C before
use.
5.1.2 Septum--Teflon-faced silicane (Pierce 12722 or
equivalent). Detergent wash, rinse with tap and distilled water, and dry
at 105 [deg]C for 1 h before use.
5.2 Purge and trap system--The purge and trap system consists of
three separate pieces of equipment: A purging device, trap, and
desorber. Several complete systems are now commercially available.
5.2.1 The purging device must be designed to accept 5-mL samples
with a water column at least 3 cm deep. The gaseous head space between
the water column and the trap must have a total volume of less than 15
mL. The purge gas must pass though the water column as finely divided
bubbles with a diameter of less than 3 mm at the origin. The purge gas
must be introduced no more than 5 mm from the base of the water column.
The purging device illustrated in Figure 1 meets these design criteria.
5.2.2 The trap must be at least 25 cm long and have an inside
diameter of at least 0.105 in. The trap must be packed to contain the
following minimum lengths of adsorbents: 1.0 cm of methyl silicone
coated packing (Section 6.3.2), 15 cm of 2,6-dyphenylene oxide polymer
(Section 6.3.1), and 8 cm of silica gel (Section 6.3.3). The minimum
specifications for the trap are illustrated in Figure 2.
5.2.3 The desorber should be capable of rapidly heating the trap to
180 [deg]C. The polymer section of the trap should not be heated higher
than 180 [deg]C and the remaining sections should not exceed 200 [deg]C.
The desorber illustrated in Figure 2 meets these design criteria.
5.2.4 The purge and trap system may be assembled as a separate unit
or be coupled to a gas chromatograph as illustrated in Figures 3 and 4.
5.3 GC/MS system:
5.3.1 Gas chromatograph--An analytical system complete with a
temperature programmable gas chromatograph suitable for on-column
injection and all required accessories including syringes, analytical
columns, and gases.
5.3.2 Column--6 ft long x 0.1 in ID stainless steel or glass, packed
with 1% SP-1000 on Carbopack B (60/80 mesh) or equivalent. This column
was used to develop the method performance statements in Section 14.
Guidelines for the use of alternate column packings are provided in
Section 11.1.
5.3.3 Mass spectrometer--Capable of scanning from 20 to 260 amu
every 7 s or less, utilizing 70 V (nominal) electron energy in the
electron impact ionization mode, and producing a mass spectrum which
meets all the criteria in Table 2 when 50 ng of 4-bromofluorobenzene
(BFB) is injected through the GC inlet.
5.3.4 GC/MS interface--Any GC to MS interface that gives acceptable
calibration points at 50 ng or less per injection for each of the
parameters of interest and achieves all acceptable performance criteria
(Section 10) may be used. GC to MS interfaces constructed of all glass
or glass-lined materials are recommended. Glass can be deactivated by
silanizing with dichlorodimethylsilane.
5.3.5 Data system--A computer system must be interfaced to the mass
spectrometer that allows the continuous acquisition and storage on
machine-readable media of all mass spectra obtained throughout the
duration of the chromatographic program. The computer must have software
that allows searching any GC/MS data file for specific m/z (masses) and
plotting such m/z abundances versus time or scan number. This type of
plot is defined as an Extracted Ion Current Profile (EICP). Software
must also be available that allows integrating the abundance in any EICP
between specified time or scan number limits.
5.4 Syringes--5-mL, glass hypodermic with Luerlok tip (two each), if
applicable to the purging device.
5.5 Micro syringes--25-[micro]L, 0.006 in. ID needle.
5.6 Syringe valve--2-way, with Luer ends (three each).
5.7 Syringe--5-mL, gas-tight with shut-off valve.
5.8 Bottle--15-mL, screw-cap, with Teflon cap liner.
5.9 Balance--Analytical, capable of accurately weighing 0.0001 g.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.1.1 Reagent water can be generated by passing tap water through a
carbon filter bed containing about 1 lb of activated carbon (Filtrasorb-
300, Calgon Corp., or equivalent).
6.1.2 A water purification system (Millipore Super-Q or equivalent)
may be used to generate reagent water.
6.1.3 Reagent water may also be prepared by boiling water for 15
min. Subsequently, while maintaining the temperature at 90 [deg]C,
bubble a contaminant-free inert gas through the water for 1 h. While
still hot, transfer the water to a narrow mouth screw-cap bottle and
seal with a Teflon-lined septum and cap.
6.2 Sodium thiosulfate--(ACS) Granular.
6.3 Trap materials:
6.3.1 2,6-Diphenylene oxide polymer--Tenax, (60/80 mesh),
chromatographic grade or equivalent.
6.3.2 Methyl silicone packing--3% OV-1 on Chromosorb-W (60/80 mesh)
or equivalent.
[[Page 222]]
6.3.3 Silica gel--35/60 mesh, Davison, grade-15 or equivalent.
6.4 Methanol--Pesticide quality or equivalent.
6.5 Stock standard solutions--Stock standard solutions may be
prepared from pure standard materials or purchased as certified
solutions. Prepare stock standard solutions in methanol using assayed
liquids or gases as appropriate. Because of the toxicity of some of the
compounds, primary dilutions of these materials should be prepared in a
hood. A NIOSH/MESA approved toxic gas respirator should be used when the
analyst handles high concentrations of such materials.
6.5.1 Place about 9.8 mL of methanol into a 10-mL ground glass
stoppered volumetric flask. Allow the flask to stand, unstoppered, for
about 10 min or until all alcohol wetted surfaces have dried. Weigh the
flask to the nearest 0.1 mg.
6.5.2 Add the assayed reference material:
6.5.2.1 Liquids--Using a 100-[micro]L syringe, immediately add two
or more drops of assayed reference material to the flask, then reweigh.
Be sure that the drops fall directly into the alcohol without contacting
the neck of the flask.
6.5.2.2 Gases--To prepare standards for any of the four halocarbons
that boil below 30 [deg]C (bromomethane, chloroethane, chloromethane,
and vinyl chloride), fill a 5-mL valved gas-tight syringe with the
reference standard to the 5.0-mL mark. Lower the needle to 5 mm above
the methanol meniscus. Slowly introduce the reference standard above the
surface of the liquid (the heavy gas will rapidly dissolve in the
methanol).
6.5.3 Reweigh, dilute to volume, stopper, then mix by inverting the
flask several times. Calculate the concentration in [micro]g/[micro]L
from the net gain in weight. When compound purity is assayed to be 96%
or greater, the weight may be used without correction to calculate the
concentration of the stock standard. Commercially prepared stock
standards may be used at any concentration if they are certified by the
manufacturer or by an independent source.
6.5.4 Transfer the stock standard solution into a Teflon-sealed
screw-cap bottle. Store, with minimal headspace, at -10 to -20 [deg]C
and protect from light.
6.5.5 Prepare fresh standards weekly for the four gases and 2-
chloroethylvinyl ether. All other standards must be replaced after one
month, or sooner if comparison with check standards indicates a problem.
6.6 Secondary dilution standards--Using stock solutions, prepare
secondary dilution standards in methanol that contain the compounds of
interest, either singly or mixed together. The secondary dilution
standards should be prepared at concentrations such that the aqueous
calibration standards prepared in Section 7.3 will bracket the working
range of the analytical system. Secondary dilution standards should be
stored with minimal headspace and should be checked frequently for signs
of degradation or evaporation, especially just prior to preparing
calibration standards from them.
6.7 Surrogate standard spiking solution--Select a minimum of three
surrogate compounds from Table 3. Prepare stock standard solutions for
each surrogate standard in methanol as described in Section 6.5. Prepare
a surrogate standard spiking solution from these stock standards at a
concentration of 15 [micro]g/mL in water. Store the solutions at 4
[deg]C in Teflon-sealed glass containers with a minimum of headspace.
The solutions should be checked frequently for stability. The addition
of 10 [micro]L of this solution of 5 mL of sample or standard is
equivalent to a concentration of 30 [micro]g/L of each surrogate
standard.
6.8 BFB Standard--Prepare a 25 [micro]g/mL solution of BFB in
methanol.
6.9 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Assemble a purge and trap system that meets the specifications
in Section 5.2. Condition the trap overnight at 180 [deg]C by
backflushing with an inert gas flow of at least 20 mL/min. Condition the
trap for 10 min once daily prior to use.
7.2 Connect the purge and trap system to a gas chromatograph. The
gas chromatograph must be operated using temperature and flow rate
conditions equivalent to those given in Table 1.
7.3 Internal standard calibration procedure--To use this approach,
the analyst must select three or more internal standards that are
similar in analytical behavior to the compounds of interest. The analyst
must further demonstrate that the measurement of the internal standard
is not affected by method or matrix interferences. Some recommended
internal standards are listed in Table 3.
7.3.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter by carefully adding 20.0
[micro]L of one or more secondary dilution standards to 50, 250, or 500
mL of reagent water. A 25-[micro]L syringe with a 0.006 in. ID needle
should be used for this operation. One of the calibration standards
should be at a concentration near, but above, the MDL (Table 1) and the
other concentrations should correspond to the expected range of
concentrations found in real samples or should define the working range
of the GC/MS system. These aqueous standards can be stored up to 24 h,
if held in sealed vials with zero headspace as described in Section 9.2.
If not so stored, they must be discarded after 1 h.
7.3.2 Prepare a spiking solution containing each of the internal
standards using the procedures described in Sections 6.5 and
[[Page 223]]
6.6. It is recommended that the secondary dilution standard be prepared
at a concentration of 15 [micro]g/mL of each internal standard compound.
The addition of 10 [micro]L of this standard to 5.0 mL of sample or
calibration standard would be equivalent to 30 [micro]g/L.
7.3.3 Analyze each calibration standard according to Section 11,
adding 10 [micro]L of internal standard spiking solution directly to the
syringe (Section 11.4). Tabulate the area response of the characteristic
m/z against concentration for each compound and internal standard, and
calculate response factors (RF) for each compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.124
Equation 1
where:
As=Area of the characteristic m/z for the parameter to be
measured.
Ais=Area of the characteristic m/z for the inernal standard.
Cis=Concentration of the internal standard.
Cs=Concentration of the parameter to be measured.
If the RF value over the working range is a constant (<35% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.4 The working calibration curve or RF must be verified on each
working day by the measurement of a QC check sample.
7.4.1 Prepare the QC check sample as described in Section 8.2.2.
7.4.2 Analyze the QC check sample according to the method beginning
in Section 10.
7.4.3 For each parameter, compare the response (Q) with the
corresponding calibration acceptance criteria found in Table 5. If the
responses for all parameters of interest fall within the designated
ranges, analysis of actual samples can begin. If any individual Q falls
outside the range, proceed according to Section 7.4.4.
Note: The large number of parameters in Table 5 present a
substantial probability that one or more will not meet the calibration
acceptance criteria when all parameters are analyzed.
7.4.4 Repeat the test only for those parameters that failed to meet
the calibration acceptance criteria. If the response for a parameter
does not fall within the range in this second test, a new calibration
curve or RF must be prepared for that parameter according to Section
7.3.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occurring in
chromatography, the analyst is permitted certain options (detailed in
Section 11.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Each day, the analyst must analyze a reagent water blank to
demonstrate that interferences from the analytical system are under
control.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 5% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 5% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must spike all samples with surrogate standards
to monitor continuing laboratory performance. This procedure is
described in Section 8.5.
8.1.7 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.6.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 10 [micro]g/
mL in methanol. The QC check sample concentrate must be obtained from
the U.S. Environmental Protection Agency, Environmental Monitoring and
Support Laboratory in Cincinnati, Ohio, if available. If not available
from that source, the QC check sample
[[Page 224]]
concentrate must be obtained from another external source. If not
available from either source above, the QC check sample concentrate must
be prepared by the laboratory using stock standards prepared
independently from those used for calibration.
8.2.2 Prepare a QC check sample to contain 20 [micro]g/L of each
parameter by adding 200 [micro]L of QC check sample concentrate to 100
mL of reagent water.
8.2.3 Analyze four 5-mL aliquots of the well-mixed QC check sample
according to the method beginning in Section 10.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
of interest using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 5. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 5 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.3.
8.2.6.2 Beginning with Section 8.2.3, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.3.
8.3 The laboratory must, on an ongoing basis, spike at least 5% of
the samples from each sample site being monitored to assess accuracy.
For laboratories analyzing 1 to 20 samples per month, at least one
spiked sample per month is required.
8.3.1 The concentration of the spike in the sample should be
determined as follows:
8.3.1.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 20 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.2 Analyze one 5-mL sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second 5-mL sample aliquot with 10
[micro]L of the QC check sample concentrate and analyze it to determine
the concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 5. These acceptance
criteria wer calculated to include an allowance for error in measurement
of both the background and spike concentrations, assuming a spike to
background ratio of 5:1. This error will be accounted for to the extent
that the analyst's spike to background ratio approaches 5:1. \7\ If
spiking was performed at a concentration lower than 20 [micro]g/L, the
analyst must use either the QC acceptance criteria in Table 5, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recoveryof a parameter: (1) Calculate accuracy (X') using the equation
in Table 6, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 6,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T) (2.44(100 S'/T)%. \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required anlaysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory. If the entire list of parameters in Table 5 must be measured
in the sample in Section 8.3, the probability that the analysis of a QC
check standard will be required is high. In this case the QC check
standard should be routinely analyzed with the spiked sample.
8.4.1 Prepare the QC check standard by adding 10 [micro]L of QC
check sample concentrate (Section 8.2.1 or 8.3.2) to 5 mL of reagent
water. The QC check standard needs only to
[[Page 225]]
contain the parameters that failed criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(PS) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (PS) for each
parameter with the corresponding QC acceptance criteria found in Table
5. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As a quality control check, the laboratory must spike all
samples with the surrogate standard spiking solutions as described in
Section 11.4, and calculate the percent recovery of each surrogate
compound.
8.6 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent recovery interval from P--2sp to P +
2sp. If P=90% and sp=10%, for example, the
accuracy interval is expressed as 70-110%. Update the accuracy
assessment for each parameter a regular basis (e.g. after each five to
ten new accuracy measurements).
8.7 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of the samples. Field duplicates may be analyzed to assess the
precision of the environmental measurements. Whenever possible, the
laboratory should analyze standard reference materials and participate
in relevant performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 All samples must be iced or refrigerated from the time of
collection until analysis. If the sample contains residual chlorine, add
sodium thiosulfate preservative (10 mg/40 mL is sufficient for up to 5
ppm Cl2) to the empty sample bottle just prior to shipping to
the sampling site. EPA Methods 330.4 and 330.5 may be used for
measurement of residual chlorine. \8\ Field test kits are available for
this purpose.
9.2 Grab samples must be collected in glass containers having a
total volume of at least 25 mL. Fill the sample bottle just to
overflowing in such a manner that no air bubbles pass through the sample
as the bottle is being filled. Seal the bottle so that no air bubbles
are entrapped in it. If preservative has been added, shake vigorously
for 1 min. Maintain the hermetic seal on the sample bottle until time of
analysis.
9.3 Experimental evidence indicates that some aromatic compounds,
notably benzene, toluene, and ethyl benzene are susceptible to rapid
biological degradation under certain environmental conditions. \3\
Refrigeration alone may not be adequate to preserve these compounds in
wastewaters for more than seven days. For this reason, a separate sample
should be collected, acidified, and analyzed when these aromatics are to
be determined. Collect about 500 mL of sample in a clean container.
Adjust the pH of the sample to about 2 by adding 1+1 HCl while stirring
vigorously, Check pH with narrow range (1.4 to 2.8) pH paper. Fill a
sample container as described in Section 9.2.
9.4 All samples must be analyzed within 14 days of collection. \3\
10. Daily GC/MS Performance Tests
10.1 At the beginning of each day that analyses are to be performed,
the GC/MS system must be checked to see if acceptable performance
criteria are achieved for BFB. \9\ The performance test must be passed
before any samples, blanks, or standards are analyzed, unless the
instrument has met the DFTPP test described in Method 625 earlier in the
day. \10\
10.2 These performance tests require the following instrumental
parameters:
Electron Energy: 70 V (nominal)
Mass Range: 20 to 260 amu
Scan Time: To give at least 5 scans per peak but not to exceed 7 s
per scan.
10.3 At the beginning of each day, inject 2 [micro]L of BFB solution
directly on the column. Alternatively, add 2 [micro]L of BFB solution to
5.0 mL of reagent water or standard solution and analyze the solution
according to section 11. Obtain a background-corrected mass spectrum of
BFB and confirm that all the key m/z criteria in Table 2 are achieved.
If all the criteria are not achieved, the analyst must retune the mass
spectrometer and repeat the test until all criteria are achieved.
11. Sample Purging and Gas Chromatography
11.1 Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and MDL
that can be achieved under these conditions. An example of the
separations achieved by this column is shown in Figure 5. Other packed
columns or chromatographic conditions may be used if the requirements of
Section 8.2 are met.
[[Page 226]]
11.2 After achieving the key m/z abundance criteria in Section 10,
calibrate the system daiy as described in Section 7.
11.3 Adjust the purge gas (helium) flow rate to 40 mL/min. Attach
the trap inlet to the purging device, and set the purge and trap system
to purge (Figure 3). Open the syringe valve located on the purging
device sample introduction needle.
11.4 Allow the sample to come to ambient temperature prior to
introducing it into the syringe. Remove the plunger from a 5-mL syringe
and attach a closed syringe valve. Open the sample bottle (or standard)
and carefully pour the sample into the syringe barrel to just short of
overflowing. Replace the syringe plunger and compress the sample. Open
the syringe valve and vent any residual air while adjusting the sample
volume to 5.0 mL. Since this process of taking an aliquot destroys the
validity of the sample for future analysis, the analyst should fill a
second syringe at this time to protect against possible loss of data.
Add 10.0 [micro]L of the surrogate spiking solution (Section 6.7) and
10.0 [micro]L of the internal standard spiking solution (Section 7.3.2)
through the valve bore, then close the valve. The surrogate and internal
standards may be mixed and added as a single spiking solution.
11.5 Attach the syringe-syringe valve assembly to the syringe valve
on the purging device. Open the syringe valves and inject the sample
into the purging chamber.
11.6 Close both valves and purge the sample for 11.0 0.1 min at ambient temperature.
11.7 After the 11-min purge time, attach the trap to the
chromatograph, adjust the purge and trap system to the desorb mode
(Figure 4), and begin to temperature program the gas chromatograph.
Introduce the trapped materials to the GC column by rapidly heating the
trap to 180 [deg]C while backflushing the trap with an inert gas between
20 and 60 mL/min for 4 min. If rapid heating of the trap cannot be
achieved, the GC cloumn must be used as a secondary trap by cooling it
to 30 [deg]C (subambient temperature, if problems persist) instead of
the initial program temperature of 45 [deg]C.
11.8 While the trap is being desorbed into the gas chromatograph,
empty the purging chamber using the sample introduction syringe. Wash
the chamber with two 5-mL flushes of reagent water.
11.9 After desorbing the sample for 4 min, recondition the trap by
returning the purge and trap system to the purge mode. Wait 15 s then
close the syringe valve on the purging device to begin gas flow through
the trap. The trap temperature should be maintained at 180 [deg]C. After
approximately 7 min, turn off the trap heater and open the syringe valve
to stop the gas flow through the trap. When the trap is cool, the next
sample can be analyzed.
11.10 If the response for any m/z exceeds the working range of the
system, prepare a dilution of the sample with reagent water from the
aliquot in the second syringe and reanalyze.
12. Qualitative Identification
12.1 Obtain EICPs for the primary m/z (Table 4) and at least two
secondary masses for each parameter of interest. The following criteria
must be met to make a qualitative identification:
12.1.1 The characteristic masses of each parameter of interest must
maximize in the same or within one scan of each other.
12.1.2 The retention time must fall within 30
s of the retention time of the authentic compound.
12.1.3 The relative peak heights of the three characteristic masses
in the EICPs must fall within 20% of the relative
intensities of these masses in a reference mass spectrum. The reference
mass spectrum can be obtained from a standard analyzed in the GC/MS
system or from a reference library.
12.2 Structural isomers that have very similar mass spectra and less
than 30 s difference in retention time, can be explicitly identified
only if the resolution between authentic isomers in a standard mix is
acceptable. Acceptable resolution is achieved if the baseline to valley
height between the isomers is less than 25% of the sum of the two peak
heights. Otherwise, structural isomers are identified as isomeric pairs.
13. Calculations
13.1 When a parameter has been identified, the quantitation of that
parameter should be based on the integrated abundance from the EICP of
the primary characteristic m/z given in Table 4. If the sample produces
an interference for the primary m/z, use a secondary characteristic m/z
to quantitate.
Calculate the concentration in the sample using the response factor
(RF) determined in Section 7.3.3 and Equation 2.
[GRAPHIC] [TIFF OMITTED] TC15NO91.125
Equation 2
where:
AS=Area of the characteristic m/z for the parameter or
surrogate standard to be measured.
Ais=Area of the characteristic m/z for the internal standard.
Cis=Concentration of the internal standard.
13.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
[[Page 227]]
14. Method Performance
14.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Table 1 were obtained using reagent water. \11\ Similar
results were achieved using representative wastewaters. The MDL actually
achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
14.2 This method was tested by 15 laboratories using reagent water,
drinking water, surface water, and industrial wastewaters spiked at six
concentrations over the range 5-600 [micro]g/L. \12\ Single operator
precision, overall precision, and method accuracy were found to be
directly related to the concentration of the parameter and essentially
independent of the sample matrix. Linear equations to describe these
relationships are presented in Table 5.
References
1. 40 CFR part 136, appendix B.
2. Bellar, T.A., and Lichtenberg, J.J. ``Determining Volatile
Organics at Microgram-per-Litre Levels by Gas Chromatography,'' Journal
American Water Works Association, 66, 739 (1974).
3. Bellar, T.A., and Lichtenberg, J.J. ``Semi-Automated Headspace
Analysis of Drinking Waters and Industrial Waters for Purgeable Volatile
Organic Compounds, '' Measurement of Organic Pollutants in Water and
Wastewater, C.E. Van Hall, editor, American Society for Testing and
Materials, Philadelphia, PA. Special Technical Publication 686, 1978.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.2.3 is two times the value 1.22
derived in this report.)
8. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
9. Budde, W.L., and Eichelberger, J.W. ``Performance Tests for the
Evaluation of Computerized Eas Chromatography/Mass Spectrometry
Equipment and Laboratories,'' EPA-600/4-80-025, U.S. Environmental
Protection Agency, Environmental Monitoring and Support Laboratory,
Cincinnati, Ohio 45268, April 1980.
10. Eichelberger, J.W., Harris, L.E., and Budde, W.L. ``Reference
Compound to Calibrate Ion Abundance Measurement in Gas Chromatography--
Mass Spectrometry Systems,'' Analytical Chemistry, 47, 995-1000 (1975).
11. ``Method Detection Limit for Methods 624 and 625,'' Olynyk, P.,
Budde, W.L., and Eichelberger, J.W. Unpublished report, May 14, 1980.
12. ``EPA Method Study 29 EPA Method 624--Purgeables,'' EPA 600/4-
84-054, National Technical Information Service, PB84-209915,
Springfield, Virginia 22161, June 1984.
13.``Method Performance Data for Method 624,'' Memorandum from R.
Slater and T. Pressley, U.S. Environmental Protection Agency,
Environmental Monitoring and Support Laboratory, Cincinnati, Ohio 45268,
January 17, 1984.
Table 1--Chromatographic Conditions and Method Detection Limits
------------------------------------------------------------------------
Method
detection
Parameter Retention limit
time (min) ([micro]g/
L)
------------------------------------------------------------------------
Chloromethane................................... 2.3 nd
Bromomethane.................................... 3.1 nd
Vinyl chloride.................................. 3.8 nd
Chloroethane.................................... 4.6 nd
Methylene chloride.............................. 6.4 2.8
Trichlorofluoromethane.......................... 8.3 nd
1,1-Dichloroethene.............................. 9.0 2.8
1,1-Dichloroethane.............................. 10.1 4.7
trans-1,2-Dichloroethene........................ 10.8 1.6
Chloroform...................................... 11.4 1.6
1,2-Dichloroethane.............................. 12.1 2.8
1,1,1-Trichloroethane........................... 13.4 3.8
Carbon tetrachloride............................ 13.7 2.8
Bromodichloromethane............................ 14.3 2.2
1,2-Dichloroproane.............................. 15.7 6.0
cis-1,3-Dichloropropene......................... 15.9 5.0
Trichloroethene................................. 16.5 1.9
Benzene......................................... 17.0 4.4
Dibromochloromethane............................ 17.1 3.1
1,1,2-Trichloroethane........................... 17.2 5.0
trans-1,3-Dichloropropene....................... 17.2 nd
2-Chloroethylvinlyl ether....................... 18.6 nd
Bromoform....................................... 19.8 4.7
1,1,2,2-Tetrachloroethane....................... 22.1 6.9
Tetrachloroethene............................... 22.2 4.1
Toluene......................................... 23.5 6.0
Chlorobenzene................................... 24.6 6.0
Ethyl benzene................................... 26.4 7.2
1,3-Dichlorobenzene............................. 33.9 nd
1,2-Dichlorobenzene............................. 35.0 nd
[[Page 228]]
1,4-Dichlorobenzene............................. 35.4 nd
------------------------------------------------------------------------
Column conditions: Carbopak B (60/80 mesh) coated with 1% SP-1000 packed
in a 6 ft by 0.1 in. ID glass column with helium carrier gas at 30 mL/
min. flow rate. Column temperature held at 45[deg]C for 3 min., then
programmed at 8[deg]C/min. to 220[deg]C and held for 15 min.
nd=not determined.
Table 2--BFB Key m/z Abundance Criteria
------------------------------------------------------------------------
Mass m/z Abundance criteria
------------------------------------------------------------------------
50........................................ 15 to 40% of mass 95.
75........................................ 30 to 60% of mass 95.
95........................................ Base Peak, 100% Relative
Abundance.
96........................................ 5 to 9% of mass 95.
173....................................... <2% of mass 174.
174....................................... 50% of mass 95.
175....................................... 5 to 9% of mass 174.
176....................................... 95% but <101% of
mass 174.
177....................................... 5 to 9% of mass 176.
------------------------------------------------------------------------
Table 3--Suggested Surrogate and Internal Standards
------------------------------------------------------------------------
Retention
Compound time Primary Secondary
(min) \a\ m/z masses
------------------------------------------------------------------------
Benzene d-6............................ 17.0 84 ...........
4-Bromofluorobenzene................... 28.3 95 174, 176
1,2-Dichloroethane d-4................. 12.1 102 ...........
1,4-Difluorobenzene.................... 19.6 114 63, 88
Ethylbenzene d-5....................... 26.4 111 ...........
Ethylbenzene d-10...................... 26.4 98 ...........
Fluorobenzene.......................... 18.4 96 70
Pentafluorobenzene..................... 23.5 168 ...........
Bromochloromethane..................... 9.3 128 49, 130, 51
2-Bromo-1-chloropropane................ 19.2 77 79, 156
1, 4-Dichlorobutane.................... 25.8 55 90, 92
------------------------------------------------------------------------
\a\ For chromatographic conditions, see Table 1.
Table 4--Characteristic Masses for Purgeable Organics
------------------------------------------------------------------------
Parameter Primary Secondary
------------------------------------------------------------------------
Chloromethane........................ 50 52.
Bromomethane......................... 94 96.
Vinyl chloride....................... 62 64.
Chloroethane......................... 64 66.
Methylene chloride................... 84 49, 51, and 86.
Trichlorofluoromethane............... 101 103.
1,1-Dichloroethene................... 96 61 and 98.
1,1-Dichloroethane................... 63 65, 83, 85, 98, and 100.
trans-1,2-Dichloroethene............. 96 61 and 98.
Chloroform........................... 83 85.
1,2-Dichloroethane................... 98 62, 64, and 100.
1,1,1-Trichloroethane................ 97 99, 117, and 119.
Carbon tetrachloride................. 117 119 and 121.
Bromodichloromethane................. 127 83, 85, and 129.
1,2-Dichloropropane.................. 112 63, 65, and 114.
trans-1,3-Dichloropropene............ 75 77.
Trichloroethene...................... 130 95, 97, and 132.
Benzene.............................. 78 ........................
Dibromochloromethane................. 127 129, 208, and 206.
1,1,2-Trichloroethane................ 97 83, 85, 99, 132, and
134.
cis-1,3-Dichloropropene.............. 75 77.
2-Chloroethylvinyl ether............. 106 63 and 65.
Bromoform............................ 173 171, 175, 250, 252, 254,
and 256.
1,1,2,2-Tetrachloroethane............ 168 83, 85, 131, 133, and
166.
Tetrachloroethene.................... 164 129, 131, and 166.
Toluene.............................. 92 91.
Chlorobenzene........................ 112 114.
Ethyl benzene........................ 106 91.
1,3-Dichlorobenzene.................. 146 148 and 113.
1,2-Dichlorobenzene.................. 146 148 and 113.
1,4-Dichlorobenzene.................. 146 148 and 113.
------------------------------------------------------------------------
Table 5--Calibration and QC Acceptance Criteria--Method 624 \a\
----------------------------------------------------------------------------------------------------------------
Limit for
Range for Q s Range for X Range for P,
Parameter ([micro]/g/L) ([micro]/ ([micro]/g/L) Ps (%)
g/L)
----------------------------------------------------------------------------------------------------------------
Benzene.............................................. 12.8-27.2 6.9 15.2-26.0 37-151
Bromodichloromethane................................. 13.1-26.9 6.4 10.1-28.0 35-155
Bromoform............................................ 14.2-25.8 5.4 11.4-31.1 45-169
Bromomethane......................................... 2.8-37.2 17.9 D-41.2 D-242
Carbon tetrachloride................................. 14.6-25.4 5.2 17.2-23.5 70-140
Chlorobenzene........................................ 13.2-26.8 6.3 16.4-27.4 37-160
Chloroethane......................................... 7.6-32.4 11.4 8.4-40.4 14-230
2-Chloroethylvinyl ether............................. D-44.8 25.9 D-50.4 D-305
Chloroform........................................... 13.5-26.5 6.1 13.7-24.2 51-138
Chloromethane........................................ D-40.8 19.8 D-45.9 D-273
Dibromochloromethane................................. 13.5-26.5 6.1 13.8-26.6 53-149
1,2-Dichlorobenzene.................................. 12.6-27.4 7.1 11.8-34.7 18-190
1,3-Dichlorobenzene.................................. 14.6-25.4 5.5 17.0-28.8 59-156
1,4-Dichlorobenzene.................................. 12.6-27.4 7.1 11.8-34.7 18-190
1,1-Dichloroethane................................... 14.5-25.5 5.1 14.2-28.5 59-155
1,2-Dichloroethane................................... 13.6-26.4 6.0 14.3-27.4 49-155
1,1-Dichlorothene.................................... 10.1-29.9 9.1 3.7-42.3 D-234
trans-1,2-Dichloroethene............................. 13.9-26.1 5.7 13.6-28.5 54-156
[[Page 229]]
1,2-Dichloropropane.................................. 6.8-33.2 13.8 3.8-36.2 D-210
cis-1,3-Dichloropropene.............................. 4.8-35.2 15.8 1.0-39.0 D-227
trans-1,3-Dichloropropene............................ 10.0-30.0 10.4 7.6-32.4 17-183
Ethyl benzene........................................ 11.8-28.2 7.5 17.4-26.7 37-162
Methylene chloride................................... 12.1-27.9 7.4 D-41.0 D-221
1,1,2,2-Tetrachloroethane............................ 12.1-27.9 7.4 13.5-27.2 46-157
Tetrachloroethene.................................... 14.7-25.3 5.0 17.0-26.6 64-148
Toluene.............................................. 14.9-25.1 4.8 16.6-26.7 47-150
1,1,1-Trichloroethane................................ 15.0-25.0 4.6 13.7-30.1 52-162
1,1,2-Trichloroethane................................ 14.2-25.8 5.5 14.3-27.1 52-150
Trichloroethene...................................... 13.3-26.7 6.6 18.6-27.6 71-157
Trichlorofluoromethane............................... 9.6-30.4 10.0 8.9-31.5 17-181
Vinyl chloride....................................... 0.8-39.2 20.0 D-43.5 D-251
----------------------------------------------------------------------------------------------------------------
Q= Concentration measured in QC check sample, in [micro]g/L (Section 7.5.3).
s= Standard deviation of four recovery measurements, in [micro]g/L (Section 8.2.4).
X= Average recovery of four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps= Percent recovery measured, (Section 8.3.2, Section 8.4.2).
D= Detected; result must be greater than zero.
\a\ Criteria were calculated assuming a QC check sample concentration of 20 [micro]g/L.
Note: These criteria are based directly upon the method performance data in Table 6. Where necessary, the limits
for recovery have been broadened to assure applicability of the limits to concentrations below those used to
develop Table 6.
Table 6--Method Accuracy and Precision as Functions of Concentration--Method 624
----------------------------------------------------------------------------------------------------------------
Single analyst
Parameter Accuracy, as recovery, precision, sr' Overall precision, S'
X' ([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Benzene............................... 0.93C+2.00 0.26X-1.74 0.25X-1.33
Bromodichloromethane.................. 1.03C-1.58 0.15X+0.59 0.20X+1.13
Bromoform............................. 1.18C-2.35 0.12X+0.36 0.17X+1.38
Bromomethane \a\...................... 1.00C 0.43X 0.58X
Carbon tetrachloride.................. 1.10C-1.68 0.12X+0.25 0.11X+0.37
Chlorobenzene......................... 0.98C+2.28 0.16X-0.09 0.26X-1.92
Chloroethane.......................... 1.18C+0.81 0.14X+2.78 0.29X+1.75
2-Chloroethylvinyl ether \a\.......... 1.00C 0.62X 0.84X
Chloroform............................ 0.93C+0.33 0.16X+0.22 0.18X+0.16
Chloromethane......................... 1.03C+0.81 0.37X+2.14 0.58X+0.43
Dibromochloromethane.................. 1.01C-0.03 0.17X-0.18 0.17X+0.49
1,2-Dichlorobenzene \b\............... 0.94C+4.47 0.22X-1.45 0.30X-1.20
1,3-Dichlorobenzene................... 1.06C+1.68 0.14X-0.48 0.18X-0.82
1,4-Dichlorobenzene \b\............... 0.94C+4.47 0.22X-1.45 0.30X-1.20
1,1-Dichloroethane.................... 1.05C+0.36 0.13X-0.05 0.16X+0.47
1,2-Dichloroethane.................... 1.02C+0.45 0.17X-0.32 0.21X-0.38
1,1-Dichloroethene.................... 1.12C+0.61 0.17X+1.06 0.43X-0.22
trans-1,2,-Dichloroethene............. 1.05C+0.03 0.14X+0.09 0.19X+0.17
1,2-Dichloropropane \a\............... 1.00C 0.33X 0.45X
cis-1,3-Dichloropropene \a\........... 1.00C 0.38X 0.52X
trans-1,3-Dichloropropene \a\......... 1.00C 0.25X 0.34X
Ethyl benzene......................... 0.98C+2.48 0.14X+1.00 0.26X-1.72
Methylene chloride.................... 0.87C+1.88 0.15X+1.07 0.32X+4.00
1,1,2,2-Tetrachloroethane............. 0.93C+1.76 0.16X+0.69 0.20X+0.41
Tetrachloroethene..................... 1.06C+0.60 0.13X-0.18 0.16X-0.45
Toluene............................... 0.98C+2.03 0.15X-0.71 0.22X-1.71
1,1,1-Trichloroethane................. 1.06C+0.73 0.12X-0.15 0.21X-0.39
1,1,2-Trichloroethane................. 0.95C+1.71 0.14X+0.02 0.18X+0.00
Trichloroethene....................... 1.04C+2.27 0.13X+0.36 0.12X+0.59
Trichloroflouromethane................ 0.99C+0.39 0.33X-1.48 0.34X-0.39
Vinyl chloride........................ 1.00C 0.48X 0.65X
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
S\r\=Expected single analyst standard deviation of measurements at an average concentration found ofX, in
[micro]g/L.
S'=Expected interlaboratory standard deviation of measurements at an average concentration found ofX, in
[micro]g/L.
C=True value for the concentration, in [micro]g/L.
X=Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
\a\ Estimates based upon the performance in a single laboratory. \13\
\b\ Due to chromatographic resolution problems, performance statements for these isomers are based upon the sums
of their concentrations.
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[GRAPHIC] [TIFF OMITTED] TC02JY92.039
[[Page 232]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.040
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[GRAPHIC] [TIFF OMITTED] TC02JY92.041
Method 625--Base/Neutrals and Acids
1. Scope and Application
1.1 This method covers the determination of a number of organic
compounds that are partitioned into an organic solvent and are amenable
to gas chromatography. The parameters listed in Tables 1 and 2 may be
qualitatively and quantitatively determined using this method.
1.2 The method may be extended to include the parameters listed in
Table 3. Benzidine can be subject to oxidative losses during solvent
concentration. Under the alkaline conditions of the extraction step,
[alpha]-BHC, [gamma]-BHC, endosulfan I and II, and endrin are subject to
decomposition. Hexachlorocyclopentadiene is subject to thermal
decomposition in the inlet of the gas chromatograph, chemical reaction
in acetone solution, and photochemical decomposition. N-
nitrosodimethylamine is difficult to separate from the solvent under the
chromatographic conditions described. N-nitrosodiphenylamine decomposes
in the gas chromatographic inlet and cannot be separated from
diphenylamine. The preferred method for each of these parameters is
listed in Table 3.
1.3 This is a gas chromatographic/mass spectrometry (GC/MS) method
\2,14\ applicable to the determination of the compounds listed in Tables
1, 2, and 3 in municipal and industrial discharges as provided under 40
CFR 136.1.
[[Page 234]]
1.4 The method detection limit (MDL, defined in Section 16.1) \1\
for each parameter is listed in Tables 4 and 5. The MDL for a specific
wastewater may differ from those listed, depending upon the nature of
interferences in the sample matrix.
1.5 Any modification to this method, beyond those expressly
permitted, shall be considered as a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5. Depending upon the nature of the modification and the extent
of intended use, the applicant may be required to demonstrate that the
modifications will produce equivalent results when applied to relevant
wastewaters.
1.6 This method is restricted to use by or under the supervision of
analysts experienced in the use of a gas chromatograph/mass spectrometer
and in the interpretation of mass spectra. Each analyst must demonstrate
the ability to generate acceptable results with this method using the
procedure described in Section 8.2.
2. Summary of Method
2.1 A measured volume of sample, approximately 1-L, is serially
extracted with methylene chloride at a pH greater than 11 and again at a
pH less than 2 using a separatory funnel or a continuous extractor. \2\
The methylene chloride extract is dried, concentrated to a volume of 1
mL, and analyzed by GC/MS. Qualitative identification of the parameters
in the extract is performed using the retention time and the relative
abundance of three characteristic masses (m/z). Quantitative analysis is
performed using internal standard techniques with a single
characteristic m/z.
3. Interferences
3.1 Method interferences may be caused by contaminants in solvents,
reagents, glassware, and other sample processing hardware that lead to
discrete artifacts and/or elevated baselines in the total ion current
profiles. All of these materials must be routinely demonstrated to be
free from interferences under the conditions of the analysis by running
laboratory reagent blanks as described in Section 8.1.3.
3.1.1 Glassware must be scrupulously cleaned. \3\ Clean all
glassware as soon as possible after use by rinsing with the last solvent
used in it. Solvent rinsing should be followed by detergent washing with
hot water, and rinses with tap water and distilled water. The glassware
should then be drained dry, and heated in a muffle furnace at 400 [deg]C
for 15 to 30 min. Some thermally stable materials, such as PCBs, may not
be eliminated by this treatment. Solvent rinses with acetone and
pesticide quality hexane may be substituted for the muffle furnace
heating. Thmrough rinsing with such solvents usually eliminates PCB
interference. Volumetric ware should not be heated in a muffle furnace.
After drying and cooling, glassware should be sealed and stored in a
clean environment to prevent any accumulation of dust or other
contaminants. Store inverted or capped with aluminum foil.
3.1.2 The use of high purity reagents and solvents helps to minimize
interference problems. Purification of solvents by distillation in all-
glass systems may be required.
3.2 Matrix interferences may be caused by contaminants that are co-
extracted from the sample. The extent of matrix interferences will vary
considerably from source to source, depending upon the nature and
diversity of the industrial complex or municipality being sampled.
3.3 The base-neutral extraction may cause significantly reduced
recovery of phenol, 2-methylphenol, and 2,4-dimethylphenol. The analyst
must recognize that results obtained under these conditions are minimum
concentrations.
3.4 The packed gas chromatographic columns recommended for the basic
fraction may not exhibit sufficient resolution for certain isomeric
pairs including the following: anthracene and phenanthrene; chrysene and
benzo(a)anthracene; and benzo(b)fluoranthene and benzo(k)fluoranthene.
The gas chromatographic retention time and mass spectra for these pairs
of compounds are not sufficiently different to make an unambiguous
identification. Alternative techniques should be used to identify and
quantify these specific compounds, such as Method 610.
3.5 In samples that contain an inordinate number of interferences,
the use of chemical ionization (CI) mass spectrometry may make
identification easier. Tables 6 and 7 give characteristic CI ions for
most of the compounds covered by this method. The use of CI mass
spectrometry to support electron ionization (EI) mass spectrometry is
encouraged but not required.
4. Safety
4.1 The toxicity or carcinogenicity of each reagent used in this
method have not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is responsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified
4-6 for the information of the analyst.
[[Page 235]]
4.2 The following parameters covered by this method have been
tentatively classified as known or suspected, human or mammalian
carcinogens: benzo(a)anthracene, benzidine, 3,3'-dichlorobenzidine,
benzo(a)pyrene, [alpha]-BHC, [beta]-BHC, [delta]-BHC, [gamma]-BHC,
dibenzo(a,h)anthracene, N-nitrosodimethylamine, 4,4'-DDT, and
polychlorinated biphenyls (PCBs). Primary standards of these toxic
compounds should be prepared in a hood. A NIOSH/MESA approved toxic gas
respirator should be worn when the analyst handles high concentrations
of these toxic compounds.
5. Apparatus and Materials
5.1 Sampling equipment, for discrete or composit sampling.
5.1.1 Grab sample bottle--1-L or 1-gt, amber glass, fitted with a
screw cap lined with Teflon. Foil may be substituted for Teflon if the
sample is not corrosive. If amber bottles are not available, protect
samples from light. The bottle and cap liner must be washed, rinsed with
acetone or methylene chloride, and dried before use to minimize
contamination.
5.1.2 Automatic sampler (optional)--The sampler must incorporate
glass sample containers for the collection of a minimum of 250 mL of
sample. Sample containers must be kept refrigerated at 4 [deg]C and
protected from light during compositing. If the sampler uses a
peristaltic pump, a minimum length of compressible silicone rubber
tubing may be used. before use, however, the compressible tubing should
be throughly rinsed with methanol, followed by repeated rinsings with
distilled water to minimize the potential for contamination of the
sample. An integrating flow meter is required to collect flow
proportional composites.
5.2 Glassware (All specifications are suggested. Catalog numbers are
included for illustration only.):
5.2.1 Separatory funnel--2-L, with Teflon stopcock.
5.2.2 Drying column--Chromatographic column, 19 mm ID, with coarse
frit
5.2.3 Concentrator tube, Kuderna-Danish--10-mL, graduated (Kontes K-
570050-1025 or equivalent). Calibration must be checked at the volumes
employed in the test. Ground glass stopper is used to prevent
evaporation of extracts.
5.2.4 Evaporative flask, Kuderna-Danish--500-mL (Kontes K-57001-0500
or equivalent). Attach to concentrator tube with springs.
5.2.5 Snyder column, Kuderna-Danish--Three all macro (Kontes K-
503000-0121 or equivalent).
5.2.6 Snyder column, Kuderna-Danish--Two-ball macro (Kontes K-
569001-0219 or equivalent).
5.2.7 Vials--10 to 15-mL, amber glass, with Teflon-lined screw cap.
5.2.8 Continuous liquid--liquid extractor--Equipped with Teflon or
glass connecting joints and stopcocks requiring no lubrication.
(Hershberg-Wolf Extractor, Ace Glass Company, Vineland, N.J., P/N 6841-
10 or equivalent.)
5.3 Boiling chips--Approximately 10/40 mesh. Heat to 400 [deg]C for
30 min of Soxhlet extract with methylene chloride.
5.4 Water bath--Heated, with concentric ring cover, capable of
temperature control (2[deg]C). The bath should be
used in a hood.
5.5 Balance--Analytical, capable of accurately weighing 0.0001 g.
5.6 GC/MS system:
5.6.1 Gas Chromatograph--An analytical system complete with a
temperature programmable gas chromatograph and all required accessores
including syringes, analytical columns, and gases. The injection port
must be designed for on-column injection when using packed columns and
for splitless injection when using capillary columns.
5.6.2 Column for base/neutrals--1.8 m long x 2 mm ID glass, packed
with 3% SP-2250 on Supelcoport (100/120 mesh) or equivalent. This column
was used to develop the method performance statements in Section 16.
Guidelines for the use of alternate column packings are provided in
Section 13.1.
5.6.3 Column for acids--1.8 m long x 2 mm ID glass, packed with 1%
SP-1240DA on Supelcoport (100/120 mesh) or equivalent. This column was
used to develop the method performance statements in Section 16.
Guidelines for the use of alternate column packings are given in Section
13.1.
5.6.4 Mass spectrometer--Capable of scanning from 35 to 450 amu
every 7 s or less, utilizing a 70 V (nominal) electron energy in the
electron impact ionization mode, and producing a mass spectrum which
meets all the criteria in Table 9 when 50 ng of decafluorotriphenyl
phosphine (DFTPP; bis(perfluorophenyl) phenyl phosphine) is injected
through the GC inlet.
5.6.5 GC/MS interface--Any GC to MS interface that gives acceptable
calibration points at 50 ng per injection for each of the parameters of
interest and achieves all acceptable performance criteria (Section 12)
may be used. GC to MS interfaces constructed of all glass or glass-lined
materials are recommended. Glass can be deactivated by silanizing with
dichlorodimethylsilane.
5.6.6 Data system--A computer system must be interfaced to the mass
spectrometer that allows the contiluous acquisition and storage on
machine-readable media of all mass spectra obtained throughout the
duration of the chromatographic program. The computer must have software
that allows searching any GC/MS data file for specific m/z and plotting
such m/z abundances versus time or scan number. This type of plot is
defined as an Extracted Ion Current Profile (EICP). Software must also
be available that
[[Page 236]]
allows integrating the abundance in any EICP between specified time or
scan number limits.
6. Reagents
6.1 Reagent water--Reagent water is defined as a water in which an
interferent is not observed at the MDL of the parameters of interest.
6.2 Sodium hydroxide solution (10 N)--Dissolve 40 g of NaOH (ACS) in
reagent water and dilute to 100 mL.
6.3 Sodium thiosulfate--(ACS) Granular.
6.4 Sulfuric acid (1+1)--Slowly, add 50 mL of
H2SO4 (ACS, sp. gr. 1.84) to 50 mL of reagent
water.
6.5 Acetone, methanol, methlylene chloride--Pesticide quality or
equivalent.
6.6 Sodium sulfate--(ACS) Granular, anhydrous. Purify by heating at
400 [deg]C for 4 h in a shallow tray.
6.7 Stock standard solutions (1.00 [micro]g/[micro]L)--standard
solutions can be prepared from pure standard materials or purchased as
certified solutions.
6.7.1 Prepare stock standard solutions by accurately weighing about
0.0100 g of pure material. Dissolve the material in pesticide quality
acetone or other suitable solvent and dilute to volume in a 10-mL
volumetric flask. Larger volumes can be used at the convenience of the
analyst. When compound purity is assayed to be 96% or greater, the
weight may be used without correction to calculate the concentration of
the stock standard. Commercially prepared stock standards may be used at
any concentration if they are certified by the manufacturer or by an
independent source.
6.7.2 Transfer the stock standard solutions into Teflon-sealed
screw-cap bottles. Store at 4 [deg]C and protect from light. Stock
standard solutions should be checked frequently for signs of degradation
or evaporation, especially just prior to preparing calibration standards
from them.
6.7.3 Stock standard solutions must be replaced after six months, or
sooner if comparison with quality control check samples indicate a
problem.
6.8 Surrogate standard spiking solution--Select a minimum of three
surrogate compounds from Table 8. Prepare a surrogate standard spiking
solution containing each selected surrogate compound at a concentration
of 100 [micro]g/mL in acetone. Addition of 1.00 mL of this solution to
1000 mL of sample is equivalent to a concentration of 100 [micro]g/L of
each surrogate standard. Store the spiking solution at 4 [deg]C in
Teflon-sealed glass container. The solution should be checked frequently
for stability. The solution must be replaced after six months, or sooner
if comparison with quality control check standards indicates a problem.
6.9 DFTPP standard--Prepare a 25 [micro]g/mL solution of DFTPP in
acetone.
6.10 Quality control check sample concentrate--See Section 8.2.1.
7. Calibration
7.1 Establish gas chromatographic operating parameters equivalent to
those indicated in Table 4 or 5.
7.2 Internal standard calibration procedure--To use this approach,
the analyst must select three or more internal standards that are
similar in analytical behavior to the compounds of interest. The analyst
must further demonstrate that the measurement of the internal standards
is not affected by method or matrix interferences. Some recommended
internal standards are listed in Table 8. Use the base peak m/z as the
primary m/z for quantification of the standards. If interferences are
noted, use one of the next two most intense m/z quantities for
quantification.
7.2.1 Prepare calibration standards at a minimum of three
concentration levels for each parameter of interest by adding
appropriate volumes of one or more stock standards to a volumetric
flask. To each calibration standard or standard mixture, add a known
constant amount of one or more internal standards, and dilute to volume
with acetone. One of the calibration standards should be at a
concentration near, but above, the MDL and the other concentrations
should correspond to the expected range of concentrations found in real
samples or should define the working range of the GC/MS system.
7.2.2 Using injections of 2 to 5 [micro]L, analyze each calibration
standard according to Section 13 and tabulate the area of the primary
characteristic m/z (Tables 4 and 5) against concentration for each
compound and internal standard. Calculate response factors (RF) for each
compound using Equation 1.
[GRAPHIC] [TIFF OMITTED] TC15NO91.126
Equation 1
where:
As=Area of the characteristic m/z for the parameter to be
measured.
Ais=Area of the characteristic m/z for the internal standard.
Cis=Concentration of the internal standard ([micro]g/L).
Cs=Concentration of the parameter to be measured ([micro]g/
L).
If the RF value over the working range is a constant (<35% RSD), the RF
can be assumed to be invariant and the average RF can be used for
calculations. Alternatively, the results can be used to plot a
calibration curve of response ratios, As/Ais, vs.
RF.
7.3 The working calibration curve or RF must be verified on each
working day by the
[[Page 237]]
measurement of one or more calibration standards. If the response for
any parameter varies from the predicted response by more than 20%, the test must be repeated uning a fresh calibration
standard. Alternatively, a new calibration curve must be prepared for
that compound.
8. Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality control program. The minimum requirements of this program
consist of an initial demonstration of laboratory capability and an
ongoing analysis of spiked samples to evaluate and document data
quality. The laboratory must maintain records to document the quality of
data that is generated. Ongoing data quality checks are compared with
established performance criteria to determine if the results of analyses
meet the performance characteristics of the method. When results of
sample spikes indicate atypical method performance, a quality control
check standard must be analyzed to confirm that the measurements were
performed in an in-control mode of operation.
8.1.1 The analyst must make an initial, one-time, demonstration of
the ability to generate acceptable accuracy and precision with this
method. This ability is established as described in Section 8.2.
8.1.2 In recognition of advances that are occuring in
chromatography, the analyst is permitted certain options (detailed in
Sections 10.6 and 13.1) to improve the separations or lower the cost of
measurements. Each time such a modification is made to the method, the
analyst is required to repeat the procedure in Section 8.2.
8.1.3 Before processing any samples, the analyst must analyze a
reagent water blank to demonstrate that interferences from the
analytical system and glassware are under control. Each time a set of
samples is extracted or reagents are changed, a reagent water blank must
be processed as a safeguard against laboratory contamination.
8.1.4 The laboratory must, on an ongoing basis, spike and analyze a
minimum of 5% of all samples to monitor and evaluate laboratory data
quality. This procedure is described in Section 8.3.
8.1.5 The laboratory must, on an ongoing basis, demonstrate through
the analyses of quality control check standards that the operation of
the measurement system is in control. This procedure is described in
Section 8.4. The frequency of the check standard analyses is equivalent
to 5% of all samples analyzed but may be reduced if spike recoveries
from samples (Section 8.3) meet all specified quality control criteria.
8.1.6 The laboratory must maintain performance records to document
the quality of data that is generated. This procedure is described in
Section 8.5.
8.2 To establish the ability to generate acceptable accuracy and
precision, the analyst must perform the following operations.
8.2.1 A quality control (QC) check sample concentrate is required
containing each parameter of interest at a concentration of 100
[micro]g/mL in acetone. Multiple solutions may be required. PCBs and
multicomponent pesticides may be omitted from this test. The QC check
sample concentrate must be obtained from the U.S. Environmental
Protection Agency, Environmental Monitoring and Support Laboratory in
Cincinnati, Ohio, if available. If not available from that source, the
QC check sample concentrate must be obtained from another external
source. If not available from either source above, the QC check sample
concentrate must be prepared by the laboratory using stock standards
prepared independently from those used for calibration.
8.2.2 Using a pipet, prepare QC check samples at a concentration of
100 [micro]g/L by adding 1.00 mL of QC check sample concentrate to each
of four 1-L aliquots of reagent water.
8.2.3 Analyze the well-mixed QC check samples according to the
method beginning in Section 10 or 11.
8.2.4 Calculate the average recovery (X) in [micro]g/L, and the
standard deviation of the recovery (s) in [micro]g/L, for each parameter
using the four results.
8.2.5 For each parameter compare s and X with the corresponding
acceptance criteria for precision and accuracy, respectively, found in
Table 6. If s and X for all parameters of interest meet the acceptance
criteria, the system performance is acceptable and analysis of actual
samples can begin. If any individual s exceeds the precision limit or
any individual X falls outside the range for accuracy, the system
performance is unacceptable for that parameter.
Note: The large number of parameters in Table 6 present a
substantial probability that one or more will fail at least one of the
acceptance criteria when all parameters are analyzed.
8.2.6 When one or more of the parameters tested fail at least one of
the acceptance criteria, the analyst must proceed according to Section
8.2.6.1 or 8.2.6.2.
8.2.6.1 Locate and correct the source of the problem and repeat the
test for all parameters of interest beginning with Section 8.2.2.
8.2.6.2 Beginning with Section 8.2.2, repeat the test only for those
parameters that failed to meet criteria. Repeated failure, however, will
confirm a general problem with the measurement system. If this occurs,
locate and correct the source of the problem and repeat the test for all
compounds of interest beginning with Section 8.2.2.
8.3 The laboratory must, on an ongoing basis, spike at least 5% of
the samples from each sample site being monitored to assess
[[Page 238]]
accuracy. For laboratories analyzing 1 to 20 samples per month, at least
one spiked sample per month is required.
8.3.1. The concentration of the spike in the sample should be
determined as follows:
8.3.1 If, as in compliance monitoring, the concentration of a
specific parameter in the sample is being checked against a regulatory
concentration limit, the spike should be at that limit or 1 to 5 times
higher than the background concentration determined in Section 8.3.2,
whichever concentration would be larger.
8.3.1.2 If the concentration of a specific parameter in the sample
is not being checked against a limit specific to that parameter, the
spike should be at 100 [micro]g/L or 1 to 5 times higher than the
background concentration determined in Section 8.3.2, whichever
concentration would be larger.
8.3.1.3 If it is impractical to determine background levels before
spiking (e.g., maximum holding times will be exceeded), the spike
concentration should be (1) the regulatory concentration limit, if any;
or, if none (2) the larger of either 5 times higher than the expected
background concentration or 100 [micro]g/L.
8.3.2 Analyze one sample aliquot to determine the background
concentration (B) of each parameter. If necessary, prepare a new QC
check sample concentrate (Section 8.2.1) appropriate for the background
concentrations in the sample. Spike a second sample aliquot with 1.0 mL
of the QC check sample concentrate and analyze it to determine the
concentration after spiking (A) of each parameter. Calculate each
percent recovery (P) as 100(A-B)%/T, where T is the known true value of
the spike.
8.3.3 Compare the percent recovery (P) for each parameter with the
corresponding QC acceptance criteria found in Table 6. These acceptance
criteria were calculated to include an allowance for error in
measurement of both the background and spike concentrations, assuming a
spike to background ratio of 5:1. This error will be accounted for to
the extent that the analyst's spike to background ratio approaches 5:1.
\7\ If spiking was performed at a concentration lower than 100 [micro]g/
L, the analyst must use either the QC acceptance criteria in Table 6, or
optional QC acceptance criteria calculated for the specific spike
concentration. To calculate optional acceptance criteria for the
recovery of a parameter: (1) Calculate accuracy (X') using the equation
in Table 7, substituting the spike concentration (T) for C; (2)
calculate overall precision (S') using the equation in Table 7,
substituting X' for X; (3) calculate the range for recovery at the spike
concentration as (100 X'/T)2.44(100 S'/T)% \7\
8.3.4 If any individual P falls outside the designated range for
recovery, that parameter has failed the acceptance criteria. A check
standard containing each parameter that failed the criteria must be
analyzed as described in Section 8.4.
8.4 If any parameter fails the acceptance criteria for recovery in
Section 8.3, a QC check standard containing each parameter that failed
must be prepared and analyzed.
Note: The frequency for the required analysis of a QC check standard
will depend upon the number of parameters being simultaneously tested,
the complexity of the sample matrix, and the performance of the
laboratory. If the entire list of single-component parameters in Table 6
must be measured in the sample in Section 8.3, the probability that the
analysis of a QC check standard will be required is high. In this case
the QC check standard should be routinely analyzed with the spike
sample.
8.4.1 Prepare the QC check standard by adding 1.0 mL of QC check
sample concentrate (Section 8.2.1 or 8.3.2) to 1 L of reagent water. The
QC check standard needs only to contain the parameters that failed
criteria in the test in Section 8.3.
8.4.2 Analyze the QC check standard to determine the concentration
measured (A) of each parameter. Calculate each percent recovery
(PS) as 100 (A/T)%, where T is the true value of the standard
concentration.
8.4.3 Compare the percent recovery (Ps) for each
parameter with the corresponding QC acceptance criteria found in Table
6. Only parameters that failed the test in Section 8.3 need to be
compared with these criteria. If the recovery of any such parameter
falls outside the designated range, the laboratory performance for that
parameter is judged to be out of control, and the problem must be
immediately identified and corrected. The analytical result for that
parameter in the unspiked sample is suspect and may not be reported for
regulatory compliance purposes.
8.5 As part of the QC program for the laboratory, method accuracy
for wastewater samples must be assessed and records must be maintained.
After the analysis of five spiked wastewater samples as in Section 8.3,
calculate the average percent recovery (P) and the standard deviation of
the percent recovery (sp). Express the accuracy assessment as
a percent interval from P-2sp to P+2sp. If P=90%
and sp=10%, for example, the accuracy interval is expressed
as 70-110%. Update the accuracy assessment for each parameter on a
regular basis (e.g. after each five to ten new accuracy measurements).
8.6 As a quality control check, the laboratory must spike all
samples with the surrogate standard spiking solution as described in
Section 10.2, and calculate the percent recovery of each surrogate
compound.
8.7 It is recommended that the laboratory adopt additional quality
assurance practices for use with this method. The specific practices
that are most productive depend upon the needs of the laboratory and the
nature of
[[Page 239]]
the samples. Field duplicates may be analyzed to assess the precision of
the environmental measurements. Whenever possible, the laboratory should
analyze standard reference materials and participate in relevant
performance evaluation studies.
9. Sample Collection, Preservation, and Handling
9.1 Grab samples must be collected in glass containers. Conventional
sampling practices \8\ should be followed, except that the bottle must
not be prerinsed with sample before collection. Composite samples should
be collected in refrigerated glass containers in accordance with the
requirements of the program. Automatic sampling equipment must be as
free as possible of Tygon tubing and other potential sources of
contamination.
9.2 All sampling must be iced or refrigerated at 4 [deg]C from the
time of collection until extraction. Fill the sample bottles and, if
residual chlorine is present, add 80 mg of sodium thiosulfate per liter
of sample and mix well. EPA Methods 330.4 and 330.5 may be used for
measurement of residual chlorine. \9\ Field test kits are available for
this purpose.
9.3 All samples must be extracted within 7 days of collection and
completely analyzed within 40 days of extraction.
10. Separatory Funnel Extraction
10.1 Samples are usually extracted using separatory funnel
techniques. If emulsions will prevent achieving acceptable solvent
recovery with separatory funnel extractions, continuous extraction
(Section 11) may be used. The separatory funnel extraction scheme
described below assumes a sample volume of 1 L. When sample volumes of 2
L are to be extracted, use 250, 100, and 100-mL volumes of methylene
chloride for the serial extraction of the base/neutrals and 200, 100,
and 100-mL volumes of methylene chloride for the acids.
10.2 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Pour the entire sample into a 2-L
separatory funnel. Pipet 1.00 mL of the surrogate standard spiking
solution into the separatory funnel and mix well. Check the pH of the
sample with wide-range pH paper and adjust to pH11 with
sodium hydroxide solution.
10.3 Add 60 mL of methylene chloride to the sample bottle, seal, and
shake for 30 s to rinse the inner surface. Transfer the solvent to the
separatory funnel and extract the sample by shaking the funnel for 2
min. with periodic venting to release excess pressure. Allow the organic
layer to separate from the water phase for a minimum of 10 min. If the
emulsion interface between layers is more than one-third the volume of
the solvent layer, the analyst must employ mechanical techniques to
complete the phase separation. The optimum technique depends upon the
sample, but may include stirring, filtration of the emulsion through
glass wool, centrifugation, or other physical methods. Collect the
methylene chloride extract in a 250-mL Erlenmeyer flask. If the emulsion
cannot be broken (recovery of less than 80% of the methylene chloride,
corrected for the water solubility of methylene chloride), transfer the
sample, solvent, and emulsion into the extraction chamber of a
continuous extractor and proceed as described in Section 11.3.
10.4 Add a second 60-mL volume of methylene chloride to the sample
bottle and repeat the extraction procedure a second time, combining the
extracts in the Erlenmeyer flask. Perform a third extraction in the same
manner. Label the combined extract as the base/neutral fraction.
10.5 Adjust the pH of the aqueous phase to less than 2 using
sulfuric acid. Serially extract the acidified aqueous phase three times
with 60-mL aliquots of methylene chloride. Collect and combine the
extracts in a 250-mL Erlenmeyer flask and label the combined extracts as
the acid fraction.
10.6 For each fraction, assemble a Kuderna-Danish (K-D) concentrator
by attaching a 10-mL concentrator tube to a 500-mL evaporative flask.
Other concentration devices or techniques may be used in place of the K-
D concentrator if the requirements of Section 8.2 are met.
10.7 For each fraction, pour the combined extract through a solvent-
rinsed drying column containing about 10 cm of anhydrous sodium sulfate,
and collect the extract in the K-D concentrator. Rinse the Erlenmeyer
flask and column with 20 to 30 mL of methylene chloride to complete the
quantitative transfer.
10.8 Add one or two clean boiling chips and attach a three-ball
Snyder column to the evaporative flask for each fraction. Prewet each
Snyder column by adding about 1 mL of methylene chloride to the top.
Place the K-D apparatus on a hot water bath (60 to 65 [deg]C) so that
the concentrator tube is partially immersed in the hot water, and the
entire lower rounded surface of the flask is bathed with hot vapor.
Adjust the vertical position of the apparatus and the water temperature
as required to complete the concentration in 15 to 20 min. At the proper
rate of distillation the balls of the column will actively chatter but
the chambers will not flood with condensed solvent. When the apparent
volume of liquid reaches 1 mL, remove the K-D apparatus from the water
bath and allow it to drain and cool for at least 10 min. Remove the
Snyder column and rinse the flask and its lower joint into the
concentrator tube with 1 to 2 mL of methylene chloride. A 5-mL syringe
is recommended for this operation.
[[Page 240]]
10.9 Add another one or two clean boiling chips to the concentrator
tube for each fraction and attach a two-ball micro-Snyder column. Prewet
the Snyder column by adding about 0.5 mL of methylene chloride to the
top. Place the K-D apparatus on a hot water bath (60 to 65 [deg]C) so
that the concentrator tube is partially immersed in hot water. Adjust
the vertical position of the apparatus and the water temperature as
required to complete the concentration in 5 to 10 min. At the proper
rate of distillation the balls of the column will actively chatter but
the chambers will not flood with condensed solvent. When the apparent
volume of liquid reaches about 0.5 mL, remove the K-D apparatus from the
water bath and allow it to drain and cool for at least 10 min. Remove
the Snyder column and rinse the flask and its lower joint into the
concentrator tube with approximately 0.2 mL of acetone or methylene
chloride. Adjust the final volume to 1.0 mL with the solvent. Stopper
the concentrator tube and store refrigerated if further processing will
not be performed immediately. If the extracts will be stored longer than
two days, they should be transferred to Teflon-sealed screw-cap vials
and labeled base/neutral or acid fraction as appropriate.
10.10 Determine the original sample volume by refilling the sample
bottle to the mark and transferring the liquid to a 1000-mL graduated
cylinder. Record the sample volume to the nearest 5 mL.
11. Continuous Extraction
11.1 When experience with a sample from a given source indicates
that a serious emulsion problem will result or an emulsion is
encountered using a separatory funnel in Section 10.3, a continuous
extractor should be used.
11.2 Mark the water meniscus on the side of the sample bottle for
later determination of sample volume. Check the pH of the sample with
wide-range pH paper and adjust to pH 11 with sodium hydroxide
solution. Transfer the sample to the continuous extractor and using a
pipet, add 1.00 mL of surrogate standard spiking solution and mix well.
Add 60 mL of methylene chloride to the sample bottle, seal, and shake
for 30 s to rinse the inner surface. Transfer the solvent to the
extractor.
11.3 Repeat the sample bottle rinse with an additional 50 to 100-mL
portion of methylene chloride and add the rinse to the extractor.
11.4 Add 200 to 500 mL of methylene chloride to the distilling
flask, add sufficient reagent water to ensure proper operation, and
extract for 24 h. Allow to cool, then detach the distilling flask. Dry,
concentrate, and seal the extract as in Sections 10.6 through 10.9.
11.5 Charge a clean distilling flask with 500 mL of methylene
chloride and attach it to the continuous extractor. Carefully, while
stirring, adjust the pH of the aqueous phase to less than 2 using
sulfuric acid. Extract for 24 h. Dry, concentrate, and seal the extract
as in Sections 10.6 through 10.9.
12. Daily GC/MS Performance Tests
12.1 At the beginning of each day that analyses are to be performed,
the GC/MS system must be checked to see if acceptable performance
criteria are achieved for DFTPP. \10\ Each day that benzidine is to be
determined, the tailing factor criterion described in Section 12.4 must
be achieved. Each day that the acids are to be determined, the tailing
factor criterion in Section 12.5 must be achieved.
12.2 These performance tests require the following instrumental
parameters:
Electron Energy: 70 V (nominal)
Mass Range: 35 to 450 amu
Scan Time: To give at least 5 scans per peak but not to exceed 7 s per
scan.
12.3 DFTPP performance test--At the beginning of each day, inject 2
[micro]L (50 ng) of DFTPP standard solution. Obtain a background-
corrected mass spectra of DFTPP and confirm that all the key m/z
criteria in Table 9 are achieved. If all the criteria are not achieved,
the analyst must retune the mass spectrometer and repeat the test until
all criteria are achieved. The performance criteria must be achieved
before any samples, blanks, or standards are analyzed. The taililg
factor tests in Sections 12.4 and 12.5 may be performed simultaneously
with the DFTPP test.
12.4 Column performance test for base/neutrals--At the beginning of
each day that the base/neutral fraction is to be analyzed for benzidine,
the benzidine tailing factor must be calculated. Inject 100 ng of
benzidine either separately or as a part of a standard mixture that may
contain DFTPP and calculate the tailing factor. The benzidine tailing
factor must be less than 3.0. Calculation of the tailing factor is
illustrated in Figure 13. \11\ Replace the column packing if the tailing
factor criterion cannot be achieved.
12.5 Column performance test for acids--At the beginning of each day
that the acids are to be determined, inject 50 ng of pentachlorophenol
either separately or as a part of a standard mix that may contain DFTPP.
The tailing factor for pentachlorophenol must be less than 5.
Calculation of the tailing factor is illustrated in Figure 13. \11\
Replace the column packing if the tailing factor criterion cannot be
achieved.
13. Gas Chromatography/Mass Spectrometry
13.1 Table 4 summarizes the recommended gas chromatographic
operating conditions for the base/neutral fraction. Table 5 summarizes
the recommended gas chromatographic
[[Page 241]]
operating conditions for the acid fraction. Included in these tables are
retention times and MDL that can be achieved under these conditions.
Examples of the separations achieved by these columns are shown in
Figures 1 through 12. Other packed or capillary (open-tubular) columns
or chromatographic conditions may be used if the requirements of Section
8.2 are met.
13.2 After conducting the GC/MS performance tests in Section 12,
calibrate the system daily as described in Section 7.
13.3 The internal standard must be added to sample extract and mixed
thoroughly immediately before it is injected into the instrument. This
procedure minimizes losses due to adsorption, chemical reaction or
evaporation.
13.4 Inject 2 to 5 [micro]L of the sample extract or standard into
the GC/MS system using the solvent-flush technique. \12\ Smaller (1.0
[micro]L) volumes may be injected if automatic devices are employed.
Record the volume injected to the nearest 0.05 [micro]L.
13.5 If the response for any m/z exceeds the working range of the
GC/MS system, dilute the extract and reanalyze.
13.6 Perform all qualitative and quantitative measurements as
described in Sections 14 and 15. When the extracts are not being used
for analyses, store them refrigerated at 4[deg]C, protected from light
in screw-cap vials equipped with unpierced Teflon-lined septa.
14. Qualitative Identification
14.1 Obtain EICPs for the primary m/z and the two other masses
listed in Tables 4 and 5. See Section 7.3 for masses to be used with
internal and surrogate standards. The following criteria must be met to
make a qualitative identification:
14.1.1 The characteristic masses of each parameter of interest must
maximize in the same or within one scan of each other.
14.1.2 The retention time must fall within 30
s of the retention time of the authentic compound.
14.1.3 The relative peak heights of the three characteristic masses
in the EICPs must fall within 20% of the relative
intensities of these masses in a reference mass spectrum. The reference
mass spectrum can be obtained from a standard analyzed in the GC/MS
system or from a reference library.
14.2 Structural isomers that have very similar mass spectra and less
than 30 s difference in retention time, can be explicitly identified
only if the resolution between authentic isomers in a standard mix is
acceptable. Acceptable resolution is achieved if the baseline to valley
height between the isomers is less than 25% of the sum of the two peak
heights. Otherwise, structural isomers are identified as isomeric pairs.
15. Calculations
15.1 When a parameter has been identified, the quantitation of that
parameter will be based on the integrated abundance from the EICP of the
primary characteristic m/z in Tables 4 and 5. Use the base peak m/z for
internal and surrogate standards. If the sample produces an interference
for the primary m/z, use a secondary characteristic m/z to quantitate.
Calculate the concentration in the sample using the response factor
(RF) determined in Section 7.2.2 and Equation 3.
[GRAPHIC] [TIFF OMITTED] TC15NO91.127
Equation 3
where:
As=Area of the characteristic m/z for the parameter or
surrogate standard to be measured.
Ais=Area of the characteristic m/z for the internal standard.
Is=Amount of internal standard added to each extract
([micro]g).
Vo=Volume of water extracted (L).
15.2 Report results in [micro]g/L without correction for recovery
data. All QC data obtained should be reported with the sample results.
16. Method Performance
16.1 The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the value is above zero. \1\ The MDL concentrations
listed in Tables 4 and 5 were obtained using reagent water. \13\ The MDL
actually achieved in a given analysis will vary depending on instrument
sensitivity and matrix effects.
16.2 This method was tested by 15 laboratories using reagent water,
drinking water, surface water, and industrial wastewaters spiked at six
concentrations over the range 5 to 1300 [micro]g/L. \14\ Single operator
precision, overall precision, and method accuracy were found to be
directly related to the concentration of the parameter and essentially
independent of the sample matrix. Linear equations to describe these
relationships are presented in Table 7.
17. Screening Procedure for 2,3,7,8-Tetrachlorodibenzo-p-dioxin
(2,3,7,8-TCDD)
17.1 If the sample must be screened for the presence of 2,3,7,8-
TCDD, it is recommended that the reference material not be handled in
the laboratory unless extensive safety precautions are employed. It is
sufficient to analyze the base/neutral extract by selected ion
monitoring (SIM) GC/MS techniques, as follows:
17.1.1 Concentrate the base/neutral extract to a final volume of 0.2
ml.
[[Page 242]]
17.1.2 Adjust the temperature of the base/neutral column (Section
5.6.2) to 220 [deg]C.
17.1.3 Operate the mass spectrometer to acquire data in the SIM mode
using the ions at m/z 257, 320 and 322 and a dwell time no greater than
333 milliseconds per mass.
17.1.4 Inject 5 to 7 [micro]L of the base/neutral extract. Collect
SIM data for a total of 10 min.
17.1.5 The possible presence of 2,3,7,8-TCDD is indicated if all
three masses exhibit simultaneous peaks at any point in the selected ion
current profiles.
17.1.6 For each occurrence where the possible presence of 2,3,7,8-
TCDD is indicated, calculate and retain the relative abundances of each
of the three masses.
17.2 False positives to this test may be caused by the presence of
single or coeluting combinations of compounds whose mass spectra contain
all of these masses.
17.3 Conclusive results of the presence and concentration level of
2,3,7,8-TCDD can be obtained only from a properly equipped laboratory
through the use of EPA Method 613 or other approved alternate test
procedures.
References
1. 40 CFR part 136, appendix B.
2. ``Sampling and Analysis Procedures for Screening of Industrial
Effluents for Priority Pollutants,'' U.S. Environmental Protection
Agency, Environmental Monitoring and Support Laboratory, Cincinnati,
Ohio 45268, March 1977, Revised April 1977. Available from Effluent
Guidelines Division, Washington, DC 20460.
3. ASTM Annual Book of Standards, Part 31, D3694-78. ``Standard
Practices for Preparation of Sample Containers and for Preservation of
Organic Constituents,'' American Society for Testing and Materials,
Philadelphia.
4. ``Carcinogens--Working With Carcinogens,'' Department of Health,
Education, and Welfare, Public Health Service, Center for Disease
Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
5. ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206
(Revised, January 1976).
6. ``Safety in Academic Chemistry Laboratories,''American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
7. Provost, L.P., and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15, 58-63 (1983). (The value 2.44
used in the equation in Section 8.3.3 is two times the value 1.22
derived in this report.)
8. ASTM Annual Book of Standards, Part 31, D3370-76. ``Standard
Practices for Sampling Water,'' American Society for Testing and
Materials, Philadelphia.
9. ``Methods 330.4 (Titrimetric, DPD-FAS) and 330.5
(Spectrophotometric, DPD) for Chlorine, Total Residual,'' Methods for
Chemical Analysis of Water and Wastes, EPA-600/4-79-020, U.S.
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268, March 1979.
10. Eichelberger, J.W., Harris, L.E., and Budde, W.L. ``Reference
Compound to Calibrate Ion Abundance Measurement in Gas Chromatography-
Mass Spectometry,'' Analytical Chemistry, 47, 995 (1975).
11. McNair, N.M. and Bonelli, E.J. ``Basic Chromatography,''
Consolidated Printing, Berkeley, California, p. 52, 1969.
12. Burke, J.A. ``Gas Chromatography for Pesticide Residue Analysis;
Some Practical Aspects,'' Journal of the Association of Official
Analytical Chemists, 48, 1037 (1965).
13. Olynyk, P., Budde, W.L., and Eichelberger, J.W. ``Method
Detection Limit for Methods 624 and 625,'' Unpublished report, May 14,
1980.
14. ``EPA Method Study 30, Method 625, Base/Neutrals, Acids, and
Pesticides,'' EPA 600/4-84-053, National Technical Information Service,
PB84-206572, Springfield, Virginia 22161, June 1984.
Table 1--Base/Neutral Extractables
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
Acenaphthene..................................... 34205 83-32-9
Acenaphthylene................................... 34200 208-96-8
Anthracene....................................... 34220 120-12-7
Aldrin........................................... 39330 309-00-2
Benzo(a)anthracene............................... 34526 56-55-3
Benzo(b)fluoranthene............................. 34230 205-99-2
Benzo(k)fluoranthene............................. 34242 207-08-9
Benzo(a)pyrene................................... 34247 50-32-8
Benzo(ghi)perylene............................... 34521 191-24-2
Benzyl butyl phthalate........................... 34292 85-68-7
[beta]-BHC....................................... 39338 319-85-7
[delta]-BHC...................................... 34259 319-86-8
Bis(2-chloroethyl) ether......................... 34273 111-44-4
Bis(2-chloroethoxy)methane....................... 34278 111-91-1
Bis(2-ethylhexyl) phthalate...................... 39100 117-81-7
Bis(2-chloroisopropyl) ether \a\................. 34283 108-60-1
4-Bromophenyl phenyl ether \a\................... 34636 101-55-3
Chlordane........................................ 39350 57-74-9
2-Chloronaphthalele.............................. 34581 91-58-7
4-Chlorophenyl phenyl ether...................... 34641 7005-72-3
Chrysene......................................... 34320 218-01-9
4,4'-DDD......................................... 39310 72-54-8
4,4'-DDE......................................... 39320 72-55-9
4,4'-DDT......................................... 39300 50-29-3
Dibenzo(a,h)anthracene........................... 34556 53-70-3
Di-n-butylphthalate.............................. 39110 84-74-2
1,3-Dichlorobenzene.............................. 34566 541-73-1
1,2-Dichlorobenzene.............................. 34536 95-50-1
1,4-Dichlorobenzene.............................. 34571 106-46-7
3,3'-Dichlorobenzidine........................... 34631 91-94-1
Dieldrin......................................... 39380 60-57-1
Diethyl phthalate................................ 34336 84-66-2
Dimethyl phthalate............................... 34341 131-11-3
2,4-Dinitrotoluene............................... 34611 121-14-2
2,6-Dinitrotoluene............................... 34626 606-20-2
Di-n-octylphthalate.............................. 34596 117-84-0
Endosulfan sulfate............................... 34351 1031-07-8
[[Page 243]]
Endrin aldehyde.................................. 34366 7421-93-4
Fluoranthene..................................... 34376 206-44-0
Fluorene......................................... 34381 86-73-7
Heptachlor....................................... 39410 76-44-8
Heptchlor epoxide................................ 39420 1024-57-3
Hexachlorobenzene................................ 39700 118-74-1
Hexachlorobutadiene.............................. 34391 87-68-3
Hexachloroethane................................. 34396 67-72-1
Indeno(1,2,3-cd)pyrene........................... 34403 193-39-5
Isophorone....................................... 34408 78-59-1
Naphthalene...................................... 34696 91-20-3
Nitrobenzene..................................... 34447 98-95-3
N-Nitrosodi-n-propylamine........................ 34428 621-64-7
PCB-1016......................................... 34671 12674-11-2
PCB-1221......................................... 39488 11104-28-2
PCB-1232......................................... 39492 11141-16-5
PCB-1242......................................... 39496 53469-21-9
PCB-1248......................................... 39500 12672-29-6
PCB-1254......................................... 39504 11097-69-1
PCB-1260......................................... 39508 11096-82-5
Phenanthrene..................................... 34461 85-01-8
Pyrene........................................... 34469 129-00-0
Toxaphene........................................ 39400 8001-35-2
1,2,4-Trichlorobenzene........................... 34551 120-82-1
------------------------------------------------------------------------
\a\ The proper chemical name is 2,2'-oxybis(1-chloropropane).
Table 2--Acid Extractables
------------------------------------------------------------------------
STORET
Parameter No. CAS No.
------------------------------------------------------------------------
4-Chloro-3-methylphenol.......................... 34452 59-50-7
2-Chlorophenol................................... 34586 95-57-8
2,4-Dichlorophenol............................... 34601 120-83-2
2,4-Dimethylphenol............................... 34606 105-67-9
2,4-Dinitrophenol................................ 34616 51-28-5
2-Methyl-4,6-dinitrophenol....................... 34657 534-52-1
2-Nitrophenol.................................... 34591 88-75-5
4-Nitrophenol.................................... 34646 100-02-7
Pentachlorophenol................................ 39032 87-86-5
Phenol........................................... 34694 108-95-2
2,4,6-Trichlorophenol............................ 34621 88-06-2
------------------------------------------------------------------------
Table 3--Additional Extractable Parameters \a\
------------------------------------------------------------------------
STORET
Parameter No. CAS No. Method
------------------------------------------------------------------------
Benzidine................................ 39120 92-87-5 605
[beta]-BHC............................... 39337 319-84-6 608
[delta]-BHC.............................. 39340 58-89-8 608
Endosulfan I............................. 34361 959-98-8 608
Endosulfan II............................ 34356 33213-65-9 608
Endrin................................... 39390 72-20-8 608
Hexachlorocylopentadiene................. 34386 77-47-4 612
N-Nitrosodimethylamine................... 34438 62-75-9 607
N-Nitrosodiphenylamine................... 34433 86-30-6 607
------------------------------------------------------------------------
\a\ See Section 1.2.
Table 4--Chromatographic Conditions, Method Detection Limits, and Characteristic Masses for Base/Neutral Extractables
--------------------------------------------------------------------------------------------------------------------------------------------------------
Method Characteristic masses
Retention detection -------------------------------------------------------------
Parameter time limit Electron impact Chemical ionization
(min) ([micro]g/ -------------------------------------------------------------
L) Primary Secondary Secondary Methane Methane Methane
--------------------------------------------------------------------------------------------------------------------------------------------------------
1,3-Dichlorobenzene................................................ 7.4 1.9 146 148 113 146 148 150
1,4-Dichlorobenzene................................................ 7.8 4.4 146 148 113 146 148 150
Hexachloroethane................................................... 8.4 1.6 117 201 199 199 201 203
Bis(2-chloroethyl) ether \a\....................................... 8.4 5.7 93 63 95 63 107 109
1,2-Dichlorobenzene................................................ 8.4 1.9 146 148 113 146 148 150
Bis(2-chloroisopropyl) ether \a\................................... 9.3 5.7 45 77 79 77 135 137
N-Nitrosodi-n-propylamine.......................................... ......... .......... 130 42 101 ........ ........ ........
Nitrobenzene....................................................... 11.1 1.9 77 123 65 124 152 164
Hexachlorobutadiene................................................ 11.4 0.9 225 223 227 223 225 227
1,2,4-Trichlorobenzene............................................. 11.6 1.9 180 182 145 181 183 209
Isophorone......................................................... 11.9 2.2 82 95 138 139 167 178
Naphthalene........................................................ 12.1 1.6 128 129 127 129 157 169
Bis(2-chloroethoxy) methane........................................ 12.2 5.3 93 95 123 65 107 137
Hexachlorocyclopentadiene \a\...................................... 13.9 .......... 237 235 272 235 237 239
2-Chloronaphthalene................................................ 15.9 1.9 162 164 127 163 191 203
Acenaphthylene..................................................... 17.4 3.5 152 151 153 152 153 181
Acenaphthene....................................................... 17.8 1.9 154 153 152 154 155 183
Dimethyl phthalate................................................. 18.3 1.6 163 194 164 151 163 164
2,6-Dinitrotoluene................................................. 18.7 1.9 165 89 121 183 211 223
Fluorene........................................................... 19.5 1.9 166 165 167 166 167 195
4-Chlorophenyl phenyl ether........................................ 19.5 4.2 204 206 141 ........ ........ ........
2,4-Dinitrotoluene................................................. 19.8 5.7 165 63 182 183 211 223
Diethyl phthalate.................................................. 20.1 1.9 149 177 150 177 223 251
N-Nitrosodiphenylamine \b\......................................... 20.5 1.9 169 168 167 169 170 198
Hexachlorobenzene.................................................. 21.0 1.9 284 142 249 284 286 288
[beta]-BHC \b\..................................................... 21.1 .......... 183 181 109 ........ ........ ........
4-Bromophenyl phenyl ether......................................... 21.2 1.9 248 250 141 249 251 277
[delta]-BHC \b\.................................................... 22.4 .......... 183 181 109 ........ ........ ........
Phenanthrene....................................................... 22.8 5.4 178 179 176 178 179 207
Anthracene......................................................... 22.8 1.9 178 179 176 178 179 207
[beta]-BHC......................................................... 23.4 4.2 181 183 109 ........ ........ ........
[[Page 244]]
Heptachlor......................................................... 23.4 1.9 100 272 274 ........ ........ ........
[delta]-BHC........................................................ 23.7 3.1 183 109 181 ........ ........ ........
Aldrin............................................................. 24.0 1.9 66 263 220 ........ ........ ........
Dibutyl phthalate.................................................. 24.7 2.5 149 150 104 149 205 279
Heptachlor epoxide................................................. 25.6 2.2 353 355 351 ........ ........ ........
Endosulfan I \b\................................................... 26.4 .......... 237 339 341 ........ ........ ........
Fluoranthene....................................................... 26.5 2.2 202 101 100 203 231 243
Dieldrin........................................................... 27.2 2.5 79 263 279 ........ ........ ........
4,4'-DDE........................................................... 27.2 5.6 246 248 176 ........ ........ ........
Pyrene............................................................. 27.3 1.9 202 101 100 203 231 243
Endrin \b\......................................................... 27.9 .......... 81 263 82 ........ ........ ........
Endosulfan II \b\.................................................. 28.6 .......... 237 339 341 ........ ........ ........
4,4'-DDD........................................................... 28.6 2.8 235 237 165 ........ ........ ........
Benzidine \b\...................................................... 28.8 44 184 92 185 185 213 225
4,4'-DDT........................................................... 29.3 4.7 235 237 165 ........ ........ ........
Endosulfan sulfate................................................. 29.8 5.6 272 387 422 ........ ........ ........
Endrin aldehyde.................................................... ......... .......... 67 345 250 ........ ........ ........
Butyl benzyl phthalate............................................. 29.9 2.5 149 91 206 149 299 327
Bis(2-ethylhexyl) phthalate........................................ 30.6 2.5 149 167 279 149 ........ ........
Chrysene........................................................... 31.5 2.5 228 226 229 228 229 257
Benzo(a)anthracene................................................. 31.5 7.8 228 229 226 228 229 257
3,3'-Dichlorobenzidine............................................. 32.2 16.5 252 254 126 ........ ........
Di-n-octyl phthalate............................................... 32.5 2.5 149
Benzo(b)fluoranthene............................................... 34.9 4.8 252 253 125 252 253 281
Benzo(k)fluoranthene............................................... 34.9 2.5 252 253 125 252 253 281
Benzo(a)pyrene..................................................... 36.4 2.5 252 253 125 252 253 281
Indeno(1,2,3-cd) pyrene............................................ 42.7 3.7 276 138 277 276 277 305
Dibenzo(a,h)anthracene............................................. 43.2 2.5 278 139 279 278 279 307
Benzo(ghi)perylene................................................. 45.1 4.1 276 138 277 276 277 305
N-Nitrosodimethylamine \b\......................................... ......... .......... 42 74 44 ........ ........ ........
Chlordane \c\...................................................... 19-30 .......... 373 375 377 ........ ........ ........
Toxaphene \c\...................................................... 25-34 .......... 159 231 233 ........ ........ ........
PCB 1016 \c\....................................................... 18-30 .......... 224 260 294 ........ ........ ........
PCB 1221 \c\....................................................... 15-30 30 190 224 260 ........ ........ ........
PCB 1232 \c\....................................................... 15-32 .......... 190 224 260 ........ ........ ........
PCB 1242 \c\....................................................... 15-32 .......... 224 260 294 ........ ........ ........
PCB 1248 \c\....................................................... 12-34 .......... 294 330 262 ........ ........ ........
PCB 1254 \c\....................................................... 22-34 36 294 330 362 ........ ........ ........
PCB 1260 \c\....................................................... 23-32 .......... 330 362 394 ........ ........ ........
--------------------------------------------------------------------------------------------------------------------------------------------------------
\a\ The proper chemical name is 2,2'-bisoxy(1-chloropropane).
\b\ See Section 1.2.
\c\ These compounds are mixtures of various isomers (See Figures 2 through 12). Column conditions: Supelcoport (100/120 mesh) coated with 3% SP-2250
packed in a 1.8 m long x 2 mm ID glass column with helium carrier gas at 30 mL/min. flow rate. Column temperature held isothermal at 50 [deg]C for 4
min., then programmed at 8 [deg]C/min. to 270 [deg]C and held for 30 min.
Table 5--Chromatographic Conditions, Method Detection Limits, and Characteristic Masses for Acid Extractables
--------------------------------------------------------------------------------------------------------------------------------------------------------
Method Characteristic masses
Retention detection -------------------------------------------------------------
Parameter time limit Electron Impact Chemical ionization
(min) ([micro]g/ -------------------------------------------------------------
L) Primary Secondary Secondary Methane Methane Methane
--------------------------------------------------------------------------------------------------------------------------------------------------------
2-Chlorophenol..................................................... 5.9 3.3 128 64 130 129 131 157
2-Nitrophenol...................................................... 6.5 3.6 139 65 109 140 168 122
Phenol............................................................. 8.0 1.5 94 65 66 95 123 135
2,4-Dimethylphenol................................................. 9.4 2.7 122 107 121 123 151 163
2,4-Dichlorophenol................................................. 9.8 2.7 162 164 98 163 165 167
2,4,6-Trichlorophenol.............................................. 11.8 2.7 196 198 200 197 199 201
4-Chloro-3-methylphenol............................................ 13.2 3.0 142 107 144 143 171 183
2,4-Dinitrophenol.................................................. 15.9 42 184 63 154 185 213 225
2-Methyl-4,6-dinitrophenol......................................... 16.2 24 198 182 77 199 227 239
Pentachlorophenol.................................................. 17.5 3.6 266 264 268 267 265 269
[[Page 245]]
4-Nitrophenol...................................................... 20.3 2.4 65 139 109 140 168 122
--------------------------------------------------------------------------------------------------------------------------------------------------------
Column conditions: Supelcoport (100/120 mesh) coated with 1% SP-1240DA packed in a 1.8 m long x 2mm ID glass column with helium carrier gas at 30 mL/
min. flow rate. Column temperature held isothermal at 70 [deg]C for 2 min. then programmed at 8 [deg]C/min. to 200 [deg]C.
Table 6--QC Acceptance Criteria--Method 625
----------------------------------------------------------------------------------------------------------------
Test
conclusion Limits for Range for Range for
Parameter ([micro]g/ s ([micro]g/ X([micro]g/ P, Ps
L) L) L) (Percent)
----------------------------------------------------------------------------------------------------------------
Acenaphthene................................................ 100 27.6 60.1-132.3 47-145
Acenaphthylene.............................................. 100 40.2 53.5-126.0 33-145
Aldrin...................................................... 100 39.0 7.2-152.2 D-166
Anthracene.................................................. 100 32.0 43.4-118.0 27-133
Benzo(a)anthracene.......................................... 100 27.6 41.8-133.0 33-143
Benzo(b)fluoranthene........................................ 100 38.8 42.0-140.4 24-159
Benzo(k)fluoranthene........................................ 100 32.3 25.2-145.7 11-162
Benzo(a)pyrene.............................................. 100 39.0 31.7-148.0 17-163
Benzo(ghi)perylene.......................................... 100 58.9 D-195.0 D-219
Benzyl butyl phthalate...................................... 100 23.4 D-139.9 D-152
[beta]-BHC.................................................. 100 31.5 41.5-130.6 24-149
[delta]-BHC................................................. 100 21.6 D-100.0 D-110
Bis(2-chloroethyl) ether.................................... 100 55.0 42.9-126.0 12-158
Bis(2-chloroethoxy)methane.................................. 100 34.5 49.2-164.7 33-184
Bis(2-chloroisopropyl) ether \a\............................ 100 46.3 62.8-138.6 36-166
Bis(2-ethylhexyl) phthalate................................. 100 41.1 28.9-136.8 8-158
4-Bromophenyl phenyl ether.................................. 100 23.0 64.9-114.4 53-127
2-Chloronaphthalene......................................... 100 13.0 64.5-113.5 60-118
4-Chlorophenyl phenyl ether................................. 100 33.4 38.4-144.7 25-158
Chrysene.................................................... 100 48.3 44.1-139.9 17-168
4,4'-DDD.................................................... 100 31.0 D-134.5 D-145
4,4'-DDE.................................................... 100 32.0 19.2-119.7 4-136
4,4'-DDT.................................................... 100 61.6 D-170.6 D-203
Dibenzo(a,h)anthracene...................................... 100 70.0 D-199.7 D-227
Di-n-butyl phthalate........................................ 100 16.7 8.4-111.0 1-118
1,2-Dichlorobenzene......................................... 100 30.9 48.6-112.0 32-129
1,3-Dichlorobenzene......................................... 100 41.7 16.7-153.9 D-172
1,4,-Dichlorobenzene........................................ 100 32.1 37.3-105.7 20-124
3,3'-Dhlorobenzidine........................................ 100 71.4 8.2-212.5 D-262
Dieldrin.................................................... 100 30.7 44.3-119.3 29-136
Diethyl phthalate........................................... 100 26.5 D-100.0 D-114
Dimethyl phthalate.......................................... 100 23.2 D-100.0 D-112
2,4-Dinitrotoluene.......................................... 100 21.8 47.5-126.9 39-139
2,6-Dinitrotoluene.......................................... 100 29.6 68.1-136.7 50-158
Di-n-octyl phthalate........................................ 100 31.4 18.6-131.8 4-146
Endosulfan sulfate.......................................... 100 16.7 D-103.5 D-107
Endrin aldehyde............................................. 100 32.5 D-188.8 D-209
Fluoranthene................................................ 100 32.8 42.9-121.3 26-137
Fluorene.................................................... 100 20.7 71.6-108.4 59-121
Heptachlor.................................................. 100 37.2 D-172.2 D-192
Heptachlor epoxide.......................................... 100 54.7 70.9-109.4 26-155
Hexachlorobenzene........................................... 100 24.9 7.8-141.5 D-152
Hexachlorobutadiene......................................... 100 26.3 37.8-102.2 24-116
Hexachloroethane............................................ 100 24.5 55.2-100.0 40-113
Indeno(1,2,3-cd)pyrene...................................... 100 44.6 D-150.9 D-171
Isophorone.................................................. 100 63.3 46.6-180.2 21-196
Naphthalene................................................. 100 30.1 35.6-119.6 21-133
Nitrobenzene................................................ 100 39.3 54.3-157.6 35-180
N-Nitrosodi-n-propylamine................................... 100 55.4 13.6-197.9 D-230
PCB-1260.................................................... 100 54.2 19.3-121.0 D-164
Phenanthrene................................................ 100 20.6 65.2-108.7 54-120
Pyrene...................................................... 100 25.2 69.6-100.0 52-115
1,2,4-Trichlorobenzene...................................... 100 28.1 57.3-129.2 44-142
4-Chloro-3-methylphenol..................................... 100 37.2 40.8-127.9 22-147
2-Chlorophenol.............................................. 100 28.7 36.2-120.4 23-134
[[Page 246]]
2,4-Dichlorophenol.......................................... 100 26.4 52.5-121.7 39-135
2,4-Dimethylphenol.......................................... 100 26.1 41.8-109.0 32-119
2,4-Dinitrophenol........................................... 100 49.8 D-172.9 D-191
2-Methyl-4,6-dinitrophenol.................................. 100 93.2 53.0-100.0 D-181
2-Nitrophenol............................................... 100 35.2 45.0-166.7 29-182
4-Nitrophenol............................................... 100 47.2 13.0-106.5 D-132
Pentachlorophenol........................................... 100 48.9 38.1-151.8 14-176
Phenol...................................................... 100 22.6 16.6-100.0 5-112
2,4,6-Trichlorophenol....................................... 100 31.7 52.4-129.2 37-144
----------------------------------------------------------------------------------------------------------------
s=Standard deviation for four recovery measurements, in [micro]g/L (Section 8.2.4).
X=Average recovery for four recovery measurements, in [micro]g/L (Section 8.2.4).
P, Ps=Percent recovery measured (Section 8.3.2, Section 8.4.2).
D=Detected; result must be greater than zero.
Note: These criteria are based directly upon the method performance data in Table 7. Where necessary, the limits
for recovery have been broadened to assure applicability of the limts to concentrations below those used to
develop Table 7.
\a\ The proper chemical name is 2,2'oxybis(1-chloropropane).
Table 7--Method Accuracy and Precision as Functions of Concentration--Method 625
----------------------------------------------------------------------------------------------------------------
Accuracy, as Single analyst Overall
Parameter recovery, X' precision, sr' precision, S'
([micro]g/L) ([micro]g/L) ([micro]g/L)
----------------------------------------------------------------------------------------------------------------
Acenaphthene.................................................... 0.96C=0.19 0.15X-0.12 0.21X-0.67
Acenaphthylene.................................................. 0.89C=0.74 0.24X-1.06 0.26X-0.54
Aldrin.......................................................... 0.78C=1.66 0.27X-1.28 0.43X=1.13
Anthracene...................................................... 0.80C=0.68 0.21X-0.32 0.27X-0.64
Benzo(a)anthracene.............................................. 0.88C-0.60 0.15X=0.93 0.26X-0.28
Benzo(b)fluoranthene............................................ 0.93C-1.80 0.22X=0.43 0.29X=0.96
Benzo(k)fluoranthene............................................ 0.87C-1.56 0.19X=1.03 0.35X=0.40
Benzo(a)pyrene.................................................. 0.90C-0.13 0.22X=0.48 0.32X=1.35
Benzo(ghi)perylene.............................................. 0.98C-0.86 0.29X=2.40 0.51X-0.44
Benzyl butyl phthalate.......................................... 0.66C-1.68 0.18X=0.94 0.53X=0.92
[beta]-BHC...................................................... 0.87C-0.94 0.20X-0.58 0.30X-1.94
[delta]-BHC..................................................... 0.29C-1.09 0.34X=0.86 0.93X-0.17
Bis(2-chloroethyl) ether........................................ 0.86C-1.54 0.35X-0.99 0.35X=0.10
Bis(2-chloroethoxy)methane...................................... 1.12C-5.04 0.16X=1.34 0.26X=2.01
Bis(2-chloroisopropyl) ether \a\................................ 1.03C-2.31 0.24X=0.28 0.25X=1.04
Bis(2-ethylhexyl) phthalate..................................... 0.84C-1.18 0.26X=0.73 0.36X=0.67
4-Bromophenyl phenyl ether...................................... 0.91C-1.34 0.13X=0.66 0.16X=0.66
2-Chloronaphthalene............................................. 0.89C=0.01 0.07X=0.52 0.13X=0.34
4-Chlorophenyl phenyl ether..................................... 0.91C=0.53 0.20X-0.94 0.30X-0.46
Chrysene........................................................ 0.93C-1.00 0.28X=0.13 0.33X-0.09
4,4'-DDD........................................................ 0.56C-0.40 0.29X-0.32 0.66X-0.96
4,4'-DDE........................................................ 0.70C-0.54 0.26X-1.17 0.39X-1.04
4,4'-DDT........................................................ 0.79C-3.28 0.42X=0.19 0.65X-0.58
Dibenzo(a,h)anthracene.......................................... 0.88C=4.72 0.30X=8.51 0.59X=0.25
Di-n-butyl phthalate............................................ 0.59C=0.71 0.13X=1.16 0.39X=0.60
1,2-Dichlorobenzene............................................. 0.80C=0.28 0.20X=0.47 0.24X=0.39
1,3-Dichlorobenzene............................................. 0.86C-0.70 0.25X=0.68 0.41X=0.11
1,4-Dichlorobenzene............................................. 0.73C-1.47 0.24X=0.23 0.29X=0.36
3,3'-Dichlorobenzidine.......................................... 1.23C-12.65 0.28X=7.33 0.47X=3.45
Dieldrin........................................................ 0.82C-0.16 0.20X-0.16 0.26X-0.07
Diethyl phthalate............................................... 0.43C=1.00 0.28X=1.44 0.52X=0.22
Dimethyl phthalate.............................................. 0.20C=1.03 0.54X=0.19 1.05X-0.92
2,4-Dinitrotoluene.............................................. 0.92C-4.81 0.12X=1.06 0.21X=1.50
2,6-Dinitrotoluene.............................................. 1.06C-3.60 0.14X=1.26 0.19X=0.35
Di-n-octyl phthalate............................................ 0.76C-0.79 0.21X=1.19 0.37X=1.19
Endosulfan sulfate.............................................. 0.39C=0.41 0.12X=2.47 0.63X-1.03
Endrin aldehyde................................................. 0.76C-3.86 0.18X=3.91 0.73X-0.62
Fluoranthene.................................................... 0.81C=1.10 0.22X-0.73 0.28X-0.60
Fluorene........................................................ 0.90C-0.00 0.12X=0.26 0.13X=0.61
Heptachlor...................................................... 0.87C-2.97 0.24X-0.56 0.50X-0.23
Heptachlor epoxide.............................................. 0.92C-1.87 0.33X-0.46 0.28X=0.64
Hexachlorobenzene............................................... 0.74C=0.66 0.18X-0.10 0.43X-0.52
Hexachlorobutadiene............................................. 0.71C-1.01 0.19X=0.92 0.26X=0.49
Hexachloroethane................................................ 0.73C-0.83 0.17X=0.67 0.17X=0.80
Indeno(1,2,3-cd)pyrene.......................................... 0.78C-3.10 0.29X=1.46 0.50X=0.44
Isophorone...................................................... 1.12C=1.41 0.27X=0.77 0.33X=0.26
Naphthalene..................................................... 0.76C=1.58 0.21X-0.41 0.30X-0.68
[[Page 247]]
Nitrobenzene.................................................... 1.09C-3.05 0.19X=0.92 0.27X=0.21
N-Nitrosodi-n-propylamine....................................... 1.12C-6.22 0.27X=0.68 0.44X=0.47
PCB-1260........................................................ 0.81C-10.86 0.35X=3.61 0.43X=1.82
Phenanthrene.................................................... 0.87C-0.06 0.12X=0.57 0.15X=0.25
Pyrene.......................................................... 0.84C-0.16 0.16X=0.06 0.15X=0.31
1,2,4-Trichlorobenzene.......................................... 0.94C-0.79 0.15X=0.85 0.21X=0.39
4-Chloro-3-methylphenol......................................... 0.84C=0.35 0.23X=0.75 0.29X=1.31
2-Chlorophenol.................................................. 0.78C=0.29 0.18X=1.46 0.28X=0.97
2,4-Dichlorophenol.............................................. 0.87C=0.13 0.15X=1.25 0.21X=1.28
2,4-Dimethylphenol.............................................. 0.71C=4.41 0.16X=1.21 0.22X=1.31
2,4-Dinitrophenol............................................... 0.81C-18.04 0.38X=2.36 0.42X=26.29
2-Methyl-4,6-Dinitrophenol...................................... 1.04C-28.04 0.05X=42.29 0.26X=23.10
2-Nitrophenol................................................... 1.07C-1.15 0.16X=1.94 0.27X=2.60
4-Nitrophenol................................................... 0.61C-1.22 0.38X=2.57 0.44X=3.24
Pentachlorophenol............................................... 0.93C=1.99 0.24X=3.03 0.30X=4.33
Phenol.......................................................... 0.43C=1.26 0.26X=0.73 0.35X=0.58
2,4,6-Trichlorophenol........................................... 0.91C-0.18 0.16X=2.22 0.22X=1.81
----------------------------------------------------------------------------------------------------------------
X'=Expected recovery for one or more measurements of a sample containing a concentration of C, in [micro]g/L.
sr'=Expected single analyst standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
S'= Expected interlaboratory standard deviation of measurements at an average concentration found of X, in
[micro]g/L.
C= True value for the concentration, in [micro]g/L.
X= Average recovery found for measurements of samples containing a concentration of C, in [micro]g/L.
\a\ The proper chemical name is 2,2'oxybis(1-chloropropane).
Table 8--Suggested Internal and Surrogate Standards
------------------------------------------------------------------------
Base/neutral fraction Acid fraction
------------------------------------------------------------------------
Aniline-d5................................ 2-Fluorophenol.
Anthracene-d10............................ Pentafluorophenol.
Benzo(a)anthracene-d12.................... Phenol-d5
4,4'-Dibromobiphenyl...................... 2-Perfluoromethyl phenol.
4,4'-Dibromooctafluorobiphenyl............
Decafluorobiphenyl........................
2,2 \1\-Difluorobiphenyl.................. ............................
4-Fluoroaniline........................... ............................
1-Fluoronaphthalene....................... ............................
2-Fluoronaphthalene....................... ............................
Naphthalene-d8............................ ............................
Nitrobenzene-d5........................... ............................
2,3,4,5,6-Pentafluorobiphenyl............. ............................
Phenanthrene-d10.......................... ............................
Pyridine-d5............................... ............................
------------------------------------------------------------------------
Table 9--DFTPP Key Masses and Abundance Criteria
------------------------------------------------------------------------
Mass m/z Abundance criteria
------------------------------------------------------------------------
51 30-60 percent of mass 198.
68 Less than 2 percent of mass 69.
70 Less than 2 percent of mass 69.
127 40-60 percent of mass 198.
197 Less than 1 percent of mass 198.
198 Base peak, 100 percent relative abundance.
199 5-9 percent of mass 198.
275 10-30 percent of mass 198.
365 Greater than 1 percent of mass 198.
441 Present but less than mass 443.
442 Greater than 40 percent of mass 198.
443 17-23 percent of mass 442.
------------------------------------------------------------------------
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Attachment 1 to Method 625
Introduction
To support measurement of several semivolatile pollutants, EPA has
developed this attachment to EPA Method 625. \1\ The modifications
listed in this attachment are approved only for monitoring wastestreams
from the Centralized Waste Treatment Point Source Category (40 CFR part
437) and the Landfills Point Source Category (40 CFR part 445). EPA
Method 625 (the Method) involves sample extraction with methylene
chloride followed by analysis of the extract using either packed or
capillary column gas chromatography/mass spectrometry (GC/MS). This
attachment addresses the addition of the semivolatile pollutants listed
in Tables 1 and 2, to all applicable standard, stock, and spiking
solutions utilized for the determination of semivolatile organic
compounds by EPA Method 625.
---------------------------------------------------------------------------
\1\ EPA Method 625: Base/Neutrals and Acids, 40 CFR part 136,
appendix A.
---------------------------------------------------------------------------
1.0 EPA METHOD 625 MODIFICATION SUMMARY
The additional semivolatile organic compounds listed in Tables 1 and
2 are added to all applicable calibration, spiking, and other solutions
utilized in the determination of base/neutral and acid compounds by EPA
Method 625. The instrument is to be calibrated with these compounds,
using a capillary column, and all procedures and quality control tests
stated in the Method must be performed.
2.0 SECTION MODIFICATIONS
Note: All section and figure numbers in this Attachment reference
section and figure numbers in EPA Method 625 unless noted otherwise.
Sections not listed here remain unchanged.
Section 6.7 The stock standard solutions described in this section are
modified such that the analytes in Tables 1 and 2 of this
attachment are required in addition to those specified in the
Method.
Section 7.2 The calibration standards described in this section are
modified to include the analytes in Tables 1 and 2 of this
attachment.
Section 8.2 The precision and accuracy requirements are modified to
include the analytes listed in Tables 1 and 2 of this
attachment. Additional performance criteria are supplied in
Table 5 of this attachment.
Section 8.3 The matrix spike is modified to include the analytes listed
in Tables 1 and 2 of this attachment.
Section 8.4 The QC check standard is modified to include the analytes
listed in Tables 1 and 2 of this attachment. Additional
performance criteria are supplied in Table 5 of this
attachment.
Section 16.0 Additional method performance information is supplied with
this attachment.
Table 1--Base/Neutral Extractables
------------------------------------------------------------------------
Parameter CAS No.
------------------------------------------------------------------------
acetophenone \1\........................................... 98-86-2
alpha-terpineol \3\........................................ 98-55-5
aniline \2\................................................ 62-53-3
carbazole \1\.............................................. 86-74-8
o-cresol \1\............................................... 95-48-7
n-decane \1\............................................... 124-18-5
2,3-dichloroaniline \1\.................................... 608-27-5
n-octadecane \1\........................................... 593-45-3
pyridine \2\............................................... 110-86-1
------------------------------------------------------------------------
CAS = Chemical Abstracts Registry.
\1\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment industry.
\2\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
\3\ Analysis of this pollutant is approved only for the Landfills
industry.
Table 2--Acid Extractables
------------------------------------------------------------------------
Parameter CAS No.
------------------------------------------------------------------------
p-cresol \1\............................................... 106-44-5
------------------------------------------------------------------------
CAS = Chemical Abstracts Registry.
\1\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
Table 3--Chromatographic Conditions, \1\ Method Detection Limits (MDLs), and Characteristic m/z's for Base/
Neutral Extractables
----------------------------------------------------------------------------------------------------------------
Characteristic m/z's
Retention MDL --------------------------------------
Analyte time (min) ([micro]g/ Electron impact
\2\ L) --------------------------------------
Primary Secondary Secondary
----------------------------------------------------------------------------------------------------------------
pyridine \3\................................... 4.93 4.6 79 52 51
N-Nitro sodimethylamine........................ 4.95 ........... 42 74 44
aniline \3\.................................... 10.82 3.3 93 66 65
Bis(2-chloroethyl)ether........................ 10.94 ........... 93 63 95
n-decane \4\................................... 11.11 5.0 57 ........... ...........
1,3-Dichlorobenzene............................ 11.47 ........... 146 148 113
1,4-Dichlorobenzene............................ 11.62 ........... 146 148 113
1,2-Dichlorobenzene............................ 12.17 ........... 146 148 113
[[Page 261]]
o-creso \1\.................................... 12.48 4.7 108 107 79
Bis(2-chloro- isopropyl)ether.................. 12.51 ........... 45 77 79
acetophenone \4\............................... 12.88 3.4 105 77 51
N-Nitrosodi-n-propylamine...................... 12.97 ........... 130 42 101
Hexachloroethane............................... 13.08 ........... 117 201 199
Nitrobenzene................................... 13.40 ........... 77 123 65
Isophorone..................................... 14.11 ........... 82 95 138
Bis (2-chloro ethoxy)methane................... 14.82 ........... 93 95 123
1,2,4-Trichlorobenzene......................... 15.37 ........... 180 182 145
alpha-terpineol................................ 15.55 5.0 59 ........... ...........
Naphthalene.................................... 15.56 ........... 128 129 127
Hexachlorobutadiene............................ 16.12 ........... 225 223 227
Hexachlorocyclopentadiene...................... 18.47 ........... 237 235 272
2,3-dichloroaniline \4\........................ 18.82 2.5 161 163 90
2-Chloronaphthalene............................ 19.35 ........... 162 164 127
Dimethyl phthalate............................. 20.48 ........... 163 194 164
Acenaphthylene................................. 20.69 ........... 152 151 153
2,6-Dinitrotoluene............................. 20.73 ........... 165 89 121
Acenaphthene................................... 21.30 ........... 154 153 152
2,4-Dinitrotoluene............................. 22.00 ........... 165 63 182
Diethylphthalate............................... 22.74 ........... 149 177 150
4-Chlorophenyl phenyl ether.................... 22.90 ........... 204 206 141
Fluorene....................................... 22.92 ........... 166 165 167
N-Nitro sodiphenylamine........................ 23.35 ........... 169 168 167
4-Bromophenyl phenyl ether..................... 24.44 ........... 248 250 141
Hexachlorobenzene.............................. 24.93 ........... 284 142 249
n-octadecane \4\............................... 25.39 2.0 57 ........... ...........
Phenanthrene................................... 25.98 ........... 178 179 176
Anthracene..................................... 26.12 ........... 178 179 176
Carbazole \4\.................................. 26.66 4.0 167 ........... ...........
Dibutyl phthalate.............................. 27.84 ........... 149 150 104
Fluoranthene................................... 29.82 ........... 202 101 100
Benzidine...................................... 30.26 ........... 184 92 185
Pyrene......................................... 30.56 ........... 202 101 100
Butyl benzyl phthalate......................... 32.63 ........... 149 91 206
3,3'-Dichlorobenzidine......................... 34.28 ........... 252 254 126
Benzo(a)anthracene............................. 34.33 ........... 228 229 226
Bis(2-ethyl hexyl)phthalate.................... 34.36 ........... 149 167 279
Chrysene....................................... 34.44 ........... 228 226 229
Di-n-octyl-phthalate........................... 36.17 ........... 149 ........... ...........
Benzo(b)fluoranthene........................... 37.90 ........... 252 253 125
Benzo(k)fluoranthene........................... 37.97 ........... 252 253 125
Benzo(a)pyrene................................. 39.17 ........... 252 253 125
Dibenzo(a,h) anthracene........................ 44.91 ........... 278 139 279
Indeno(1,2,3-c,d)pyrene........................ 45.01 ........... 276 138 277
Benzo(ghi)perylene............................. 46.56 ........... 276 138 277
----------------------------------------------------------------------------------------------------------------
\1\ The data presented in this table were obtained under the following conditions:
Column--30 5 meters x 0.25 .02 mm i.d., 94% methyl, 5% phenyl, 1%
vinyl, bonded phase fused silica capillary column (DB-5).
Temperature program--Five minutes at 30 [deg]C; 30-280 [deg]C at 8 [deg]C per minute; isothermal at 280 [deg]C
until benzo(ghi)perylene elutes.
Gas velocity--30 5 cm/sec at 30 [deg]C.
\2\ Retention times are from Method 1625, Revision C, using a capillary column, and are intended to be
consistent for all analytes in Tables 4 and 5 of this attachment.
\3\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
\4\ Analysis of this pollutant is approved only for the Centralized Waste Treatment industry.
Table 4--Chromatographic Conditions, \1\ Method Detection Limits (MDLs), and Characteristic m/z's for Acid
Extractables
----------------------------------------------------------------------------------------------------------------
Characteristic m/z's
Retention MDL --------------------------------------
Analyte time \2\ ([micro]g/ Electron impact
(min) L) --------------------------------------
Primary Secondary Secondary
----------------------------------------------------------------------------------------------------------------
Phenol......................................... 10.76 ........... 94 65 66
2-Chlorophenol................................. 11.08 ........... 128 64 130
[[Page 262]]
p-cresol \3\................................... 12.92 7.8 108 107 77
2-Nitrophenol.................................. 14.38 ........... 139 65 109
2,4-Dimethylphenol............................. 14.54 ........... 122 107 121
2,4-Dichlorophenol............................. 15.12 ........... 162 164 98
4-Chloro-3-methylphenol........................ 16.83 ........... 142 107 144
2,4,6-Trichlorophenol.......................... 18.80 ........... 196 198 200
2,4-Dinitrophenol.............................. 21.51 ........... 184 63 154
4-Nitrophenol.................................. 21.77 ........... 65 139 109
2-Methyl-4,6-dinitrophenol..................... 22.83 ........... 198 182 77
Pentachlorophenol.............................. 25.52 ........... 266 264 268
----------------------------------------------------------------------------------------------------------------
\1\ The data presented in this table were obtained under the following conditions:
Column--30 5 meters x 0.25 .02 mm i.d., 94% methyl, 5% phenyl, 1%
vinyl silicone bonded phase fused silica capillary column (DB-5).
Temperature program--Five minutes at 30 [deg]C; 30-280 [deg]C at 8 [deg]C per minute; isothermal at 280 [deg]C
until benzo(ghi)perylene elutes.
Gas velocity--30 5 cm/sec at 30 [deg]C
\2\ Retention times are from EPA Method 1625, Revision C, using a capillary column, and are intended to be
consistent for all analytes in Tables 3 and 4 of this attachment.
\3\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
Table 5--QC Acceptance Criteria
----------------------------------------------------------------------------------------------------------------
Test Limits for
conclusion s Range for X Range for
Analyte ([micro]g/ ([micro]g/ ([micro]g/ P, Ps(%)
L) L) L)
----------------------------------------------------------------------------------------------------------------
acetophenone \1\............................................ 100 51 23-254 61-144
alpha-terpineol............................................. 100 47 46-163 58-156
aniline \2\................................................. 100 71 15-278 46-134
carbazole \1\............................................... 100 17 79-111 73-131
o-cresol \1\................................................ 100 23 30-146 55-126
p-cresol \2\................................................ 100 22 11-617 76-107
n-decane \1\................................................ 100 70 D-651 D-ns
2,3-dichloroaniline \1\..................................... 100 13 40-160 68-134
n-octadecane \1\............................................ 100 10 52-147 65-123
pyridine \2\................................................ 100 ns 7-392 33-158
----------------------------------------------------------------------------------------------------------------
s = Standard deviation for four recovery measurements, in [micro]g/L (Section 8.2)
X = Average recovery for four recovery measurements in [micro]g/L (Section 8.2)
P,Ps = Percent recovery measured (Section 8.3, Section 8.4)
D = Detected; result must be greater than zero.
ns = no specification; limit is outside the range that can be measured reliably.
\1\ Analysis of this pollutant is approved only for the Centralized Waste Treatment industry.
\2\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
Method 1613, Revision B
Tetra- Through Octa-Chlorinated Dioxins and Furans by Isotope Dilution
HRGC/HRMS
1.0 Scope and Application
1.1 This method is for determination of tetra- through octa-
chlorinated dibenzo-p-dioxins (CDDs) and dibenzofurans (CDFs) in water,
soil, sediment, sludge, tissue, and other sample matrices by high
resolution gas chromatography/high resolution mass spectrometry (HRGC/
HRMS). The method is for use in EPA's data gathering and monitoring
programs associated with the Clean Water Act, the Resource Conservation
and Recovery Act, the Comprehensive Environmental Response, Compensation
and Liability Act, and the Safe Drinking Water Act. The method is based
on a compilation of EPA, industry, commercial laboratory, and academic
methods (References 1-6).
1.2 The seventeen 2,3,7,8-substituted CDDs/CDFs listed in Table 1
may be determined by this method. Specifications are also provided for
separate determination of 2,3,7,8-tetrachloro-dibenzo-p-dioxin (2,3,7,8-
TCDD) and 2,3,7,8-tetrachloro-dibenzofuran (2,3,7,8-TCDF).
1.3 The detection limits and quantitation levels in this method are
usually dependent on the level of interferences rather than instrumental
limitations. The minimum levels (MLs) in Table 2 are the levels at which
the CDDs/CDFs can be determined with no interferences present. The
Method Detection
[[Page 263]]
Limit (MDL) for 2,3,7,8-TCDD has been determined as 4.4 pg/L (parts-per-
quadrillion) using this method.
1.4 The GC/MS portions of this method are for use only by analysts
experienced with HRGC/HRMS or under the close supervision of such
qualified persons. Each laboratory that uses this method must
demonstrate the ability to generate acceptable results using the
procedure in Section 9.2.
1.5 This method is ``performance-based''. The analyst is permitted
to modify the method to overcome interferences or lower the cost of
measurements, provided that all performance criteria in this method are
met. The requirements for establishing method equivalency are given in
Section 9.1.2.
1.6 Any modification of this method, beyond those expressly
permitted, shall be considered a major modification subject to
application and approval of alternate test procedures under 40 CFR 136.4
and 136.5.
2.0 Summary of Method
Flow charts that summarize procedures for sample preparation,
extraction, and analysis are given in Figure 1 for aqueous and solid
samples, Figure 2 for multi-phase samples, and Figure 3 for tissue
samples.
2.1 Extraction.
2.1.1 Aqueous samples (samples containing less than 1% solids)--
Stable isotopically labeled analogs of 15 of the 2,3,7,8-substituted
CDDs/CDFs are spiked into a 1 L sample, and the sample is extracted by
one of three procedures:
2.1.1.1 Samples containing no visible particles are extracted with
methylene chloride in a separatory funnel or by the solid-phase
extraction technique summarized in Section 2.1.1.3. The extract is
concentrated for cleanup.
2.1.1.2 Samples containing visible particles are vacuum filtered
through a glass-fiber filter. The filter is extracted in a Soxhlet/Dean-
Stark (SDS) extractor (Reference 7), and the filtrate is extracted with
methylene chloride in a separatory funnel. The methylene chloride
extract is concentrated and combined with the SDS extract prior to
cleanup.
2.1.1.3 The sample is vacuum filtered through a glass-fiber filter
on top of a solid-phase extraction (SPE) disk. The filter and disk are
extracted in an SDS extractor, and the extract is concentrated for
cleanup.
2.1.2 Solid, semi-solid, and multi-phase samples (but not tissue)--
The labeled compounds are spiked into a sample containing 10 g (dry
weight) of solids. Samples containing multiple phases are pressure
filtered and any aqueous liquid is discarded. Coarse solids are ground
or homogenized. Any non-aqueous liquid from multi-phase samples is
combined with the solids and extracted in an SDS extractor. The extract
is concentrated for cleanup.
2.1.3 Fish and other tissue--The sample is extracted by one of two
procedures:
2.1.3.1 Soxhlet or SDS extraction--A 20 g aliquot of sample is
homogenized, and a 10 g aliquot is spiked with the labeled compounds.
The sample is mixed with sodium sulfate, allowed to dry for 12-24 hours,
and extracted for 18-24 hours using methylene chloride:hexane (1:1) in a
Soxhlet extractor. The extract is evaporated to dryness, and the lipid
content is determined.
2.1.3.2 HCl digestion--A 20 g aliquot is homogenized, and a 10 g
aliquot is placed in a bottle and spiked with the labeled compounds.
After equilibration, 200 mL of hydrochloric acid and 200 mL of methylene
chloride:hexane (1:1) are added, and the bottle is agitated for 12-24
hours. The extract is evaporated to dryness, and the lipid content is
determined.
2.2 After extraction, \37\Cl4-labeled 2,3,7,8-TCDD is
added to each extract to measure the efficiency of the cleanup process.
Sample cleanups may include back-extraction with acid and/or base, and
gel permeation, alumina, silica gel, Florisil and activated carbon
chromatography. High-performance liquid chromatography (HPLC) can be
used for further isolation of the 2,3,7,8-isomers or other specific
isomers or congeners. Prior to the cleanup procedures cited above,
tissue extracts are cleaned up using an anthropogenic isolation column,
a batch silica gel adsorption, or sulfuric acid and base back-
extraction, depending on the tissue extraction procedure used.
2.3 After cleanup, the extract is concentrated to near dryness.
Immediately prior to injection, internal standards are added to each
extract, and an aliquot of the extract is injected into the gas
chromatograph. The analytes are separated by the GC and detected by a
high-resolution (=10,000) mass spectrometer. Two exact m/z's
are monitored for each analyte.
2.4 An individual CDD/CDF is identified by comparing the GC
retention time and ion-abundance ratio of two exact m/z's with the
corresponding retention time of an authentic standard and the
theoretical or acquired ion-abundance ratio of the two exact m/z's. The
non-2,3,7,8 substituted isomers and congeners are identified when
retention times and ion-abundance ratios agree within predefined limits.
Isomer specificity for 2,3,7,8-TCDD and 2,3,7,8-TCDF is achieved using
GC columns that resolve these isomers from the other tetra-isomers.
2.5 Quantitative analysis is performed using selected ion current
profile (SICP) areas, in one of three ways:
2.5.1 For the 15 2,3,7,8-substituted CDDs/CDFs with labeled analogs
(see Table 1), the GC/MS system is calibrated, and the concentration of
each compound is determined using the isotope dilution technique.
[[Page 264]]
2.5.2 For 1,2,3,7,8,9-HxCDD, OCDF, and the labeled compounds, the
GC/MS system is calibrated and the concentration of each compound is
determined using the internal standard technique.
2.5.3 For non-2,3,7,8-substituted isomers and for all isomers at a
given level of chlorination (i.e., total TCDD), concentrations are
determined using response factors from calibration of the CDDs/CDFs at
the same level of chlorination.
2.6 The quality of the analysis is assured through reproducible
calibration and testing of the extraction, cleanup, and GC/MS systems.
3.0 Definitions
Definitions are given in the glossary at the end of this method.
4.0 Contamination and Interferences
4.1 Solvents, reagents, glassware, and other sample processing
hardware may yield artifacts and/or elevated baselines causing
misinterpretation of chromatograms (References 8-9). Specific selection
of reagents and purification of solvents by distillation in all-glass
systems may be required. Where possible, reagents are cleaned by
extraction or solvent rinse.
4.2 Proper cleaning of glassware is extremely important, because
glassware may not only contaminate the samples but may also remove the
analytes of interest by adsorption on the glass surface.
4.2.1 Glassware should be rinsed with solvent and washed with a
detergent solution as soon after use as is practical. Sonication of
glassware containing a detergent solution for approximately 30 seconds
may aid in cleaning. Glassware with removable parts, particularly
separatory funnels with fluoropolymer stopcocks, must be disassembled
prior to detergent washing.
4.2.2 After detergent washing, glassware should be rinsed
immediately, first with methanol, then with hot tap water. The tap water
rinse is followed by another methanol rinse, then acetone, and then
methylene chloride.
4.2.3 Do not bake reusable glassware in an oven as a routine part of
cleaning. Baking may be warranted after particularly dirty samples are
encountered but should be minimized, as repeated baking of glassware may
cause active sites on the glass surface that will irreversibly adsorb
CDDs/CDFs.
4.2.4 Immediately prior to use, the Soxhlet apparatus should be pre-
extracted with toluene for approximately three hours (see Sections
12.3.1 through 12.3.3). Separatory funnels should be shaken with
methylene chloride/toluene (80/20 mixture) for two minutes, drained, and
then shaken with pure methylene chloride for two minutes.
4.3 All materials used in the analysis shall be demonstrated to be
free from interferences by running reference matrix method blanks
initially and with each sample batch (samples started through the
extraction process on a given 12-hour shift, to a maximum of 20
samples).
4.3.1 The reference matrix must simulate, as closely as possible,
the sample matrix under test. Ideally, the reference matrix should not
contain the CDDs/CDFs in detectable amounts, but should contain
potential interferents in the concentrations expected to be found in the
samples to be analyzed. For example, a reference sample of human adipose
tissue containing pentachloronaphthalene can be used to exercise the
cleanup systems when samples containing pentachloronaphthalene are
expected.
4.3.2 When a reference matrix that simulates the sample matrix under
test is not available, reagent water (Section 7.6.1) can be used to
simulate water samples; playground sand (Section 7.6.2) or white quartz
sand (Section 7.3.2) can be used to simulate soils; filter paper
(Section 7.6.3) can be used to simulate papers and similar materials;
and corn oil (Section 7.6.4) can be used to simulate tissues.
4.4 Interferences coextracted from samples will vary considerably
from source to source, depending on the diversity of the site being
sampled. Interfering compounds may be present at concentrations several
orders of magnitude higher than the CDDs/CDFs. The most frequently
encountered interferences are chlorinated biphenyls, methoxy biphenyls,
hydroxydiphenyl ethers, benzylphenyl ethers, polynuclear aromatics, and
pesticides. Because very low levels of CDDs/CDFs are measured by this
method, the elimination of interferences is essential. The cleanup steps
given in Section 13 can be used to reduce or eliminate these
interferences and thereby permit reliable determination of the CDDs/CDFs
at the levels shown in Table 2.
4.5 Each piece of reusable glassware should be numbered to associate
that glassware with the processing of a particular sample. This will
assist the laboratory in tracking possible sources of contamination for
individual samples, identifying glassware associated with highly
contaminated samples that may require extra cleaning, and determining
when glassware should be discarded.
4.6 Cleanup of tissue--The natural lipid content of tissue can
interfere in the analysis of tissue samples for the CDDs/CDFs. The lipid
contents of different species and portions of tissue can vary widely.
Lipids are soluble to varying degrees in various organic solvents and
may be present in sufficient quantity to overwhelm the column
chromatographic cleanup procedures used for cleanup of sample extracts.
Lipids must
[[Page 265]]
be removed by the lipid removal procedures in Section 13.7, followed by
alumina (Section 13.4) or Florisil (Section 13.8), and carbon (Section
13.5) as minimum additional cleanup steps. If chlorodiphenyl ethers are
detected, as indicated by the presence of peaks at the exact m/z's
monitored for these interferents, alumina and/or Florisil cleanup must
be employed to eliminate these interferences.
5.0 Safety
5.1 The toxicity or carcinogenicity of each compound or reagent used
in this method has not been precisely determined; however, each chemical
compound should be treated as a potential health hazard. Exposure to
these compounds should be reduced to the lowest possible level.
5.1.1 The 2,3,7,8-TCDD isomer has been found to be acnegenic,
carcinogenic, and teratogenic in laboratory animal studies. It is
soluble in water to approximately 200 ppt and in organic solvents to
0.14%. On the basis of the available toxicological and physical
properties of 2,3,7,8-TCDD, all of the CDDs/CDFs should be handled only
by highly trained personnel thoroughly familiar with handling and
cautionary procedures and the associated risks.
5.1.2 It is recommended that the laboratory purchase dilute standard
solutions of the analytes in this method. However, if primary solutions
are prepared, they shall be prepared in a hood, and a NIOSH/MESA
approved toxic gas respirator shall be worn when high concentrations are
handled.
5.2 The laboratory is responsible for maintaining a current
awareness file of OSHA regulations regarding the safe handling of the
chemicals specified in this method. A reference file of material safety
data sheets (MSDSs) should also be made available to all personnel
involved in these analyses. It is also suggested that the laboratory
perform personal hygiene monitoring of each analyst who uses this method
and that the results of this monitoring be made available to the
analyst. Additional information on laboratory safety can be found in
References 10-13. The references and bibliography at the end of
Reference 13 are particularly comprehensive in dealing with the general
subject of laboratory safety.
5.3 The CDDs/CDFs and samples suspected to contain these compounds
are handled using essentially the same techniques employed in handling
radioactive or infectious materials. Well-ventilated, controlled access
laboratories are required. Assistance in evaluating the health hazards
of particular laboratory conditions may be obtained from certain
consulting laboratories and from State Departments of Health or Labor,
many of which have an industrial health service. The CDDs/CDFs are
extremely toxic to laboratory animals. Each laboratory must develop a
strict safety program for handling these compounds. The practices in
References 2 and 14 are highly recommended.
5.3.1 Facility--When finely divided samples (dusts, soils, dry
chemicals) are handled, all operations (including removal of samples
from sample containers, weighing, transferring, and mixing) should be
performed in a glove box demonstrated to be leak tight or in a fume hood
demonstrated to have adequate air flow. Gross losses to the laboratory
ventilation system must not be allowed. Handling of the dilute solutions
normally used in analytical and animal work presents no inhalation
hazards except in the case of an accident.
5.3.2 Protective equipment--Disposable plastic gloves, apron or lab
coat, safety glasses or mask, and a glove box or fume hood adequate for
radioactive work should be used. During analytical operations that may
give rise to aerosols or dusts, personnel should wear respirators
equipped with activated carbon filters. Eye protection equipment
(preferably full face shields) must be worn while working with exposed
samples or pure analytical standards. Latex gloves are commonly used to
reduce exposure of the hands. When handling samples suspected or known
to contain high concentrations of the CDDs/CDFs, an additional set of
gloves can also be worn beneath the latex gloves.
5.3.3 Training--Workers must be trained in the proper method of
removing contaminated gloves and clothing without contacting the
exterior surfaces.
5.3.4 Personal hygiene--Hands and forearms should be washed
thoroughly after each manipulation and before breaks (coffee, lunch, and
shift).
5.3.5 Confinement--Isolated work areas posted with signs, segregated
glassware and tools, and plastic absorbent paper on bench tops will aid
in confining contamination.
5.3.6 Effluent vapors--The effluents of sample splitters from the
gas chromatograph (GC) and from roughing pumps on the mass spectrometer
(MS) should pass through either a column of activated charcoal or be
bubbled through a trap containing oil or high-boiling alcohols to
condense CDD/CDF vapors.
5.3.7 Waste Handling--Good technique includes minimizing
contaminated waste. Plastic bag liners should be used in waste cans.
Janitors and other personnel must be trained in the safe handling of
waste.
5.3.8 Decontamination
5.3.8.1 Decontamination of personnel--Use any mild soap with plenty
of scrubbing action.
5.3.8.2 Glassware, tools, and surfaces--Chlorothene NU Solvent is
the least toxic solvent shown to be effective. Satisfactory cleaning may
be accomplished by rinsing with Chlorothene, then washing with any
detergent and water. If glassware is first rinsed
[[Page 266]]
with solvent, then the dish water may be disposed of in the sewer. Given
the cost of disposal, it is prudent to minimize solvent wastes.
5.3.9 Laundry--Clothing known to be contaminated should be collected
in plastic bags. Persons who convey the bags and launder the clothing
should be advised of the hazard and trained in proper handling. The
clothing may be put into a washer without contact if the launderer knows
of the potential problem. The washer should be run through a cycle
before being used again for other clothing.
5.3.10 Wipe tests--A useful method of determining cleanliness of
work surfaces and tools is to wipe the surface with a piece of filter
paper. Extraction and analysis by GC with an electron capture detector
(ECD) can achieve a limit of detection of 0.1 [micro]g per wipe;
analysis using this method can achieve an even lower detection limit.
Less than 0.1 [micro]g per wipe indicates acceptable cleanliness;
anything higher warrants further cleaning. More than 10 [micro]g on a
wipe constitutes an acute hazard and requires prompt cleaning before
further use of the equipment or work space, and indicates that
unacceptable work practices have been employed.
5.3.11 Table or wrist-action shaker--The use of a table or wrist-
action shaker for extraction of tissues presents the possibility of
breakage of the extraction bottle and spillage of acid and flammable
organic solvent. A secondary containment system around the shaker is
suggested to prevent the spread of acid and solvents in the event of
such a breakage. The speed and intensity of shaking action should also
be adjusted to minimize the possibility of breakage.
6.0 Apparatus and Materials
Note: Brand names, suppliers, and part numbers are for illustration
purposes only and no endorsement is implied. Equivalent performance may
be achieved using apparatus and materials other than those specified
here. Meeting the performance requirements of this method is the
responsibility of the laboratory.
6.1 Sampling Equipment for Discrete or Composite Sampling
6.1.1 Sample bottles and caps
6.1.1.1 Liquid samples (waters, sludges and similar materials
containing 5% solids or less)--Sample bottle, amber glass, 1.1 L
minimum, with screw cap.
6.1.1.2 Solid samples (soils, sediments, sludges, paper pulps,
filter cake, compost, and similar materials that contain more than 5%
solids)--Sample bottle, wide mouth, amber glass, 500 mL minimum.
6.1.1.3 If amber bottles are not available, samples shall be
protected from light.
6.1.1.4 Bottle caps--Threaded to fit sample bottles. Caps shall be
lined with fluoropolymer.
6.1.1.5 Cleaning
6.1.1.5.1 Bottles are detergent water washed, then solvent rinsed
before use.
6.1.1.5.2 Liners are detergent water washed, rinsed with reagent
water (Section 7.6.1) followed by solvent, and baked at approximately
200 [deg]C for a minimum of 1 hour prior to use.
6.1.2 Compositing equipment--Automatic or manual compositing system
incorporating glass containers cleaned per bottle cleaning procedure
above. Only glass or fluoropolymer tubing shall be used. If the sampler
uses a peristaltic pump, a minimum length of compressible silicone
rubber tubing may be used in the pump only. Before use, the tubing shall
be thoroughly rinsed with methanol, followed by repeated rinsing with
reagent water to minimize sample contamination. An integrating flow
meter is used to collect proportional composite samples.
6.2 Equipment for Glassware Cleaning--Laboratory sink with overhead
fume hood.
6.3 Equipment for Sample Preparation
6.3.1 Laboratory fume hood of sufficient size to contain the sample
preparation equipment listed below.
6.3.2 Glove box (optional).
6.3.3 Tissue homogenizer--VirTis Model 45 Macro homogenizer
(American Scientific Products H-3515, or equivalent) with stainless
steel Macro-shaft and Turbo-shear blade.
6.3.4 Meat grinder--Hobart, or equivalent, with 3-5 mm holes in
inner plate.
6.3.5 Equipment for determining percent moisture
6.3.5.1 Oven--Capable of maintaining a temperature of 110 5 [deg]C.
6.3.5.2 Dessicator.
6.3.6 Balances
6.3.6.1 Analytical--Capable of weighing 0.1 mg.
6.3.6.2 Top loading--Capable of weighing 10 mg.
6.4 Extraction Apparatus
6.4.1 Water samples
6.4.1.1 pH meter, with combination glass electrode.
6.4.1.2 pH paper, wide range (Hydrion Papers, or equivalent).
6.4.1.3 Graduated cylinder, 1 L capacity.
6.4.1.4 Liquid/liquid extraction--Separatory funnels, 250 mL, 500
mL, and 2000 mL, with fluoropolymer stopcocks.
6.4.1.5 Solid-phase extraction
6.4.1.5.1 One liter filtration apparatus, including glass funnel,
glass frit support, clamp, adapter, stopper, filtration flask, and
vacuum tubing (Figure 4). For wastewater samples, the apparatus should
accept 90 or 144 mm disks. For drinking water or other samples
containing low solids, smaller disks may be used.
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6.4.1.5.2 Vacuum source capable of maintaining 25 in. Hg, equipped
with shutoff valve and vacuum gauge.
6.4.1.5.3 Glass-fiber filter--Whatman GMF 150 (or equivalent), 1
micron pore size, to fit filtration apparatus in Section 6.4.1.5.1.
6.4.1.5.4 Solid-phase extraction disk containing octadecyl
(C18) bonded silica uniformly enmeshed in an inert matrix--
Fisher Scientific 14-378F (or equivalent), to fit filtration apparatus
in Section 6.4.1.5.1.
6.4.2 Soxhlet/Dean-Stark (SDS) extractor (Figure 5)--For filters and
solid/sludge samples.
6.4.2.1 Soxhlet--50 mm ID, 200 mL capacity with 500 mL flask (Cal-
Glass LG-6900, or equivalent, except substitute 500 mL round-bottom
flask for 300 mL flat-bottom flask).
6.4.2.2 Thimble--43 x 123 to fit Soxhlet (Cal-Glass LG-6901-122, or
equivalent).
6.4.2.3 Moisture trap--Dean Stark or Barret with fluoropolymer
stopcock, to fit Soxhlet.
6.4.2.4 Heating mantle--Hemispherical, to fit 500 mL round-bottom
flask (Cal-Glass LG-8801-112, or equivalent).
6.4.2.5 Variable transformer--Powerstat (or equivalent), 110 volt,
10 amp.
6.4.3 Apparatus for extraction of tissue.
6.4.3.1 Bottle for extraction (if digestion/extraction using HCl is
used)'' 500-600 mL wide-mouth clear glass, with fluoropolymer-lined cap.
6.4.3.2 Bottle for back-extraction--100-200 mL narrow-mouth clear
glass with fluoropolymer-lined cap.
6.4.3.3 Mechanical shaker--Wrist-action or platform-type rotary
shaker that produces vigorous agitation (Sybron Thermolyne Model LE
``Big Bill'' rotator/shaker, or equivalent).
6.4.3.4 Rack attached to shaker table to permit agitation of four to
nine samples simultaneously.
6.4.4 Beakers--400-500 mL.
6.4.5 Spatulas--Stainless steel.
6.5 Filtration Apparatus.
6.5.1 Pyrex glass wool--Solvent-extracted by SDS for three hours
minimum.
Note: Baking glass wool may cause active sites that will
irreversibly adsorb CDDs/CDFs.
6.5.2 Glass funnel--125-250 mL.
6.5.3 Glass-fiber filter paper--Whatman GF/D (or equivalent), to fit
glass funnel in Section 6.5.2.
6.5.4 Drying column--15-20 mm ID Pyrex chromatographic column
equipped with coarse-glass frit or glass-wool plug.
6.5.5 Buchner funnel--15 cm.
6.5.6 Glass-fiber filter paper--to fit Buchner funnel in Section
6.5.5.
6.5.7 Filtration flasks--1.5-2.0 L, with side arm.
6.5.8 Pressure filtration apparatus--Millipore YT30 142 HW, or
equivalent.
6.6 Centrifuge Apparatus.
6.6.1 Centrifuge--Capable of rotating 500 mL centrifuge bottles or
15 mL centrifuge tubes at 5,000 rpm minimum.
6.6.2 Centrifuge bottles--500 mL, with screw-caps, to fit
centrifuge.
6.6.3 Centrifuge tubes--12-15 mL, with screw-caps, to fit
centrifuge.
6.7 Cleanup Apparatus.
6.7.1 Automated gel permeation chromatograph (Analytical Biochemical
Labs, Inc, Columbia, MO, Model GPC Autoprep 1002, or equivalent).
6.7.1.1 Column--600-700 mm long x 25 mm ID, packed with 70 g of
SX-3 Bio-beads (Bio-Rad Laboratories, Richmond, CA, or equivalent).
6.7.1.2 Syringe--10 mL, with Luer fitting.
6.7.1.3 Syringe filter holder--stainless steel, and glass-fiber or
fluoropolymer filters (Gelman 4310, or equivalent).
6.7.1.4 UV detectors--254 nm, preparative or semi-preparative flow
cell (Isco, Inc., Type 6; Schmadzu, 5 mm path length; Beckman-Altex
152W, 8 [micro]L micro-prep flow cell, 2 mm path; Pharmacia UV-1, 3 mm
flow cell; LDC Milton-Roy UV-3, monitor 1203; or equivalent).
6.7.2 Reverse-phase high-performance liquid chromatograph.
6.7.2.1 Column oven and detector--Perkin-Elmer Model LC-65T (or
equivalent) operated at 0.02 AUFS at 235 nm.
6.7.2.2 Injector--Rheodyne 7120 (or equivalent) with 50 [micro]L
sample loop.
6.7.2.3 Column--Two 6.2 mm x 250 mm Zorbax-ODS columns in series
(DuPont Instruments Division, Wilmington, DE, or equivalent), operated
at 50 [deg]C with 2.0 mL/min methanol isocratic effluent.
6.7.2.4 Pump--Altex 110A (or equivalent).
6.7.3 Pipets.
6.7.3.1 Disposable, pasteur--150 mm long x 5-mm ID (Fisher
Scientific 13-678-6A, or equivalent).
6.7.3.2 Disposable, serological--10 mL (6 mm ID).
6.7.4 Glass chromatographic columns.
6.7.4.1 150 mm long x 8-mm ID, (Kontes K-420155, or equivalent) with
coarse-glass frit or glass-wool plug and 250 mL reservoir.
6.7.4.2 200 mm long x 15 mm ID, with coarse-glass frit or glass-wool
plug and 250 mL reservoir.
6.7.4.3 300 mm long x 25 mm ID, with 300 mL reservoir and glass or
fluoropolymer stopcock.
6.7.5 Stirring apparatus for batch silica cleanup of tissue
extracts.
6.7.5.1 Mechanical stirrer--Corning Model 320, or equivalent.
6.7.5.2 Bottle--500-600 mL wide-mouth clear glass.
6.7.6 Oven--For baking and storage of adsorbents, capable of
maintaining a constant temperature (5 [deg]C) in
the range of 105-250 [deg]C.
6.8 Concentration Apparatus.
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6.8.1 Rotary evaporator--Buchi/Brinkman-American Scientific No.
E5045-10 or equivalent, equipped with a variable temperature water bath.
6.8.1.1 Vacuum source for rotary evaporator equipped with shutoff
valve at the evaporator and vacuum gauge.
6.8.1.2 A recirculating water pump and chiller are recommended, as
use of tap water for cooling the evaporator wastes large volumes of
water and can lead to inconsistent performance as water temperatures and
pressures vary.
6.8.1.3 Round-bottom flask--100 mL and 500 mL or larger, with
ground-glass fitting compatible with the rotary evaporator.
6.8.2 Kuderna-Danish (K-D) Concentrator.
6.8.2.1 Concentrator tube--10 mL, graduated (Kontes K-570050-1025,
or equivalent) with calibration verified. Ground-glass stopper (size 19/
22 joint) is used to prevent evaporation of extracts.
6.8.2.2 Evaporation flask--500 mL (Kontes K-570001-0500, or
equivalent), attached to concentrator tube with springs (Kontes K-
662750-0012 or equivalent).
6.8.2.3 Snyder column--Three-ball macro (Kontes K-503000-0232, or
equivalent).
6.8.2.4 Boiling chips.
6.8.2.4.1 Glass or silicon carbide--Approximately 10/40 mesh,
extracted with methylene chloride and baked at 450 [deg]C for one hour
minimum.
6.8.2.4.2 Fluoropolymer (optional)--Extracted with methylene
chloride.
6.8.2.5 Water bath--Heated, with concentric ring cover, capable of
maintaining a temperature within 2 [deg]C,
installed in a fume hood.
6.8.3 Nitrogen blowdown apparatus--Equipped with water bath
controlled in the range of 30-60 [deg]C (N-Evap, Organomation
Associates, Inc., South Berlin, MA, or equivalent), installed in a fume
hood.
6.8.4 Sample vials.
6.8.4.1 Amber glass--2-5 mL with fluoropolymer-lined screw-cap.
6.8.4.2 Glass--0.3 mL, conical, with fluoropolymer-lined screw or
crimp cap.
6.9 Gas Chromatograph--Shall have splitless or on-column injection
port for capillary column, temperature program with isothermal hold, and
shall meet all of the performance specifications in Section 10.
6.9.1 GC column for CDDs/CDFs and for isomer specificity for
2,3,7,8-TCDD--60 5 m long x 0.32 0.02 mm ID; 0.25 [micro]m 5% phenyl, 94% methyl, 1%
vinyl silicone bonded-phase fused-silica capillary column (J&W DB-5, or
equivalent).
6.9.2 GC column for isomer specificity for 2,3,7,8-TCDF--30 5 m long x 0.32 0.02 mm ID; 0.25
[micro]m bonded-phase fused-silica capillary column (J&W DB-225, or
equivalent).
6.10 Mass Spectrometer--28-40 eV electron impact ionization, shall
be capable of repetitively selectively monitoring 12 exact m/z's minimum
at high resolution (=10,000) during a period of approximately
one second, and shall meet all of the performance specifications in
Section 10.
6.11 GC/MS Interface--The mass spectrometer (MS) shall be interfaced
to the GC such that the end of the capillary column terminates within 1
cm of the ion source but does not intercept the electron or ion beams.
6.12 Data System--Capable of collecting, recording, and storing MS
data.
7.0 Reagents and Standards
7.1 pH Adjustment and Back-Extraction.
7.1.1 Potassium hydroxide--Dissolve 20 g reagent grade KOH in 100 mL
reagent water.
7.1.2 Sulfuric acid--Reagent grade (specific gravity 1.84).
7.1.3 Hydrochloric acid--Reagent grade, 6N.
7.1.4 Sodium chloride--Reagent grade, prepare at 5% (w/v) solution
in reagent water.
7.2 Solution Drying and Evaporation.
7.2.1 Solution drying--Sodium sulfate, reagent grade, granular,
anhydrous (Baker 3375, or equivalent), rinsed with methylene chloride
(20 mL/g), baked at 400 [deg]C for one hour minimum, cooled in a
dessicator, and stored in a pre-cleaned glass bottle with screw-cap that
prevents moisture from entering. If, after heating, the sodium sulfate
develops a noticeable grayish cast (due to the presence of carbon in the
crystal matrix), that batch of reagent is not suitable for use and
should be discarded. Extraction with methylene chloride (as opposed to
simple rinsing) and baking at a lower temperature may produce sodium
sulfate that is suitable for use.
7.2.2 Tissue drying--Sodium sulfate, reagent grade, powdered,
treated and stored as above.
7.2.3 Prepurified nitrogen.
7.3 Extraction.
7.3.1 Solvents--Acetone, toluene, cyclohexane, hexane, methanol,
methylene chloride, and nonane; distilled in glass, pesticide quality,
lot-certified to be free of interferences.
7.3.2 White quartz sand, 60/70 mesh--For Soxhlet/Dean-Stark
extraction (Aldrich Chemical, Cat. No. 27-437-9, or equivalent). Bake at
450 [deg]C for four hours minimum.
7.4 GPC Calibration Solution--Prepare a solution containing 300 mg/
mL corn oil, 15 mg/mL bis(2-ethylhexyl) phthalate, 1.4 mg/mL
pentachlorophenol, 0.1 mg/mL perylene, and 0.5 mg/mL sulfur.
7.5 Adsorbents for Sample Cleanup.
7.5.1 Silica gel.
7.5.1.1 Activated silica gel--100-200 mesh, Supelco 1-3651 (or
equivalent), rinsed with methylene chloride, baked at 180 [deg]C for a
minimum of one hour, cooled in a dessicator, and stored in a precleaned
glass bottle with
[[Page 269]]
screw-cap that prevents moisture from entering.
7.5.1.2 Acid silica gel (30% w/w)--Thoroughly mix 44.0 g of
concentrated sulfuric acid with 100.0 g of activated silica gel in a
clean container. Break up aggregates with a stirring rod until a uniform
mixture is obtained. Store in a bottle with a fluoropolymer-lined screw-
cap.
7.5.1.3 Basic silica gel--Thoroughly mix 30 g of 1N sodium hydroxide
with 100 g of activated silica gel in a clean container. Break up
aggregates with a stirring rod until a uniform mixture is obtained.
Store in a bottle with a fluoropolymer-lined screw-cap.
7.5.1.4 Potassium silicate.
7.5.1.4.1 Dissolve 56 g of high purity potassium hydroxide (Aldrich,
or equivalent) in 300 mL of methanol in a 750-1000 mL flat-bottom flask.
7.5.1.4.2 Add 100 g of silica gel and a stirring bar, and stir on a
hot plate at 60-70 [deg]C for one to two hours.
7.5.1.4.3 Decant the liquid and rinse the potassium silicate twice
with 100 mL portions of methanol, followed by a single rinse with 100 mL
of methylene chloride.
7.5.1.4.4 Spread the potassium silicate on solvent-rinsed aluminum
foil and dry for two to four hours in a hood.
7.5.1.4.5 Activate overnight at 200-250 [deg]C.
7.5.2 Alumina--Either one of two types of alumina, acid or basic,
may be used in the cleanup of sample extracts, provided that the
laboratory can meet the performance specifications for the recovery of
labeled compounds described in Section 9.3. The same type of alumina
must be used for all samples, including those used to demonstrate
initial precision and recovery (Section 9.2) and ongoing precision and
recovery (Section 15.5).
7.5.2.1 Acid alumina--Supelco 19996-6C (or equivalent). Activate by
heating to 130 [deg]C for a minimum of 12 hours.
7.5.2.2 Basic alumina--Supelco 19944-6C (or equivalent). Activate by
heating to 600 [deg]C for a minimum of 24 hours. Alternatively, activate
by heating in a tube furnace at 650-700 [deg]C under an air flow rate of
approximately 400 cc/minute. Do not heat over 700 [deg]C, as this can
lead to reduced capacity for retaining the analytes. Store at 130 [deg]C
in a covered flask. Use within five days of baking.
7.5.3 Carbon.
7.5.3.1 Carbopak C--(Supelco 1-0258, or equivalent).
7.5.3.2 Celite 545--(Supelco 2-0199, or equivalent).
7.5.3.3 Thoroughly mix 9.0 g Carbopak C and 41.0 g Celite 545 to
produce an 18% w/w mixture. Activate the mixture at 130 [deg]C for a
minimum of six hours. Store in a dessicator.
7.5.4 Anthropogenic isolation column--Pack the column in Section
6.7.4.3 from bottom to top with the following:
7.5.4.1 2 g silica gel (Section 7.5.1.1).
7.5.4.2 2 g potassium silicate (Section 7.5.1.4).
7.5.4.3 2 g granular anhydrous sodium sulfate (Section 7.2.1).
7.5.4.4 10 g acid silica gel (Section 7.5.1.2).
7.5.4.5 2 g granular anhydrous sodium sulfate.
7.5.5 Florisil column.
7.5.5.1 Florisil--60-100 mesh, Floridin Corp (or equivalent).
Soxhlet extract in 500 g portions for 24 hours.
7.5.5.2 Insert a glass wool plug into the tapered end of a graduated
serological pipet (Section 6.7.3.2). Pack with 1.5 g (approx 2 mL) of
Florisil topped with approx 1 mL of sodium sulfate (Section 7.2.1) and a
glass wool plug.
7.5.5.3 Activate in an oven at 130-150 [deg]C for a minimum of 24
hours and cool for 30 minutes. Use within 90 minutes of cooling.
7.6 Reference Matrices--Matrices in which the CDDs/CDFs and
interfering compounds are not detected by this method.
7.6.1 Reagent water--Bottled water purchased locally, or prepared by
passage through activated carbon.
7.6.2 High-solids reference matrix--Playground sand or similar
material. Prepared by extraction with methylene chloride and/or baking
at 450 [deg]C for a minimum of four hours.
7.6.3 Paper reference matrix--Glass-fiber filter, Gelman Type A, or
equivalent. Cut paper to simulate the surface area of the paper sample
being tested.
7.6.4 Tissue reference matrix--Corn or other vegetable oil. May be
prepared by extraction with methylene chloride.
7.6.5 Other matrices--This method may be verified on any reference
matrix by performing the tests given in Section 9.2. Ideally, the matrix
should be free of the CDDs/CDFs, but in no case shall the background
level of the CDDs/CDFs in the reference matrix exceed three times the
minimum levels in Table 2. If low background levels of the CDDs/CDFs are
present in the reference matrix, the spike level of the analytes used in
Section 9.2 should be increased to provide a spike-to-background ratio
in the range of 1:1 to 5:1 (Reference 15).
7.7 Standard Solutions--Purchased as solutions or mixtures with
certification to their purity, concentration, and authenticity, or
prepared from materials of known purity and composition. If the chemical
purity is 98% or greater, the weight may be used without correction to
compute the concentration of the standard. When not being used,
standards are stored in the dark at room temperature in screw-capped
vials with fluoropolymer-lined caps. A mark is placed on the vial at the
level of the solution so that solvent loss by evaporation can be
detected. If solvent loss has occurred, the solution should be replaced.
7.8 Stock Solutions.
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7.8.1 Preparation--Prepare in nonane per the steps below or purchase
as dilute solutions (Cambridge Isotope Laboratories (CIL), Woburn, MA,
or equivalent). Observe the safety precautions in Section 5, and the
recommendation in Section 5.1.2.
7.8.2 Dissolve an appropriate amount of assayed reference material
in solvent. For example, weigh 1-2 mg of 2,3,7,8-TCDD to three
significant figures in a 10 mL ground-glass-stoppered volumetric flask
and fill to the mark with nonane. After the TCDD is completely
dissolved, transfer the solution to a clean 15 mL vial with
fluoropolymer-lined cap.
7.8.3 Stock standard solutions should be checked for signs of
degradation prior to the preparation of calibration or performance test
standards. Reference standards that can be used to determine the
accuracy of calibration standards are available from CIL and may be
available from other vendors.
7.9 PAR Stock Solution
7.9.1 All CDDs/CDFs--Using the solutions in Section 7.8, prepare the
PAR stock solution to contain the CDDs/CDFs at the concentrations shown
in Table 3. When diluted, the solution will become the PAR (Section
7.14).
7.9.2 If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined,
prepare the PAR stock solution to contain these compounds only.
7.10 Labeled-Compound Spiking Solution.
7.10.1 All CDDs/CDFs--From stock solutions, or from purchased
mixtures, prepare this solution to contain the labeled compounds in
nonane at the concentrations shown in Table 3. This solution is diluted
with acetone prior to use (Section 7.10.3).
7.10.2 If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined,
prepare the labeled-compound solution to contain these compounds only.
This solution is diluted with acetone prior to use (Section 7.10.3).
7.10.3 Dilute a sufficient volume of the labeled compound solution
(Section 7.10.1 or 7.10.2) by a factor of 50 with acetone to prepare a
diluted spiking solution. Each sample requires 1.0 mL of the diluted
solution, but no more solution should be prepared than can be used in
one day.
7.11 Cleanup Standard--Prepare \37\Cl\4\-2,3,7,8-TCDD in nonane at
the concentration shown in Table 3. The cleanup standard is added to all
extracts prior to cleanup to measure the efficiency of the cleanup
process.
7.12 Internal Standard(s).
7.12.1 All CDDs/CDFs--Prepare the internal standard solution to
contain \13\C\12\-1,2,3,4-TCDD and \13\C\2\-1,2,3,7,8,9-HxCDD in nonane
at the concentration shown in Table 3.
7.12.2 If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined,
prepare the internal standard solution to contain \13\C\12\-1,2,3,4-TCDD
only.
7.13 Calibration Standards (CS1 through CS5)--Combine the solutions
in Sections 7.9 through 7.12 to produce the five calibration solutions
shown in Table 4 in nonane. These solutions permit the relative response
(labeled to native) and response factor to be measured as a function of
concentration. The CS3 standard is used for calibration verification
(VER). If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined,
combine the solutions appropriate to these compounds.
7.14 Precision and Recovery (PAR) Standard--Used for determination
of initial (Section 9.2) and ongoing (Section 15.5) precision and
recovery. Dilute 10 [micro]L of the precision and recovery standard
(Section 7.9.1 or 7.9.2) to 2.0 mL with acetone for each sample matrix
for each sample batch. One mL each are required for the blank and OPR
with each matrix in each batch.
7.15 GC Retention Time Window Defining Solution and Isomer
Specificity Test Standard--Used to define the beginning and ending
retention times for the dioxin and furan isomers and to demonstrate
isomer specificity of the GC columns employed for determination of
2,3,7,8-TCDD and 2,3,7,8-TCDF. The standard must contain the compounds
listed in Table 5 (CIL EDF--4006, or equivalent), at a minimum. It is
not necessary to monitor the window-defining compounds if only 2,3,7,8-
TCDD and 2,3,7,8-TCDF are to be determined. In this case, an isomer-
specificity test standard containing the most closely eluted isomers
listed in Table 5 (CIL EDF-4033, or equivalent) may be used.
7.16 QC Check Sample--A QC Check Sample should be obtained from a
source independent of the calibration standards. Ideally, this check
sample would be a certified reference material containing the CDDs/CDFs
in known concentrations in a sample matrix similar to the matrix under
test.
7.17 Stability of Solutions--Standard solutions used for
quantitative purposes (Sections 7.9 through 7.15) should be analyzed
periodically, and should be assayed against reference standards (Section
7.8.3) before further use.
8.0 Sample Collection, Preservation, Storage, and Holding Times
8.1 Collect samples in amber glass containers following conventional
sampling practices (Reference 16). Aqueous samples that flow freely are
collected in refrigerated bottles using automatic sampling equipment.
Solid samples are collected as grab samples using wide-mouth jars.
8.2 Maintain aqueous samples in the dark at 0-4 [deg]C from the time
of collection until receipt at the laboratory. If residual chlorine is
present in aqueous samples, add 80 mg sodium thiosulfate per liter of
water. EPA
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Methods 330.4 and 330.5 may be used to measure residual chlorine
(Reference 17). If sample pH is greater than 9, adjust to pH 7-9 with
sulfuric acid.
Maintain solid, semi-solid, oily, and mixed-phase samples in the
dark at <4 [deg]C from the time of collection until receipt at the
laboratory.
Store aqueous samples in the dark at 0-4 [deg]C. Store solid, semi-
solid, oily, mixed-phase, and tissue samples in the dark at <-10 [deg]C.
8.3 Fish and Tissue Samples.
8.3.1 Fish may be cleaned, filleted, or processed in other ways in
the field, such that the laboratory may expect to receive whole fish,
fish fillets, or other tissues for analysis.
8.3.2 Fish collected in the field should be wrapped in aluminum
foil, and must be maintained at a temperature less than 4 [deg]C from
the time of collection until receipt at the laboratory.
8.3.3 Samples must be frozen upon receipt at the laboratory and
maintained in the dark at <-10 [deg]C until prepared. Maintain unused
sample in the dark at <-10 [deg]C.
8.4 Holding Times.
8.4.1 There are no demonstrated maximum holding times associated
with CDDs/CDFs in aqueous, solid, semi-solid, tissues, or other sample
matrices. If stored in the dark at 0-4 [deg]C and preserved as given
above (if required), aqueous samples may be stored for up to one year.
Similarly, if stored in the dark at <-10 [deg]C, solid, semi-solid,
multi-phase, and tissue samples may be stored for up to one year.
8.4.2 Store sample extracts in the dark at <-10 [deg]C until
analyzed. If stored in the dark at <-10 [deg]C, sample extracts may be
stored for up to one year.
9.0 Quality Assurance/Quality Control
9.1 Each laboratory that uses this method is required to operate a
formal quality assurance program (Reference 18). The minimum
requirements of this program consist of an initial demonstration of
laboratory capability, analysis of samples spiked with labeled compounds
to evaluate and document data quality, and analysis of standards and
blanks as tests of continued performance. Laboratory performance is
compared to established performance criteria to determine if the results
of analyses meet the performance characteristics of the method.
If the method is to be applied to sample matrix other than water
(e.g., soils, filter cake, compost, tissue) the most appropriate
alternate matrix (Sections 7.6.2 through 7.6.5) is substituted for the
reagent water matrix (Section 7.6.1) in all performance tests.
9.1.1 The analyst shall make an initial demonstration of the ability
to generate acceptable accuracy and precision with this method. This
ability is established as described in Section 9.2.
9.1.2 In recognition of advances that are occurring in analytical
technology, and to allow the analyst to overcome sample matrix
interferences, the analyst is permitted certain options to improve
separations or lower the costs of measurements. These options include
alternate extraction, concentration, cleanup procedures, and changes in
columns and detectors. Alternate determinative techniques, such as the
substitution of spectroscopic or immuno-assay techniques, and changes
that degrade method performance, are not allowed. If an analytical
technique other than the techniques specified in this method is used,
that technique must have a specificity equal to or better than the
specificity of the techniques in this method for the analytes of
interest.
9.1.2.1 Each time a modification is made to this method, the analyst
is required to repeat the procedure in Section 9.2. If the detection
limit of the method will be affected by the change, the laboratory is
required to demonstrate that the MDL (40 CFR part 136, appendix B) is
lower than one-third the regulatory compliance level or one-third the ML
in this method, whichever is higher. If calibration will be affected by
the change, the analyst must recalibrate the instrument per Section 10.
9.1.2.2 The laboratory is required to maintain records of
modifications made to this method. These records include the following,
at a minimum:
9.1.2.2.1 The names, titles, addresses, and telephone numbers of the
analyst(s) who performed the analyses and modification, and of the
quality control officer who witnessed and will verify the analyses and
modifications.
9.1.2.2.2 A listing of pollutant(s) measured, by name and CAS
Registry number.
9.1.2.2.3 A narrative stating reason(s) for the modifications.
9.1.2.2.4 Results from all quality control (QC) tests comparing the
modified method to this method, including:
(a) Calibration (Section 10.5 through 10.7).
(b) Calibration verification (Section 15.3).
(c) Initial precision and recovery (Section 9.2).
(d) Labeled compound recovery (Section 9.3).
(e) Analysis of blanks (Section 9.5).
(f) Accuracy assessment (Section 9.4).
9.1.2.2.5 Data that will allow an independent reviewer to validate
each determination by tracing the instrument output (peak height, area,
or other signal) to the final result. These data are to include:
(a) Sample numbers and other identifiers.
(b) Extraction dates.
(c) Analysis dates and times.
(d) Analysis sequence/run chronology.
(e) Sample weight or volume (Section 11).
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(f) Extract volume prior to each cleanup step (Section 13).
(g) Extract volume after each cleanup step (Section 13).
(h) Final extract volume prior to injection (Section 14).
(i) Injection volume (Section 14.3).
(j) Dilution data, differentiating between dilution of a sample or
extract (Section 17.5).
(k) Instrument and operating conditions.
(l) Column (dimensions, liquid phase, solid support, film thickness,
etc).
(m) Operating conditions (temperatures, temperature program, flow
rates).
(n) Detector (type, operating conditions, etc).
(o) Chromatograms, printer tapes, and other recordings of raw data.
(p) Quantitation reports, data system outputs, and other data to
link the raw data to the results reported.
9.1.3 Analyses of method blanks are required to demonstrate freedom
from contamination (Section 4.3). The procedures and criteria for
analysis of a method blank are described in Sections 9.5 and 15.6.
9.1.4 The laboratory shall spike all samples with labeled compounds
to monitor method performance. This test is described in Section 9.3.
When results of these spikes indicate atypical method performance for
samples, the samples are diluted to bring method performance within
acceptable limits. Procedures for dilution are given in Section 17.5.
9.1.5 The laboratory shall, on an ongoing basis, demonstrate through
calibration verification and the analysis of the ongoing precision and
recovery aliquot that the analytical system is in control. These
procedures are described in Sections 15.1 through 15.5.
9.1.6 The laboratory shall maintain records to define the quality of
data that is generated. Development of accuracy statements is described
in Section 9.4.
9.2 Initial Precision and Recovery (IPR)--To establish the ability
to generate acceptable precision and recovery, the analyst shall perform
the following operations.
9.2.1 For low solids (aqueous) samples, extract, concentrate, and
analyze four 1 L aliquots of reagent water spiked with the diluted
labeled compound spiking solution (Section 7.10.3) and the precision and
recovery standard (Section 7.14) according to the procedures in Sections
11 through 18. For an alternative sample matrix, four aliquots of the
alternative reference matrix (Section 7.6) are used. All sample
processing steps that are to be used for processing samples, including
preparation (Section 11), extraction (Section 12), and cleanup (Section
13), shall be included in this test.
9.2.2 Using results of the set of four analyses, compute the average
concentration (X) of the extracts in ng/mL and the standard deviation of
the concentration (s) in ng/mL for each compound, by isotope dilution
for CDDs/CDFs with a labeled analog, and by internal standard for
1,2,3,7,8,9-HxCDD, OCDF, and the labeled compounds.
9.2.3 For each CDD/CDF and labeled compound, compare s and X with
the corresponding limits for initial precision and recovery in Table 6.
If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined, compare s
and X with the corresponding limits for initial precision and recovery
in Table 6a. If s and X for all compounds meet the acceptance criteria,
system performance is acceptable and analysis of blanks and samples may
begin. If, however, any individual s exceeds the precision limit or any
individual X falls outside the range for accuracy, system performance is
unacceptable for that compound. Correct the problem and repeat the test
(Section 9.2).
9.3 The laboratory shall spike all samples with the diluted labeled
compound spiking solution (Section 7.10.3) to assess method performance
on the sample matrix.
9.3.1 Analyze each sample according to the procedures in Sections 11
through 18.
9.3.2 Compute the percent recovery of the labeled compounds and the
cleanup standard using the internal standard method (Section 17.2).
9.3.3 The recovery of each labeled compound must be within the
limits in Table 7 when all 2,3,7,8-substituted CDDs/CDFs are determined,
and within the limits in Table 7a when only 2,3,7,8-TCDD and 2,3,7,8-
TCDF are determined. If the recovery of any compound falls outside of
these limits, method performance is unacceptable for that compound in
that sample. To overcome such difficulties, water samples are diluted
and smaller amounts of soils, sludges, sediments, and other matrices are
reanalyzed per Section 18.4.
9.4 Recovery of labeled compounds from samples should be assessed
and records should be maintained.
9.4.1 After the analysis of five samples of a given matrix type
(water, soil, sludge, pulp, etc.) for which the labeled compounds pass
the tests in Section 9.3, compute the average percent recovery (R) and
the standard deviation of the percent recovery (SR) for the labeled
compounds only. Express the assessment as a percent recovery interval
from R-2SR to R=2SR for each matrix. For example,
if R = 90% and SR = 10% for five analyses of pulp, the
recovery interval is expressed as 70-110%.
9.4.2 Update the accuracy assessment for each labeled compound in
each matrix on a regular basis (e.g., after each 5-10 new measurements).
9.5 Method Blanks--Reference matrix method blanks are analyzed to
demonstrate freedom from contamination (Section 4.3).
[[Page 273]]
9.5.1 Prepare, extract, clean up, and concentrate a method blank
with each sample batch (samples of the same matrix started through the
extraction process on the same 12-hour shift, to a maximum of 20
samples). The matrix for the method blank shall be similar to sample
matrix for the batch, e.g., a 1 L reagent water blank (Section 7.6.1),
high-solids reference matrix blank (Section 7.6.2), paper matrix blank
(Section 7.6.3); tissue blank (Section 7.6.4) or alternative reference
matrix blank (Section 7.6.5). Analyze the blank immediately after
analysis of the OPR (Section 15.5) to demonstrate freedom from
contamination.
9.5.2 If any 2,3,7,8-substituted CDD/CDF (Table 1) is found in the
blank at greater than the minimum level (Table 2) or one-third the
regulatory compliance level, whichever is greater; or if any potentially
interfering compound is found in the blank at the minimum level for each
level of chlorination given in Table 2 (assuming a response factor of 1
relative to the \13\C12-1,2,3,4-TCDD internal standard for
compounds not listed in Table 1), analysis of samples is halted until
the blank associated with the sample batch shows no evidence of
contamination at this level. All samples must be associated with an
uncontaminated method blank before the results for those samples may be
reported for regulatory compliance purposes.
9.6 QC Check Sample--Analyze the QC Check Sample (Section 7.16)
periodically to assure the accuracy of calibration standards and the
overall reliability of the analytical process. It is suggested that the
QC Check Sample be analyzed at least quarterly.
9.7 The specifications contained in this method can be met if the
apparatus used is calibrated properly and then maintained in a
calibrated state. The standards used for calibration (Section 10),
calibration verification (Section 15.3), and for initial (Section 9.2)
and ongoing (Section 15.5) precision and recovery should be identical,
so that the most precise results will be obtained. A GC/MS instrument
will provide the most reproducible results if dedicated to the settings
and conditions required for the analyses of CDDs/CDFs by this method.
9.8 Depending on specific program requirements, field replicates may
be collected to determine the precision of the sampling technique, and
spiked samples may be required to determine the accuracy of the analysis
when the internal standard method is used.
10.0 Calibration
10.1 Establish the operating conditions necessary to meet the
minimum retention times for the internal standards in Section 10.2.4 and
the relative retention times for the CDDs/CDFs in Table 2.
10.1.1 Suggested GC operating conditions:
Injector temperature: 270 [deg]C
Interface temperature: 290 [deg]C
Initial temperature: 200 [deg]C
Initial time: Two minutes
Temperature program:
200-220 [deg]C, at 5 [deg]C/minute
220 [deg]C for 16 minutes
220-235 [deg]C, at 5 [deg]C/minute
235 [deg]C for seven minutes
235-330 [deg]C, at 5 [deg]C/minute
Note: All portions of the column that connect the GC to the ion
source shall remain at or above the interface temperature specified
above during analysis to preclude condensation of less volatile
compounds.
Optimize GC conditions for compound separation and sensitivity. Once
optimized, the same GC conditions must be used for the analysis of all
standards, blanks, IPR and OPR aliquots, and samples.
10.1.2 Mass spectrometer (MS) resolution--Obtain a selected ion
current profile (SICP) of each analyte in Table 3 at the two exact m/z's
specified in Table 8 and at =10,000 resolving power by
injecting an authentic standard of the CDDs/CDFs either singly or as
part of a mixture in which there is no interference between closely
eluted components.
10.1.2.1 The analysis time for CDDs/CDFs may exceed the long-term
mass stability of the mass spectrometer. Because the instrument is
operated in the high-resolution mode, mass drifts of a few ppm (e.g., 5
ppm in mass) can have serious adverse effects on instrument performance.
Therefore, a mass-drift correction is mandatory and a lock-mass m/z from
PFK is used for drift correction. The lock-mass m/z is dependent on the
exact m/z's monitored within each descriptor, as shown in Table 8. The
level of PFK metered into the HRMS during analyses should be adjusted so
that the amplitude of the most intense selected lock-mass m/z signal
(regardless of the descriptor number) does not exceed 10% of the full-
scale deflection for a given set of detector parameters. Under those
conditions, sensitivity changes that might occur during the analysis can
be more effectively monitored.
Note: Excessive PFK (or any other reference substance) may cause
noise problems and contamination of the ion source necessitating
increased frequency of source cleaning.
10.1.2.2 If the HRMS has the capability to monitor resolution during
the analysis, it is acceptable to terminate the analysis when the
resolution falls below 10,000 to save reanalysis time.
10.1.2.3 Using a PFK molecular leak, tune the instrument to meet the
minimum required resolving power of 10,000 (10% valley) at m/z 304.9824
(PFK) or any other reference signal close to m/z 304 (from TCDF). For
each
[[Page 274]]
descriptor (Table 8), monitor and record the resolution and exact m/z's
of three to five reference peaks covering the mass range of the
descriptor. The resolution must be greater than or equal to 10,000, and
the deviation between the exact m/z and the theoretical m/z (Table 8)
for each exact m/z monitored must be less than 5 ppm.
10.2 Ion Abundance Ratios, Minimum Levels, Signal-to-Noise Ratios,
and Absolute Retention Times--Choose an injection volume of either 1
[micro]L or 2 [micro]L, consistent with the capability of the HRGC/HRMS
instrument. Inject a 1 [micro]L or 2 [micro]L aliquot of the CS1
calibration solution (Table 4) using the GC conditions from Section
10.1.1. If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined, the
operating conditions and specifications below apply to analysis of those
compounds only.
10.2.1 Measure the SICP areas for each analyte, and compute the ion
abundance ratios at the exact m/z's specified in Table 8. Compare the
computed ratio to the theoretical ratio given in Table 9.
10.2.1.1 The exact m/z's to be monitored in each descriptor are
shown in Table 8. Each group or descriptor shall be monitored in
succession as a function of GC retention time to ensure that all CDDs/
CDFs are detected. Additional m/z's may be monitored in each descriptor,
and the m/z's may be divided among more than the five descriptors listed
in Table 8, provided that the laboratory is able to monitor the m/z's of
all the CDDs/CDFs that may elute from the GC in a given retention-time
window. If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined, the
descriptors may be modified to include only the exact m/z's for the
tetra-and penta-isomers, the diphenyl ethers, and the lock m/z's.
10.2.1.2 The mass spectrometer shall be operated in a mass-drift
correction mode, using perfluorokerosene (PFK) to provide lock m/z's.
The lock-mass for each group of m/z's is shown in Table 8. Each lock
mass shall be monitored and shall not vary by more than 20% throughout its respective retention time window.
Variations of the lock mass by more than 20% indicate the presence of
coeluting interferences that may significantly reduce the sensitivity of
the mass spectrometer. Reinjection of another aliquot of the sample
extract will not resolve the problem. Additional cleanup of the extract
may be required to remove the interferences.
10.2.2 All CDDs/CDFs and labeled compounds in the CS1 standard shall
be within the QC limits in Table 9 for their respective ion abundance
ratios; otherwise, the mass spectrometer shall be adjusted and this test
repeated until the m/z ratios fall within the limits specified. If the
adjustment alters the resolution of the mass spectrometer, resolution
shall be verified (Section 10.1.2) prior to repeat of the test.
10.2.3 Verify that the HRGC/HRMS instrument meets the minimum levels
in Table 2. The peaks representing the CDDs/CDFs and labeled compounds
in the CS1 calibration standard must have signal-to-noise ratios (S/N)
greater than or equal to 10.0. Otherwise, the mass spectrometer shall be
adjusted and this test repeated until the minimum levels in Table 2 are
met.
10.2.4 The absolute retention time of \13\C12-1,2,3,4-
TCDD (Section 7.12) shall exceed 25.0 minutes on the DB-5 column, and
the retention time of \13\C12-1,2,3,4-TCDD shall exceed 15.0
minutes on the DB-225 column; otherwise, the GC temperature program
shall be adjusted and this test repeated until the above-stated minimum
retention time criteria are met.
2010.3 Retention-Time Windows--Analyze the window defining mixtures
(Section 7.15) using the optimized temperature program in Section 10.1.
Table 5 gives the elution order (first/last) of the window-defining
compounds. If 2,3,7,8-TCDD and 2,3,7,8-TCDF only are to be analyzed,
this test is not required.
10.4 Isomer Specificity.
10.4.1 Analyze the isomer specificity test standards (Section 7.15)
using the procedure in Section 14 and the optimized conditions for
sample analysis (Section 10.1.1).
10.4.2 Compute the percent valley between the GC peaks that elute
most closely to the 2,3,7,8-TCDD and TCDF isomers, on their respective
columns, per Figures 6 and 7.
10.4.3 Verify that the height of the valley between the most closely
eluted isomers and the 2,3,7,8-substituted isomers is less than 25%
(computed as 100 x/y in Figures 6 and 7). If the valley exceeds 25%,
adjust the analytical conditions and repeat the test or replace the GC
column and recalibrate (Sections 10.1.2 through 10.7).
10.5 Calibration by Isotope Dilution--Isotope dilution calibration
is used for the 15 2,3,7,8-substituted CDDs/CDFs for which labeled
compounds are added to samples prior to extraction. The reference
compound for each CDD/CDF compound is shown in Table 2.
10.5.1 A calibration curve encompassing the concentration range is
prepared for each compound to be determined. The relative response (RR)
(labeled to native) vs. concentration in standard solutions is plotted
or computed using a linear regression. Relative response is determined
according to the procedures described below. Five calibration points are
employed.
10.5.2 The response of each CDD/CDF relative to its labeled analog
is determined using the area responses of both the primary and secondary
exact m/z's specified in Table 8, for each calibration standard, as
follows:
[[Page 275]]
[GRAPHIC] [TIFF OMITTED] TR15SE97.002
where:
A1n and A2n = The areas of the primary and
secondary m/z's for the CDD/CDF.
A1l and A2l = The areas of the primary and
secondary m/z's for the labeled compound.
Cl = The concentration of the labeled compound in the
calibration standard (Table 4).
Cn = The concentration of the native compound in the
calibration standard (Table 4).
10.5.3 To calibrate the analytical system by isotope dilution,
inject a volume of calibration standards CS1 through CS5 (Section 7.13
and Table 4) identical to the volume chosen in Section 10.2, using the
procedure in Section 14 and the conditions in Section 10.1.1 and Table
2. Compute the relative response (RR) at each concentration.
10.5.4 Linearity--If the relative response for any compound is
constant (less than 20% coefficient of variation) over the five-point
calibration range, an averaged relative response may be used for that
compound; otherwise, the complete calibration curve for that compound
shall be used over the five-point calibration range.
10.6 Calibration by Internal Standard--The internal standard method
is applied to determination of 1,2,3,7,8,9-HxCDD (Section 17.1.2), OCDF
(Section 17.1.1), the non 2,3,7,8-substituted compounds, and to the
determination of labeled compounds for intralaboratory statistics
(Sections 9.4 and 15.5.4).
10.6.1 Response factors--Calibration requires the determination of
response factors (RF) defined by the following equation:
[GRAPHIC] [TIFF OMITTED] TR15SE97.003
where:
A1s and A2s = The areas of the primary and
secondary m/z's for the CDD/CDF.
A1is and A2is = The areas of the primary and
secondary m/z's for the internal standard.
Cis = The concentration of the internal standard (Table 4).
Cs = The concentration of the compound in the calibration
standard (Table 4).
Note: There is only one m/z for \37\Cl4-2,3,7,8-TCDD. See
Table 8.
10.6.2 To calibrate the analytical system by internal standard,
inject 1.0 [micro]L or 2.0 [micro]L of calibration standards CS1 through
CS5 (Section 7.13 and Table 4) using the procedure in Section 14 and the
conditions in Section 10.1.1 and Table 2. Compute the response factor
(RF) at each concentration.
10.6.3 Linearity--If the response factor (RF) for any compound is
constant (less than 35% coefficient of variation) over the five-point
calibration range, an averaged response factor may be used for that
compound; otherwise, the complete calibration curve for that compound
shall be used over the five-point range.
10.7 Combined Calibration--By using calibration solutions (Section
7.13 and Table 4) containing the CDDs/CDFs and labeled compounds and the
internal standards, a single set of analyses can be used to produce
calibration curves for the isotope dilution and internal standard
methods. These curves are verified each shift (Section 15.3) by
analyzing the calibration verification standard (VER, Table 4).
Recalibration is required if any of the calibration verification
criteria (Section 15.3) cannot be met.
10.8 Data Storage--MS data shall be collected, recorded, and stored.
10.8.1 Data acquisition--The signal at each exact m/z shall be
collected repetitively throughout the monitoring period and stored on a
mass storage device.
10.8.2 Response factors and multipoint calibrations--The data system
shall be used to record and maintain lists of response factors (response
ratios for isotope dilution) and multipoint calibration curves.
Computations of relative standard deviation (coefficient of variation)
shall be used to test calibration linearity. Statistics on initial
performance (Section 9.2) and ongoing performance (Section 15.5) should
be computed and maintained, either on the instrument data system, or on
a separate computer system.
11.0 Sample Preparation
11.1 Sample preparation involves modifying the physical form of the
sample so that the CDDs/CDFs can be extracted efficiently. In general,
the samples must be in a liquid form or in the form of finely divided
solids in order for efficient extraction to take place. Table 10 lists
the phases and suggested quantities for extraction of various sample
matrices.
For samples known or expected to contain high levels of the CDDs/
CDFs, the smallest sample size representative of the entire sample
should be used (see Section 17.5).
For all samples, the blank and IPR/OPR aliquots must be processed
through the same steps as the sample to check for contamination and
losses in the preparation processes.
11.1.1 For samples that contain particles, percent solids and
particle size are determined using the procedures in Sections 11.2 and
11.3, respectively.
11.1.2 Aqueous samples--Because CDDs/CDFs may be bound to suspended
particles, the preparation of aqueous samples is dependent on the solids
content of the sample.
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11.1.2.1 Aqueous samples visibly absent particles are prepared per
Section 11.4 and extracted directly using the separatory funnel or SPE
techniques in Sections 12.1 or 12.2, respectively.
11.1.2.2 Aqueous samples containing visible particles and containing
one percent suspended solids or less are prepared using the procedure in
Section 11.4. After preparation, the sample is extracted directly using
the SPE technique in 12.2 or filtered per Section 11.4.3. After
filtration, the particles and filter are extracted using the SDS
procedure in Section 12.3 and the filtrate is extracted using the
separatory funnel procedure in Section 12.1.
11.1.2.3 For aqueous samples containing greater than one percent
solids, a sample aliquot sufficient to provide 10 g of dry solids is
used, as described in Section 11.5.
11.1.3 Solid samples are prepared using the procedure described in
Section 11.5 followed by extraction via the SDS procedure in Section
12.3.
11.1.4 Multiphase samples--The phase(s) containing the CDDs/CDFs is
separated from the non-CDD/CDF phase using pressure filtration and
centrifugation, as described in Section 11.6. The CDDs/CDFs will be in
the organic phase in a multiphase sample in which an organic phase
exists.
11.1.5 Procedures for grinding, homogenization, and blending of
various sample phases are given in Section 11.7.
11.1.6 Tissue samples--Preparation procedures for fish and other
tissues are given in Section 11.8.
11.2 Determination of Percent Suspended Solids.
Note: This aliquot is used for determining the solids content of the
sample, not for determination of CDDs/CDFs.
11.2.1 Aqueous liquids and multi-phase samples consisting of mainly
an aqueous phase.
11.2.1.1 Dessicate and weigh a GF/D filter (Section 6.5.3) to three
significant figures.
11.2.1.2 Filter 10.0 0.02 mL of well-mixed
sample through the filter.
11.2.1.3 Dry the filter a minimum of 12 hours at 110 5 [deg]C and cool in a dessicator.
11.2.1.4 Calculate percent solids as follows:
[GRAPHIC] [TIFF OMITTED] TR15SE97.004
11.2.2 Non-aqueous liquids, solids, semi-solid samples, and multi-
phase samples in which the main phase is not aqueous; but not tissues.
11.2.2.1 Weigh 5-10 g of sample to three significant figures in a
tared beaker.
11.2.2.2 Dry a minimum of 12 hours at 110 5
[deg]C, and cool in a dessicator.
11.2.2.3 Calculate percent solids as follows:
[GRAPHIC] [TIFF OMITTED] TR15SE97.005
11.3 Determination of Particle Size.
11.3.1 Spread the dried sample from Section 11.2.2.2 on a piece of
filter paper or aluminum foil in a fume hood or glove box.
11.3.2 Estimate the size of the particles in the sample. If the size
of the largest particles is greater than 1 mm, the particle size must be
reduced to 1 mm or less prior to extraction using the procedures in
Section 11.7.
11.4 Preparation of Aqueous Samples Containing 1% Suspended Solids
or Less.
11.4.1 Aqueous samples visibly absent particles are prepared per the
procedure below and extracted directly using the separatory funnel or
SPE techniques in Sections 12.1 or 12.2, respectively. Aqueous samples
containing visible particles and one percent suspended solids or less
are prepared using the procedure below and extracted using either the
SPE technique in Section 12.2 or further prepared using the filtration
procedure in Section 11.4.3. The filtration procedure is followed by SDS
extraction of the filter and particles (Section 12.3) and separatory
funnel extraction of the filtrate (Section 12.1). The SPE procedure is
followed by SDS extraction of the filter and disk.
11.4.2 Preparation of sample and QC aliquots.
11.4.2.1 Mark the original level of the sample on the sample bottle
for reference. Weigh the sample plus bottle to 1.
[[Page 277]]
11.4.2.2 Spike 1.0 mL of the diluted labeled-compound spiking
solution (Section 7.10.3) into the sample bottle. Cap the bottle and mix
the sample by careful shaking. Allow the sample to equilibrate for one
to two hours, with occasional shaking.
11.4.2.3 For each sample or sample batch (to a maximum of 20
samples) to be extracted during the same 12-hour shift, place two 1.0 L
aliquots of reagent water in clean sample bottles or flasks.
11.4.2.4 Spike 1.0 mL of the diluted labeled-compound spiking
solution (Section 7.10.3) into both reagent water aliquots. One of these
aliquots will serve as the method blank.
11.4.2.5 Spike 1.0 mL of the PAR standard (Section 7.14) into the
remaining reagent water aliquot. This aliquot will serve as the OPR
(Section 15.5).
11.4.2.6 If SPE is to be used, add 5 mL of methanol to the sample,
cap and shake the sample to mix thoroughly, and proceed to Section 12.2
for extraction. If SPE is not to be used, and the sample is visibly
absent particles, proceed to Section 12.1 for extraction. If SPE is not
to be used and the sample contains visible particles, proceed to the
following section for filtration of particles.
11.4.3 Filtration of particles.
11.4.3.1 Assemble a Buchner funnel (Section 6.5.5) on top of a clean
filtration flask. Apply vacuum to the flask, and pour the entire
contents of the sample bottle through a glass-fiber filter (Section
6.5.6) in the Buchner funnel, swirling the sample remaining in the
bottle to suspend any particles.
11.4.3.2 Rinse the sample bottle twice with approximately 5 mL
portions of reagent water to transfer any remaining particles onto the
filter.
11.4.3.3 Rinse any particles off the sides of the Buchner funnel
with small quantities of reagent water.
11.4.3.4 Weigh the empty sample bottle to 1 g.
Determine the weight of the sample by difference. Save the bottle for
further use.
11.4.3.5 Extract the filtrate using the separatory funnel procedure
in Section 12.1.
11.4.3.6 Extract the filter containing the particles using the SDS
procedure in Section 12.3.
11.5 Preparation of Samples Containing Greater Than 1% Solids.
11.5.1 Weigh a well-mixed aliquot of each sample (of the same matrix
type) sufficient to provide 10 g of dry solids (based on the solids
determination in Section 11.2) into a clean beaker or glass jar.
11.5.2 Spike 1.0 mL of the diluted labeled compound spiking solution
(Section 7.10.3) into the sample.
11.5.3 For each sample or sample batch (to a maximum of 20 samples)
to be extracted during the same 12-hour shift, weigh two 10 g aliquots
of the appropriate reference matrix (Section 7.6) into clean beakers or
glass jars.
11.5.4 Spike 1.0 mL of the diluted labeled compound spiking solution
(Section 7.10.3) into each reference matrix aliquot. One aliquot will
serve as the method blank. Spike 1.0 mL of the PAR standard (Section
7.14) into the other reference matrix aliquot. This aliquot will serve
as the OPR (Section 15.5).
11.5.5 Stir or tumble and equilibrate the aliquots for one to two
hours.
11.5.6 Decant excess water. If necessary to remove water, filter the
sample through a glass-fiber filter and discard the aqueous liquid.
11.5.7 If particles 1mm are present in the sample (as
determined in Section 11.3.2), spread the sample on clean aluminum foil
in a hood. After the sample is dry, grind to reduce the particle size
(Section 11.7).
11.5.8 Extract the sample and QC aliquots using the SDS procedure in
Section 12.3.
11.6 Multiphase Samples.
11.6.1 Using the percent solids determined in Section 11.2.1 or
11.2.2, determine the volume of sample that will provide 10 g of solids,
up to 1 L of sample.
11.6.2 Pressure filter the amount of sample determined in Section
11.6.1 through Whatman GF/D glass-fiber filter paper (Section 6.5.3).
Pressure filter the blank and OPR aliquots through GF/D papers also. If
necessary to separate the phases and/or settle the solids, centrifuge
these aliquots prior to filtration.
11.6.3 Discard any aqueous phase (if present). Remove any non-
aqueous liquid present and reserve the maximum amount filtered from the
sample (Section 11.6.1) or 10 g, whichever is less, for combination with
the solid phase (Section 12.3.5).
11.6.4 If particles 1mm are present in the sample (as
determined in Section 11.3.2) and the sample is capable of being dried,
spread the sample and QC aliquots on clean aluminum foil in a hood.
After the aliquots are dry or if the sample cannot be dried, reduce the
particle size using the procedures in Section 11.7 and extract the
reduced particles using the SDS procedure in Section 12.3. If particles
1mm are not present, extract the particles and filter in the
sample and QC aliquots directly using the SDS procedure in Section 12.3.
11.7 Sample grinding, homogenization, or blending--Samples with
particle sizes greater than 1 mm (as determined in Section 11.3.2) are
subjected to grinding, homogenization, or blending. The method of
reducing particle size to less than 1 mm is matrix-dependent. In
general, hard particles can be reduced by grinding with a mortar and
pestle. Softer particles can be reduced by grinding in a Wiley mill or
meat grinder, by homogenization, or in a blender.
11.7.1 Each size-reducing preparation procedure on each matrix shall
be verified by running the tests in Section 9.2 before the procedure is
employed routinely.
[[Page 278]]
11.7.2 The grinding, homogenization, or blending procedures shall be
carried out in a glove box or fume hood to prevent particles from
contaminating the work environment.
11.7.3 Grinding--Certain papers and pulps, slurries, and amorphous
solids can be ground in a Wiley mill or heavy duty meat grinder. In some
cases, reducing the temperature of the sample to freezing or to dry ice
or liquid nitrogen temperatures can aid in the grinding process. Grind
the sample aliquots from Section 11.5.7 or 11.6.4 in a clean grinder. Do
not allow the sample temperature to exceed 50 [deg]C. Grind the blank
and reference matrix aliquots using a clean grinder.
11.7.4 Homogenization or blending--Particles that are not ground
effectively, or particles greater than 1 mm in size after grinding, can
often be reduced in size by high speed homogenization or blending.
Homogenize and/or blend the particles or filter from Section 11.5.7 or
11.6.4 for the sample, blank, and OPR aliquots.
11.7.5 Extract the aliquots using the SDS procedure in Section 12.3.
11.8 Fish and Other Tissues--Prior to processing tissue samples, the
laboratory must determine the exact tissue to be analyzed. Common
requests for analysis of fish tissue include whole fish--skin on, whole
fish--skin removed, edible fish fillets (filleted in the field or by the
laboratory), specific organs, and other portions. Once the appropriate
tissue has been determined, the sample must be homogenized.
11.8.1 Homogenization.
11.8.1.1 Samples are homogenized while still frozen, where
practical. If the laboratory must dissect the whole fish to obtain the
appropriate tissue for analysis, the unused tissues may be rapidly
refrozen and stored in a clean glass jar for subsequent use.
11.8.1.2 Each analysis requires 10 g of tissue (wet weight).
Therefore, the laboratory should homogenize at least 20 g of tissue to
allow for re-extraction of a second aliquot of the same homogenized
sample, if re-analysis is required. When whole fish analysis is
necessary, the entire fish is homogenized.
11.8.1.3 Homogenize the sample in a tissue homogenizer (Section
6.3.3) or grind in a meat grinder (Section 6.3.4). Cut tissue too large
to feed into the grinder into smaller pieces. To assure homogeneity,
grind three times.
11.8.1.4 Transfer approximately 10 g (wet weight) of homogenized
tissue to a clean, tared, 400-500 mL beaker. For the alternate HCl
digestion/extraction, transfer the tissue to a clean, tared 500-600 mL
wide-mouth bottle. Record the weight to the nearest 10 mg.
11.8.1.5 Transfer the remaining homogenized tissue to a clean jar
with a fluoropolymer-lined lid. Seal the jar and store the tissue at <-
10 [deg]C. Return any tissue that was not homogenized to its original
container and store at <-10 [deg]C.
11.8.2 QC aliquots.
11.8.2.1 Prepare a method blank by adding approximately 10 g of the
oily liquid reference matrix (Section 7.6.4) to a 400-500 mL beaker. For
the alternate HCl digestion/extraction, add the reference matrix to a
500-600 mL wide-mouth bottle. Record the weight to the nearest 10 mg.
11.8.2.2 Prepare a precision and recovery aliquot by adding
approximately 10 g of the oily liquid reference matrix (Section 7.6.4)
to a separate 400-500 mL beaker or wide-mouth bottle, depending on the
extraction procedure to be used. Record the weight to the nearest 10 mg.
If the initial precision and recovery test is to be performed, use four
aliquots; if the ongoing precision and recovery test is to be performed,
use a single aliquot.
11.8.3 Spiking
11.8.3.1 Spike 1.0 mL of the labeled compound spiking solution
(Section 7.10.3) into the sample, blank, and OPR aliquot.
11.8.3.2 Spike 1.0 mL of the PAR standard (Section 7.14) into the
OPR aliquot.
11.8.4 Extract the aliquots using the procedures in Section 12.4.
12.0 Extraction and Concentration
Extraction procedures include separatory funnel (Section 12.1) and
solid phase (Section 12.2) for aqueous liquids; Soxhlet/Dean-Stark
(Section 12.3) for solids, filters, and SPE disks; and Soxhlet
extraction (Section 12.4.1) and HCl digestion (Section 12.4.2) for
tissues. Acid/base back-extraction (Section 12.5) is used for initial
cleanup of extracts.
Macro-concentration procedures include rotary evaporation (Section
12.6.1), heating mantle (Section 12.6.2), and Kuderna-Danish (K-D)
evaporation (Section 12.6.3). Micro-concentration uses nitrogen blowdown
(Section 12.7).
12.1 Separatory funnel extraction of filtrates and of aqueous
samples visibly absent particles.
12.1.1 Pour the spiked sample (Section 11.4.2.2) or filtrate
(Section 11.4.3.5) into a 2 L separatory funnel. Rinse the bottle or
flask twice with 5 mL of reagent water and add these rinses to the
separatory funnel.
12.1.2 Add 60 mL methylene chloride to the empty sample bottle
(Section 12.1.1), seal, and shake 60 seconds to rinse the inner surface.
Transfer the solvent to the separatory funnel, and extract the sample by
shaking the funnel for two minutes with periodic venting. Allow the
organic layer to separate from the aqueous phase for a minimum of 10
minutes. If an emulsion forms and is more than one-third the volume of
the solvent layer, employ mechanical techniques to complete the phase
separation (see note below). Drain the methylene chloride extract
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through a solvent-rinsed glass funnel approximately one-half full of
granular anhydrous sodium sulfate (Section 7.2.1) supported on clean
glass-fiber paper into a solvent-rinsed concentration device (Section
12.6).
Note: If an emulsion forms, the analyst must employ mechanical
techniques to complete the phase separation. The optimum technique
depends upon the sample, but may include stirring, filtration through
glass wool, use of phase separation paper, centrifugation, use of an
ultrasonic bath with ice, addition of NaCl, or other physical methods.
Alternatively, solid-phase or other extraction techniques may be used to
prevent emulsion formation. Any alternative technique is acceptable so
long as the requirements in Section 9 are met.
Experience with aqueous samples high in dissolved organic materials
(e.g., paper mill effluents) has shown that acidification of the sample
prior to extraction may reduce the formation of emulsions. Paper
industry methods suggest that the addition of up to 400 mL of ethanol to
a 1 L effluent sample may also reduce emulsion formation. However,
studies by EPA suggest that the effect may be a result of sample
dilution, and that the addition of reagent water may serve the same
function. Mechanical techniques may still be necessary to complete the
phase separation. If either acidification or addition of ethanol is
utilized, the laboratory must perform the startup tests described in
Section 9.2 using the same techniques.
12.1.3 Extract the water sample two more times with 60 mL portions
of methylene chloride. Drain each portion through the sodium sulfate
into the concentrator. After the third extraction, rinse the separatory
funnel with at least 20 mL of methylene chloride, and drain this rinse
through the sodium sulfate into the concentrator. Repeat this rinse at
least twice. Set aside the funnel with sodium sulfate if the extract is
to be combined with the extract from the particles.
12.1.4 Concentrate the extract using one of the macro-concentration
procedures in Section 12.6.
12.1.4.1 If the extract is from a sample visibly absent particles
(Section 11.1.2.1), adjust the final volume of the concentrated extract
to approximately 10 mL with hexane, transfer to a 250 mL separatory
funnel, and back-extract using the procedure in Section 12.5.
12.1.4.2 If the extract is from the aqueous filtrate (Section
11.4.3.5), set aside the concentration apparatus for addition of the SDS
extract from the particles (Section 12.3.9.1.2).
12.2 SPE of Samples Containing Less Than 1% Solids (References 19-
20).
12.2.1 Disk preparation.
12.2.1.1 Place an SPE disk on the base of the filter holder (Figure
4) and wet with toluene. While holding a GMF 150 filter above the SPE
disk with tweezers, wet the filter with toluene and lay the filter on
the SPE disk, making sure that air is not trapped between the filter and
disk. Clamp the filter and SPE disk between the 1 L glass reservoir and
the vacuum filtration flask.
12.2.1.2 Rinse the sides of the filtration flask with approx 15 mL
of toluene using a squeeze bottle or syringe. Apply vacuum momentarily
until a few drops appear at the drip tip. Release the vacuum and allow
the filter/disk to soak for approx one minute. Apply vacuum and draw all
of the toluene through the filter/disk. Repeat the wash step with approx
15 mL of acetone and allow the filter/disk to air dry.
12.2.1.3 Re-wet the filter/disk with approximately 15 mL of
methanol, allowing the filter/disk to soak for approximately one minute.
Pull the methanol through the filter/disk using the vacuum, but retain a
layer of methanol approximately 1 mm thick on the filter. Do not allow
the disk to go dry from this point until the end of the extraction.
12.2.1.4 Rinse the filter/disk with two 50-mL portions of reagent
water by adding the water to the reservoir and pulling most through,
leaving a layer of water on the surface of the filter.
12.2.2 Extraction.
12.2.2.1 Pour the spiked sample (Section 11.4.2.2), blank (Section
11.4.2.4), or IPR/OPR aliquot (Section 11.4.2.5) into the reservoir and
turn on the vacuum to begin the extraction. Adjust the vacuum to
complete the extraction in no less than 10 minutes. For samples
containing a high concentration of particles (suspended solids),
filtration times may be eight hours or longer.
12.2.2.2 Before all of the sample has been pulled through the
filter/disk, rinse the sample bottle with approximately 50 mL of reagent
water to remove any solids, and pour into the reservoir. Pull through
the filter/disk. Use additional reagent water rinses until all visible
solids are removed.
12.2.2.3 Before all of the sample and rinses have been pulled
through the filter/disk, rinse the sides of the reservoir with small
portions of reagent water.
12.2.2.4 Allow the filter/disk to dry, then remove the filter and
disk and place in a glass Petri dish. Extract the filter and disk per
Section 12.3.
12.3 SDS Extraction of Samples Containing Particles, and of Filters
and/or Disks.
12.3.1 Charge a clean extraction thimble (Section 6.4.2.2) with 5.0
g of 100/200 mesh silica (Section 7.5.1.1) topped with 100 g of quartz
sand (Section 7.3.2).
Note: Do not disturb the silica layer throughout the extraction
process.
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12.3.2 Place the thimble in a clean extractor. Place 30-40 mL of
toluene in the receiver and 200-250 mL of toluene in the flask.
12.3.3 Pre-extract the glassware by heating the flask until the
toluene is boiling. When properly adjusted, one to two drops of toluene
will fall per second from the condenser tip into the receiver. Extract
the apparatus for a minimum of three hours.
12.3.4 After pre-extraction, cool and disassemble the apparatus.
Rinse the thimble with toluene and allow to air dry.
12.3.5 Load the wet sample, filter, and/or disk from Section
11.4.3.6, 11.5.8, 11.6.4, 11.7.3, 11.7.4, or 12.2.2.4 and any nonaqueous
liquid from Section 11.6.3 into the thimble and manually mix into the
sand layer with a clean metal spatula, carefully breaking up any large
lumps of sample.
12.3.6 Reassemble the pre-extracted SDS apparatus, and add a fresh
charge of toluene to the receiver and reflux flask. Apply power to the
heating mantle to begin refluxing. Adjust the reflux rate to match the
rate of percolation through the sand and silica beds until water removal
lessens the restriction to toluene flow. Frequently check the apparatus
for foaming during the first two hours of extraction. If foaming occurs,
reduce the reflux rate until foaming subsides.
12.3.7 Drain the water from the receiver at one to two hours and
eight to nine hours, or sooner if the receiver fills with water. Reflux
the sample for a total of 16-24 hours. Cool and disassemble the
apparatus. Record the total volume of water collected.
12.3.8 Remove the distilling flask. Drain the water from the Dean-
Stark receiver and add any toluene in the receiver to the extract in the
flask.
12.3.9 Concentrate the extract using one of the macro-concentration
procedures in Section 12.6 per the following:
12.3.9.1 Extracts from the particles in an aqueous sample containing
less than 1% solids (Section 11.4.3.6).
12.3.9.1.1 Concentrate the extract to approximately 5 mL using the
rotary evaporator or heating mantle procedures in Section 12.6.1 or
12.6.2.
12.3.9.1.2 Quantitatively transfer the extract through the sodium
sulfate (Section 12.1.3) into the apparatus that was set aside (Section
12.1.4.2) and reconcentrate to the level of the toluene.
12.3.9.1.3 Adjust to approximately 10 mL with hexane, transfer to a
250 mL separatory funnel, and proceed with back-extraction (Section
12.5).
12.3.9.2 Extracts from particles (Sections 11.5 through 11.6) or
from the SPE filter and disk (Section 12.2.2.4)--Concentrate to
approximately 10 mL using the rotary evaporator or heating mantle
(Section 12.6.1 or 12.6.2), transfer to a 250 mL separatory funnel, and
proceed with back-extraction (Section 12.5).
12.4 Extraction of Tissue--Two procedures are provided for tissue
extraction.
12.4.1 Soxhlet extraction (Reference 21).
12.4.1.1 Add 30-40 g of powdered anhydrous sodium sulfate to each of
the beakers (Section 11.8.4) and mix thoroughly. Cover the beakers with
aluminum foil and allow to equilibrate for 12-24 hours. Remix prior to
extraction to prevent clumping.
12.4.1.2 Assemble and pre-extract the Soxhlet apparatus per Sections
12.3.1 through 12.3.4, except use the methylene chloride:hexane (1:1)
mixture for the pre-extraction and rinsing and omit the quartz sand. The
Dean-Stark moisture trap may also be omitted, if desired.
12.4.1.3 Reassemble the pre-extracted Soxhlet apparatus and add a
fresh charge of methylene chloride:hexane to the reflux flask.
12.4.1.4 Transfer the sample/sodium sulfate mixture (Section
12.4.1.1) to the Soxhlet thimble, and install the thimble in the Soxhlet
apparatus.
12.4.1.5 Rinse the beaker with several portions of solvent mixture
and add to the thimble. Fill the thimble/receiver with solvent. Extract
for 18-24 hours.
12.4.1.6 After extraction, cool and disassemble the apparatus.
12.4.1.7 Quantitatively transfer the extract to a macro-
concentration device (Section 12.6), and concentrate to near dryness.
Set aside the concentration apparatus for re-use.
12.4.1.8 Complete the removal of the solvent using the nitrogen
blowdown procedure (Section 12.7) and a water bath temperature of 60
[deg]C. Weigh the receiver, record the weight, and return the receiver
to the blowdown apparatus, concentrating the residue until a constant
weight is obtained.
12.4.1.9 Percent lipid determination--The lipid content is
determined by extraction of tissue with the same solvent system
(methylene chloride:hexane) that was used in EPA's National Dioxin Study
(Reference 22) so that lipid contents are consistent with that study.
12.4.1.9.1 Redissolve the residue in the receiver in hexane and
spike 1.0 mL of the cleanup standard (Section 7.11) into the solution.
12.4.1.9.2 Transfer the residue/hexane to the anthropogenic
isolation column (Section 13.7.1) or bottle for the acidified silica gel
batch cleanup (Section 13.7.2), retaining the boiling chips in the
concentration apparatus. Use several rinses to assure that all material
is transferred. If necessary, sonicate or heat the receiver slightly to
assure that all material is re-dissolved. Allow the receiver to dry.
Weigh the receiver and boiling chips.
12.4.1.9.3 Calculate the lipid content to the nearest three
significant figures as follows:
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[GRAPHIC] [TIFF OMITTED] TR15SE97.006
12.4.1.9.4 It is not necessary to determine the lipid content of the
blank, IPR, or OPR aliquots.
12.4.2 HCl digestion/extraction and concentration (References 23-
26).
12.4.2.1 Add 200 mL of 6 N HCl and 200 mL of methylene
chloride:hexane (1:1) to the sample and QC aliquots (Section 11.8.4).
12.4.2.2 Cap and shake each bottle one to three times. Loosen the
cap in a hood to vent excess pressure. Shake each bottle for 10-30
seconds and vent.
12.4.2.3 Tightly cap and place on shaker. Adjust the shaker action
and speed so that the acid, solvent, and tissue are in constant motion.
However, take care to avoid such violent action that the bottle may be
dislodged from the shaker. Shake for 12-24 hours.
12.4.2.4 After digestion, remove the bottles from the shaker. Allow
the bottles to stand so that the solvent and acid layers separate.
12.4.2.5 Decant the solvent through a glass funnel with glass-fiber
filter (Sections 6.5.2 through 6.5.3) containing approximately 10 g of
granular anhydrous sodium sulfate (Section 7.2.1) into a macro-
concentration apparatus (Section 12.6). Rinse the contents of the bottle
with two 25 mL portions of hexane and pour through the sodium sulfate
into the apparatus.
12.4.2.6 Concentrate the solvent to near dryness using a macro-
concentration procedure (Section 12.6).
12.4.2.7 Complete the removal of the solvent using the nitrogen
blowdown apparatus (Section 12.7) and a water bath temperature of 60
[deg]C. Weigh the receiver, record the weight, and return the receiver
to the blowdown apparatus, concentrating the residue until a constant
weight is obtained.
12.4.2.8 Percent lipid determination--The lipid content is
determined in the same solvent system [methylene chloride:hexane (1:1)]
that was used in EPA's National Dioxin Study (Reference 22) so that
lipid contents are consistent with that study.
12.4.2.8.1 Redissolve the residue in the receiver in hexane and
spike 1.0 mL of the cleanup standard (Section 7.11) into the solution.
12.4.2.8.2 Transfer the residue/hexane to the narrow-mouth 100-200
mL bottle retaining the boiling chips in the receiver. Use several
rinses to assure that all material is transferred, to a maximum hexane
volume of approximately 70 mL. Allow the receiver to dry. Weigh the
receiver and boiling chips.
12.4.2.8.3 Calculate the percent lipid per Section 12.4.1.9.3. It is
not necessary to determine the lipid content of the blank, IPR, or OPR
aliquots.
12.4.2.9 Clean up the extract per Section 13.7.3.
12.5 Back-Extraction with Base and Acid.
12.5.1 Spike 1.0 mL of the cleanup standard (Section 7.11) into the
separatory funnels containing the sample and QC extracts from Section
12.1.4.1, 12.3.9.1.3, or 12.3.9.2.
12.5.2 Partition the extract against 50 mL of potassium hydroxide
solution (Section 7.1.1). Shake for two minutes with periodic venting
into a hood. Remove and discard the aqueous layer. Repeat the base
washing until no color is visible in the aqueous layer, to a maximum of
four washings. Minimize contact time between the extract and the base to
prevent degradation of the CDDs/CDFs. Stronger potassium hydroxide
solutions may be employed for back-extraction, provided that the
laboratory meets the specifications for labeled compound recovery and
demonstrates acceptable performance using the procedure in Section 9.2.
12.5.3 Partition the extract against 50 mL of sodium chloride
solution (Section 7.1.4) in the same way as with base. Discard the
aqueous layer.
12.5.4 Partition the extract against 50 mL of sulfuric acid (Section
7.1.2) in the same way as with base. Repeat the acid washing until no
color is visible in the aqueous layer, to a maximum of four washings.
12.5.5 Repeat the partitioning against sodium chloride solution and
discard the aqueous layer.
12.5.6 Pour each extract through a drying column containing 7-10 cm
of granular anhydrous sodium sulfate (Section 7.2.1). Rinse the
separatory funnel with 30-50 mL of solvent, and pour through the drying
column. Collect each extract in a round-bottom flask. Re-concentrate the
sample and QC aliquots per Sections 12.6 through 12.7, and clean up the
samples and QC aliquots per Section 13.
12.6 Macro-Concentration--Extracts in toluene are concentrated using
a rotary evaporator or a heating mantle; extracts in methylene chloride
or hexane are concentrated using a rotary evaporator, heating mantle, or
Kuderna-Danish apparatus.
12.6.1 Rotary evaporation--Concentrate the extracts in separate
round-bottom flasks.
12.6.1.1 Assemble the rotary evaporator according to manufacturer's
instructions, and warm the water bath to 45 [deg]C. On a daily basis,
preclean the rotary evaporator by concentrating 100 mL of clean
extraction solvent through the system. Archive both the concentrated
solvent and the solvent in the catch flask for a contamination check if
necessary. Between samples, three 2-3 mL aliquots of solvent should be
rinsed down the feed tube into a waste beaker.
12.6.1.2 Attach the round-bottom flask containing the sample extract
to the rotary evaporator. Slowly apply vacuum to the system, and begin
rotating the sample flask.
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12.6.1.3 Lower the flask into the water bath, and adjust the speed
of rotation and the temperature as required to complete concentration in
15-20 minutes. At the proper rate of concentration, the flow of solvent
into the receiving flask will be steady, but no bumping or visible
boiling of the extract will occur.
Note: If the rate of concentration is too fast, analyte loss may
occur.
12.6.1.4 When the liquid in the concentration flask has reached an
apparent volume of approximately 2 mL, remove the flask from the water
bath and stop the rotation. Slowly and carefully admit air into the
system. Be sure not to open the valve so quickly that the sample is
blown out of the flask. Rinse the feed tube with approximately 2 mL of
solvent.
12.6.1.5 Proceed to Section 12.6.4 for preparation for back-
extraction or micro-concentration and solvent exchange.
12.6.2 Heating mantle--Concentrate the extracts in separate round-
bottom flasks.
12.6.2.1 Add one or two clean boiling chips to the round-bottom
flask, and attach a three-ball macro Snyder column. Prewet the column by
adding approximately 1 mL of solvent through the top. Place the round-
bottom flask in a heating mantle, and apply heat as required to complete
the concentration in 15-20 minutes. At the proper rate of distillation,
the balls of the column will actively chatter, but the chambers will not
flood.
12.6.2.2 When the liquid has reached an apparent volume of
approximately 10 mL, remove the round-bottom flask from the heating
mantle and allow the solvent to drain and cool for at least 10 minutes.
Remove the Snyder column and rinse the glass joint into the receiver
with small portions of solvent.
12.6.2.3 Proceed to Section 12.6.4 for preparation for back-
extraction or micro-concentration and solvent exchange.
12.6.3 Kuderna-Danish (K-D)--Concentrate the extracts in separate
500 mL K-D flasks equipped with 10 mL concentrator tubes. The K-D
technique is used for solvents such as methylene chloride and hexane.
Toluene is difficult to concentrate using the K-D technique unless a
water bath fed by a steam generator is used.
12.6.3.1 Add one to two clean boiling chips to the receiver. Attach
a three-ball macro Snyder column. Prewet the column by adding
approximately 1 mL of solvent through the top. Place the K-D apparatus
in a hot water bath so that the entire lower rounded surface of the
flask is bathed with steam.
12.6.3.2 Adjust the vertical position of the apparatus and the water
temperature as required to complete the concentration in 15-20 minutes.
At the proper rate of distillation, the balls of the column will
actively chatter but the chambers will not flood.
12.6.3.3 When the liquid has reached an apparent volume of 1 mL,
remove the K-D apparatus from the bath and allow the solvent to drain
and cool for at least 10 minutes. Remove the Snyder column and rinse the
flask and its lower joint into the concentrator tube with 1-2 mL of
solvent. A 5 mL syringe is recommended for this operation.
12.6.3.4 Remove the three-ball Snyder column, add a fresh boiling
chip, and attach a two-ball micro Snyder column to the concentrator
tube. Prewet the column by adding approximately 0.5 mL of solvent
through the top. Place the apparatus in the hot water bath.
12.6.3.5 Adjust the vertical position and the water temperature as
required to complete the concentration in 5-10 minutes. At the proper
rate of distillation, the balls of the column will actively chatter but
the chambers will not flood.
12.6.3.6 When the liquid reaches an apparent volume of 0.5 mL,
remove the apparatus from the water bath and allow to drain and cool for
at least 10 minutes.
12.6.3.7 Proceed to 12.6.4 for preparation for back-extraction or
micro-concentration and solvent exchange.
12.6.4 Preparation for back-extraction or micro-concentration and
solvent exchange.
12.6.4.1 For back-extraction (Section 12.5), transfer the extract to
a 250 mL separatory funnel. Rinse the concentration vessel with small
portions of hexane, adjust the hexane volume in the separatory funnel to
10-20 mL, and proceed to back-extraction (Section 12.5).
12.6.4.2 For determination of the weight of residue in the extract,
or for clean-up procedures other than back-extraction, transfer the
extract to a blowdown vial using two to three rinses of solvent. Proceed
with micro-concentration and solvent exchange (Section 12.7).
12.7 Micro-Concentration and Solvent Exchange.
12.7.1 Extracts to be subjected to GPC or HPLC cleanup are exchanged
into methylene chloride. Extracts to be cleaned up using silica gel,
alumina, carbon, and/or Florisil are exchanged into hexane.
12.7.2 Transfer the vial containing the sample extract to a nitrogen
blowdown device. Adjust the flow of nitrogen so that the surface of the
solvent is just visibly disturbed.
Note: A large vortex in the solvent may cause analyte loss.
12.7.3 Lower the vial into a 45 [deg]C water bath and continue
concentrating.
12.7.3.1 If the extract is to be concentrated to dryness for weight
determination (Sections 12.4.1.8, 12.4.2.7, and 13.7.1.4), blow dry
until a constant weight is obtained.
12.7.3.2 If the extract is to be concentrated for injection into the
GC/MS or the
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solvent is to be exchanged for extract cleanup, proceed as follows:
12.7.4 When the volume of the liquid is approximately 100 L, add 2-3
mL of the desired solvent (methylene chloride for GPC and HPLC, or
hexane for the other cleanups) and continue concentration to
approximately 100 [micro]L. Repeat the addition of solvent and
concentrate once more.
12.7.5 If the extract is to be cleaned up by GPC, adjust the volume
of the extract to 5.0 mL with methylene chloride. If the extract is to
be cleaned up by HPLC, further concentrate the extract to 30 [micro]L.
Proceed with GPC or HPLC cleanup (Section 13.2 or 13.6, respectively).
12.7.6 If the extract is to be cleaned up by column chromatography
(alumina, silica gel, Carbopak/Celite, or Florisil), bring the final
volume to 1.0 mL with hexane. Proceed with column cleanups (Sections
13.3 through 13.5 and 13.8).
12.7.7 If the extract is to be concentrated for injection into the
GC/MS (Section 14), quantitatively transfer the extract to a 0.3 mL
conical vial for final concentration, rinsing the larger vial with
hexane and adding the rinse to the conical vial. Reduce the volume to
approximately 100 [micro]L. Add 10 [micro]L of nonane to the vial, and
evaporate the solvent to the level of the nonane. Seal the vial and
label with the sample number. Store in the dark at room temperature
until ready for GC/MS analysis. If GC/MS analysis will not be performed
on the same day, store the vial at <-10 [deg]C.
13.0 Extract Cleanup
13.1 Cleanup may not be necessary for relatively clean samples
(e.g., treated effluents, groundwater, drinking water). If particular
circumstances require the use of a cleanup procedure, the analyst may
use any or all of the procedures below or any other appropriate
procedure. Before using a cleanup procedure, the analyst must
demonstrate that the requirements of Section 9.2 can be met using the
cleanup procedure. If only 2,3,7,8-TCDD and 2,3,7,8-TCDF are to be
determined, the cleanup procedures may be optimized for isolation of
these two compounds.
13.1.1 Gel permeation chromatography (Section 13.2) removes high
molecular weight interferences that cause GC column performance to
degrade. It should be used for all soil and sediment extracts and may be
used for water extracts that are expected to contain high molecular
weight organic compounds (e.g., polymeric materials, humic acids).
13.1.2 Acid, neutral, and basic silica gel (Section 13.3), alumina
(Section 13.4), and Florisil (Section 13.8) are used to remove nonpolar
and polar interferences. Alumina and Florisil are used to remove
chlorodiphenyl ethers.
13.1.3 Carbopak/Celite (Section 13.5) is used to remove nonpolar
interferences.
13.1.4 HPLC (Section 13.6) is used to provide specificity for the
2,3,7,8-substituted and other CDD and CDF isomers.
13.1.5 The anthropogenic isolation column (Section 13.7.1),
acidified silica gel batch adsorption procedure (Section 13.7.2), and
sulfuric acid and base back-extraction (Section 13.7.3) are used for
removal of lipids from tissue samples.
13.2 Gel Permeation Chromatography (GPC).
13.2.1 Column packing.
13.2.1.1 Place 70-75 g of SX-3 Bio-beads (Section 6.7.1.1) in a 400-
500 mL beaker.
13.2.1.2 Cover the beads with methylene chloride and allow to swell
overnight (a minimum of 12 hours).
13.2.1.3 Transfer the swelled beads to the column (Section 6.7.1.1)
and pump solvent through the column, from bottom to top, at 4.5-5.5 mL/
minute prior to connecting the column to the detector.
13.2.1.4 After purging the column with solvent for one to two hours,
adjust the column head pressure to 7-10 psig and purge for four to five
hours to remove air. Maintain a head pressure of 7-10 psig. Connect the
column to the detector (Section 6.7.1.4).
13.2.2 Column calibration.
13.2.2.1 Load 5 mL of the calibration solution (Section 7.4) into
the sample loop.
13.2.2.2 Inject the calibration solution and record the signal from
the detector. The elution pattern will be corn oil, bis(2-ethyl
hexyl)phthalate, pentachlorophenol, perylene, and sulfur.
13.2.2.3 Set the ``dump time'' to allow 85% removal of
the corn oil and 85% collection of the phthalate.
13.2.2.4 Set the ``collect time'' to the peak minimum between
perylene and sulfur.
13.2.2.5 Verify the calibration with the calibration solution after
every 20 extracts. Calibration is verified if the recovery of the
pentachlorophenol is greater than 85%. If calibration is not verified,
the system shall be recalibrated using the calibration solution, and the
previous 20 samples shall be re-extracted and cleaned up using the
calibrated GPC system.
13.2.3 Extract cleanup--GPC requires that the column not be
overloaded. The column specified in this method is designed to handle a
maximum of 0.5 g of high molecular weight material in a 5 mL extract. If
the extract is known or expected to contain more than 0.5 g, the extract
is split into aliquots for GPC, and the aliquots are combined after
elution from the column. The residue content of the extract may be
obtained gravimetrically by evaporating the solvent from a 50 [micro]L
aliquot.
13.2.3.1 Filter the extract or load through the filter holder
(Section 6.7.1.3) to remove the particles. Load the 5.0 mL extract onto
the column.
[[Page 284]]
13.2.3.2 Elute the extract using the calibration data determined in
Section 13.2.2. Collect the eluate in a clean 400-500 mL beaker.
13.2.3.3 Rinse the sample loading tube thoroughly with methylene
chloride between extracts to prepare for the next sample.
13.2.3.4 If a particularly dirty extract is encountered, a 5.0 mL
methylene chloride blank shall be run through the system to check for
carry-over.
13.2.3.5 Concentrate the eluate per Sections 12.6 and 12.7 for
further cleanup or injection into the GC/MS.
13.3 Silica Gel Cleanup.
13.3.1 Place a glass-wool plug in a 15 mm ID chromatography column
(Section 6.7.4.2). Pack the column bottom to top with: 1 g silica gel
(Section 7.5.1.1), 4 g basic silica gel (Section 7.5.1.3), 1 g silica
gel, 8 g acid silica gel (Section 7.5.1.2), 2 g silica gel, and 4 g
granular anhydrous sodium sulfate (Section 7.2.1). Tap the column to
settle the adsorbents.
13.3.2 Pre-elute the column with 50-100 mL of hexane. Close the
stopcock when the hexane is within 1 mm of the sodium sulfate. Discard
the eluate. Check the column for channeling. If channeling is present,
discard the column and prepare another.
13.3.3 Apply the concentrated extract to the column. Open the
stopcock until the extract is within 1 mm of the sodium sulfate.
13.3.4 Rinse the receiver twice with 1 mL portions of hexane, and
apply separately to the column. Elute the CDDs/CDFs with 100 mL hexane,
and collect the eluate.
13.3.5 Concentrate the eluate per Sections 12.6 and 12.7 for further
cleanup or injection into the HPLC or GC/MS.
13.3.6 For extracts of samples known to contain large quantities of
other organic compounds (such as paper mill effluents), it may be
advisable to increase the capacity of the silica gel column. This may be
accomplished by increasing the strengths of the acid and basic silica
gels. The acid silica gel (Section 7.5.1.2) may be increased in strength
to as much as 44% w/w (7.9 g sulfuric acid added to 10 g silica gel).
The basic silica gel (Section 7.5.1.3) may be increased in strength to
as much as 33% w/w (50 mL 1N NaOH added to 100 g silica gel), or the
potassium silicate (Section 7.5.1.4) may be used.
Note: The use of stronger acid silica gel (44% w/w) may lead to
charring of organic compounds in some extracts. The charred material may
retain some of the analytes and lead to lower recoveries of CDDs/CDFs.
Increasing the strengths of the acid and basic silica gel may also
require different volumes of hexane than those specified above to elute
the analytes off the column. Therefore, the performance of the method
after such modifications must be verified by the procedure in Section
9.2.
13.4 Alumina Cleanup.
13.4.1 Place a glass-wool plug in a 15 mm ID chromatography column
(Section 6.7.4.2).
13.4.2 If using acid alumina, pack the column by adding 6 g acid
alumina (Section 7.5.2.1). If using basic alumina, substitute 6 g basic
alumina (Section 7.5.2.2). Tap the column to settle the adsorbents.
13.4.3 Pre-elute the column with 50-100 mL of hexane. Close the
stopcock when the hexane is within 1 mm of the alumina.
13.4.4 Discard the eluate. Check the column for channeling. If
channeling is present, discard the column and prepare another.
13.4.5 Apply the concentrated extract to the column. Open the
stopcock until the extract is within 1 mm of the alumina.
13.4.6 Rinse the receiver twice with 1 mL portions of hexane and
apply separately to the column. Elute the interfering compounds with 100
mL hexane and discard the eluate.
13.4.7 The choice of eluting solvents will depend on the choice of
alumina (acid or basic) made in Section 13.4.2.
13.4.7.1 If using acid alumina, elute the CDDs/CDFs from the column
with 20 mL methylene chloride:hexane (20:80 v/v). Collect the eluate.
13.4.7.2 If using basic alumina, elute the CDDs/CDFs from the column
with 20 mL methylene chloride:hexane (50:50 v/v). Collect the eluate.
13.4.8 Concentrate the eluate per Sections 12.6 and 12.7 for further
cleanup or injection into the HPLC or GC/MS.
13.5 Carbon Column.
13.5.1 Cut both ends from a 10 mL disposable serological pipet
(Section 6.7.3.2) to produce a 10 cm column. Fire-polish both ends and
flare both ends if desired. Insert a glass-wool plug at one end, and
pack the column with 0.55 g of Carbopak/Celite (Section 7.5.3.3) to form
an adsorbent bed approximately 2 cm long. Insert a glass-wool plug on
top of the bed to hold the adsorbent in place.
13.5.2 Pre-elute the column with 5 mL of toluene followed by 2 mL of
methylene chloride: methanol:toluene (15:4:1 v/v), 1 mL of methylene
chloride:cyclohexane (1:1 v/v), and 5 mL of hexane. If the flow rate of
eluate exceeds 0.5 mL/minute, discard the column.
13.5.3 When the solvent is within 1 mm of the column packing, apply
the sample extract to the column. Rinse the sample container twice with
1 mL portions of hexane and apply separately to the column. Apply 2 mL
of hexane to complete the transfer.
13.5.4 Elute the interfering compounds with two 3 mL portions of
hexane, 2 mL of methylene chloride:cyclohexane (1:1 v/v), and 2 mL of
methylene chloride:methanol:toluene (15:4:1 v/v). Discard the eluate.
13.5.5 Invert the column, and elute the CDDs/CDFs with 20 mL of
toluene. If carbon particles are present in the eluate, filter through
glass-fiber filter paper.
[[Page 285]]
13.5.6 Concentrate the eluate per Sections 12.6 and 12.7 for further
cleanup or injection into the HPLC or GC/MS.
13.6 HPLC (Reference 6).
13.6.1 Column calibration.
13.6.1.1 Prepare a calibration standard containing the 2,3,7,8-
substituted isomers and/or other isomers of interest at a concentration
of approximately 500 pg/[micro]L in methylene chloride.
13.6.1.2 Inject 30 [micro]L of the calibration solution into the
HPLC and record the signal from the detector. Collect the eluant for
reuse. The elution order will be the tetra- through octa-isomers.
13.6.1.3 Establish the collection time for the tetra-isomers and for
the other isomers of interest. Following calibration, flush the
injection system with copious quantities of methylene chloride,
including a minimum of five 50 [micro]L injections while the detector is
monitored, to ensure that residual CDDs/CDFs are removed from the
system.
13.6.1.4 Verify the calibration with the calibration solution after
every 20 extracts. Calibration is verified if the recovery of the CDDs/
CDFs from the calibration standard (Section 13.6.1.1) is 75-125%
compared to the calibration (Section 13.6.1.2). If calibration is not
verified, the system shall be recalibrated using the calibration
solution, and the previous 20 samples shall be re-extracted and cleaned
up using the calibrated system.
13.6.2 Extract cleanup--HPLC requires that the column not be
overloaded. The column specified in this method is designed to handle a
maximum of 30 [micro]L of extract. If the extract cannot be concentrated
to less than 30 [micro]L, it is split into fractions and the fractions
are combined after elution from the column.
13.6.2.1 Rinse the sides of the vial twice with 30 [micro]L of
methylene chloride and reduce to 30 [micro]L with the evaporation
apparatus (Section 12.7).
13.6.2.2 Inject the 30 [micro]L extract into the HPLC.
13.6.2.3 Elute the extract using the calibration data determined in
Section 13.6.1. Collect the fraction(s) in a clean 20 mL concentrator
tube containing 5 mL of hexane:acetone (1:1 v/v).
13.6.2.4 If an extract containing greater than 100 ng/mL of total
CDD or CDF is encountered, a 30 [micro]L methylene chloride blank shall
be run through the system to check for carry-over.
13.6.2.5 Concentrate the eluate per Section 12.7 for injection into
the GC/MS.
13.7 Cleanup of Tissue Lipids--Lipids are removed from the Soxhlet
extract using either the anthropogenic isolation column (Section 13.7.1)
or acidified silica gel (Section 13.7.2), or are removed from the HCl
digested extract using sulfuric acid and base back-extraction (Section
13.7.3).
13.7.1 Anthropogenic isolation column (References 22 and 27)--Used
for removal of lipids from the Soxhlet/SDS extraction (Section 12.4.1).
13.7.1.1 Prepare the column as given in Section 7.5.4.
13.7.1.2 Pre-elute the column with 100 mL of hexane. Drain the
hexane layer to the top of the column, but do not expose the sodium
sulfate.
13.7.1.3 Load the sample and rinses (Section 12.4.1.9.2) onto the
column by draining each portion to the top of the bed. Elute the CDDs/
CDFs from the column into the apparatus used for concentration (Section
12.4.1.7) using 200 mL of hexane.
13.7.1.4 Concentrate the cleaned up extract (Sections 12.6 through
12.7) to constant weight per Section 12.7.3.1. If more than 500 mg of
material remains, repeat the cleanup using a fresh anthropogenic
isolation column.
13.7.1.5 Redissolve the extract in a solvent suitable for the
additional cleanups to be used (Sections 13.2 through 13.6 and 13.8).
13.7.1.6 Spike 1.0 mL of the cleanup standard (Section 7.11) into
the residue/solvent.
13.7.1.7 Clean up the extract using the procedures in Sections 13.2
through 13.6 and 13.8. Alumina (Section 13.4) or Florisil (Section 13.8)
and carbon (Section 13.5) are recommended as minimum additional cleanup
steps.
13.7.1.8 Following cleanup, concentrate the extract to 10 [micro]L
as described in Section 12.7 and proceed with the analysis in Section
14.
13.7.2 Acidified silica gel (Reference 28)--Procedure alternate to
the anthropogenic isolation column (Section 13.7.1) that is used for
removal of lipids from the Soxhlet/SDS extraction (Section 12.4.1).
13.7.2.1 Adjust the volume of hexane in the bottle (Section
12.4.1.9.2) to approximately 200 mL.
13.7.2.2 Spike 1.0 mL of the cleanup standard (Section 7.11) into
the residue/solvent.
13.7.2.3 Drop the stirring bar into the bottle, place the bottle on
the stirring plate, and begin stirring.
13.7.2.4 Add 30-100 g of acid silica gel (Section 7.5.1.2) to the
bottle while stirring, keeping the silica gel in motion. Stir for two to
three hours.
Note: 30 grams of silica gel should be adequate for most samples and
will minimize contamination from this source.
13.7.2.5 After stirring, pour the extract through approximately 10 g
of granular anhydrous sodium sulfate (Section 7.2.1) contained in a
funnel with glass-fiber filter into a macro contration device (Section
12.6). Rinse the bottle and sodium sulfate with hexane to complete the
transfer.
[[Page 286]]
13.7.2.6 Concentrate the extract per Sections 12.6 through 12.7 and
clean up the extract using the procedures in Sections 13.2 through 13.6
and 13.8. Alumina (Section 13.4) or Florisil (Section 13.8) and carbon
(Section 13.5) are recommended as minimum additional cleanup steps.
13.7.3 Sulfuric acid and base back-extraction. Used with HCl
digested extracts (Section 12.4.2).
13.7.3.1 Spike 1.0 mL of the cleanup standard (Section 7.11) into
the residue/solvent (Section 12.4.2.8.2).
13.7.3.2 Add 10 mL of concentrated sulfuric acid to the bottle.
Immediately cap and shake one to three times. Loosen cap in a hood to
vent excess pressure. Cap and shake the bottle so that the residue/
solvent is exposed to the acid for a total time of approximately 45
seconds.
13.7.3.3 Decant the hexane into a 250 mL separatory funnel making
sure that no acid is transferred. Complete the quantitative transfer
with several hexane rinses.
13.7.3.4 Back extract the solvent/residue with 50 mL of potassium
hydroxide solution per Section 12.5.2, followed by two reagent water
rinses.
13.7.3.5 Drain the extract through a filter funnel containing
approximately 10 g of granular anhydrous sodium sulfate in a glass-fiber
filter into a macro concentration device (Section 12.6).
13.7.3.6 Concentrate the cleaned up extract to a volume suitable for
the additional cleanups given in Sections 13.2 through 13.6 and 13.8.
Gel permeation chromatography (Section 13.2), alumina (Section 13.4) or
Florisil (Section 13.8), and Carbopak/Celite (Section 13.5) are
recommended as minimum additional cleanup steps.
13.7.3.7 Following cleanup, concentrate the extract to 10 L as
described in Section 12.7 and proceed with analysis per Section 14.
13.8 Florisil Cleanup (Reference 29).
13.8.1 Pre-elute the activated Florisil column (Section 7.5.3) with
10 mL of methylene chloride followed by 10 mL of hexane:methylene
chloride (98:2 v/v) and discard the solvents.
13.8.2 When the solvent is within 1 mm of the packing, apply the
sample extract (in hexane) to the column. Rinse the sample container
twice with 1 mL portions of hexane and apply to the column.
13.8.3 Elute the interfering compounds with 20 mL of
hexane:methylene chloride (98:2) and discard the eluate.
13.8.4 Elute the CDDs/CDFs with 35 mL of methylene chloride and
collect the eluate. Concentrate the eluate per Sections 12.6 through
12.7 for further cleanup or for injection into the HPLC or GC/MS.
14.0 HRGC/HRMS Analysis
14.1 Establish the operating conditions given in Section 10.1.
14.2 Add 10 uL of the appropriate internal standard solution
(Section 7.12) to the sample extract immediately prior to injection to
minimize the possibility of loss by evaporation, adsorption, or
reaction. If an extract is to be reanalyzed and evaporation has
occurred, do not add more instrument internal standard solution. Rather,
bring the extract back to its previous volume (e.g., 19 L) with pure
nonane only (18 L if 2 L injections are used).
14.3 Inject 1.0 [micro]L or 2.0 [micro]L of the concentrated extract
containing the internal standard solution, using on-column or splitless
injection. The volume injected must be identical to the volume used for
calibration (Section 10). Start the GC column initial isothermal hold
upon injection. Start MS data collection after the solvent peak elutes.
Stop data collection after the OCDD and OCDF have eluted. If only
2,3,7,8-TCDD and 2,3,7,8-TCDF are to be determined, stop data collection
after elution of these compounds. Return the column to the initial
temperature for analysis of the next extract or standard.
15.0 System and Laboratory Performance
15.1 At the beginning of each 12-hour shift during which analyses
are performed, GC/MS system performance and calibration are verified for
all CDDs/CDFs and labeled compounds. For these tests, analysis of the
CS3 calibration verification (VER) standard (Section 7.13 and Table 4)
and the isomer specificity test standards (Section 7.15 and Table 5)
shall be used to verify all performance criteria. Adjustment and/or
recalibration (Section 10) shall be performed until all performance
criteria are met. Only after all performance criteria are met may
samples, blanks, IPRs, and OPRs be analyzed.
15.2 MS Resolution--A static resolving power of at least 10,000 (10%
valley definition) must be demonstrated at the appropriate m/z before
any analysis is performed. Static resolving power checks must be
performed at the beginning and at the end of each 12-hour shift
according to procedures in Section 10.1.2. Corrective actions must be
implemented whenever the resolving power does not meet the requirement.
15.3 Calibration Verification.
15.3.1 Inject the VER standard using the procedure in Section 14.
15.3.2 The m/z abundance ratios for all CDDs/CDFs shall be within
the limits in Table 9; otherwise, the mass spectrometer shall be
adjusted until the m/z abundance ratios fall within the limits
specified, and the verification test shall be repeated. If the
adjustment alters the resolution of the mass spectrometer, resolution
shall be verified (Section 10.1.2) prior to repeat of the verification
test.
15.3.3 The peaks representing each CDD/CDF and labeled compound in
the VER
[[Page 287]]
standard must be present with S/N of at least 10; otherwise, the mass
spectrometer shall be adjusted and the verification test repeated.
15.3.4 Compute the concentration of each CDD/CDF compound by isotope
dilution (Section 10.5) for those compounds that have labeled analogs
(Table 1). Compute the concentration of the labeled compounds by the
internal standard method (Section 10.6). These concentrations are
computed based on the calibration data in Section 10.
15.3.5 For each compound, compare the concentration with the
calibration verification limit in Table 6. If only 2,3,7,8-TCDD and
2,3,7,8-TCDF are to be determined, compare the concentration to the
limit in Table 6a. If all compounds meet the acceptance criteria,
calibration has been verified and analysis of standards and sample
extracts may proceed. If, however, any compound fails its respective
limit, the measurement system is not performing properly for that
compound. In this event, prepare a fresh calibration standard or correct
the problem causing the failure and repeat the resolution (Section 15.2)
and verification (Section 15.3) tests, or recalibrate (Section 10).
15.4 Retention Times and GC Resolution.
15.4.1 Retention times.
15.4.1.1 Absolute--The absolute retention times of the
\13\C12-1,2,3,4-TCDD and \13\C12-1,2,3,7,8,9-HxCDD
GCMS internal standards in the verification test (Section 15.3) shall be
within 15 seconds of the retention times obtained
during calibration (Sections 10.2.1 and 10.2.4).
15.4.1.2 Relative--The relative retention times of CDDs/CDFs and
labeled compounds in the verification test (Section 15.3) shall be
within the limits given in Table 2.
15.4.2 GC resolution.
15.4.2.1 Inject the isomer specificity standards (Section 7.15) on
their respective columns.
15.4.2.2 The valley height between 2,3,7,8-TCDD and the other tetra-
dioxin isomers at m/z 319.8965, and between 2,3,7,8-TCDF and the other
tetra-furan isomers at m/z 303.9016 shall not exceed 25% on their
respective columns (Figures 6 and 7).
15.4.3 If the absolute retention time of any compound is not within
the limits specified or if the 2,3,7,8-isomers are not resolved, the GC
is not performing properly. In this event, adjust the GC and repeat the
verification test (Section 15.3) or recalibrate (Section 10), or replace
the GC column and either verify calibration or recalibrate.
15.5 Ongoing Precision and Recovery.
15.5.1 Analyze the extract of the ongoing precision and recovery
(OPR) aliquot (Section 11.4.2.5, 11.5.4, 11.6.2, 11.7.4, or 11.8.3.2)
prior to analysis of samples from the same batch.
15.5.2 Compute the concentration of each CDD/CDF by isotope dilution
for those compounds that have labeled analogs (Section 10.5). Compute
the concentration of 1,2,3,7,8,9-HxCDD, OCDF, and each labeled compound
by the internal standard method (Section 10.6).
15.5.3 For each CDD/CDF and labeled compound, compare the
concentration to the OPR limits given in Table 6. If only 2,3,7,8-TCDD
and 2,3,7,8-TCDF are to be determined, compare the concentration to the
limits in Table 6a. If all compounds meet the acceptance criteria,
system performance is acceptable and analysis of blanks and samples may
proceed. If, however, any individual concentration falls outside of the
range given, the extraction/concentration processes are not being
performed properly for that compound. In this event, correct the
problem, re-prepare, extract, and clean up the sample batch and repeat
the ongoing precision and recovery test (Section 15.5).
15.5.4 Add results that pass the specifications in Section 15.5.3 to
initial and previous ongoing data for each compound in each matrix.
Update QC charts to form a graphic representation of continued
laboratory performance. Develop a statement of laboratory accuracy for
each CDD/CDF in each matrix type by calculating the average percent
recovery (R) and the standard deviation of percent recovery
(SR). Express the accuracy as a recovery interval from R-
2SR to R=2SR. For example, if R=95% and
SR=5%, the accuracy is 85-105%.
15.6 Blank--Analyze the method blank extracted with each sample
batch immediately following analysis of the OPR aliquot to demonstrate
freedom from contamination and freedom from carryover from the OPR
analysis. The results of the analysis of the blank must meet the
specifications in Section 9.5.2 before sample analyses may proceed.
16.0 Qualitative Determination
A CDD, CDF, or labeled compound is identified in a standard, blank,
or sample when all of the criteria in Sections 16.1 through 16.4 are
met.
16.1 The signals for the two exact m/z's in Table 8 must be present
and must maximize within the same two seconds.
16.2 The signal-to-noise ratio (S/N) for the GC peak at each exact
m/z must be greater than or equal to 2.5 for each CDD or CDF detected in
a sample extract, and greater than or equal to 10 for all CDDs/CDFs in
the calibration standard (Sections 10.2.3 and 15.3.3).
16.3 The ratio of the integrated areas of the two exact m/z's
specified in Table 8 must be within the limit in Table 9, or within
10% of the ratio in the midpoint (CS3) calibration
or calibration verification (VER), whichever is most recent.
16.4 The relative retention time of the peak for a 2,3,7,8-
substituted CDD or CDF must be within the limit in Table 2. The
retention time of peaks representing non-
[[Page 288]]
2,3,7,8-substituted CDDs/CDFs must be within the retention time windows
established in Section 10.3.
16.5 Confirmatory Analysis--Isomer specificity for 2,3,7,8-TCDF
cannot be achieved on the DB-5 column. Therefore, any sample in which
2,3,7,8-TCDF is identified by analysis on a DB-5 column must have a
confirmatory analysis performed on a DB-225, SP-2330, or equivalent GC
column. The operating conditions in Section 10.1.1 may be adjusted to
optimize the analysis on the second GC column, but the GC/MS must meet
the mass resolution and calibration specifications in Section 10.
16.6 If the criteria for identification in Sections 16.1 through
16.5 are not met, the CDD or CDF has not been identified and the results
may not be reported for regulatory compliance purposes. If interferences
preclude identification, a new aliquot of sample must be extracted,
further cleaned up, and analyzed.
17.0 Quantitative Determination
17.1 Isotope Dilution Quantitation--By adding a known amount of a
labeled compound to every sample prior to extraction, correction for
recovery of the CDD/CDF can be made because the CDD/CDF and its labeled
analog exhibit similar effects upon extraction, concentration, and gas
chromatography. Relative response (RR) values are used in conjunction
with the initial calibration data described in Section 10.5 to determine
concentrations directly, so long as labeled compound spiking levels are
constant, using the following equation:
[GRAPHIC] [TIFF OMITTED] TR15SE97.007
where:
Cex = The concentration of the CDD/CDF in the extract, and
the other terms are as defined in Section 10.5.2.
17.1.1 Because of a potential interference, the labeled analog of
OCDF is not added to the sample. Therefore, OCDF is quantitated against
labeled OCDD. As a result, the concentration of OCDF is corrected for
the recovery of the labeled OCDD. In instances where OCDD and OCDF
behave differently during sample extraction, concentration, and cleanup
procedures, this may decrease the accuracy of the OCDF results. However,
given the low toxicity of this compound relative to the other dioxins
and furans, the potential decrease in accuracy is not considered
significant.
17.1.2 Because \13\C12-1,2,3,7,8,9-HxCDD is used as an
instrument internal standard (i.e., not added before extraction of the
sample), it cannot be used to quantitate the 1,2,3,7,8,9-HxCDD by strict
isotope dilution procedures. Therefore, 1,2,3,7,8,9-HxCDD is quantitated
using the averaged response of the labeled analogs of the other two
2,3,7,8-substituted HxCDD's: 1,2,3,4,7,8-HxCDD and 1,2,3,6,7,8-HxCDD. As
a result, the concentration of 1,2,3,7,8,9-HxCDD is corrected for the
average recovery of the other two HxCDD's.
17.1.3 Any peaks representing non-2,3,7,8-substituted CDDs/CDFs are
quantitated using an average of the response factors from all of the
labeled 2,3,7,8-isomers at the same level of chlorination.
17.2 Internal Standard Quantitation and Labeled Compound Recovery.
17.2.1 Compute the concentrations of 1,2,3,7,8,9-HxCDD, OCDF, the
\13\C-labeled analogs and the \37\C-labeled cleanup standard in the
extract using the response factors determined from the initial
calibration data (Section 10.6) and the following equation:
[GRAPHIC] [TIFF OMITTED] TR15SE97.008
where:
Cex = The concentration of the CDD/CDF in the extract, and
the other terms are as defined in Section 10.6.1.
Note: There is only one m/z for the \37\Cl-labeled standard.
17.2.2 Using the concentration in the extract determined above,
compute the percent recovery of the \13\C-labeled compounds and the
\37\C-labeled cleanup standard using the following equation:
[GRAPHIC] [TIFF OMITTED] TR15SE97.009
17.3 The concentration of a CDD/CDF in the solid phase of the sample
is computed using the concentration of the compound in the extract and
the weight of the solids (Section 11.5.1), as follows:
[[Page 289]]
[GRAPHIC] [TIFF OMITTED] TR15SE97.010
where:
Cex = The concentration of the compound in the extract.
Vex = The extract volume in mL.
Ws = The sample weight (dry weight) in kg.
17.4 The concentration of a CDD/CDF in the aqueous phase of the
sample is computed using the concentration of the compound in the
extract and the volume of water extracted (Section 11.4 or 11.5), as
follows:
[GRAPHIC] [TIFF OMITTED] TR15SE97.011
where:
Cex = The concentration of the compound in the extract.
Vex = The extract volume in mL.
Vs = The sample volume in liters.
17.5 If the SICP area at either quantitation m/z for any compound
exceeds the calibration range of the system, a smaller sample aliquot is
extracted.
17.5.1 For aqueous samples containing 1% solids or less, dilute 100
mL, 10 mL, etc., of sample to 1 L with reagent water and re-prepare,
extract, clean up, and analyze per Sections 11 through 14.
17.5.2 For samples containing greater than 1% solids, extract an
amount of sample equal to 1/10, 1/100, etc., of
the amount used in Section 11.5.1. Re-prepare, extract, clean up, and
analyze per Sections 11 through 14.
17.5.3 If a smaller sample size will not be representative of the
entire sample, dilute the sample extract by a factor of 10, adjust the
concentration of the instrument internal standard to 100 pg/[micro]L in
the extract, and analyze an aliquot of this diluted extract by the
internal standard method.
17.6 Results are reported to three significant figures for the CDDs/
CDFs and labeled compounds found in all standards, blanks, and samples.
17.6.1 Reporting units and levels.
17.6.1.1 Aqueous samples--Report results in pg/L (parts-per-
quadrillion).
17.6.1.2 Samples containing greater than 1% solids (soils,
sediments, filter cake, compost)--Report results in ng/kg based on the
dry weight of the sample. Report the percent solids so that the result
may be corrected.
17.6.1.3 Tissues--Report results in ng/kg of wet tissue, not on the
basis of the lipid content of the sample. Report the percent lipid
content, so that the data user can calculate the concentration on a
lipid basis if desired.
17.6.1.4 Reporting level.
17.6.1.4.1 Standards (VER, IPR, OPR) and samples--Report results at
or above the minimum level (Table 2). Report results below the minimum
level as not detected or as required by the regulatory authority.
17.6.1.4.2 Blanks--Report results above one-third the ML.
17.6.2 Results for CDDs/CDFs in samples that have been diluted are
reported at the least dilute level at which the areas at the
quantitation m/z's are within the calibration range (Section 17.5).
17.6.3 For CDDs/CDFs having a labeled analog, results are reported
at the least dilute level at which the area at the quantitation m/z is
within the calibration range (Section 17.5) and the labeled compound
recovery is within the normal range for the method (Section 9.3 and
Tables 6, 6a, 7, and 7a).
17.6.4 Additionally, if requested, the total concentration of all
isomers in an individual level of chlorination (i.e., total TCDD, total
TCDF, total Paced, etc.) may be reported by summing the concentrations
of all isomers identified in that level of chlorination, including both
2,3,7,8-substituted and non-2,3,7,8-substituted isomers.
18.0 Analysis of Complex Samples
18.1 Some samples may contain high levels (10 ng/L;
1000 ng/kg) of the compounds of interest, interfering
compounds, and/or polymeric materials. Some extracts will not
concentrate to 10 [micro]L (Section 12.7); others may overload the GC
column and/or mass spectrometer.
18.2 Analyze a smaller aliquot of the sample (Section 17.5) when the
extract will not concentrate to 10 [micro]L after all cleanup procedures
have been exhausted.
18.3 Chlorodiphenyl Ethers--If chromatographic peaks are detected at
the retention time of any CDDs/CDFs in any of the m/z channels being
monitored for the
[[Page 290]]
chlorodiphenyl ethers (Table 8), cleanup procedures must be employed
until these interferences are removed. Alumina (Section 13.4) and
Florisil (Section 13.8) are recommended for removal of chlorodiphenyl
ethers.
18.4 Recovery of Labeled Compounds--In most samples, recoveries of
the labeled compounds will be similar to those from reagent water or
from the alternate matrix (Section 7.6).
18.4.1 If the recovery of any of the labeled compounds is outside of
the normal range (Table 7), a diluted sample shall be analyzed (Section
17.5).
18.4.2 If the recovery of any of the labeled compounds in the
diluted sample is outside of normal range, the calibration verification
standard (Section 7.13) shall be analyzed and calibration verified
(Section 15.3).
18.4.3 If the calibration cannot be verified, a new calibration must
be performed and the original sample extract reanalyzed.
18.4.4 If the calibration is verified and the diluted sample does
not meet the limits for labeled compound recovery, the method does not
apply to the sample being analyzed and the result may not be reported
for regulatory compliance purposes. In this case, alternate extraction
and cleanup procedures in this method must be employed to resolve the
interference. If all cleanup procedures in this method have been
employed and labeled compound recovery remains outside of the normal
range, extraction and/or cleanup procedures that are beyond this scope
of this method will be required to analyze these samples.
19.0 Pollution Prevention
19.1 The solvents used in this method pose little threat to the
environment when managed properly. The solvent evaporation techniques
used in this method are amenable to solvent recovery, and it is
recommended that the laboratory recover solvents wherever feasible.
19.2 Standards should be prepared in volumes consistent with
laboratory use to minimize disposal of standards.
20.0 Waste Management
20.1 It is the laboratory's responsibility to comply with all
federal, state, and local regulations governing waste management,
particularly the hazardous waste identification rules and land disposal
restrictions, and to protect the air, water, and land by minimizing and
controlling all releases from fume hoods and bench operations.
Compliance is also required with any sewage discharge permits and
regulations.
20.2 Samples containing HCl to pH <2 are hazardous and must be
neutralized before being poured down a drain or must be handled as
hazardous waste.
20.3 The CDDs/CDFs decompose above 800 [deg]C. Low-level waste such
as absorbent paper, tissues, animal remains, and plastic gloves may be
burned in an appropriate incinerator. Gross quantities (milligrams)
should be packaged securely and disposed of through commercial or
governmental channels that are capable of handling extremely toxic
wastes.
20.4 Liquid or soluble waste should be dissolved in methanol or
ethanol and irradiated with ultraviolet light with a wavelength shorter
than 290 nm for several days. Use F40 BL or equivalent lamps. Analyze
liquid wastes, and dispose of the solutions when the CDDs/CDFs can no
longer be detected.
20.5 For further information on waste management, consult ``The
Waste Management Manual for Laboratory Personnel'' and ``Less is
Better--Laboratory Chemical Management for Waste Reduction,'' available
from the American Chemical Society's Department of Government Relations
and Science Policy, 1155 16th Street N.W., Washington, D.C. 20036.
21.0 Method Performance
Method performance was validated and performance specifications were
developed using data from EPA's international interlaboratory validation
study (References 30-31) and the EPA/paper industry Long-Term
Variability Study of discharges from the pulp and paper industry (58 FR
66078).
22.0 References
1. Tondeur, Yves. ``Method 8290: Analytical Procedures and Quality
Assurance for Multimedia Analysis of Polychlorinated Dibenzo-p-dioxins
and Dibenzofurans by High Resolution Gas Chromatography/High Resolution
Mass Spectrometry,'' USEPA EMSL, Las Vegas, Nevada, June 1987.
2. ``Measurement of 2,3,7,8-Tetrachlorinated Dibenzo-p-dioxin (TCDD)
and 2,3,7,8-Tetrachlorinated Dibenzofuran (TCDF) in Pulp, Sludges,
Process Samples and Wastewaters from Pulp and Paper Mills,'' Wright
State University, Dayton, OH 45435, June 1988.
3. ``NCASI Procedures for the Preparation and Isomer Specific
Analysis of Pulp and Paper Industry Samples for 2,3,7,8-TCDD and
2,3,7,8-TCDF,'' National Council of the Paper Industry for Air and
Stream Improvement Inc., 260 Madison Avenue, New York, NY 10016,
Technical Bulletin No. 551, Pre-Release Copy, July 1988.
4. ``Analytical Procedures and Quality Assurance Plan for the
Determination of PCDD/PCDF in Fish,'' USEPA, Environmental Research
Laboratory, 6201 Congdon Boulevard, Duluth, MN 55804, April 1988.
5. Tondeur, Yves. ``Proposed GC/MS Methodology for the Analysis of
PCDDs and
[[Page 291]]
PCDFs in Special Analytical Services Samples,'' Triangle Laboratories,
Inc., 801-10 Capitola Dr, Research Triangle Park, NC 27713, January
1988; updated by personal communication September 1988.
6. Lamparski, L.L. and Nestrick, T.J. ``Determination of Tetra-,
Hexa-, Hepta-, and Octachlorodibenzo-p-dioxin Isomers in Particulate
Samples at Parts per Trillion Levels,'' Analytical Chemistry, 52: 2045-
2054, 1980.
7. Lamparski, L.L. and Nestrick, T.J. ``Novel Extraction Device for
the Determination of Chlorinated Dibenzo-p-dioxins (PCDDs) and
Dibenzofurans (PCDFs) in Matrices Containing Water,'' Chemosphere,
19:27-31, 1989.
8. Patterson, D.G., et. al. ``Control of Interferences in the
Analysis of Human Adipose Tissue for 2,3,7,8-Tetrachlorodibenzo-p-
dioxin,'' Environmental Toxicological Chemistry, 5:355-360, 1986.
9. Stanley, John S. and Sack, Thomas M. ``Protocol for the Analysis
of 2,3,7,8-Tetrachlorodibenzo-p-dioxin by High Resolution Gas
Chromatography/High Resolution Mass Spectrometry,'' USEPA EMSL, Las
Vegas, Nevada 89114, EPA 600/4-86-004, January 1986.
10. ``Working with Carcinogens,'' Department of Health, Education, &
Welfare, Public Health Service, Centers for Disease Control, NIOSH,
Publication 77-206, August 1977, NTIS PB-277256.
11. ``OSHA Safety and Health Standards, General Industry,'' OSHA
2206, 29 CFR 1910.
12. ``Safety in Academic Chemistry Laboratories,'' ACS Committee on
Chemical Safety, 1979.
13. ``Standard Methods for the Examination of Water and
Wastewater,'' 18th edition and later revisions, American Public Health
Association, 1015 15th St, N.W., Washington, DC 20005, 1-35: Section
1090 (Safety), 1992.
14. ``Method 613--2,3,7,8-Tetrachlorodibenzo-p-dioxin,'' 40 CFR 136
(49 FR 43234), October 26, 1984, Section 4.1.
15. Provost, L.P. and Elder, R.S. ``Interpretation of Percent
Recovery Data,'' American Laboratory, 15: 56-83, 1983.
16. ``Standard Practice for Sampling Water,'' ASTM Annual Book of
Standards, ASTM, 1916 Race Street, Philadelphia, PA 19103-1187, 1980.
17. ``Methods 330.4 and 330.5 for Total Residual Chlorine,'' USEPA,
EMSL, Cincinnati, OH 45268, EPA 600/4-79-020, March 1979.
18. ``Handbook of Analytical Quality Control in Water and Wastewater
Laboratories,'' USEPA EMSL, Cincinnati, OH 45268, EPA-600/4-79-019,
March 1979.
19. Williams, Rick. Letter to Bill Telliard, June 4, 1993, available
from the EPA Sample Control Center operated by DynCorp Viar, Inc., 300 N
Lee St, Alexandria, VA 22314, 703-519-1140.
20. Barkowski, Sarah. Fax to Sue Price, August 6, 1992, available
from the EPA Sample Control Center operated by DynCorp Viar, Inc., 300 N
Lee St, Alexandria VA 22314, 703-519-1140.
21. ``Analysis of Multi-media, Multi-concentration Samples for
Dioxins and Furans, PCDD/PCDF Analyses Data Package'', Narrative for
Episode 4419, MRI Project No. 3091-A, op.cit. February 12, 1993,
Available from the EPA Sample Control Center operated by DynCorp Viar
Inc, 300 N Lee St, Alexandria, VA 22314 (703-519-1140).
22. ``Analytical Procedures and Quality Assurance Plan for the
Determination of PCDD/PCDF in Fish'', U.S. Environmental Protection
Agency, Environmental Research Laboratory, Duluth, MN 55804, EPA/600/3-
90/022, March 1990.
23. Afghan, B.K., Carron, J., Goulden, P.D., Lawrence, J., Leger,
D., Onuska, F., Sherry, J., and Wilkenson, R.J., ``Recent Advances in
Ultratrace Analysis of Dioxins and Related Halogenated Hydrocarbons'',
Can J. Chem., 65: 1086-1097, 1987.
24. Sherry, J.P. and Tse, H. ``A Procedure for the Determination of
Polychlorinated Dibenzo-p-dioxins in Fish'', Chemosphere, 20: 865-872,
1990.
25. ``Preliminary Fish Tissue Study'', Results of Episode 4419,
available from the EPA Sample Control Center operated by DynCorp Viar,
Inc., 300 N Lee St, Alexandria, VA 22314, 703-519-1140.
26. Nestrick, Terry L. DOW Chemical Co., personal communication with
D.R. Rushneck, April 8, 1993. Details available from the U.S.
Environmental Protection Agency Sample Control Center operated by
DynCorp Viar Inc, 300 N Lee St, Alexandria, VA 22314, 703-519-1140.
27. Barnstadt, Michael. ``Big Fish Column'', Triangle Laboratories
of RTP, Inc., SOP 129-90, 27 March 27, 1992.
28. ``Determination of Polychlorinated Dibenzo-p-Dioxins (PCDD) and
Dibenzofurans (PCDF) in Environmental Samples Using EPA Method 1613'',
Chemical Sciences Department, Midwest Research Institute, 425 Volker
Boulevard, Kansas City, MO 44110-2299, Standard Operating Procedure No.
CS-153, January 15, 1992.
29. Ryan, John J. Raymonde Lizotte and William H. Newsome, J.
Chromatog. 303 (1984) 351-360.
30. Telliard, William A., McCarty, Harry B., and Riddick, Lynn S.
``Results of the Interlaboratory Validation Study of USEPA Method 1613
for the Analysis of Tetra-through Octachlorinated Dioxins and Furans by
Isotope Dilution GC/MS,'' Chemosphere, 27, 41-46 (1993).
31. ``Results of the International Interlaboratory Validation Study
of USEPA Method 1613'', October 1994, available from the EPA Sample
Control Center operated by DynCorp
[[Page 292]]
Viar, Inc., 300 N Lee St, Alexandria, VA 22314, 703-519-1140.
23.0 Tables and Figures
Table 1--Chlorinated Dibenzo-p-Dioxins and Furans Determined by Isotope Dilution and Internal Standard High
Resolution Gas Chromatography (HRGC)/High Resolution Mass Spectrometry (HRMS)
----------------------------------------------------------------------------------------------------------------
CDDs/CDFs \1\ CAS registry Labeled analog CAS registry
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD.................................. 1746-01-6 \13\C12-2,3,7,8-TCDD............ 76523-40-5
\37\Cl4-2,3,7,8-TCDD............ 85508-50-5
Total TCDD.................................... 41903-57-5
2,3,7,8-TCDF.................................. 51207-31-9 \13\C12-2,3,7,8-TCDF............ 89059-46-1
Total-TCDF.................................... 55722-27-5
1,2,3,7,8-PeCDD............................... 40321-76-4 \13\C12-1,2,3,7,8-PeCDD......... 109719-79-1
Total-PeCDD................................... 36088-22-9
1,2,3,7,8-PeCDF............................... 57117-41-6 \13\C12-1,2,3,7,8-PeCDF......... 109719-77-9
2,3,4,7,8-PeCDF............................... 57117-31-4 \13\C12-2,3,4,7,8-PeCDF......... 116843-02-8
Total-PeCDF................................... 30402-15-4
1,2,3,4,7,8-HxCDD............................. 39227-28-6 \13\C12-1,2,3,4,7,8-HxCDD....... 109719-80-4
1,2,3,6,7,8-HxCDD............................. 57653-85-7 \13\C12-1,2,3,6,7,8-HxCDD....... 109719-81-5
1,2,3,7,8,9-HxCDD............................. 19408-74-3 \13\C12-1,2,3,7,8,9-HxCDD....... 109719-82-6
Total-HxCDD................................... 34465-46-8
1,2,3,4,7,8-HxCDF............................. 70648-26-9 \13\C12-1,2,3,4,7,8-HxCDF....... 114423-98-2
1,2,3,6,7,8-HxCDF............................. 57117-44-9 \13\C12-1,2,3,6,7,8-HxCDF....... 116843-03-9
1,2,3,7,8,9-HxCDF............................. 72918-21-9 \13\C12-1,2,3,7,8,9-HxCDF....... 116843-04-0
2,3,4,6,7,8-HxCDF............................. 60851-34-5 \13\C12-2,3,4,6,7,8-HxCDF....... 116843-05-1
Total-HxCDF................................... 55684-94-1
1,2,3,4,6,7,8-HpCDD........................... 35822-46-9 \13\C12-1,2,3,4,6,7,8-HpCDD..... 109719-83-7
Total-HpCDD................................... 37871-00-4
1,2,3,4,6,7,8-HpCDF........................... 67562-39-4 \13\C12-1,2,3,4,6,7,8-HpCDF..... 109719-84-8
1,2,3,4,7,8,9-HpCDF........................... 55673-89-7 \13\C12-1,2,3,4,7,8,9-HpCDF..... 109719-94-0
Total-HpCDF................................... 38998-75-3
OCDD.......................................... 3268-87-9 \13\C12-OCDD.................... 114423-97-1
OCDF.......................................... 39001-02-0 Not used........................
----------------------------------------------------------------------------------------------------------------
\1\ Chlorinated dibenzo-p-dioxins and chlorinated dibenzofurans.
TCDD = Tetrachlorodibenzo-p-dioxin.
TCDF = Tetrachlorodibenzofuran.
PeCDD = Pentachlorodibenzo-p-dioxin.
PeCDF = Pentachlorodibenzofuran.
HxCDD = Hexachlorodibenzo-p-dioxin.
HxCDF = Hexachlorodibenzofuran.
HpCDD = Heptachlorodibenzo-p-dioxin.
HpCDF = Heptachlorodibenzofuran.
OCDD = Octachlorodibenzo-p-dioxin.
OCDF = Octachlorodibenzofuran.
Table 2--Retention Time References, Quantitation References, Relative Retention Times, and Minimum Levels for
CDDS and DCFS
----------------------------------------------------------------------------------------------------------------
Minimum level \1\
--------------------------------
Retention time and Relative Extract
CDD/CDF quantitation reference retention time Water (pg/ Solid (ng/ (pg/
L; ppq) kg; ppt) [micro]L;
ppb)
----------------------------------------------------------------------------------------------------------------
Compounds using \13\ C12-1,2,3,4-TCDD as the Injection Internal Standard
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDF......................... \13\ C12-2,3,7,8-TCDF... 0.999-1.003 10 1 0.5
2,3,7,8-TCDD......................... \13\ C12-2,3,7,8-TCDD... 0.999-1.002 10 1 0.5
1,2,3,7,8-Pe......................... \13\ C12-1,2,3,7,8-PeCDF 0.999-1.002 50 5 2.5
2,3,4,7,8-PeCDF...................... \13\ C12-2,3,4,7,8-PeCDF 0.999-1.002 50 5 2.5
1,2,3,7,8-PeCDD...................... \13\ C12-1,2,3,7,8-PeCDD 0.999-1.002 50 5 2.5
\13\ C12-2,3,7,8-TCDF................ \13\ C12-1,2,3,4-TCDD... 0.923-1.103 ......... ......... .........
\13\ C12-2,3,7,8-TCDD................ \13\ C12-1,2,3,4-TCDD... 0.976-1.043 ......... ......... .........
\13\ C12-2,3,7,8-TCDD................ \13\ C12-1,2,3,4-TCDD... 0.989-1.052 ......... ......... .........
\13\ C12-1,2,3,7,8-PeCDF............. \13\ C12-1,2,3,4-TCDD... 1.000-1.425 ......... ......... .........
\13\ C12-2,3,4,7,8-PeCDF............. \13\ C12-1,2,3,4-TCDD... 1.001-1.526 ......... ......... .........
\13\ C12-1,2,3,7,8-PeCDF............. \13\ C12-1,2,3,4-TCDD... 1.000-1.567 ......... ......... .........
----------------------------------------------------------------------------------------------------------------
Compounds using \13\ C12-1,2,3,7,8,9-HxCDD as the Injection Internal Standard
----------------------------------------------------------------------------------------------------------------
1,2,3,4,7,8-HxCDF.................... \13\ C12-1,2,3,4,7,8- 0.999-1.001 50 5 2.5
HxCDF.
1,2,3,6,7,8-HxCDF.................... \13\ C12-1,2,3,6,7,8- 0.997-1.005 50 5 2.5
HxCDF.
1,2,3,7,8,9-HxCDF.................... \13\ C12-1,2,3,7,8,9- 0.999-1.001 50 5 2.5
HxCDF.
2,3,4,6,7,8-HxCDF.................... \13\ C12-2,3,4,6,7,8- 0.999-1.001 50 5 2.5
HxCDF.
1,2,3,4,7,8-HxCDD.................... \13\ C12-1,2,3,4,7,8- 0.999-1.001 50 5 2.5
HxCDD.
[[Page 293]]
1,2,3,6,7,8-HxCDD.................... \13\ C12-1,2,3,6,7,8- 0.998-1.004 50 5 2.5
HxCDD.
1,2,3,7,8,9-HxCDD.................... (\2\)................... 1.000-1.019 50 5 2.5
1,2,3,4,6,7,8-HpCDF.................. \13\ C12-1,2,3,4,6,7,8- 0.999-1.001 50 5 2.5
HpCDF.
1,2,3,4,7,8,9-HpCDF.................. \13\ C12-1,2,3,4,7,8,9- 0.999-1.001 50 5 2.5
HpCDF.
1,2,3,4,6,7,8-HpCDD.................. \13\ C12-1,2,3,4,6,7,8- 0.999-1.001 50 5 2.5
HpCDD.
OCDF................................. \13\ C12-OCDD........... 0.999-1.001 100 10 5.0
OCDD................................. \13\ C12-OCDD........... 0.999-1.001 100 10 5.0
1,2,3,4,6,7,8,-HxCDF................. \13\ C12-1,2,3,7,8,9- 0.949-0.975 ......... ......... .........
HpCDD.
\13\ C121,2,3,7,8,9-HxCDF............ \13\ C12-1,2,3,7,8,9- 0.977-1.047 ......... ......... .........
HpCDD.
\13\ C122,3,4,6,7,8,-HxCDF........... \13\ C12-1,2,3,7,8,9- 0.959-1.021 ......... ......... .........
HpCDD.
\13\ C121,2,3,4,7,8,-HxCDF........... \13\ C12-1,2,3,7,8,9- 0.977-1.000 ......... ......... .........
HpCDD.
\13\ C121,2,3,6,7,8,-HxCDF........... \13\ C12-1,2,3,7,8,9- 0.981-1.003 ......... ......... .........
HpCDD.
\13\ C121,2,3,4,6,7,8-HxCDF.......... \13\ C12-1,2,3,7,8,9- 1.043-1.085 ......... ......... .........
HpCDD.
\13\ C121,2,3,4,7,8,9-HxCDF.......... \13\ C12-1,2,3,7,8,9- 1.057-1.151 ......... ......... .........
HpCDD.
\13\ C121,2,3,4,6,7,8-HxCDF.......... \13\ C12-1,2,3,7,8,9- 1.086-1.110 ......... ......... .........
HpCDD.
\13\ C12OCDD......................... \13\ C12-1,2,3,7,8,9- 1.032-1.311 ......... ......... .........
HpCDD.
----------------------------------------------------------------------------------------------------------------
\1\ The Minimum Level (ML) for each analyte is defined as the level at which the entire analytical system must
give a recognizable signal and acceptable calibration point. It is equivalent to the concentration of the
lowest calibration standard, assuming that all method-specified sample weights, volumes, and cleanup
procedures have been employed.
\2\ The retention time reference for 1,2,3,7,8,9-HxCDD is \13\C12-1,2,3,6,7,8-HxCDD, and 1,2,3,7,8,9-HxCDD is
quantified using the averaged responses for \13\C12-1,2,3,4,7,8-HxCDD and \13\C12-1,2,3,6,7,8-HxCDD.
Table 3--Concentration of Stock and Spiking Solutions Containing CDDS/CDFS and Labeled Compounds
----------------------------------------------------------------------------------------------------------------
Labeled
Labeled compound
compound spiking PAR stock PAR spiking
CDD/CDF stock solution solution solution \4\
solution \1\ \2\ (ng/ \3\ (ng/mL) (ng/mL)
(ng/mL) mL)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD.............................................. ............ ........... 40 0.8
2,3,7,8-TCDF.............................................. ............ ........... 40 0.8
1,2,3,7,8-PeCDD........................................... ............ ........... 200 4
1,2,3,7,8-PeCDF........................................... ............ ........... 200 4
2,3,4,7,8-PeCDF........................................... ............ ........... 200 4
1,2,3,4,7,8-HxCDD......................................... ............ ........... 200 4
1,2,3,6,7,8-HxCDD......................................... ............ ........... 200 4
1,2,3,7,8,9-HxCDD......................................... ............ ........... 200 4
1,2,3,4,7,8-HxCDF......................................... ............ ........... 200 4
1,2,3,6,7,8-HxCDF......................................... ............ ........... 200 4
1,2,3,7,8,9-HxCDF......................................... ............ ........... 200 4
2,3,4,6,7,8-HxCDF......................................... ............ ........... 200 4
1,2,3,4,6,7,8-HpCDD....................................... ............ ........... 200 4
1,2,3,4,6,7,8-HpCDF....................................... ............ ........... 200 4
1,2,3,4,7,8,9-HpCDF....................................... ............ ........... 200 4
OCDD...................................................... ............ ........... 400 8
OCDF...................................................... ............ ........... 400 8
\13\C12-2,3,7,8-TCDD...................................... 100 2 ........... ............
\13\C12-2,3,7,8-TCDF...................................... 100 2 ........... ............
\13\C12-1,2,3,7,8-PeCDD................................... 100 2 ........... ............
\13\C12-1,2,3,7,8-PeCDF................................... 100 2 ........... ............
\13\C12-2,3,4,7,8-PeCDF................................... 100 2 ........... ............
\13\C12-1,2,3,4,7,8-HxCDD................................. 100 2 ........... ............
\13\C12-1,2,3,6,7,8-HxCDD................................. 100 2 ........... ............
\13\C12-1,2,3,4,7,8-HxCDF................................. 100 2 ........... ............
\13\C12-1,2,3,6,7,8-HxCDF................................. 100 2 ........... ............
\13\C12-1,2,3,7,8,9-HxCDF................................. 100 2 ........... ............
\13\C12-2,3,4,6,7,8-HxCDF................................. 100 2 ........... ............
\13\C12-1,2,3,4,6,7,8-HpCDD............................... 100 2 ........... ............
\13\C12-1,2,3,4,6,7,8-HpCDF............................... 100 2 ........... ............
\13\C12-1,2,3,4,7,8,9-HpCDF............................... 100 2 ........... ............
\13\C12-OCDD.............................................. 200 4 ........... ............
Cleanup Standard \5\
\37\Cl4-2,3,7,8-TCDD.................................. 0.8 ........... ........... ............
Internal Standards \6\
\13\C12-1,2,3,4-TCDD.................................. 200 ........... ........... ............
[[Page 294]]
\13\C12-1,2,3,7,8,9-HxCDD............................. 200 ........... ........... ............
----------------------------------------------------------------------------------------------------------------
\1\ Section 7.10--prepared in nonane and diluted to prepare spiking solution.
\2\ Section 7.10.3--prepared in acetone from stock solution daily.
\3\ Section 7.9--prepared in nonane and diluted to prepare spiking solution.
\4\ Section 7.14--prepared in acetone from stock solution daily.
\5\ Section 7.11--prepared in nonane and added to extract prior to cleanup.
\6\ Section 7.12--prepared in nonane and added to the concentrated extract immediately prior to injection into
the GC (Section 14.2).
Table 4--Concentration of CDDS/CDFS in Calibration and Calibration Verification Solutions \1\ (Section 15.3)
----------------------------------------------------------------------------------------------------------------
CS2 (ng/ CS3 (ng/ CS4 (ng/ CS5 (ng/
CDD/CDF mL) mL) mL) mL)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD.................................. 0.5 2 10 40 200
2,3,7,8-TCDF.................................. 0.5 2 10 40 200
1,2,3,7,8-PeCDD............................... 2.5 10 50 200 1000
1,2,3,7,8-PeCDF............................... 2.5 10 50 200 1000
2,3,4,7,8-PeCDF............................... 2.5 10 50 200 1000
1,2,3,4,7,8-HxCDD............................. 2.5 10 50 200 1000
1,2,3,6,7,8-HxCDD............................. 2.5 10 50 200 1000
1,2,3,7,8,9-HxCDD............................. 2.5 10 50 200 1000
1,2,3,4,7,8-HxCDF............................. 2.5 10 50 200 1000
1,2,3,6,7,8-HxCDF............................. 2.5 10 50 200 1000
1,2,3,7,8,9-HxCDF............................. 2.5 10 50 200 1000
2,3,4,6,7,8-HxCDF............................. 2.5 10 50 200 1000
1,2,3,4,6,7,8-HpCDD........................... 2.5 10 50 200 1000
1,2,3,4,6,7,8-HpCDF........................... 2.5 10 50 200 1000
1,2,3,4,7,8,9-HpCDF........................... 2.5 10 50 200 1000
OCDD.......................................... 5.0 20 100 400 2000
OCDF.......................................... 5.0 20 100 400 2000
\13\ C12-2,3,7,8-TCDD......................... 100 100 100 100 100
\13\ C12-2,3,7,8-TCDF......................... 100 100 100 100 100
\13\ C12-1,2,3,7,8-PeCDD...................... 100 100 100 100 100
\13\ C12-PeCDF................................ 100 100 100 100 100
\13\ C12-2,3,4,7,8-PeCDF...................... 100 100 100 100 100
\13\ C12-1,2,3,4,7,8-HxCDD.................... 100 100 100 100 100
\13\ C12-1,2,3,6,7,8-HxCDD.................... 100 100 100 100 100
\13\ C12-1,2,3,4,7,8-HxCDF.................... 100 100 100 100 100
\13\ C12-1,2,3,6,7,8-HxCDF.................... 100 100 100 100 100
\13\ C12-1,2,3,7,8,9-HxCDF.................... 100 100 100 100 100
\13\ C12-1,2,3,4,6,7,8-HpCDD.................. 100 100 100 100 100
\13\ C12-1,2,3,4,6,7,8-HpCDF.................. 100 100 100 100 100
\13\ C12-1,2,3,4,7,8,9-Hp CDF................. 100 100 100 100 100
\13\ C12-OCDD................................. 200 200 200 200 200
Cleanup Standard:
\37\ C14-2,3,7,8-TCDD..................... 0.5 2 10 40 200
Internal Standards:
\13\ C12-1,2,3,4-TCDD......................... 100 100 100 100 100
\13\ C12-1,2,3,7,8,9-HxCDD.................... 100 100 100 100 100
----------------------------------------------------------------------------------------------------------------
Table 5--GC Retention Time Window Defining Solution and Isomer Specificity Test Standard (Section 7.15)
----------------------------------------------------------------------------------------------------------------
DB-5 column GC retention-time window defining solution
-----------------------------------------------------------------------------------------------------------------
CDD/CDF First eluted Last eluted
----------------------------------------------------------------------------------------------------------------
TCDF................................. 1,3,6,8-.................................. 1,2,8,9-
TCDD................................. 1,3,6,8-.................................. 1,2,8,9-
PeCDF................................ 1,3,4,6,8-................................ 1,2,3,8,9-
PeCDD................................ 1,2,4,7,9-................................ 1,2,3,8,9-
HxCDF................................ 1,2,3,4,6,8-.............................. 1,2,3,4,8,9-
HxCDD................................ 1,2,4,6,7,9-.............................. 1,2,3,4,6,7-
HpCDF................................ 1,2,3,4,6,7,8-............................ 1,2,3,4,7,8,9-
[[Page 295]]
HpCDD................................ 1,2,3,4,6,7,9-............................ 1,2,3,4,6,7,8-
----------------------------------------------------------------------------------------------------------------
DB-5 Column TCDD Specificity Test Standard
1,2,3,7=1,2,3,8-TCDD
2,3,7,8-TCDD
1,2,3,9-TCDD
DB-225 Column TCDF Isomer Specificity Test Standard
2,3,4,7-TCDF
2,3,7,8-TCDF
1,2,3,9-TCDF
Table 6--Acceptance Criteria for Performance Tests When All CDDS/CDFS Are Tested \1\
----------------------------------------------------------------------------------------------------------------
IPR \2,3\
CDD/CDF Test conc. ---------------------------- OPR (ng/mL) VER (ng/mL)
(ng/mL) s (ng/mL) X (ng/mL)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD............................... 10 2.8 8.3-12.9 6.7-15.8 7.8-12.9
2,3,7,8-TCDF............................... 10 2.0 8.7-13.7 7.5-15.8 8.4-12.0
1,2,3,7,8-PeCDD............................ 50 7.5 38-66 35-71 39-65
1,2,3,7,8-PeCDF............................ 50 7.5 43-62 40-67 41-60
2,3,4,7,8-PeCDF............................ 50 8.6 36-75 34-80 41-61
1,2,3,4,7,8-HxCDD.......................... 50 9.4 39-76 35-82 39-64
1,2,3,6,7,8-HxCDD.......................... 50 7.7 42-62 38-67 39-64
1,2,3,7,8,9-HxCDD.......................... 50 11.1 37-71 32-81 41-61
1,2,3,4,7,8-HxCDF.......................... 50 8.7 41-59 36-67 45-56
1,2,3,6,7,8-HxCDF.......................... 50 6.7 46-60 42-65 44-57
1,2,3,7,8,9-HxCDF.......................... 50 6.4 42-61 39-65 45-56
2,3,4,6,7,8-HxCDF.......................... 50 7.4 37-74 35-78 44-57
1,2,3,4,6,7,8-HpCDD........................ 50 7.7 38-65 35-70 43-58
1,2,3,4,6,7,8-HpCDF........................ 50 6.3 45-56 41-61 45-55
1,2,3,4,7,8,9-HpCDF........................ 50 8.1 43-63 39-69 43-58
OCDD....................................... 100 19 89-127 78-144 79-126
OCDF....................................... 100 27 74-146 63-170 63-159
\13\C12-2,3,7,8-TCDD....................... 100 37 28-134 20-175 82-121
\13\C12-2,3,7,8-TCDF....................... 100 35 31-113 22-152 71-140
\13\C12-1,2,3,7,8-PeCDD.................... 100 39 27-184 21-227 62-160
\13\C12-1,2,3,7,8-PeCDF.................... 100 34 27-156 21-192 76-130
\13\C12-2,3,4,7,8-PeCDF.................... 100 38 16-279 13-328 77-130
\13\C12-1,2,3,4,7,8-HxCDD.................. 100 41 29-147 21-193 85-117
\13\C12-1,2,3,6,7,8-HxCDD.................. 100 38 34-122 25-163 85-118
\13\C12-1,2,3,4,7,8-HxCDF.................. 100 43 27-152 19-202 76-131
\13\C12-1,2,3,6,7,8-HxCDF.................. 100 35 30-122 21-159 70-143
\13\C12-1,2,3,7,8,9-HxCDF.................. 100 40 24-157 17-205 74-135
\13\C12-2,3,4,6,7,8,-HxCDF................. 100 37 29-136 22-176 73-137
\13\C12-1,2,3,4,6,7,8-HpCDD................ 100 35 34-129 26-166 72-138
\13\C12-1,2,3,4,6,7,8-HpCDF................ 100 41 32-110 21-158 78-129
\13\C12-1,2,3,4,7,8,9-HpCDF................ 100 40 28-141 20-186 77-129
\13\C12-OCDD............................... 200 95 41-276 26-397 96-415
\37\Cl4-2,3,7,8-TCDD....................... 10 3.6 3.9-15.4 3.1-19.1 7.9-12.7
----------------------------------------------------------------------------------------------------------------
\1\ All specifications are given as concentration in the final extract, assuming a 20 [micro]L volume.
\2\ s = standard deviation of the concentration.
\3\ X = average concentration.
Table 6a--Acceptance Criteria for Performance Tests When Only Tetra Compounds are Tested \1\
----------------------------------------------------------------------------------------------------------------
IPR \2,3\
CDD/CDF Test Conc. --------------------------- OPR (ng/mL) VER (ng/mL)
(ng/mL) s (ng/mL) X (ng/mL)
----------------------------------------------------------------------------------------------------------------
2,3,7,8-TCDD................................ 10 2.7 8.7-12.4 7.314.6 8.2-12.3
2,3,7,8-TCDF................................ 10 2.0 9.1-13.1 8.0-14.7 8.6-11.6
\13\C12-2,3,7,8-TCDD........................ 100 35 32-115 25-141 85-117
\13\C12-2,3,7,8-TCDF........................ 100 34 35-99 26-126 76-131
[[Page 296]]
\37\Cl4-2,3,7,8-TCDD........................ 10 3.4 4.5-13.4 3.7-15.8 8.3-12.1
----------------------------------------------------------------------------------------------------------------
\1\ All specifications are given as concentration in the final extract, assuming a 20 [micro]L volume.
\2\ s = standard deviation of the concentration.
\3\ X = average concentration.
Table 7--Labeled Compounds Recovery in Samples When all CDDS/CDFS are
Tested
------------------------------------------------------------------------
Labeled compound
Test conc. recovery
Compound (ng/mL) --------------------------
(ng/mL) \1\ (%)
------------------------------------------------------------------------
\13\C12-2,3,7,8-TCDD............ 100 25-164 25-164
\13\C12-2,3,7,8-TCDF............ 100 24-169 24-169
\13\C12-1,2,3,7,8-PeCDD......... 100 25-181 25-181
\13\C12-1,2,3,7,8-PeCDF......... 100 24-185 24-185
\13\C12-2,3,4,7,8-PeCDF......... 100 21-178 21-178
\13\C12-1,2,3,4,7,8-HxCDD....... 100 32-141 32-141
\13\C12-1,2,3,6,7,8-HxCDD....... 100 28-130 28-130
\13\C12-1,2,3,4,7,8-HxCDF....... 100 26-152 26-152
\13\C12-1,2,3,6,7,8-HxCDF....... 100 26-123 26-123
\13\C12-1,2,3,7,8,9-HxCDF....... 100 29-147 29-147
\13\C12-2,3,4,6,7,8-HxCDF....... 100 28-136 28-136
\13\C12-1,2,3,4,6,7,8-HpCDD..... 100 23-140 23-140
\13\C12-1,2,3,4,6,7,8-HpCDF..... 100 28-143 28-143
\13\C12-1,2,3,4,7,8,9-HpCDF..... 100 26-138 26-138
\13\C12-OCDD.................... 200 34-313 17-157
\37\Cl4-2,3,7,8-TCDD............ 10 3.5-19.7 35-197
------------------------------------------------------------------------
\1\ Specification given as concentration in the final extract, assuming
a 20-[micro]L volume.
Table 7a--Labeled Compound Recovery in Samples When Only Tetra Compounds
are Tested
------------------------------------------------------------------------
Labeled compound
Test conc. recovery
Compound (ng/mL) --------------------------
(ng/mL) \1\ (%)
------------------------------------------------------------------------
\13\C12-2,3,7,8-TCDD............ 100 31-137 31-137
\13\C12-2,3,7,8-TCDF............ 100 29-140 29-140
\37\Cl4-2,3,7,8-TCDD............ 10 4.2-16.4 42-164
------------------------------------------------------------------------
\1\ Specification given as concentration in the final extract, assuming
a 20 [micro]L volume.
Table 8--Descriptors, Exact M/Z's, M/Z Types, and Elemental Compositions of the CDDs and CDFs
----------------------------------------------------------------------------------------------------------------
Exact M/Z
Descriptor \1\ M/Z type Elemental composition Substance \2\
----------------------------------------------------------------------------------------------------------------
1........................ 292.9825 Lock C7F11.................... PFK
303.9016 M C12H4\35\Cl4O............ TCDF
305.8987 M=2 C12H4\35\Cl3\37\ClO...... TCDF
315.9419 M \13\C12H4\35\Cl4O........ TCDF \3\
317.9389 M=2 \13\C12H4\35\Cl3\37\ClO.. TCDF \3\
319.8965 M C12H4\35\Cl4O2........... TCDD
321.8936 M=2 C12H4\35\Cl3\37\ClO2..... TCDD
327.8847 M C12H4\37\Cl4O2........... TCDD \4\
330.9792 QC C7F13.................... PFK
331.9368 M \13\C12H4\35\Cl4O2....... TCDD \3\
333.9339 M=2 \13\C12H4\35\Cl3\37\ClO2. TCDD \3\
375.8364 M=2 C12H4\35\Cl5\37\ClO...... HxCDPE
2........................ 339.8597 M=2 C12H3\35\Cl4\37\ClO...... PeCDF
341.8567 M=4 C12H3\35\Cl3\37\Cl2O..... PeCDF
351.9000 M=2 \13\C12H3\35\Cl4\37\ClO.. PeCDF
353.8970 M=4 \13\C12H3\35\Cl3\37\Cl2O. PeCDF \3\
354.9792 Lock C9F13.................... PFK
355.8546 M=2 C12H3\35\Cl4\37\ClO2..... PeCDD
357.8516 M=4 C12H3\35\Cl3\37\Cl2O2.... PeCDD
[[Page 297]]
367.8949 M=2 \13\C12H3\35\Cl4\37\ClO2. PeCDD \3\
369.8919 M=4 \13\C12H3\35\Cl3\37\Cl2O2 PeCDD \3\
409.7974 M=2 C12H3\35\Cl6\37\ClO...... HpCDPE
3........................ 373.8208 M=2 C12H2\35\Cl5\37\ClO...... HxCDF
375.8178 M=4 C12H2\35\Cl4\37\Cl2O..... HxCDF
383.8639 M \13\C12H2\35\Cl6O........ HxCDF \3\
385.8610 M=2 \13\C12H2\35\Cl5\37\ClO.. HxCDF \3\
389.8157 M=2 C12H2\35\Cl5\37\ClO2..... HxCDD
391.8127 M=4 C12H2\35\Cl4\37\Cl2O2.... HxCDD
392.9760 Lock C9F15.................... PFK
401.8559 M=2 \13\C12H2\35\Cl5\37\ClO2. HxCDD \3\
403.8529 M=4 \13\C12H2\35\Cl4\37\Cl2O2 HxCDD \3\
430.9729 QC C9F17.................... PFK
445.7555 M=4 C12H2\35\Cl6\37\Cl2O..... OCDPE
4........................ 407.7818 M=2 C12H\35\Cl6\37\ClO....... HpCDF
409.7789 M=4 C12H\35\Cl5\37\Cl2O...... HpCDF
417.8253 M \13\C12H\35\Cl7O......... HpCDF \3\
419.8220 M=2 \13\C12H\35\Cl6\37\ClO... HpCDF \3\
423.7766 M=2 C12H\35\Cl6\37\ClO2...... HpCDD
425.7737 M=4 C12H\35\Cl5\37\Cl2O2..... HpCDD
430.9729 Lock C9F17.................... PFK
435.8169 M=2 \13\C12H\35\Cl6\37\ClO2.. HpCDD \3\
437.8140 M=4 \13\C12H\35\Cl5\37\Cl2O2. HpCDD \3\
479.7165 M=4 C12H\35\Cl7\37\Cl2O...... NCDPE
5........................ 441.7428 M=2 C12\35\Cl7\37\ClO........ OCDF
442.9728 Lock C10F17................... PFK
443.7399 M=4 C12\35\Cl6\37\Cl2O....... OCDF
457.7377 M=2 C12\35\Cl7\37\ClO2....... OCDD
459.7348 M=4 C12\35\Cl6\37\Cl2O2...... OCDD
469.7779 M=2 \13\C12\35\Cl7\37\ClO2... OCDD \3\
471.7750 M=4 \13\C12\35\Cl6\37\Cl2O2.. OCDD \3\
513.6775 M=4 C12\35\Cl8\37\Cl2O....... DCDPE
----------------------------------------------------------------------------------------------------------------
\1\ Nuclidic masses used:
H = 1.007825.
O = 15.994915.
C = 12.00000.
\35\Cl = 34.968853.
\13\C = 13.003355.
\37\Cl = 36.965903.
F = 18.9984.
\2\ TCDD = Tetrachlorodibenzo-p-dioxin.
PeCDD = Pentachlorodibenzo-p-dioxin.
HxCDD = Hexachlorodibenzo-p-dioxin.
HpCDD = Heptachlorodibenzo-p-dioxin.
OCDD = Octachlorodibenzo-p-dioxin.
HxCDPE = Hexachlorodiphenyl ether.
OCDPE = Octachlorodiphenyl ether.
DCDPE = Decachlorodiphenyl ether.
TCDF = Tetrachlorodibenzofuran.
PeCDF = Pentachlorodibenzofuran.
HxCDF = Hexachlorodibenzofuran.
HpCDF = Heptachlorodibenzofuran.
OCDF = Octachlorodibenzofuran.
HpCDPE = Heptachlorodiphenyl ether.
NCDPE = Nonachlorodiphenyl ether.
PFK = Perfluorokerosene.
\3\ Labeled compound.
\4\ There is only one m/z for \37\Cl4-2,3,7,8,-TCDD (cleanup standard).
Table 9--Theoretical Ion Abundance Ratios and QC Limits
----------------------------------------------------------------------------------------------------------------
QC limit \1\
Number of chlorine atoms M/Z's forming ratio Theoretical -------------------------
ratio Lower Upper
----------------------------------------------------------------------------------------------------------------
4 \2\................................... M/(M=2)........................ 0.77 0.65 0.89
5....................................... (M=2)/(M=4).................... 1.55 1.32 1.78
6....................................... (M=2)/(M=4).................... 1.24 1.05 1.43
6 \3\................................... M/(M=2)........................ 0.51 0.43 0.59
7....................................... (M=2)/(M=4).................... 1.05 0.88 1.20
7 \4\................................... M/(M=2)........................ 0.44 0.37 0.51
8....................................... (M=2)/(M=4).................... 0.89 0.76 1.02
----------------------------------------------------------------------------------------------------------------
\1\ QC limits represent 15% windows around the theoretical ion abundance ratios.
[[Page 298]]
\2\ Does not apply to \37\Cl4-2,3,7,8-TCDD (cleanup standard).
\3\ Used for \13\C12-HxCDF only.
\4\ Used for \13\C12-HpCDF only.
Table 10--Suggested Sample Quantities To Be Extracted for Various Matrices \1\
----------------------------------------------------------------------------------------------------------------
Quantity
Sample Matrix \2\ Example Percent solids Phase extracted
----------------------------------------------------------------------------------------------------------------
Single-phase:
Aqueous...................... Drinking water...... <1 (\3\)............... 1000 mL.
Groundwater
Treated wastewater
Solid........................ Dry soil............ 20 Solid............... 10 g.
Compost
Ash
Organic...................... Waste solvent....... <1 Organic............. 10 g.
Waste oil
Organic polymer
Tissue....................... Fish................ .............. Organic............. 10 g.
Human adipose
Multi-phase:
Liquid/Solid:
Aqueous/Solid............ Wet soil............ 1-30 Solid............... 10 g.
Untreated effluent..
Digested municipal
sludge.
Filter cake.........
Paper pulp..........
Organic/solid............ Industrial sludge... 1-100 Both................ 10 g.
Oily waste
Liquid/Liquid:
Aqueous/organic.......... In-process effluent. <1 Organic............. 10 g.
Untreated effluent
Drum waste
Aqueous/organic/solid.... Untreated effluent.. 1 Organic and solid... 10 g.
Drum waste
----------------------------------------------------------------------------------------------------------------
\1\ The quantity of sample to be extracted is adjusted to provide 10 g of solids (dry weight). One liter of
aqueous samples containing 1% solids will contain 10 g of solids. For aqueous samples containing greater than
1% solids, a lesser volume is used so that 10 g of solids (dry weight) will be extracted.
\2\ The sample matrix may be amorphous for some samples. In general, when the CDDs/CDFs are in contact with a
multiphase system in which one of the phases is water, they will be preferentially dispersed in or adsorbed on
the alternate phase because of their low solubility in water.
\3\ Aqueous samples are filtered after spiking with the labeled compounds. The filtrate and the materials
trapped on the filter are extracted separately, and the extracts are combined for cleanup and analysis.
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24.0 Glossary of Definitions and Purposes
These definitions and purposes are specific to this method but have
been conformed to common usage as much as possible.
24.1 Units of weight and Measure and Their Abbreviations.
24.1.1 Symbols:
[deg]C--degrees Celsius
[micro]L--microliter
[micro]m--micrometer
<--less than
--greater than
%--percent
24.1.2 Alphabetical abbreviations:
amp--ampere
cm--centimeter
g--gram
h--hour
D--inside diameter
in.--inch
L--liter
M--Molecular ion
m--meter
mg--milligram
min--minute
mL--milliliter
mm--millimeter
m/z--mass-to-charge ratio
[[Page 306]]
N--normal; gram molecular weight of solute divided by hydrogen
equivalent of solute, per liter of solution
OD--outside diameter
pg--picogram
ppb--part-per-billion
ppm--part-per-million
ppq--part-per-quadrillion
ppt--part-per-trillion
psig--pounds-per-square inch gauge
v/v--volume per unit volume
w/v--weight per unit volume
24.2 Definitions and Acronyms (in Alphabetical Order).
Analyte--A CDD or CDF tested for by this method. The analytes are
listed in Table 1.
Calibration Standard (CAL)--A solution prepared from a secondary
standard and/or stock solutions and used to calibrate the response of
the instrument with respect to analyte concentration.
Calibration Verification Standard (VER)--The mid-point calibration
standard (CS3) that is used in to verify calibration. See Table 4.
CDD--Chlorinated Dibenzo-p-ioxin--The isomers and congeners of
tetra-through octa-chlorodibenzo-p-dioxin.
CDF--Chlorinated Dibenzofuran--The isomers and congeners of tetra-
through octa-chlorodibenzofuran.
CS1, CS2, CS3, CS4, CS5--See Calibration standards and Table 4.
Field Blank--An aliquot of reagent water or other reference matrix
that is placed in a sample container in the laboratory or the field, and
treated as a sample in all respects, including exposure to sampling site
conditions, storage, preservation, and all analytical procedures. The
purpose of the field blank is to determine if the field or sample
transporting procedures and environments have contaminated the sample.
GC--Gas chromatograph or gas chromatography.
GPC--Gel permeation chromatograph or gel permeation chromatography.
HPLC--High performance liquid chromatograph or high performance
liquid chromatography.
HRGC--High resolution GC.
HRMS--High resolution MS.
IPR--Initial precision and recovery; four aliquots of the diluted
PAR standard analyzed to establish the ability to generate acceptable
precision and accuracy. An IPR is performed prior to the first time this
method is used and any time the method or instrumentation is modified.
K-D--Kuderna-Danish concentrator; a device used to concentrate the
analytes in a solvent.
Laboratory Blank--See method blank.
Laboratory Control sample (LCS)--See ongoing precision and recovery
standard (OPR).
Laboratory Reagent Blank--See method blank.
May--This action, activity, or procedural step is neither required
nor prohibited.
May Not--This action, activity, or procedural step is prohibited.
Method Blank--An aliquot of reagent water that is treated exactly as
a sample including exposure to all glassware, equipment, solvents,
reagents, internal standards, and surrogates that are used with samples.
The method blank is used to determine if analytes or interferences are
present in the laboratory environment, the reagents, or the apparatus.
Minimum Level (ML)--The level at which the entire analytical system
must give a recognizable signal and acceptable calibration point for the
analyte. It is equivalent to the concentration of the lowest calibration
standard, assuming that all method-specified sample weights, volumes,
and cleanup procedures have been employed.
MS--Mass spectrometer or mass spectrometry.
Must--This action, activity, or procedural step is required.
OPR--Ongoing precision and recovery standard (OPR); a laboratory
blank spiked with known quantities of analytes. The OPR is analyzed
exactly like a sample. Its purpose is to assure that the results
produced by the laboratory remain within the limits specified in this
method for precision and recovery.
PAR--Precision and recovery standard; secondary standard that is
diluted and spiked to form the IPR and OPR.
PFK--Perfluorokerosene; the mixture of compounds used to calibrate
the exact m/z scale in the HRMS.
Preparation Blank--See method blank.
Primary Dilution Standard--A solution containing the specified
analytes that is purchased or prepared from stock solutions and diluted
as needed to prepare calibration solutions and other solutions.
Quality Control Check Sample (QCS)--A sample containing all or a
subset of the analytes at known concentrations. The QCS is obtained from
a source external to the laboratory or is prepared from a source of
standards different from the source of calibration standards. It is used
to check laboratory performance with test materials prepared external to
the normal preparation process.
Reagent Water--Water demonstrated to be free from the analytes of
interest and potentially interfering substances at the method detection
limit for the analyte.
Relative Standard Deviation (RSD)--The standard deviation times 100
divided by the mean. Also termed ``coefficient of variation.''
RF--Response factor. See Section 10.6.1.
RR--Relative response. See Section 10.5.2.
RSD--See relative standard deviation.
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SDS--Soxhlet/Dean-Stark extractor; an extraction device applied to
the extraction of solid and semi-solid materials (Reference 7).
Should--This action, activity, or procedural step is suggested but
not required.
SICP--Selected ion current profile; the line described by the signal
at an exact m/z.
SPE--Solid-phase extraction; an extraction technique in which an
analyte is extracted from an aqueous sample by passage over or through a
material capable of reversibly adsorbing the analyte. Also termed
liquid-solid extraction.
Stock Solution--A solution containing an analyte that is prepared
using a reference material traceable to EPA, the National Institute of
Science and Technology (NIST), or a source that will attest to the
purity and authenticity of the reference material.
TCDD--Tetrachlorodibenzo-p-dioxin.
TCDF--Tetrachlorodibenzofuran.
VER--See calibration verification standard.
Method 1624 Revision B--Volatile Organic Compounds by Isotope Dilution
GC/MS
1. Scope and Application
1.1 This method is designed to determine the volatile toxic organic
pollutants associated with the 1976 Consent Decree and additional
compounds amenable to purge and trap gas chromatography-mass
spectrometry (GC/MS).
1.2 The chemical compounds listed in table 1 may be determined in
municipal and industrial discharges by this method. The methmd is
designed to meet the survey requirements of Effluent Guidelines Division
(EGD) and the National Pollutants Discharge Elimination System (NPDES)
under 40 CFR 136.1 and 136.5. Any modifications of this method, beyond
those expressly permitted, shall be considered as major modifications
subject to application and approval of alternate test procedures under
40 CFR 136.4 and 136.5.
1.3 The detection limit of this method is usually dependent on the
level of interferences rather than instrumental limitations. The limits
in table 2 represent the minimum quantity that can be detected with no
interferences present.
1.4 The GC/MS portions of this method are for use only by analysts
experienced with GC/MS or under the close supervision of such qualified
persons. Laboratories unfamiliar with the analyses of environmental
samples by GC/MS should run the performance tests in reference 1 before
beginning.
2. Summary of Method
2.1 Stable isotopically labeled analogs of the compounds of interest
are added to a 5 mL water sample. The sample is purged at 20-25 [deg]C
with an inert gas in a specially designed chamber. The volatile organic
compounds are transferred from the aqueous phase into the gaseous phase
where they are passed into a sorbent column and trapped. After purging
is completed, the trap is backflushed and heated rapidly to desorb the
compounds into a gas chromatograph (GC). The compounds are separated by
the GC and detected by a mass spectrometer (MS) (references 2 and 3).
The labeled compounds serve to correct the variability of the analytical
technique.
2.2 Identification of a compound (qualitative analysis) is performed
by comparing the GC retention time and the background corrected
characteristic spectral masses with those of authentic standards.
2.3 Quantitative analysis is performed by GC/MS using extracted ion
current profile (EICP) areas. Isotope dilution is used when labeled
compounds are available; otherwise, an internal standard method is used.
2.4 Quality is assured through reproducible calibration and testing
of the purge and trap and GC/MS systems.
3. Contamination and Interferences
3.1 Impurities in the purge gas, organic compounds out-gassing from
the plumbing upstream of the trap, and solvent vapors in the laboratory
account for the majority of contamination problems. The analytical
system is demonstrated to be free from interferences under conditions of
the analysis by analyzing blanks initially and with each sample lot
(samples analyzed on the same 8 hr shift), as described in Section 8.5.
3.2 Samples can be contaminated by diffusion of volatile organic
compounds (particularly methylene chloride) through the bottle seal
during shipment and storage. A field blank prepared from reagent water
and carried through the sampling and handling protocol serves as a check
on such contamination.
3.3 Contamination by carry-over can occur when high level and low
level samples are analyzed sequentially. To reduce carry-over, the
purging device and sample syringe are rinsed between samples with
reagent water. When an unusually concentrated sample is encountered, it
is followed by analysis of a reagent water blank to check for carry-
over. For samples containing large amounts of water soluble materials,
suspended solids, high boiling compounds, or high levels or purgeable
compounds, the purge device is washed with soap solution, rinsed with
tap and distilled water, and dried in an oven at 100-125 [deg]C. The
trap and other parts of the system are also subject to contamination;
therefore, frequent bakeout and purging of the entire system may be
required.
3.4 Interferences resulting from samples will vary considerably from
source to source, depending on the diversity of the industrial complex
or municipality being sampled.
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4. Safety
4.1 The toxicity or carcinogenicity of each compound or reagent used
in this method has not been precisely determined; however, each chemical
compound should be treated as a potential health hazard. Exposure to
these compounds should be reduced to the lowest possible level. The
laboratory is responsible for maintaining a current awareness file of
OSHA regulations regarding the safe handling of the chemicals specified
in this method. A reference file of data handling sheets should also be
made available to all personnel involved in these analyses. Additional
information on laboratory safety can be found in references 4-6.
4.2 The following compounds covered by this method have been
tentatively classified as known or suspected human or mammalian
carcinogens: benzene, carbon tetrachloride, chloroform, and vinyl
chloride. Primary standards of these toxic compounds should be prepared
in a hood, and a NIOSH/MESA approved toxic gas respirator should be worn
when high concentrations are handled.
5. Apparatus and Materials
5.1 Sample bottles for discrete sampling.
5.1.1 Bottle--25 to 40 mL with screw cap (Pierce 13075, or
equivalent). Detergent wash, rinse with tap and distilled water, and dry
at 105 [deg]C for one hr minimum before use.
5.1.2 Septum--Teflon-faced silicone (Pierce 12722, or equivalent),
cleaned as above and baked at 100-200 [deg]C, for one hour minimum.
5.2 Purge and trap device--consists of purging device, trap, and
desorber. Complete devices are commercially available.
5.2.1 Purging device--designed to accept 5 mL samples with water
column at least 3 cm deep. The volume of the gaseous head space between
the water and trap shall be less than 15 mL. The purge gas shall be
introduced less than 5 mm from the base of the water column and shall
pass through the water as bubbles with a diameter less than 3 mm. The
purging device shown in Figure 1 meets these criteria.
5.2.2 Trap--25 to 30 cm x 2.5 mm i.d. minimum, containing the
following:
5.2.2.1 Methyl silicone packing--one 0.2 cm, 3
percent OV-1 on 60/80 mesh Chromosorb W, or equivalent.
5.2.2.2 Porous polymer--15 1.0 cm, Tenax GC
(2,6-diphenylene oxide polymer), 60/80 mesh, chromatographic grade, or
equivalent.
5.2.2.3 Silica gel--8 1.0 cm, Davison
Chemical, 35/60 mesh, grade 15, or equivalent. The trap shown in Figure
2 meets these specifications.
5.2.3 Desorber--shall heat the trap to 175 5
[deg]C in 45 seconds or less. The polymer section of the trap shall not
exceed 180 [deg]C, and the remaining sections shall not exceed 220
[deg]C. The desorber shown in Figure 2 meets these specifications.
5.2.4 The purge and trap device may be a separate unit or coupled to
a GC as shown in Figures 3 and 4.
5.3 Gas chromatograph--shall be linearly temperature programmable
with initial and final holds, shall contain a glass jet separator as the
MS interface, and shall produce results which meet the calibration
(Section 7), quality assurance (Section 8), and performance tests
(Section 11) of this method.
5.3.1 Column--2.8 0.4 m x 2 0.5 mm i. d. glass, packekd with one percent SP-1000 on
Carbopak B, 60/80 mesh, or equivalent.
5.4 Mass spectrometer--70 eV electron impact ionization; shall
repetitively scan from 20 to 250 amu every 2-3 seconds, and produce a
unit resolution (valleys between m/z 174-176 less than 10 percent of the
height of the m/z 175 peak), background corrected mass spectrum from 50
ng 4-bromo-fluorobenzene (BFB) injected into the GC. The BFB spectrum
shall meet the mass-intensity criteria in Table 3. All portions of the
GC column, transfer lines, and separator which connect the GC column to
the ion source shall remain at or above the column temperature during
analysis to preclude condensation of less volatile compounds.
5.5 Data system--shall collect and record MS data, store mass
intensity data in spectral libraries, process GC/MS data and generate
reports, and shall calculate and record response factors.
5.5.1 Data acquisition--mass spectra shall be collected continuously
throughout the analysis and stored on a mass storage device.
5.5.2 Mass spectral libraries--user created libraries containing
mass spectra obtained from analysis of authentic standards shall be
employed to reverse search GC/MS runs for the compounds of interest
(Section 7.2).
5.5.3 Data processing--the data system shall be used to search,
locate, identify, and quantify the compounds of interest in each GC/MS
analysis. Software routines shall be employed to compute retention times
and EICP areas. Displays of spectra, mass chromatograms, and library
comparisons are required to verify results.
5.5.4 Response factors and multipoint calibrations--the data system
shall be used to record and maintain lists of response factors (response
ratios for isotope dilution) and generate multi-point calibration curves
(Section 7). Computations of relative standard deviation (coefficient of
variation) are useful for testing calibration linearity. Statistics on
initial and on-going performance shall be maintained (Sections 8 and
11).
5.6 Syringes--5 mL glass hypodermic, with Luer-lok tips.
5.7 Micro syringes--10, 25, and 100 uL.
5.8 Syringe valves--2-way, with Luer ends (Telfon or Kel-F).
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5.9 Syringe--5 mL, gas-tight, with shut-off valve.
5.10 Bottles--15 mL., screw-cap with Telfon liner.
5.11 Balance--analytical, capable of weighing 0.1 mg.
6. Reagents and Standards
6.1 Reagent water--water in which the compounds of interest and
interfering compounds are not detected by this method (Section 11.7). It
may be generated by any of the following methods:
6.1.1 Activated carbon--pass tap water through a carbon bed (Calgon
Filtrasorb-300, or equivalent).
6.1.2 Water purifier--pass tap water through a purifier (Millipore
Super Q, or equivalent).
6.1.3 Boil and purge--heat tap water to 90-100 [deg]C and bubble
contaminant free inert gas through it for approx one hour. While still
hot, transfer the water to screw-cap bottles and seal with a Teflon-
lined cap.
6.2 Sodium thiosulfate--ACS granular.
6.3 Methanol--pesticide quality or equivalent.
6.4 Standard solutions--purchased as solution or mixtures with
certification to their purity, concentration, and authenticity, or
prepared from materials of known purity and composition. If compound
purity is 96 percent or greater, the weight may be used without
correction to calculate the concentration of the standard.
6.5 Preparation of stock solutions--prepare in methanol using liquid
or gaseous standards per the steps below. Observe the safety precautions
given in Section 4.
6.5.1 Place approx 9.8 mL of methanol in a 10 mL ground glass
stoppered volumetric flask. Allow the flask to stand unstoppered for
approximately 10 minutes or until all methanol wetted surfaces have
dried. In each case, weigh the flask, immediately add the compound, then
immediately reweigh to prevent evaporation losses from affecting the
measurement.
6.5.1.1 Liquids--using a 100 [micro]L syringe, permit 2 drops of
liquid to fall into the methanol without contacting the leck of the
flask. Alternatively, inject a known volume of the compound into the
methanol in the flask using a micro-syringe.
6.5.1.2 Gases (chloromethane, bromomethane, chloroethane, vinyl
chloride)--fill a valved 5 mL gas-tight syringe with the compound. Lower
the needle to approximately 5 mm above the methanol meniscus. Slowly
introduce the compound above the surface of the meniscus. The gas will
dissolve rapidly in the methanol.
6.5.2 Fill the flask to volume, stopper, then mix by inverting
several times. Calculate the concentration in mg/mL ([micro]g/[micro]L )
from the weight gain (or density if a known volume was injected).
6.5.3 Transfer the stock solution to a Teflon sealed screw-cap-
bottle. Store, with minimal headspace, in the dark at -10 to -20 [deg]C.
6.5.4 Prepare fresh standards weekly for the gases and 2-
chloroethylvinyl ether. All other standards are replaced after one
month, or sooner if comparison with check standards indicate a change in
concentration. Quality control check standards that can be used to
determine the accuracy of calibration standards are available from the
US Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio.
6.6 Labeled compound spiking solution--from stock standard solutions
prepared as above, or from mixtures, prepare the spiking solution to
contain a concentration such that a 5-10 [micro]L spike into each 5 mL
sample, blank, or aqueous standard analyzed will result in a
concentration of 20 [micro]g/L of each labeled compound. For the gases
and for the water soluble compounds (acrolein, acrylonitrile, acetone,
diethyl ether, and MEK), a concentration of 100 [micro]g/L may be used.
Include the internal standards (Section 7.5) in this solution so that a
concentration of 20 [micro]g/L in each sample, blank, or aqueous
standard will be produced.
6.7 Secondary standards--using stock solutions, prepare a secondary
standard in methanol to contain each pollutant at a concentration of 500
[micro]g/mL For the gases and water soluble compounds (Section 6.6), a
concentration of 2.5 mg/mL may be used.
6.7.1 Aqueous calibration standards--using a 25 [micro]L syringe,
add 20 [micro]L of the secondary standard (Section 6.7) to 50, 100, 200,
500, and 1000 mL of reagent water to produce concentrations of 200, 100,
50, 20, and 10 [micro]g/L, respectively. If the higher concentration
standard for the gases and water soluble compounds was chosen (Section
6.6), these compounds will be at concentrations of 1000, 500, 250, 100,
and 50 [micro]g/L in the aqueous calibration standards.
6.7.2 Aqueous performance standard--an aqueous standard containing
all pollutants, internal standards, labeled compounds, and BFB is
prepared daily, and analyzed each shift to demonstrate performance
(Section 11). This standard shall contain either 20 or 100 [micro]g/L of
the labeled and pollutant gases and water soluble compounds, 10
[micro]g/L BFB, and 20 [micro]g/L of all other pollutants, labeled
compounds, and internal standards. It may be the nominal 20 [micro]g/L
aqueous calibration standard (Section 6.7.1).
6.7.3 A methanolic standard containing all pollutants and internal
standards is prepared to demonstrate recovery of these compounds when
syringe injection and purge and trap analyses are compared. This
standard shall contain either 100 [micro]g/mL or 500 [micro]g/mL of the
gases and water soluble compounds, and 100 [micro]g/mL of the remaining
pollutants
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and internal standards (consistent with the amounts in the aqueous
performance standard in 6.7.2).
6.7.4 Other standards which may be needed are those for test of BFB
performance (Section 7.1) and for collection of mass spectra for storage
in spectral libraries (Section 7.2).
7. Calibration
7.1 Assemble the gas chromatographic apparatus and establish
operating conditions given in table 2. By injecting standards into the
GC, demonstrate that the analytical system meets the detection limits in
table 2 and the mass-intensity criteria in table 3 for 50 ng BFB.
7.2 Mass spectral libraries--detection and identification of the
compound of interest are dependent upon the spectra stored in user
created libraries.
7.2.1 Obtain a mass spectrum of each pollutant and labeled compound
and each internal standard by analyzing an authentic standard either
singly or as part of a mixture in which there is no interference between
closely eluted components. That only a single compound is present is
determined by examination of the spectrum. Fragments not attributable to
the compound under study indicate the presence of an interfering
compound. Adjust the analytical conditions and scan rate (for this test
only) to produce an undistorted spectrum at the GC peak maximum. An
undistorted spectrum will usually be obtained if five complete spectra
are collected across the upper half of the GC peak. Software algorithms
designed to ``enhance'' the spectrum may eliminate distortion, but may
also eliminate authentic m/z's or introduce other distortion.
7.2.3 The authentic reference spectrum is obtained under BFB tuning
conditions (Section 7.1 and table 3) to normalize it to spectra from
other instruments.
7.2.4 The spectrum is edited by saving the 5 most intense mass
spectral peaks and all other mass spectral peaks greater than 10 percent
of the base peak. This spectrum is stored for reverse search and for
compound confirmation.
7.3 Assemble the purge and trap device. Pack the trap as shown in
Figure 2 and condition overnight at 170-180 [deg]C by backflushing with
an inert gas at a flow rate of 20-30 mL/min. Condition traps daily for a
minimum of 10 minutes prior to use.
7.3.1 Analyze the aqueous performance standard (Section 6.7.2)
according to the purge and trap procedure in Section 10. Compute the
area at the primary m/z (table 4) for each compound. Compare these areas
to those obtained by injecting one [micro]L of the methanolic standard
(Section 6.7.3) to determine compound recovery. The recovery shall be
greater than 20 percent for the water soluble compounds, and 60-110
percent for all other compounds. This recovery is demonstrated initially
for each purge and trap GC/MS system. The test is repeated only if the
purge and trap or GC/MS systems are modified in any way that might
result in a change in recovery.
7.3.2 Demonstrate that 100 ng toluene (or toluene-d8) produces an
area at m/z 91 (or 99) approx one-tenth that required to exceed the
linear range of the system. The exact value must be determined by
experience for each instrument. It is used to match the calibration
range of the instrument to the analytical range and detection limits
required.
7.4 Calibration by isotope dilution--the isotope dilution approach
is used for the purgeable organic compounds when appropriate labeled
compounds are available and when interferences do not preclude the
analysis. If labeled compounds are not available, or interferences are
present, internal standard methods (Section 7.5 or 7.6) are used. A
calibration curve encompassing the concentration range of interest is
prepared for each compound determined. The relative response (RR) vs
concentration ([micro]g/L) is plotted or computed using a linear
regression. An example of a calibration curve for toluene using toluene-
d8 is given in figure 5. Also shown are the 10
percent error limits (dotted lines). Relative response is determined
according to the procedures described below. A minimum of five data
points are required for calibration (Section 7.4.4).
7.4.1 The relative response (RR) of pollutant to labeled compound is
determined from isotope ratio values calculated from acquired data.
Three isotope ratios are used in this process:
RX=the isotope ratio measured in the pure pollutant
(figure 6A).
Ry=the isotope ratio of pure labeled compound (figure
6B).
Rm=the isotope ratio measured in the analytical mixture
of the pollutant and labeled compounds (figure 6C).
The correct way to calculate RR is: RR=(Ry-Rm)
(RX+1)/(Rm-RX)(Ry+1) If
Rm is not between 2Ry and 0.5RX, the
method does not apply and the sample is analyzed by internal or external
standard methods (Section 7.5 or 7.6).
7.4.2 In most cases, the retention times of the pollutant and
labeled compound are the same and isotope ratios (R's) can be calculated
from the EICP areas, where: R=(area at m1/z)/(area at
m2/z) If either of the areas is zero, it is assigned a value
of one in the calculations; that is, if: area of m1/z=50721,
and area of m2/z=0, then R=50721/1=50720. The m/z's are
always selected such that RXRy. When
there is a difference in retention times (RT) between the pollutant and
labeled compounds, special precautions are required to determine the
isotope ratios.
RX, Ry, and Rm are defined as
follows:
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RX=[area m1/z (at RT1)]/1
Ry=1/[area m2/z (at RT2)]
Rm=[area m1/z (at RT1)]/[area
m2/z (at RT2)]
7.4.3 An example of the above calculations can be taken from the
data plotted in figure 6 for toluene and toluene-d8. For these data,
RX=168920/1=168900, Ry=1/60960=0.00001640, and
Rm=96868/82508=1.174. The RR for the above data is then
calculated using the equation given in Section 7.4.1. For the example,
RR=1.174.
Note: Not all labeled compounds elute before their pollutant
analogs.
7.4.4 To calibrate the analytical system by isotope dilution,
analyze a 5 mL aliquot of each of the aqueous calibration standards
(Section 6.7.1) spiked with an appropriate constant amount of the
labeled compound spiking solution (Section 6.6), using the purge and
trap procedure in section 10. Compute the RR at each concentration.
7.4.5 Linearity--if the ratio of relative response to concentration
for any compound is constant (less than 20 percent coefficient of
variation) over the 5 point calibration range, an averaged relative
response/concentration ratio may be used for that compound; otherwise,
the complete calibration curve for that compound shall be used over the
5 point calibration range.
7.5 Calibration by internal standard--used when criteria for isotope
dilution (Section 7.4) cannot be met. The method is applied to
pollutants having no labeled analog and to the labeled compounds. The
internal standards used for volatiles analyses are bromochloromethane,
2-bromo-1-chloropropane, and 1,4-dichlorobutane. Concentrations of the
labeled compounds and pollutants without labeled analogs are computed
relative to the nearest eluted internal standard, as shown in table 2.
7.5.1 Response factors--calibration requires the determination of
response factors (RF) which are defined by the following equation:
RF=(AsxCis)/(AisxCs),
where As is the EICP area at the characteristic m/z for the
compound in the daily standard. Ais is the EICP area at the
characteristic m/z for the internal standard.
Cis is the concentration (ug/L) of the internal standard
Cs is the concentration of the pollutant in the daily
standard.
7.5.2 The response factor is determined at 10, 20, 50, 100, and 200
ug/L for the pollutants (optionally at five times these concentrations
for gases and water soluble pollutants--see Section 6.7), in a way
analogous to that for calibration by isotope dilution (Section 7.4.4).
The RF is plotted against concentration for each compound in the
standard (Cs) to produce a calibration curve.
7.5.3 Linearity--if the response factor (RF) for any compound is
constant (less than 35 percent coefficient of variation) over the 5
point calibration range, an averaged response factor may be used for
that compound; otherwise, the complete calibration curve for that
compound shall be used over the 5 point range.
7.6 Combined calibration--by adding the isotopically labeled
compounds and internal standards (Section 6.6) to the aqueous
calibration standards (Section 6.7.1), a single set of analyses can be
used to produce calibration curves for the isotope dilution and internal
standard methods. These curves are verified each shift (Section 11.5) by
purging the aqueous performance standard (Section 6.7.2). Recalibration
is required only if calibration and on-going performance (Section 11.5)
criteria cannot be met.
8. Quality Assurance/Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality assurance program. The minimum requirements of this
program consist of an initial demonstration of laboratory capability,
analysis of samples spiked with labeled compounds to evaluate and
document data quality, and analysis of standards and blanks as tests of
continued performance. Laboratory performance is compared to established
performance criteria to determine if the results of analyses meet the
performance characteristics of the method.
8.1.1 The analyst shall make an initial demonstration of the ability
to generate acceptable accuracy and precision with this method. This
ability is established as described in Section 8.2.
8.1.2 The analyst is permitted to modify this method to improve
separations or lower the costs of measurements, provided all performance
specifications are met. Each time a modification is made to the method,
the analyst is required to repeat the procedure in Section 8.2 to
demonstrate method performance.
8.1.3 Analyses of blanks are required to demonstrate freedom from
contamination and that the compounds of interest and interfering
compounds have not been carried over from a previous analysis (Section
3). The procedures and criteria for analysis of a blank are described in
Sections 8.5 and 11.7.
8.1.4 The laboratory shall spike all samples with labeled compounds
to monitor method performance. This test is described in Section 8.3.
When results of these spikes indicate atypical method performance for
samples, the samples are diluted to bring method performance within
acceptable limits (Section 14.2).
8.1.5 The laboratory shall, on an on-going basis, demonstrate
through the analysis of the aqueous performance standard (Section 6.7.2)
that the analysis system is in control. This procedure is described in
Sections 11.1 and 11.5.
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8.1.6 The laboratory shall maintain records to define the quality of
data that is generated. Development of accuracy statements is described
in Sections 8.4 and 11.5.2.
8.2 Initial precision and accuracy--to establish the ability to
generate acceptable precision and accuracy, the analyst shall perform
the following operations:
8.2.1 Analyze two sets of four 5-mL aliquots (8 aliquots total) of
the aqueous performance standard (Section 6.7.2) according to the method
beginning in Section 10.
8.2.2 Using results of the first set of four analyses in Section
8.2.1, compute the average recovery (X) in [micro]g/L and the standard
deviation of the recovery (s) in [micro]g/L for each compound, by
isotope dilution for polluitants with a labeled analog, and by internal
standard for labeled compounds and pollutants with no labeled analog.
8.2.3 For each compound, compare s and X with the corresponding
limits for initial precision and accuracy found in table 5. If s and X
for all compounds meet the acceptance criteria, system performance is
acceptable and analysis of blanks and samples may begin. If individual X
falls outside the range for accuracy, system performance is unacceptable
for that compound.
Note: The large number of compounds in table 5 present a substantial
probability that one or more will fail one of the acceptance criteria
when all compoulds are analyzed. To determine if the analytical system
is out of control, or if the failure can be attributed to probability,
proceed as follows:
8.2.4 Using the results of the second set of four analyses, compute
s and X for only those compounds which failed the test of the first set
of four analyses (Section 8.2.3). If these compounds now pass, system
performance is acceptable for all compounds and analysis of blanks and
samples may begin. If, however, any of the same compounds fail again,
the analysis system is not performing properly for the compound(s) in
question. In this event, correct the problem and repeat the entire test
(Section 8.2.1).
8.3 The laboratory shall spike all samples with labeled compounds to
assess method performance on the sample matrix.
8.3.1 Spike and analyze each sample according to the method
beginning in Section 10.
8.3.2 Compute the percent recovery (P) of the labeled compounds
using the internal standard method (Section 7.5).
8.3.3 Compare the percent recovery for each compound with the
corresponding labeled compound recovery limit in table 5. If the
recovery of any compound falls outside its warning limit, method
performance is unacceptable for that compound in that sample. Therefore,
the sample matrix is complex and the sample is to be diluted and
reanalyzed, per Section 14.2.
8.4 As part of the QA program for the laboratory, method accuracy
for wastewater samples shall be assessed and records shall be
maintained. After the analysis of five wastewater samples for which the
labeled compounds pass the tests in Section 8.3.3, compute the average
percent recovery (P) and the standard deviation of the percent recovery
(sp) for the labeled compounds only. Express the accuracy
assessment as a percent recovery interval from P-2sp to
P+2sp. For example, if P=90% and sp=10%, the
accuracy interval is expressed as 70-110%. Update the accuracy
assessment for each compound on a regular basis (e.g. after each 5-10
new accuracy measurements).
8.5 Blanks--reagent water blanks are analyzed to demonstrate freedom
from carry-over (Section 3) and contamination.
8.5.1 The level at which the purge and trap system will carry
greater than 5 [micro]g/L of a pollutant of interest (table 1) into a
succeeding blank shall be determined by analyzing successively larger
concentrations of these compounds. When a sample contains this
concentration or more, a blank shall be analyzed immediately following
this sample to demonstrate no carry-over at the 5 [micro]g/L level.
8.5.2 With each sample lot (samples analyzed on the same 8 hr
shift), a blank shall be analyzed immediately after analysis of the
aqueous performance standard (Section 11.1) to demonstrate freedom from
contamination. If any of the compounds of interest (table 1) or any
potentially interfering compound is found in a blank at greater than 10
[micro]g/L (assuming a response factor of 1 relative to the nearest
eluted internal standard for compounds not listed in table 1), analysis
of samples is halted until the source of contamination is eliminated and
a blank shows no evidence of contamination at this level.
8.6 The specifications contained in this method can be met if the
apparatus used is calibrated properly, then maintained in a calibrated
state.
The standards used for calibration (Section 7), calibration
verification (Section 11.5) and for initial (Section 8.2) and on-going
(Section 11.5) precision and accuracy should be identical, so that the
most precise results will be obtained. The GC/MS instrument in
particular will provide the most reproducible results if dedicated to
the settings and conditions required for the analyses of volatiles by
this method.
8.7 Depending on specific program requirements, field replicates may
be collected to determine the precision of the sampling technique, and
spiked samples may be required to determine the accuracy of the analysis
when internal or external standard methods are used.
[[Page 313]]
9. Sample Collection, Preservation, and Handling
9.1 Grab samples are collected in glass containers having a total
volume greater than 20 mL. Fill sample bottles so that no air bubbles
pass through the sample as the bottle is filled. Seal each bottle so
that no air bubbles are entrapped. Maintain the hermetic seal on the
sample bottle until time of analysis.
9.2 Samples are maintained at 0-4 [deg]C from the time of collection
until analysis. If the sample contains residual chlorine, add sodium
thiosulfate preservative (10 mg/40 mL) to the empty sample bottles just
prior to shipment to the sample site. EPA Methods 330.4 and 330.5 may be
used for measurement of residual chlorine (Reference 8). If preservative
has been added, shake bottle vigorously for one minute immediately after
filling.
9.3 Experimental evidence indicates that some aromatic compounds,
notably benzene, toluene, and ethyl benzene are susceptible to rapid
biological degradation under certain environmental conditions.
Refrigeration alone may not be adequate to preserve these compounds in
wastewaters for more than seven days. For this reason, a separate sample
should be collected, acidified, and analyzed when these aromatics are to
be determined. Collect about 500 mL of sample in a clean container.
Adjust the pH of the sample to about 2 by adding HCl (1+1) while
stirring. Check pH with narrow range (1.4 to 2.8) pH paper. Fill a
sample container as described in Section 9.1. If residual chlorine is
present, add sodium thiosulfate to a separate sample container and fill
as in Section 9.1.
9.4 All samples shall be analyzed within 14 days of collection.
10. Purge, Trap, and GC/MS Analysis
10.1 Remove standards and samples from cold storage and bring to 20-
25 [deg].
10.2 Adjust the purge gas flow rate to 40 4
mL/min. Attach the trap inlet to the purging device and set the valve to
the purge mode (figure 3). Open the syringe valve located on the purging
device sample introduction needle (figure 1).
10.3 Remove the plunger from a 5-mL syringe and attach a closed
syringe valve. Open the sample bottle and carefully pour the sample into
the syringe barrel until it overflows. Replace the plunger and compress
the sample. Open the syringe valve and vent any residual air while
adjusting the sample volume to 5.0 mL. Because this process of taking an
aliquot destroys the validity of the sample for future analysis, fill a
second syringe at this time to protect against possible loss of data.
Add an appropriate amount of the labeled compound spiking solution
(Section 6.6) through the valve bore, then close the valve.
10.4 Attach the syringe valve assembly to the syringe valve on the
purging device. Open both syringe valves and inject the sample into the
purging chamber.
10.5 Close both valves and purge the sample for 11.0 0.1 minutes at 20-25 [deg]C.
10.6 After the 11 minute purge time, attach the trap to the
chromatograph and set the purge and trap apparatus to the desorb mode
(figure 4). Desorb the trapped compounds into the GC column by heating
the trap to 170-180 [deg]C while backflushing with carrier gas at 20-60
mL/min for four minutes. Start MS data acquisition upon start of the
desorb cycle, and start the GC column temperature program 3 minutes
later. Table 1 summarizes the recommended operating conditions for the
gas chromatograph. Included in this table are retention times and
detection limits that were achieved under these conditions. Other
columns may be used provided the requirements in Section 8 can be met.
If the priority pollutant gases produce GC peaks so broad that the
precision and recovery specifications (Section 8.2) cannot be met, the
column may be cooled to ambient or sub-ambient temperatures to sharpen
these peaks.
10.7 While analysis of the desorbed compounds proceeds, empty the
purging chamber using the sample introduction syringe. Wash the chamber
with two 5-mL portions of reagent water. After the purging device has
been emptied, allow the purge gas to vent through the chamber until the
frit is dry, so that it is ready for the next sample.
10.8 After desorbing the sample for four minutes, recondition the
trap by returning to the purge mode. Wait 15 seconds, then close the
syringe valve on the purging device to begin gas flow through the trap.
Maintain the trap temperature at 170-180 [deg]C. After approximately
seven minutes, turn off the trap heater and open the syringe valve to
stop the gas flow through the trap. When cool, the trap is ready for the
next sample.
11. System Performance
11.1 At the beginning of each 8 hr shift during which analyses are
performed, system calibration and performance shall be verified for all
pollutants and labeled compounds. For these tests, analysis of the
aqueous performance standard (Section 6.7.2) shall be used to verify all
performance criteria. Adjustment and/or recalibration (per Section 7)
shall be performed until all performance criteria are met. Only after
all performance criteria are met may blanks and samples be analyzed.
11.2 BFB spectrum validity--the criteria in table 3 shall be met.
11.3 Retention times--the absolute retention times of all compounds
shall approximate those given in Table 2.
[[Page 314]]
11.4 GC resolution--the valley height between toluene and toluene-d8
(at m/z 91 and 99 plotted on the same graph) shall be less than 10
percent of the taller of the two peaks.
11.5 Calibration verification and on-going precision and accuracy--
compute the concentration of each polutant (Table 1) by isotope dilution
(Section 7.4) for those compmunds which have labeled analogs. Compute
the concentration of each pollutant (Table 1) which has no labeled
analog by the internal standard method (Section 7.5). Compute the
concentration of the labeled compounds by the internal standard method.
These concentrations are computed based on the calibration data
determined in Section 7.
11.5.1 For each pollutant and labeled compound, compare the
concentration with the corresponding limit for on-going accuracy in
Table 5. If all compmunds meet the acceptance criteria, system
performance is acceptable and analysis of blanks and samples may
continue. If any individual value falls outside the range given, system
performance is unacceptable for that compound.
Note: The large number of compounds in Table 5 present a substantial
probability that one or more will fail the acceptance criteria when all
compounds are analyzed. To determine if the analytical system is out of
control, or if the failure may be attributed to probability, proceed as
follows:
11.5.1.1 Analyze a second aliquot of the aqueous performance
standard (Section 6.7.2).
11.5.1.2 Compute the concentration for only those compounds which
failed the first test (Section 11.5.1). If these compounds now pass,
system performance is acceptable for all compounds and analyses of
blanks and samples may proceed. If, however, any of the compounds fail
again, the measurement system is not performing properly for these
compounds. In this event, locate and correct the problem or recalibrate
the system (Section 7), and repeat the entire test (Section 11.1) for
all compounds.
11.5.2 Add results which pass the specification in 11.5.1.2 to
initial (Section 8.2) and previous on-going data. Update QC charts to
form a graphic representation of laboratory performance (Figure 7).
Develop a statement of accuracy for each pollutant and labeled compound
by calculating the average percentage recovery (R) and the standard
deviation of percent recovery (sr). Express the accuracy as a
recovery interval from R-2sr to R+2sr. For
example, if R=95% and sr=5%, the accuracy is 85-105 percent.
12. Qualitative Determination--Accomplished by Comparison of Data from
Analysis of a Sample or Blank with Data from Analysis of the Shift
Standard (Section 11.1). Identification is Confirmed When Spectra and
Retention Times Agree Per the Criteria Below
12.1 Labeled compounds and pollutants having no labeled analog:
12.1.1 The signals for all characteristic masses stored in the
spectral library (Section 7.2.4) shall be present and shall maximize
within the same two consecutive scans.
12.1.2 Either (1) the background corrected EICP areas, or (2) the
corrected relative intensities of the mass spectral peaks at the GC peak
maximum shall agree within a factor of two (0.5 to 2 times) for all
masses stored in the library.
12.1.3 The retention time relative to the nearest eluted internal
standard shall be within 7 scans or 20 seconds, whichever is greater.
12.2 Pollutants having a labeled analog:
12.2.1 The signals for all characteristic masses stored in the
spectral library (Section 7.2.4) shall be present and shall maximize
within the same two consecutive scans.
12.2.2 Either (1) the background corrected EICP areas, or (2) the
corrected relative intensities of the mass spectral peaks at the GC peak
maximum shall agree within a factor of two for all masses stored in the
spectral library.
12.2.3 The retention time difference between the pollutant and its
labeled analog shall agree within 2 scans or
6 seconds (whichever is greater) of this
difference in the shift standard (Section 11.1).
12.3 Masses present in the experimental mass spectrum that are not
present in the reference mass spectrum shall be accounted for by
contaminant or background ions. If the experimental mass spectrum is
contaminated, an experienced spectrometrist (Section 1.4) is to
determine the presence or absence of the compound.
13. Quantitative Determination
13.1 Isotope dilution--by adding a known amount of a labeled
compound to every sample prior to purging, correction for recovery of
the pollutant can be made because the pollutant and its labeled analog
exhibit the same effects upon purging, desorption, and gas
chromatography. Relative response (RR) values for sample mixtures are
used in conjunction with calibration curves described in Section 7.4 to
determine concentrations directly, so long as labeled compound spiking
levels are constant. For the toluene example given in Figure 6 (Section
7.4.3), RR would be equal to 1.174. For this RR value, the toluene
calibration curve given in Figure 5 indicates a concentration of 31.8
[micro]g/L.
[[Page 315]]
13.2 Internal standard--calculate the concentration using the
response factor determined from calibration data (Section 7.5) and the
following equation:
Concentration =(As x Cis)/(Ais x
RF) where the terms are as defined in Section 7.5.1.
13.3 If the EICP area at the quantitation mass for any compound
exceeds the calibration range of the system, the sample is diluted by
successive factors of 10 and these dilutions are analyzed until the area
is within the calibration range.
13.4 Report results for all pollutants and labeled compounds (Table
1) found in all standards, blanks, and samples, in [micro]g/L to three
significant figures. Results for samples which have been diluted are
reported at the least dilute level at which the area at the quantitation
mass is within the calibration range (Section 13.3) and the labeled
compound recovery is within the normal range for the Method (Section
14.2).
14. Analysis of Complex Samples
14.1 Untreated effluents and other samples frequently contain high
levels (1000 [micro]g/L) of the compounds of interest and of
interfering compounds. Some samples will foam excessively when purged;
others will overload the trap/or GC column.
14.2 Dilute 0.5 mL of sample with 4.5 mL of reagent water and
analyze this diluted sample when labeled compound recovery is outside
the range given in Table 5. If the recovery remains outside of the range
for this diluted sample, the aqueous performance standard shall be
analyzed (Section 11) and calibration verified (Section 11.5). If the
recovery for the labeled compmund in the aqueous performance standard is
outside the range given in Table 5, the analytical system is out of
control. In this case, the instrumelt shall be repaired, the performance
specifications in Section 11 shall be met, and the analysis of the
undiluted sample shall be repeated. If the recovery for the aqueous
performance standard is within the range given in Table 5, the method
does not work on the sample being analyzed and the result may not be
reported for regulatory compliance purposes.
14.3 Reverse search computer programs can misinterpret the spectrum
of chromatographically unresolved pollutant and labeled compound pairs
with overlapping spectra when a high level of the pollutant is present.
Examine each chromatogram for peaks greater than the height of the
internal standard peaks. These peaks can obscure the compounds of
interest.
15. Method Performance
15.1 The specifications for this method were taken from the inter-
laboratory validation of EPA Method 624 (reference 9). Method 1624 has
been shown to yield slightly better performance on treated effluents
than Method 624. Additional method performance data can be found in
Reference 10.
References
1. ``Performance Tests for the Evaluation of Computerized Gas
Chromatography/Mass Spectrometry Equipment and Laboratories,'' USEPA,
EMSL/Cincinnati, OH 45268, EPA-600/4-80-025 (April 1980).
2. Bellar, T.A. and Lichtenberg, J.J., ``Journal American Water
Works Association,'' 66, 739 (1974).
3. Bellar, T.A. and Lichtenberg, J.J., ``Semi-automated Headspace
Analysis of Drinking Waters and Industrial Waters for Purgeable Volatile
Organic Compounds,'' in Measurement of Organic Pollutants Water and
Wastewater, C.E. VanHall, ed., American Society for Testing Materials,
Philadelphia, PA, Special Technical Publication 686, (1978).
4. ``Working with Carcinogens,'' DHEW, PHS, NIOSH, Publication 77-
206 (1977).
5. ``OSHA Safety and Health Standards, General Industry,'' 29 CFR
part 1910, OSHA 2206, (1976).
6. ``Safety in Academic Chemistry Laboratories,'' American Chemical
Society Publication, Committee on Chemical Safety (1979).
7. ``Handbook of Analytical Quality Control in Water and Wastewater
Laboratories,'' USEPA, EMSL/Cincinnati, OH 45268, EPA-4-79-019 (March
1979).
8. ``Methods 330.4 and 330.5 for Total Residual Chlorine,'' USEPA,
EMSL/Cincinnati, OH 45268, EPA-4-79-020 (March 1979).
9. ``EPA Method Study 29 EPA Method 624--Purgeables,'' EPA 600/4-84-
054, National Technical Information Service, PB84-209915, Springfield,
Virginia 22161, June 1984.
10. ``Colby, B.N., Beimer, R.G., Rushneck, D.R., and Telliard, W.A.,
``Isotope Dilution Gas Chromatography-Mass Spectrometry for the
Determination of Priority Pollutants in Industrial Effluents,'' USEPA,
Effluent Guidelines Division, Washington, DC 20460 (1980).
Table 1--Volatile Organic Compounds Analyzed by Isotope Dilution Gc/MS
------------------------------------------------------------------------
CAS
Compound Storet registry EPA-EGD NPDES
------------------------------------------------------------------------
Acetone...................... 81552 67-64-1 516 V ........
Acrolein..................... 34210 107-02-8 002 V 001 V
Acrylonitrile................ 34215 107-13-1 003 V 002 V
Benzene...................... 34030 71-43-2 004 V 003 V
Bromodichloromethane......... 32101 75-27-4 048 V 012 V
[[Page 316]]
Bromoform.................... 32104 75-25-2 047 V 005 V
Bromomethane................. 34413 74-83-9 046 V 020 V
Carbon tetrachloride......... 32102 56-23-5 006 V 006 V
Chlorobenzene................ 34301 108-90-7 007 V 007 V
Chloroethane................. 34311 75-00-3 016 V 009 V
2-chloroethylvinyl ether..... 34576 110-75-8 019 V 010 V
Chloroform................... 32106 67-66-1 023 V 011 V
Chloromethane................ 34418 74-87-3 045 V 021 V
Dibromochloromethane......... 32105 124-48-1 051 V 008 V
1,1-dichloroethane........... 34496 75-34-3 013 V 014 V
1,2-dichloroethane........... 34536 107-06-2 010 V 015 V
1,1-dichloroethene........... 34501 75-35-4 029 V 016 V
Trans-1,2-dichloroethane..... 34546 156-60-5 030 V 026 V
1,2-dichloropropane.......... 34541 78-87-5 032 V 017 V
Cis-1,3-dichloropropene...... 34704 10061-01-5 ........ ........
Trans-1,3-dichloropropene.... 34699 10061-02-6 033 V ........
Diethyl ether................ 81576 60-29-7 515 V ........
P-dioxane.................... 81582 123-91-1 527 V ........
Ethylbenzene................. 34371 100-41-4 038 V 019 V
Methylene chloride........... 34423 75-09-2 044 V 022 V
Methyl ethyl ketone.......... 81595 78-93-3 514 V ........
1,1,2,2-tetrachloroethane.... 34516 79-34-5 015 V 023 V
Tetrachlorethene............. 34475 127-18-4 085 V 024 V
Toluene...................... 34010 108-88-3 086 V 025 V
1,1,1-trichloroethane........ 34506 71-55-6 011 V 027 V
1,1,2-trichloroethane........ 34511 79-00-5 014 V 028 V
Trichloroethene.............. 39180 79-01-6 087 V 029 V
Vinyl chloride............... 39175 75-01-4 088 V 031 V
------------------------------------------------------------------------
Table 2--Gas Chromatography of Purgeable Organic Compounds by Isotope
Dilution GC/MS
------------------------------------------------------------------------
Mean Minimum
EGD Ref retention level (2)
No. Compound EGD time ([micro]g/
(1) No. (sec) L)
------------------------------------------------------------------------
181 Bromochloromethane (I.S.).............. 181 730 10
245 Chloromethane-d3....................... 181 147 50
345 Chloromethane.......................... 245 148 50
246 Bromomethane-d3........................ 181 243 50
346 Bromomethane........................... 246 246 50
288 Vinyl chloride-d3...................... 181 301 50
388 Vinyl chloride......................... 288 304 10
216 Chloroethane-d5........................ 181 378 50
316 Chloroethane........................... 216 386 50
244 Methylene chloride-d2.................. 181 512 10
344 Methylene chloride..................... 244 517 10
616 Acetone-d6............................. 181 554 50
716 Acetone................................ 616 565 50
002 Acrolein............................... 181 566 50
203 Acrylonitrile-d3....................... 181 606 50
303 Acrylonitrile.......................... 203 612 50
229 1,1-dichloroethene-d2.................. 181 696 10
329 1,1-dichloroethene..................... 229 696 10
213 1,1-dichloroethane-d3.................. 181 778 10
313 1,1-dichloroethane..................... 213 786 10
615 Diethyl ether-d10...................... 181 804 50
715 Diethyl ether.......................... 615 820 50
230 Trans-1,2-dichloroethene-d2............ 181 821 10
330 Trans-1,2-dichloroethene............... 230 821 10
614 Methyl ethyl ketone-d3................. 181 840 50
714 Methyl ethyl ketone.................... 614 848 50
223 Chloroform-13C1........................ 181 861 10
323 Chloroform............................. 223 861 10
210 1,2-dichloroethane-d4.................. 181 901 10
310 1,2-dichloroethane..................... 210 910 10
211 1,1,1-trichloroethane-13C2............. 181 989 10
311 1,1,1-trichloroethane.................. 211 999 10
527 p-dioxane.............................. 181 1001 10
206 Carbon tetrachloride-13C1.............. 182 1018 10
306 Carbon tetrachloride................... 206 1018 10
248 Bromodichloromethane-13C1.............. 182 1045 10
348 Bromodichloromethane................... 248 1045 10
232 1,2-dichloropropane-d6................. 182 1123 10
332 1.2-dichloropropane.................... 232 1134 10
233 Trans-1,3-dichloropropene-d4........... 182 1138 10
333 Trans-1,3-dichloropropene.............. 233 1138 10
287 Trichloroethene-13C1................... 182 1172 10
387 Trichloroethene........................ 287 1187 10
204 Benzene-d6............................. 182 1200 10
304 Benzene................................ 204 1212 10
251 Chlorodibromemethane-13C1.............. 182 1222 10
351 Chlorodibromomethane................... 251 1222 10
214 1,1,2-trichloroethane-13C2............. 182 1224 10
314 1,1,2-trichloroethane.................. 214 1224 10
019 2-chloroethylvinyl ether............... 182 1278 10
182 2-bromo-1-chloropropane (I.S.)......... 182 1306 10
247 Bromoform-13C1......................... 182 1386 10
347 Bromoform.............................. 247 1386 10
215 1,1,2,2-tetrachloroethane-d2........... 183 1525 10
315 1,1,2,2-tetrachloroethane.............. 215 1525 10
285 Tetrachloroethene-13C2................. 183 1528 10
385 Tetrachloroethene...................... 285 1528 10
183 1,4-dichlorobutale (int std)........... 183 1555 10
286 Toluene-d8............................. 183 1603 10
386 Toluene................................ 286 1619 10
[[Page 317]]
207 Chlorobenzene-d5....................... 183 1679 10
307 Chlorobenzene.......................... 207 1679 10
238 Ethylbenzene-d10....................... 183 1802 10
338 Ethylbenzene........................... 238 1820 10
185 Bromofluorobenzene..................... 183 1985 10
------------------------------------------------------------------------
(1) Reference numbers beginning with 0, 1 or 5 indicate a pollutant
quantified by the internal standard method; reference numbers
beginning with 2 or 6 indicate a labeled compound quantified by the
internal standard method; reference numbers beginning with 3 or 7
indicate a pollutant quantified by isotope dilution.
(2) This is a minimum level at which the analytical system shall give
recognizable mass spectra (background corrected) and acceptable
calibration points. Column: 2.4m (8 ft) x 2 mm i.d. glass, packed with
one percent SP-1000 coated on 60/80 Carbopak B. Carrier gas: helium at
40 mL/min. Temperature program: 3 min at 45 [deg]C, 8 [deg]C per min
to 240 [deg]C, hold at 240 [deg]C for 15 minutes.
Note: The specifications in this table were developed from data
collected from three wastewater laboratories.
Table 3--BFB Mass-Intensity Specifications
------------------------------------------------------------------------
Mass Intensity required
------------------------------------------------------------------------
50 15 to 40 percent of mass 95.
75 30 to 60 percent of mass 95.
95 base peak, 100 percent.
96 5 to 9 percent of mass 95.
173 <2 percent of mass 174.
174 50 percent of mass 95.
175 5 to 9 percent of mass 174
176 95 to 101 percent of mass 174
177 5 to 9 percent of mass 176.
------------------------------------------------------------------------
Table 4--Volatile Organic Compound Characteristic Masses
------------------------------------------------------------------------
Primary m/
Labeled compound Analog z's
------------------------------------------------------------------------
Acetone............................................ d6 58/64
Acrolein........................................... d2 56/58
Acrylonitrile...................................... d3 53/56
Benzene............................................ d6 78/84
Bromodichloromethane............................... 13C 83/86
Bromoform.......................................... 13C 173/176
Bromomethale....................................... d3 96/99
Carbon tetrachloride............................... 13C 47/48
Chlorobenzene...................................... d5 112/117
Chloroethane....................................... d5 64/71
2-chloroethylvinyl ether........................... d7 106/113
Chloroform......................................... 13C 85/86
Chloromethane...................................... d3 50/53
Dibromochloromethane............................... 13C 129/130
1,1-dichloroethane................................. d3 63/66
1,2-dichloroethane................................. d4 62/67
1,1-dichloroethene................................. d2 61/65
Trans-1,2-dichloroethene........................... d2 61/65
1,2-dichloropropane................................ d6 63/67
Cis-1,3-dichloropropene............................ d4 75/79
Trans-1,3-dichloropropene.......................... d4 75/79
Diethyl ether...................................... d10 74/84
p-dioxane.......................................... d8 88/96
Ethylbenzene....................................... d10 106/116
Methylene chloride................................. d2 84/88
Methyl ethyl ketone................................ d3 72/75
1,1,2,2-tetrachloroethane.......................... d2 83/84
Tetrachloroethene.................................. 13C2 166/172
Toluene............................................ d8 92/99
1,1,1-trichloroethane.............................. d3 97/102
1,1,2-trichloroethane.............................. 13C2 83/84
Trichloroethene.................................... 13C 95/133
Vinyl chloride..................................... d3 62/65
------------------------------------------------------------------------
Table 5--Acceptance Criteria for Performance Tests
----------------------------------------------------------------------------------------------------------------
Acceptance criteria at 20 [micro]g/L
------------------------------------------------------
Initial precision and Labeled On-going
accuracy section 8.2.3 compound accuracy
Compound ----------------------------- recovery sec. 11.5
sec. 8.3 ------------
s ([micro]g/ X ([micro]g/L) and 14.2
L) ------------- R ([micro]g/
P (percent) L)
----------------------------------------------------------------------------------------------------------------
Acetone.................................................. Note 1
Acrolein................................................. Note 2
Acrylonitrile............................................ Note 2
Benzene.................................................. 9.0 13.0-28.2 ns-196 4-33
Bromodichloromethane..................................... 8.2 6.5-31.5 ns-199 4-34
Bromoform................................................ 7.0 7.4-35.1 ns-214 6-36
Bromomethane............................................. 25.0 d-54.3 ns-414 d-61
Carbon tetrachloride..................................... 6.9 15.9-24.8 42-165 12-30
Chlorobenzene............................................ 8.2 14.2-29.6 ns-205 4-35
Chloroethane............................................. 14.8 2.1-46.7 ns-308 d-51
2-chloroethylvinyl ether................................. 36.0 d-69.8 ns-554 d-79
Chloroform............................................... 7.9 11.6-26.3 18-172 8-30
Chloromethane............................................ 26.0 d-55.5 ns-410 d-64
Dibromochloromethane..................................... 7.9 11.2-29.1 16-185 8-32
1,1-dichloroethane....................................... 6.7 11.4-31.4 23-191 9-33
1,2-dichloroethane....................................... 7.7 11.6-30.1 12-192 8-33
1,1-dichloroethene....................................... 11.7 d-49.8 ns-315 d-52
Trans-1,2-dichloroethene................................. 7.4 10.5-31.5 15-195 8-34
[[Page 318]]
1,2-dichloropropane...................................... 19.2 d-46.8 ns-343 d-51
Cis-1,3-dichloropropene.................................. 22.1 d-51.0 ns-381 d-56
Trans-1,3-dichloropropene................................ 14.5 d-40.2 ns-284 d-44
Diethyl ether............................................ Note 1
P-dioxane................................................ Note 1
Ethyl benzene............................................ 9.6 15.6-28.5 ns-203 5-35
Methylene chloride....................................... 9.7 d-49.8 ns-316 d-50
Methyl ethyl ketone...................................... Note 1
1,1,2,2-tetrachloroethane................................ 9.6 10.7-30.0 5-199 7-34
Tetrachloroethene........................................ 6.6 15.1-28.5 31-181 11-32
Toluene.................................................. 6.3 14.5-28.7 4-193 6-33
1,1,1-trichloroethane.................................... 5.9 10.5-33.4 12-200 8-35
1,1,2-trichloroethane.................................... 7.1 11.8-29.7 21-184 9-32
Trichloroethene.......................................... 8.9 16.6-29.5 35-196 12-34
Vinyl chloride........................................... 27.9 d-58.5 ns-452 d-65
----------------------------------------------------------------------------------------------------------------
d = detected; result must be greater than zero.
ns = no specification; limit would be below detection limit.
Note 1: Specifications not available for these compounds at time of release of this method.
Note 2: Specifications not developed for these compounds; use method 603.
[[Page 319]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.055
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[GRAPHIC] [TIFF OMITTED] TC02JY92.056
Method 1625 Revision B--Semivolatile Organic Compounds by Isotope
Dilution GC/MS
1. Scope and Application
1.1 This method is designed to determine the semivolatile toxic
organic pollutants associated with the 1976 Consent Decree and
additional compounds amenable to extraction and analysis by capillary
column gas chromatography-mass spectrometry (GC/MS).
1.2 The chemical compounds listed in Tables 1 and 2 may be
determined in municipal and industrial discharges by this method. The
method is designed to meet the survey
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requirements of Effluent Guidelines Division (EGD) and the National
Pollutants Discharge Elimination System (NPDES) under 40 CFR 136.1. Any
modifications of this method, beyond those expressly permitted, shall be
considered as major modifications subject to application and approval of
alternate test procedures under 40 CFR 136.4 and 136.5.
1.3 The detection limit of this method is usually dependent on the
level of interferences rather than instrumental limitations. The limits
listed in Tables 3 and 4 represent the minimum quantity that can be
detected with no interferences present.
1.4 The GC/MS portions of this method are for use only by analysts
experienced with GC/MS or under the close supervision of such qualified
persons. Laboratories unfamiliar with analyses of environmental samples
by GC/MS should run the performance tests in reference 1 before
beginning.
2. Summary of Method
2.1 Stable isotopically labeled analogs of the compounds of interest
are added to a one liter wastewater sample. The sample is extracted at
pH 12-13, then at pH <2 with methylene chloride using continuous
extraction techniques. The extract is dried over sodium sulfate and
concentrated to a volume of one mL. An internal standard is added to the
extract, and the extract is injected into the gas chromatograph (GC).
The compounds are separated by GC and detected by a mass spectrometer
(MS). The labeled compounds serve to correct the variability of the
analytical technique.
2.2 Identification of a compound (qualitative analysis) is performed
by comparing the GC retention time and background corrected
characteristic spectral masses with those of authentic standards.
2.3 Quantitative analysis is performed by GC/MS using extracted ion
current profile (EICP) areas. Isotope dilution is used when labeled
compounds are available; otherwise, an internal standard method is used.
2.4 Quality is assured through reproducible calibration and testing
of the extraction and GC/MS systems.
3. Contamination and Interferences
3.1 Solvents, reagents, glassware, and other sample processing
hardware may yield artifacts and/or elevated baselines causing
misinterpretation of chromatograms and spectra. All materials shall be
demonstrated to be free from interferences under the conditions of
analysis by running method blanks initially and with each sample lot
(samples started through the extraction process on a given 8 hr shift,
to a maximum of 20). Specific selection of reagents and purification of
solvents by distillation in all-glass systems may be required. Glassware
and, where possible, reagents are cleaned by solvent rinse and baking at
450 [deg]C for one hour minimum.
3.2 Interferences coextracted from samples will vary considerably
from source to source, depending on the diversity of the industrial
complex or municipality being samples.
4. Safety
4.1 The toxicity or carcinogenicity of each compound or reagent used
in this method has not been precisely determined; however, each chemical
compound should be treated as a potential health hazard. Exposure to
these compounds should be reduced to the lowest possible level. The
laboratory is responsible for maintaining a current awareness file of
OSHA regulations regarding the safe handling of the chemicals specified
in this method. A reference file of data handling sheets should also be
made available to all personnel involved in these analyses. Additional
information on laboratory safety can be found in references 2-4.
4.2 The following compounds covered by this method have been
tentatively classified as known or suspected human or mammalian
carcinogens: benzidine benzo(a)anthracene, 3,3'-dichlorobenzidine,
benzo(a)pyrene, dibenzo(a,h)anthracene, N-nitrosodimethylamine, and
[beta]-naphtylamine. Primary standards of these compounds shall be
prepared in a hood, and a NIOSH/MESA approved toxic gas respirator
should be worn when high concentrations are handled.
5. Apparatus and Materials
5.1 Sampling equipment for discrete or composite sampling.
5.1.1 Sample bottle, amber glass, 1.1 liters minimum. If amber
bottles are not available, samples shall be protected from light.
Bottles are detergent water washed, then solvent rinsed or baked at 450
[deg]C for one hour minimum before use.
5.1.2 Bottle caps--threaded to fit sample bottles. Caps are lined
with Teflon. Aluminum foil may be substituted if the sample is not
corrosive. Liners are detergent water washed, then reagent water
(Section 6.5) and solvent rinsed, and baked at approximately 200 [deg]C
for one hour minimum before use.
5.1.3 Compositing equipment--automatic or manual compositing system
incorporating glass containers for collection of a minimum 1.1 liters.
Sample containers are kept at 0 to 4 [deg]C during sampling. Glass or
Teflon tubing only shall be used. If the sampler uses a peristaltic
pump, a minimum length of compressible silicone rubber tubing may be
used in the pump only. Before use, the tubing is thoroughly rinsed with
methanol, followed by repeated rinsings with reagent water (Section 6.5)
to minimize sample contamination. An integrating flow meter is used to
collect proportional composite samples.
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5.2 Continuous liquid-liquid extractor--Teflon or glass conncecting
joints and stopcocks without lubrication (Hershberg-Wolf Extractor) one
liter capacity, Ace Glass 6841-10, or equivalent.
5.3 Drying column--15 to 20 mm i.d. Pyrex chromatographic column
equipped with coarse glass frit or glass wool plug.
5.4 Kuderna-Danish (K-D) apparatus
5.4.1 Concentrator tube--10mL, graduated (Kontes K-570050-1025, or
equivalent) with calibration verified. Ground glass stopper (size 19/22
joint) is used to prevent evaporation of extracts.
5.4.2 Evaporation flask--500 mL (Kontes K-570001-0500, or
equivalent), attached to concentrator tube with springs (Kontes K-
662750-0012).
5.4.3 Snyder column--three ball macro (Kontes K-503000-0232, or
equivalent).
5.4.4 Snyder column--two ball micro (Kontes K-469002-0219, or
equivalent).
5.4.5 Boiling chips--approx 10/40 mesh, extracted with methylene
chloride and baked at 450 [deg]C for one hr minimum.
5.5 Water bath--heated, with concentric ring cover, capable of
temperature control 2 [deg]C, installed in a fume
hood.
5.6 Sample vials--amber glass, 2-5 mL with Teflon-lined screw cap.
5.7 Analytical balance--capable of weighing 0.1 mg.
5.8 Gas chromatograph--shall have splitless or on-column injection
port for capillary column, temperature program with 30 [deg]C hold, and
shall meet all of the performance specifications in Section 12.
5.8.1 Column--30 5 mx0.25 0.02 mm i.d. 5% phenyl, 94% methyl, 1% vinyl silicone
bonded phase fused silica capillary column (J & W DB-5, or equivalent).
5.9 Mass spectrometer--70 eV electron impact ionization, shall
repetitively scan from 35 to 450 amu in 0.95 to 1.00 second, and shall
produce a unit resolution (valleys between m/z 441-442 less than 10
percent of the height of the 441 peak), backgound corrected mass
spectrum from 50 ng decafluorotriphenylphosphine (DFTPP) introduced
through the GC inlet. The spectrum shall meet the mass-intensity
criteria in Table 5 (reference 5). The mass spectrometer shall be
interfaced to the GC such that the end of the capillary column
terminates within one centimeter of the ion source but does not
intercept the electron or ion beams. All portions of the column which
connect the GC to the ion source shall remain at or above the column
temperature during analysis to preclude condensation of less volatile
compounds.
5.10 Data system--shall collect and record MS data, store mass-
intensity data in spectral libraries, process GC/MS data, generate
reports, and shall compute and record response factors.
5.10.1 Data acquisition--mass spectra shall be collected
continuously throughout the analysis and stored on a mass storage
device.
5.10.2 Mass spectral libraries--user created libraries containing
mass spectra obtained from analysis of authentic standards shall be
employed to reverse search GC/MS runs for the compounds of interest
(Section 7.2).
5.10.3 Data processing--the data system shall be used to search,
locate, identify, and quantify the compounds of interest in each GC/MS
analysis. Software routines shall be employed to compute retention times
and peak areas. Displays of spectra, mass chromatograms, and library
comparisons are required to verify results.
5.10.4 Response factors and multipoint calibrations--the data system
shall be used to record and maintain lists of response factors (response
ratios for isotope dilution) and multipoint calibration curves (Section
7). Computations of relative standard deviation (coefficient of
variation) are useful for testing calibration linearity. Statistics on
initial (Section 8.2) and on-going (Section 12.7) performance shall be
computed and maintained.
6. Reagents and Standards
6.1 Sodium hydroxide--reagent grade, 6N in reagent water.
6.2 Sulfuric acid--reagent grade, 6N in reagent water.
6.3 Sodium sulfate--reagent grade, granular anhydrous, rinsed with
methylene chloride (20 mL/g) and conditioned at 450 [deg]C for one hour
minimum.
6.4 Methylene chloride--distilled in glass (Burdick and Jackson, or
equivalent).
6.5 Reagent water--water in which the compounds of interest and
interfering compounds are not detected by this method.
6.6 Standard solutions--purchased as solutions or mixtures with
certification to their purity, concentration, and authenticity, or
prepared from materials of known purity and composition. If compound
purity is 96 percent or greater, the weight may be used without
correction to compute the concentration of the standard. When not being
used, standards are stored in the dark at -20 to -10 [deg]C in screw-
capped vials with Teflon-lined lids. A mark is placed on the vial at the
level of the solution so that solvent evaporation loss can be detected.
The vials are brought to room temperature prior to use. Any precipitate
is redissolved and solvent is added if solvent loss has occurred.
6.7 Preparation of stock solutions--prepare in methylene chloride,
benzene, p-dioxane, or a mixture of these solvents per the steps below.
Observe the safety precautions in Section 4. The large number of labeled
and unlabeled acid, base/neutral, and Appendix C compounds used for
combined
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calibration (Section 7) and calibration verification (12.5) require high
concentratimns (approx 40 mg/mL) when individual stock solutions are
prepared, so that dilutions of mixtures will permit calibration with all
compounds in a single set of solutions. The working range for most
compounds is 10-200 [micro]g/mL. Compounds with a reduced MS response
may be prepared at higher concentrations.
6.7.1 Dissolve an appropriate amount of assayed reference material
in a suitable solvent. For example, weigh 400 mg naphthalene in a 10 mL
ground glass stoppered volumetric flask and fill to the mark with
benzene. After the naphthalene is completely dissolved, transfer the
solution to a 15 mL vial with Teflon-lined cap.
6.7.2 Stock standard solutions should be checked for signs of
degradation prior to the preparation of calibration or performance test
standards. Quality control check samples that can be used to determine
the accuracy of calibration standards are available from the US
Environmental Protection Agency, Environmental Monitoring and Support
Laboratory, Cincinnati, Ohio 45268.
6.7.3 Stock standard solutions shall be replaced after six months,
or sooner if comparison with quality control check samples indicates a
change in concentration.
6.8 Labeled compound spiking solution--from stock standard solutions
prepared as above, or from mixtures, prepare the spiking solution at a
concentration of 200 [micro]g/mL, or at a concentration appropriate to
the MS response of each compound.
6.9 Secondary standard--using stock solutions (Section 6.7), prepare
a secondary standard containing all of the compounds in Tables 1 and 2
at a concentration of 400 [micro]g/mL, or higher concentration
appropriate to the MS response of the compound.
6.10 Internal standard solution--prepare 2,2'-difluorobiphenyl (DFB)
at a concentration of 10 mg/mL in benzene.
6.11 DFTPP solution--prepare at 50 [micro]g/mL in acetone.
6.12 Solutions for obtaining authentic mass spectra (Section 7.2)--
prepare mixtures of compounds at concentrations which will assure
authentic spectra are obtained for storage in libraries.
6.13 Calibration solutions--combine 0.5 mL of the solution in
Section 6.8 with 25, 50, 125, 250, and 500 uL of the solution in section
6.9 and bring to 1.00 mL total volume each. This will produce
calibration solutions of nominal 10, 20, 50, 100, and 200 [micro]g/mL of
the pollutants and a constant nominal 100 [micro]g/mL of the labeled
compounds. Spike each solution with 10 [micro]L of the internal standard
solution (Section 6.10). These solutions permit the relative response
(labeled to unlabeled) to be measured as a function of concentration
(Section 7.4).
6.14 Precision and recovery standard--used for determination of
initial (Section 8.2) and on-going (Section 12.7) precision and
recovery. This solution shall contain the pollutants and labeled
compounds at a nominal concentration of 100 [micro]g/mL.
6.15 Stability of solutions--all standard solutions (Sections 6.8-
6.14) shall be analyzed within 48 hours of preparation and on a monthly
basis thereafter for signs of degradation. Standards will remain
acceptable if the peak area at the quantitation mass relative to the DFB
internal standard remains within 15 percent of the
area obtained in the initial analysis of the standard.
7. Calibration
7.1 Assemble the GC/MS and establish the operating conditions in
Table 3. Analyze standards per the procedure in Section 11 to
demonstrate that the analytical system meets the detection limits in
Tables 3 and 4, and the mass-intensity criteria in Table 5 for 50 ng
DFTPP.
7.2 Mass spectral libraries--detection and identification of
compounds of interest are dependent upon spectra stored in user created
libraries.
7.2.1 Obtain a mass spectrum of each pollutant, labeled compound,
and the internal standard by analyzing an authentic standard either
singly or as part of a mixture in which there is no interference between
closely eluted components. That only a single compound is present is
determined by examination of the spectrum. Fragments not attributable to
the compound under study indicate the presence of an interfering
compound.
7.2.2 Adjust the analytical conditions and scan rate (for this test
only) to produce an undistorted spectrum at the GC peak maximum. An
undistorted spectrum will usually be obtained if five complete spectra
are collected across the upper half of the GC peak. Software algorithms
designed to ``enhance'' the spectrum may eliminate distortion, but may
also eliminate authentic masses or introduce other distortion.
7.2.3 The authentic reference spectrum is obtained under DFTPP
tuning conditions (Section 7.1 and Table 5) to normalize it to spectra
from other instruments.
7.2.4 The spectrum is edited by saving the 5 most intense mass
spectral peaks and all other mass spectral peaks greater than 10 percent
of the base peak. This edited spectrum is stored for reverse search and
for compound confirmation.
7.3 Analytical range--demonstrate that 20 ng anthracene or
phenanthrene produces an area at m/z 178 approx one-tenth that required
to exceed the linear range of the system. The exact value must be
determined by experience for each instrument. It is used to match the
calibration range of the instrument to the analytical range and
detection limits required, and to diagnose instrument
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sensitivity problems (Section 15.4). The 20 ug/mL calibration standard
(Section 6.13) can be used to demonstrate this performance.
7.3.1 Polar compound detection--demonstrate that unlabeled
pentachlorophenol and benzidine are detectable at the 50 [micro]g/mL
level (per all criteria in Section 13). The 50 [micro]g/mL calibration
standard (Section 6.13) can be used to demonstrate this performance.
7.4 Calibration with isotope dilution--isotope dilution is used when
(1) labeled compounds are available, (2) interferences do not preclude
its use, and (3) the quantitation mass extracted ion current profile
(EICP) area for the compound is in the calibration range. If any of
these conditions preclude isotope dilution, internal standard methods
(Section 7.5 or 7.6) are used.
7.4.1 A calibration curve encompassing the concentration range is
prepared for each compound to be determined. The relative response
(pollutant to labeled) vs concentration in standard solutions is plotted
or computed using a linear regression. The example in Figure 1 shows a
calibration curve for phenol using phenol-d5 as the isotopic diluent.
Also shown are the 10 percent error limits (dotted
lines). Relative Reponse (RR) is determined according to the procedures
described below. A minimum of five data points are employed for
calibration.
7.4.2 The relative response of a pollutant to its labeled analog is
determined from isotope ratio values computed from acquired data. Three
isotope ratios are used in this process:
RX = the isotope ratio measured for the pure pollutant.
Ry = the isotope ratio measured for the labeled compound.
Rm = the isotope ratio of an analytical mixture of
pollutant and labeled compounds.
The m/z's are selected such that RX
Ry. If Rm is not between 2Ry and
0.5RX, the method does not apply and the sample is analyzed
by internal or external standard methods.
7.4.3 Capillary columns usually separate the pollutant-labeled pair,
with the labeled compound eluted first (Figure 2). For this case,
RX = [area m1/z]/1, at the retention time of the
pollutant (RT2). Ry = 1/[area m2/z, at
the retention time of the labeled compound RT1).
Rm = [area at m1/z (at RT2)]/[area at
RT1)], as measured in the mixture of the pollutant and
labeled compounds (Figure 2), and RR = Rm.
7.4.4 Special precautions are taken when the pollutant-labeled pair
is not separated, or when another labeled compound with interfering
spectral masses overlaps the pollutant (a case which can occur with
isomeric compounds). In this case, it is necessary to determine the
respective contributions of the pollutant and labeled compounds to the
respective EICP areas. If the peaks are separated well enough to permit
the data system or operator to remove the contributions of the compounds
to each other, the equations in Section 7.4.3 apply. This usually occurs
when the height of the valley between the two GC peaks at the same m/z
is less than 10 percent of the height of the shorter of the two peaks.
If significant GC and spectral overlap occur, RR is computed using the
following equation:
RR = (Ry - Rm) (RX + 1)/
(Rm - RX) (Ry + 1), where RX
is measured as shown in Figure 3A, Ry is measured as shown in
Figure 3B, and Rm is measured as shown in Figure 3C. For
example, RX = 46100/4780 = 9.644, Ry = 2650/43600
= 0.0608, Rm = 49200/48300 = 1.019. amd RR = 1.114.
7.4.5 To calibrate the analytical system by isotope dilution,
analyze a 1.0 [micro]L aliquot of each of the calibration standards
(Section 6.13) using the procedure in Section 11. Compute the RR at each
concentration.
7.4.6 Linearity--if the ratio of relative response to concentration
for any compound is constant (less than 20 percent coefficient of
variation) over the 5 point calibration range, and averaged relative
response/concentration ratio may be used for that compound; otherwise,
the complete calibration curve for that compound shall be used over the
5 point calibration range.
7.5 Calibration by internal standard--used when criteria for istope
dilution (Section 7.4) cannot be met. The internal standard to be used
for both acid and base/neutral analyses is 2,2'-difluorobiphenyl. The
internal standard method is also applied to determination of compounds
having no labeled analog, and to measurement of labeled compounds for
intra-laboratory statistics (Sections 8.4 and 12.7.4).
7.5.1 Response factors--calibration requires the determination of
response factors (RF) which are defined by the following equation:
RF = (As x Cis)/(Ais x
Cs), where
As is the area of the characteristic mass for the
compmund in the daily standard
Ais is the area of the characteristic mass for the
internal standard
Cis is the concentration of the internal standard
([micro]g/mL)
Cs is the concentration of the compound in the daily
standard ([micro]g/mL)
7.5.1.1 The response factor is determined for at least five
concentrations appropriate to the response of each compound (Section
6.13); nominally, 10, 20, 50, 100, and 200 [micro]g/mL. The amount of
internal standard added to each extract is the same (100 [micro]g/mL) so
that Cis remains constant. The RF is plotted vs concentration
for each compound in the standard (Cs) to produce a
calibration curve.
7.5.1.2 Linearity--if the response factor (RF) for any compound is
constant (less than 35 percent coefficient of variation) over the 5
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point calibration range, an averaged response factor may be used for
that compound; otherwise, the complete calibration curve for that
compound shall be used over the 5 point range.
7.6 Combined calibration--by using calibration solutions (Section
6.13) containing the pollutants, labeled compounds, and the internal
standard, a single set of analyses can be used to produce calibration
curves for the isotope dilution and internal standard methods. These
curves are verified each shift (Section 12.5) by analyzing the 100
[micro]g/mL calibration standard (Section 6.13). Recalibration is
required only if calibration verification (Section 12.5) criteria cannot
be met.
8. Quality Assurance/Quality Control
8.1 Each laboratory that uses this method is required to operate a
formal quality assurance program. The minimum requirements of this
program consist of an initial demonstration of laboratory capability,
analysis of samples spiked with labeled compounds to evaluate and
document data quality, and analysis of standards and blanks as tests of
continued performance. Laboratory performance is compared to established
performance criteria to determine if the results of analyses meet the
performance characteristics of the method.
8.1.1 The analyst shall make an initial demonstration of the ability
to generate acceptable accuracy and precision with this method. This
ability is established as described in Section 8.2.
8.1.2 The analyst is permitted to modify this method to improve
separations or lower the costs of measurements, provided all performance
specifications are met. Each time a modification is made to the method,
the analyst is required to repeat the procedure in Section 8.2 to
demonstrate method performance.
8.1.3 Analyses of blanks are required to demonstrate freedom from
contamination. The procedures and criteria for analysis of a blank are
described in Section 8.5.
8.1.4 The laboratory shall spike all samples with labeled compounds
to monitor method performance. This test is described in Section 8.3.
When results of these spikes indicate atypical method performance for
samples, the samples are diluted to bring method performance within
acceptable limits (Section 15).
8.1.5 The laboratory shall, on an on-going basis, demonstrate
through calibration verification and the analysis of the precision and
recovery standard (Section 6.14) that the analysis system is in control.
These procedures are described in Sections 12.1, 12.5, and 12.7.
8.1.6 The laboratory shall maintain records to define the quality of
data that is generated. Development of accuracy statements is described
in Section 8.4.
8.2 Initial precision and accuracy--to establish the ability to
generate acceptable precision and accuracy, the analyst shall perform
the following operations:
8.2.1 Extract, concentrate, and analyze two sets of four one-liter
aliquots (8 aliquots total) of the precision and recovery standard
(Section 6.14) according to the procedure in Section 10.
8.2.2 Using results of the first set of four analyses, compute the
average recovery (X) in [micro]g/mL and the standard deviation of the
recovery (s) in [thetas]g/[micro]L for each compound, by isotope
dilution for pollutants with a labeled analog, and by internal standard
for labeled compounds and pollutants with no labeled analog.
8.2.3 For each compound, compare s and X with the corresponding
limits for initial precision and accuracy in Table 8. If s and X for all
compounds meet the acceptance criteria, system performance is acceptable
and analysis of blanks and samples may begin. If, however, any
individual s exceeds the precision limit or any individual X falls
outside the range for accuracy, system performance is unacceptable for
that compound.
Note: The large number of compounds in Table 8 present a substantial
probability that one or more will fail the acceptance criteria when all
compounds are analyzed. To determine if the analytical system is out of
control, or if the failure can be attributed to probability, proceed as
follows:
8.2.4 Using the results of the second set of four analyses, compute
s and X for only those compounds which failed the test of the first set
of four analyses (Section 8.2.3). If these compounds now pass, system
performance is acceptable for all compounds and analysis of blanks and
samples may begin. If, however, any of the same compoulds fail again,
the analysis system is not performing properly for these compounds. In
this event, correct the problem and repeat the entire test (Section
8.2.1).
8.3 The laboratory shall spike all samples with labeled compounds to
assess method performance on the sample matrix.
8.3.1 Analyze each sample according to the method in Section 10.
8.3.2 Compute the percent recovery (P) of the labeled compounds
using the internal standard methmd (Section 7.5).
8.3.3 Compare the labeled compound recovery for each compound with
the corresponding limits in Table 8. If the recovery of any compounds
falls outside its warning limit, method performance is unacceptable for
that compound in that sample, Therefore, the sample is complex and is to
be diluted and reanalyzed per Section 15.4.
8.4 As part of the QA program for the laboratory, method accuracy
for wastewater samples shall be assessed and records shall
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be maintained. After the analysis of five wastewater samples for which
the labeled compounds pass the tests in Section 8.3, compute the average
percent recovery (P) and the standard deviation of the percent recovery
(sp) for the labeled compounds only. Express the accuracy
assessment as a percent recovery interval from P--2 sp to
P+2sp. For example, if P=90% and sp=10%, the
accuracy interval is expressed as 70-100%. Update the accuracy
assessment for each compound on a regular basis (e.g. after each 5-10
new accuracy measurements).
8.5 Blanks--reagent water blanks are analyzed to demonstrate freedom
from contamination.
8.5.1 Extract and concentrate a blank with each sample lot (samples
started through the extraction process on the same 8 hr shift, to a
maximum of 20 samples). Analyze the blank immediately after analysis of
the precision and recovery standard (Section 6.14) to demonstrate
freedom from contamination.
8.5.2 If any of the compounds of interest (Tables 1 and 2) or any
potentially interfering compound is found in a blank at greater than 10
[micro]g/L (assuming a response factor of 1 relative to the internal
standard for compounds not listed in Tables 1 and 2), analysis of
samples is halted until the source of contamination is eliminated and a
blank shows no evidence of contamination at this level.
8.6 The specifications contained in this method can be met if the
apparatus used is calibrated properly, then maintained in a calibrated
state. The standards used for calibration (Section 7), calibration
verification (Section 12.5), and for initial (Section 8.2) and on-going
(Section 12.7) precision and recovery should be identical, so that the
most precise results will be obtained. The GC/MS instrument in
particular will provide the most reproducible results if dedicated to
the settings and conditions required for the analysis of semi-volatiles
by this method.
8.7 Depending on specific program requirements, field replicates may
be collected to determine the precision of the sampling technique, and
spiked samples may be required to determine the accuracy of the analysis
when internal or external standard methods are used.
9. Sample Collection, Preservation, and Handling
9.1 Collect samples in glass containers following conventional
sampling practices (Reference 7). Composite samples are collected in
refrigerated glass containers (Section 5.1.3) in accordance with the
requirements of the sampling program.
9.2 Maintain samples at 0-4 [deg]C from the time collectimn until
extraction. If residual chlorine is present, add 80 mg sodium
thiosulfate per liter of water. EPA Methods 330.4 and 330.5 may be used
to measure residual chlorine (Reference 8).
9.3 Begin sample extraction within seven days of collection, and
analyze all extracts within 40 days of extraction.
10. Sample Extraction and Concentration (See Figure 4)
10.1 Labeled compound spiking--measure 1.00 0.01 liter of sample into a glass container. For
untreated effluents, and samples which are expected to be difficult to
extract and/or concentrate, measure an additional 10.0 0.1 mL and dilute to a final volume of 1.00 0.01 liter with reagent water in a glass container.
10.1.1 For each sample or sample lot (to a maximum of 20) to be
extracted at the same time, place three 1.00 0.10
liter aliquots of reagent water in glass containers.
10.1.2 Spike 0.5 mL of the labeled compound spiking solution
(Section 6.8) into all samples and one reagant water aliquot.
10.1.3 Spike 1.0 mL of the precision and recovery standard (Section
6.14) into the two remaining reagent water aliquots.
10.1.4 Stir and equilibrate all solutions for 1-2 hr.
10.2 Base/neutral extraction--place 100-150 mL methylene chloride in
each continuous extractor and 200-300 in each distilling flask.
10.2.1 Pour the sample(s), blank, and standard aliquots into the
extractors. Rinse the glass containers with 50-100 mL methylene chloride
and add to the respective extractor.
10.2.2 Adjust the pH of the waters in the extractors to 12-13 with
6N NaOH while monitoring with a pH meter. Begin the extraction by
heating the flask until the methylene chloride is boiling. When properly
adjusted, 1-2 drops of methylene chloride per second will fall from the
condensor tip into the water. After 1-2 hours of extraction, test the pH
and readjust to 12-13 if required. Extract for 18-24 hours.
10.2.3 Remove the distilling flask, estimate and record the volume
of extract (to the nearest 100 mL), and pour the contents through a
drying column containing 7 to 10 cm anhydrous sodium sulfate. Rinse the
distilling flask with 30-50 mL of methylene chloride and pour through
the drying column. Collect the solution in a 500 mL K-D evaporator flask
equipped with a 10 mL concentrator tube. Seal, label as the base/neutral
fraction, and concentrate per Sections 10.4 to 10.5.
10.3 Acid extraction--adjust the pH of the waters in the extractors
to 2 or less using 6N sulfuric acid. Charge clean distilling flasks with
300-400 mL of methylene chloride. Test and adjust the pH of the waters
after the first 1-2 hr of extraction. Extract for 18-24 hours.
10.3.1 Repeat Section 10.2.3, except label as the acid fraction.
[[Page 327]]
10.4 Concentration--concentrate the extracts in separate 500 mL K-D
flasks equipped with 10 mL concentrator tubes.
10.4.1 Add 1 to 2 clean boiling chips to the flask and attach a
three-ball macro Snyder column. Prewet the column by adding
approximately one mL of methylene chloride through the top. Place the K-
D apparatus in a hot water bath so that the entire lower rounded surface
of the flask is bathed with steam. Adjust the vertical position of the
apparatus and the water temperature as required to complete the
concentration in 15 to 20 minutes. At the proper rate of distillation,
the balls of the column will actively chatter but the chambers will not
flood. When the liquid has reached an apparent volume of 1 mL, remove
the K-D apparatus from the bath and allow the solvent to drain and cool
for at least 10 minutes. Remove the Snyder column and rinse the flask
and its lower joint into the concentrator tube with 1-2 mL of methylene
chloride. A 5-mL syringe is recommended for this operation.
10.4.2 For performance standards (Sections 8.2 and 12.7) and for
blanks (Section 8.5), combine the acid and base/neutral extracts for
each at this point. Do not combine the acid and base/neutral extracts
for samples.
10.5 Add a clean boiling chip and attach a two ball micro Snyder
column to the concentrator tube. Prewet the column by adding approx 0.5
mL methylene chloride through the top. Place the apparatus in the hot
water bath. Adjust the vertical position and the water temperature as
required to complete the concentration in 5-10 minutes. At the proper
rate of distillation, the balls of the column will actively chatter but
the chambers will not flood. When the liquid reaches an apparent volume
of approx 0.5 mL, remove the apparatus from the water bath and allow to
drain and cool for at least 10 minutes. Remove the micro Snyder column
and rinse its lower joint into the concentrator tube with approx 0.2 mL
of methylene chloride. Adjust the final volume to 1.0 mL.
10.6 Transfer the concentrated extract to a clean screw-cap vial.
Seal the vial with a Teflon-lined lid, and mark the level on the vial.
Label with the sample number and fraction, and store in the dark at -20
to -10 [deg]C until ready for analysis.
11. GC/MS Analysis
11.1 Establish the operating conditions given in Table 3 or 4 for
analysis of the base/neutral or acid extracts, respectively. For
analysis of combined extracts (Section 10.4.2), use the operating
conditions in Table 3.
11.2 Bring the concentrated extract (Section 10.6) or standard
(Sections 6.13 through 6.14) to room temperature and verify that any
precipitate has redissolved. Verify the level on the extract (Sections
6.6 and 10.6) and bring to the mark with solvent if required.
11.3 Add the internal standard solution (Section 6.10) to the
extract (use 1.0 uL of solution per 0.1 mL of extract) immediately prior
to injection to minimize the possibility of loss by evaporation,
adsorption, or reaction. Mix thoroughly.
11.4 Inject a volume of the standard solution or extract such that
100 ng of the internal standard will be injected, using on-column or
splitless injection. For 1 mL extracts, this volume will be 1.0 uL.
Start the GC column initial isothermal hold upon injection. Start MS
data collection after the solvent peak elutes. Stop data collection
after the benzo (ghi) perylene or pentachlorophenol peak elutes for the
base/neutral or acid fraction, respectively. Return the column to the
initial temperature for analysis of the next sample.
12. System and Laboratory Performance
12.1 At the beginning of each 8 hr shift during which analyses are
performed, GC/MS system performance and calibration are verified for all
pollutants and labeled compounds. For these tests, analysis of the 100
[micro]g/mL calibration standard (Section 6.13) shall be used to verify
all performance criteria. Adjustment and/or recalibration (per Section
7) shall be performed until all performance criteria are met. Only after
all performance criteria are met may samples, blanks, and precision and
recovery standards be analyzed.
12.2 DFTPP spectrum validity--inject 1 [micro]L of the DFTPP
solution (Section 6.11) either separately or within a few seconds of
injection of the standard (Section 12.1) analyzed at the beginning of
each shift. The criteria in Table 5 shall be met.
12.3 Retention times--the absolute retention time of 2,2'-
difluorobiphenyl shall be within the range of 1078 to 1248 seconds and
the relative retention times of all pollutants and labeled compounds
shall fall within the limits given in Tables 3 and 4.
12.4 GC resolution--the valley height between anthracene and
phenanthrene at m/z 178 (or the analogs at m/z 188) shall not exceed 10
percent of the taller of the two peaks.
12.5 Calibration verification--compute the concentration of each
pollutant (Tables 1 and 2) by isotope dilution (Section 7.4) for those
compounds which have labeled analogs. Compute the concentration of each
pollutant which has no labeled analog by the internal standard method
(Section 7.5). Compute the concentration of the labeled compounds by the
internal standard method. These concentrations are computed based on the
calibration data determined in Section 7.
12.5.1 For each pollutant and labeled compound being tested, compare
the concentration with the calibration verification limit
[[Page 328]]
in Table 8. If all compounds meet the acceptance criteria, calibration
has been verified and analysis of blanks, samples, and precision and
recovery standards may proceed. If, however, any compound fails, the
measurement system is not performing properly for that compound. In this
event, prepare a fresh calibration standard or correct the problem
causing the failure and repeat the test (Section 12.1), or recalibrate
(Section 7).
12.6 Multiple peaks--each compound injected shall give a single,
distinct GC peak.
12.7 On-going precision and accuracy.
12.7.1 Analyze the extract of one of the pair of precision and
recovery standards (Section 10.1.3) prior to analysis of samples from
the same lot.
12.7.2 Compute the concentration of each pollutant (Tables 1 and 2)
by isotope dilution (Section 7.4) for those compounds which have labeled
analogs. Compute the concentration of each pollutant which has no
labeled analog by the internal standard method (Section 7.5). Compute
the concentration of the labeled compounds by the internal standard
method.
12.7.3 For each pollutant and labeled compound, compare the
concentration with the limits for on-going accuracy in Table 8. If all
compounds meet the acceptance criteria, system performance is acceptable
and analysis of blanks and samples may proceed. If, however, any
individual concentration falls outside of the range given, system
performance is unacceptable for that compound.
Note: The large number of compounds in Table 8 present a substantial
probability that one or more will fail when all compounds are analyzed.
To determine if the extraction/concentration system is out of control or
if the failure is caused by probability, proceed as follows:
12.7.3.1 Analyze the second aliquot of the pair of precision and
recovery standard (Section 10.1.3).
12.7.3.2 Compute the concentration of only those pollutants or
labeled compounds that failed the previous test (Section 12.7.3). If
these compounds now pass, the extraction/concentration processes are in
control and analysis of blanks and samples may proceed. If, however, any
of the same compounds fail again, the extraction/concentration processes
are not being performed properly for these compounds. In this event,
correct the problem, re-extract the sample lot (Section 10) and repeat
the on-going precision and recovery test (Section 12.7).
12.7.4 Add results which pass the specifications in Section 12.7.2
to initial and previous on-going data. Update QC charts to perform a
graphic representation of continued laboratory performance (Figure 5).
Develop a statement of laboratory accuracy for each pollutant and
labeled compound by calculating the average percent recovery (R) and the
standard deviation of percent recovery (sr). Express the
accuracy as a recovery interval from R-2sr to
R+2sr. For example, if R=95% and sr=5%, the
accuracy is 85-105%.
13. Qualitative Determination
13.1 Qualititative determination is accomplished by comparison of
data from analysis of a sample or blank with data from analysis of the
shift standard (Section 12.1) and with data stored in the spectral
libraries (Section 7.2.4). Identification is confirmed when spectra and
retention times agree per the criteria below.
13.2 Labeled compounds and pollutants having no labeled analog:
13.2.1 The signals for all characteristic masses stored in the
spectral library (Section 7.2.4) shall be present and shall maximize
within the same two consecutive scans.
13.2.2 Either (1) the background corrected EICP areas, or (2) the
corrected relative intensities of the mass spectral peaks at the GC peak
maximum shall agree within a factor of two (0.5 to 2 times) for all
masses stored in the library.
13.2.3 The retention time relative to the nearest eluted internal
standard shall be within 15 scans or 15 seconds, whichever is greater of this difference in
the shift standard (Section 12.1).
13.3 Pollutants having a labled analog:
13.3.1 The signals for all characteristic masses stored in the
spectral library (Section 7.2.4) shall be present and shall maximize
within the same two consecutive scans.
13.3.2. Either (1) the background corrected EICP areas, or (2) the
corrected relative intensities of the mass spectral peaks at the GC peak
maximum shall agree within a factor of two for all masses stored in the
spectral library.
13.3.3. The retention time difference between the pollutant and its
labeled analog shall agree within 6 scans or
6 seconds (whichever is greater) of this
difference in the shift standard (Section 12.1).
13.4 Masses present in the experimental mass spectrum that are not
present in the reference mass spectrum shall be accounted for by
contaminant or background ions. If the experimental mass spectrum is
contaminated, an experienced spectrometrist (Section 1.4) is to
determine the presence or absence of the cmmpound.
14. Quantitative Determination
14.1 Isotope dilution--by adding a known amount of a labeled
compound to every sample prior to extraction, correction for recovery of
the pollutant can be made because the pollutant and its labeled analog
exhibit the same effects upon extraction, concentration, and gas
chromatography. Relative response (RR) values for mixtures are used in
conjunction with calibration curves described in
[[Page 329]]
Section 7.4 to determine concentrations directly, so long as labeled
compound spiking levels are constant. For the phenml example given in
Figure 1 (Section 7.4.1), RR would be equal to 1.114. For this RR value,
the phenol calibration curve given in Figure 1 indicates a concentration
of 27 [micro]g/mL in the sample extract (Cex).
14.2 Internal standard--compute the concentration in the extract
using the response factor determined from calibration data (Section 7.5)
and the following equation: Cex([micro]g/mL)=(As x
Cis/(Ais x RF) where Cex is the
concentration of the compound in the extract, and the other terms are as
defined in Section 7.5.1.
14.3 The concentration of the pollutant in water is computed using
the volumes of the original water sample (Section 10.1) and the final
extract volume (Section 10.5), as follows: Concentration in water
([micro]g/L)=(Cex x Vex)/Vs where
Vex is the extract volume in mL, and Vs is the
sample volume in liters.
14.4 If the EICP area at the quantitiation mass for any compound
exceeds the calibration range of the system, the extract of the dilute
aliquot (Section 10.1) is analyzed by isotope dilution; otherwise, the
extract is diluted by a factor of 10, 9 [micro]L of internal standard
solution (Section 6.10) are added to a 1.0 mL aliquot, and this diluted
extract is analyzed by the internal standard method (Section 14.2).
Quantify each compound at the highest concentration level within the
calibration range.
14.5 Report results for all pollutants and labeled compounds (Tables
1 and 2) found in all standards, blanks, and samples in [micro]g/L, to
three significant figures. Results for samples which have been diluted
are reported at the least dilute level at which the area at the
quantitation mass is within the calibration range (Section 14.4) and the
labeled compound recovery is within the normal range for the method
(Section 15.4).
15. Analysis of Complex Samples
15.1 Untreated effluents and other samples frequently contain high
levels (1000 [micro]g/L) of the compounds of interest,
interfering compounds, and/or polymeric materials. Some samples will not
concentrate to one mL (Section 10.5); others will overload the GC column
and/or mass spectrometer.
15.2 Analyze the dilute aliquot (Section 10.1) when the sample will
not concentrate to 1.0 mL. If a dilute aliquot was not extracted, and
the sample holding time (Section 9.3) has not been exceeded, dilute an
aliquot of the sample with reagent water and re-extract (Section 10.1);
otherwise, dilute the extract (Section 14.4) and analyze by the internal
standard method (Section 14.2).
15.3 Recovery of internal standard--the EICP area of the internal
standard should be within a factor of two of the area in the shift
standard (Section 12.1). If the absolute areas of the labeled compounds
are within a factor of two of the respective areas in the shift
standard, and the internal standard area is less than one-half of its
respective area, then internal standard loss in the extract has
occurred. In this case, use one of the labeled compounds (perferably a
polynuclear aromatic hydrocarbon) to compute the concentration of a
pollutant with no labeled analog.
15.4 Recovery of labeled compounds--in most samples, labeled
compound recoveries will be similar to those from reagent water (Section
12.7). If the labeled compound recovery is outside the limits given in
Table 8, the dilute extract (Section 10.1) is analyzed as in Section
14.4. If the recoveries of all labeled compounds and the internal
staldard are low (per the criteria above), then a loss in instrument
sensitivity is the most likely cause. In this case, the 100 [micro]g/mL
calibration standard (Section 12.1) shall be analyzed and calibration
verified (Section 12.5). If a loss in sensitivity has occurred, the
instrument shall be repaired, the performance specifications in Section
12 shall be met, and the extract reanalyzed. If a loss in instrument
sensitivity has not occurred, the method does not work on the sample
being analyzed and the result may not be reported for regulatory
compliance purposes.
16. Method Performance
16.1 Interlaboratory performance for this method is detailed in
references 9 and 10.
16.2 A chromatogram of the 100 [micro]g/mL acid/base/neutral
calibration standard (Section 6.13) is shown in Figure 6.
References
1. ``Performance Tests for the Evaluation of Computerized Gas
Chromatography/Mass Spectrometry Equipment and Laboratories'' USEPA,
EMSL/Cincinnati, OH 45268, EPA-600/4-80-025 (April 1980).
2. ``Working with Carcinogens,'' DHEW, PHS, CDC, NIOSH, Publication
77-206, (August 1977).
3. ``OSHA Safety and Health Standards, General Industry'' OSHA 2206,
29 CFR part 1910 (January 1976).
4. ``Safety in Academic Chemistry Laboratories, '' ACS Committee on
Chemical Safety (1979).
5. ``Reference Compound to Calibrate Ion Abundance Measurement in
Gas Chromatography-Mass Spectrometry Systems,'' J.W. Eichelberger, L.E.
Harris, and W.L. Budde, Anal. Chem., 47, 955 (1975).
6. ``Handbook of Analytical Quality Control in Water and Wastewater
Laboratories,'' USEPA, EMSL/Cincinnati, OH 45268, EPA-600/4-79-019
(March 1979).
7. ``Standard Practice for Sampling Water,'' ASTM Annual Book of
Standards, ASTM, Philadelphia, PA, 76 (1980).
[[Page 330]]
8. ``Methods 330.4 and 330.5 for Total Residual Chlorine,'' USEPA,
EMSL/ Cincinnati, OH 45268, EPA 600/4-70-020 (March 1979).
9. Colby, B.N., Beimer, R.G., Rushneck, D.R., and Telliard, W.A.,
``Isotope Dilution Gas Chromatography-Mass Spectrometry for the
determination of Priority Pollutants in Industrial Effluents.'' USEPA,
Effluent Guidelines Division, Washington, DC 20460 (1980).
10. ``Inter-laboratory Validation of US Environmental Protection
Agency Method 1625,'' USEPA, Effluent Guidelines Division, Washington,
DC 20460 (June 15, 1984).
Table 1--Base/Neutral Extractable Compounds
------------------------------------------------------------------------
CAS
Compound STORET registry EPA-EGD NPDES
------------------------------------------------------------------------
Acenaphthene................. 34205 83-32-9 001 B 001 B
Acenaphthylene............... 34200 208-96-8 077 B 002 B
Anthracene................... 34220 120-12-7 078 B 003 B
Benzidine.................... 39120 92-87-5 005 B 004 B
Benzo(a)anthracene........... 34526 56-55-3 072 B 005 B
Benzo(b)fluoranthene......... 34230 205-99-2 074 B 007 B
Benzo(k)fluoranthene......... 34242 207-08-9 075 B 009 B
Benzo(a)pyrene............... 34247 50-32-8 073 B 006 B
Benzo(ghi)perylene........... 34521 191-24-2 079 B 008 B
Biphenyl (Appendix C)........ 81513 92-52-4 512 B ........
Bis(2-chloroethyl) ether..... 34273 111-44-4 018 B 011 B
Bis(2-chloroethyoxy)methane.. 34278 111-91-1 043 B 010 B
Bis(2-chloroisopropyl) ether. 34283 108-60-1 042 B 012 B
Bis(2-ethylhexyl) phthalate.. 39100 117-81-7 066 B 013 B
4-bromophenyl phenyl ether... 34636 101-55-3 041 B 014 B
Butyl benzyl phthalate....... 34292 85-68-7 067 B 015 B
n-C10 (Appendix C)........... 77427 124-18-5 517 B ........
n-C12 (Appendix C)........... 77588 112-40-2 506 B ........
n-C14 (Appendix C)........... 77691 629-59-4 518 B ........
n-C16 (Appendix C)........... 77757 544-76-3 519 B ........
n-C18 (Appendix C)........... 77804 593-45-3 520 B ........
n-C20 (Appendix C)........... 77830 112-95-8 521 B ........
n-C22 (Appendix C)........... 77859 629-97-0 522 B ........
n-C24 (Appendix C)........... 77886 646-31-1 523 B ........
n-C26 (Appendix C)........... 77901 630-01-3 524 B ........
n-C28 (Appendix C)........... 78116 630-02-4 525 B ........
n-C30 (Appendix C)........... 78117 638-68-6 526 B ........
Carbazole (4c)............... 77571 86-74-8 528 B ........
2-chloronaphthalene.......... 34581 91-58-7 020 B 016 B
4-chlorophenyl phenyl ether.. 34641 7005-72-3 040 B 017 B
Chrysene..................... 34320 218-01-9 076 B 018 B
P-cymene (Appendix C)........ 77356 99-87-6 513 B ........
Dibenzo(a,h)anthracene....... 34556 53-70-3 082 B 019 B
Dibenzofuran (Appendix C and 81302 132-64-9 505 B ........
4c).........................
Dibenzothiophene (Synfuel)... 77639 132-65-0 504 B ........
Di-n-butyl phthalate......... 39110 84-74-2 068 B 026 B
1,2-dichlorobenzene.......... 34536 95-50-1 025 B 020 B
1,3-dichlorobenzene.......... 34566 541-73-1 026 B 021 B
1,4-dichlorobenzene.......... 34571 106-46-7 027 B 022 B
3,3'-dichlorobenzidine....... 34631 91-94-1 028 B 023 B
Diethyl phthalate............ 34336 84-66-2 070 B 024 B
2,4-dimethylphenol........... 34606 105-67-9 034 A 003 A
Dimethyl phthalate........... 34341 131-11-3 071 B 025 B
2,4-dinitrotoluene........... 34611 121-14-2 035 B 027 B
2,6-dinitrotoluene........... 34626 606-20-2 036 B 028 B
Di-n-octyl phthalate......... 34596 117-84-0 069 B 029 B
Diphenylamine (Appendix C)... 77579 122-39-4 507 B ........
Diphenyl ether (Appendix C).. 77587 101-84-8 508 B ........
1,2-diphenylhydrazine........ 34346 122-66-7 037 B 030 B
Fluoranthene................. 34376 206-44-0 039 B 031 B
Fluorene..................... 34381 86-73-7 080 B 032 B
Hexachlorobenzene............ 39700 118-74-1 009 B 033 B
Hexachlorobutadiene.......... 34391 87-68-3 052 B 034 B
Hexachloroethane............. 34396 67-72-1 012 B 036 B
Hexachlorocyclopentadiene.... 34386 77-47-4 053 B 035 B
Indeno(1,2,3-cd)pyrene....... 34403 193-39-5 083 B 037 B
Isophorone................... 34408 78-59-1 054 B 038 B
Naphthalene.................. 34696 91-20-3 055 B 039 B
B-naphthylamine (Appendix C). 82553 91-59-8 502 B ........
Nitrobenzene................. 34447 98-95-3 056 B 040 B
N-nitrosodimethylamine....... 34438 62-75-9 061 B 041 B
N-nitrosodi-n-propylamine.... 34428 621-64-7 063 B 042 B
N-nitrosodiphenylamine....... 34433 86-30-3 062 B 043 B
[[Page 331]]
Phenanthrene................. 34461 85-01-8 081 B 044 B
Phenol....................... 34694 108-95-2 065 A 010 A
a-Picoline (Synfuel)......... 77088 109-06-89 503 B ........
Pyrene....................... 34469 129-00-0 084 B 045 B
styrene (Appendix C)......... 77128 100-42-5 510 B ........
a-terpineol (Appendix C)..... 77493 98-55-5 509 B ........
1,2,3-trichlorobenzene (4c).. 77613 87-61-6 529 B ........
1,2,4-trichlorobenzene....... 34551 120-82-1 008 B 046 B
------------------------------------------------------------------------
Table 2--Acid Extractable Compounds
------------------------------------------------------------------------
CAS
Compound STORET registry EPA-EGD NPDES
------------------------------------------------------------------------
4-chloro-3-methylphenol...... 34452 59-50-7 022 A 008 A
2-chlorophenol............... 34586 95-57-8 024 A 001 A
2,4-dichlorophenol........... 34601 120-83-2 031 A 002 A
2,4-dinitrophenol............ 34616 51-28-5 059 A 005 A
2-methyl-4,6-dinitrophenol... 34657 534-52-1 060 A 004 A
2-nitrophenol................ 34591 88-75-5 057 A 006 A
4-nitrophenol................ 34646 100-02-7 058 A 007 A
Pentachlorophenol............ 39032 87-86-5 064 A 009 A
2,3,6-trichlorophenol (4c)... 77688 93-37-55 530 A ........
2,4,5-trichlorophenol (4c)... ........ 95-95-4 531 A ........
2,4,6-trichlorophenol........ 34621 88-06-2 021 A 011 A
------------------------------------------------------------------------
Table 3--Gas Chromatography of Base/Neutral Extractable Compounds
------------------------------------------------------------------------
Retention time Detection
EGD ------------------------------------ limit \2\
No. Compound Mean ([micro]g/
\1\ (sec) EGD Ref Relative L)
------------------------------------------------------------------------
164 2,2'- 1163 164 1.000-1.000 10
difluorobipheny
l (int std)....
061 N- 385 164 ns 50
nitrosodimethyl
amine..........
603 alpha picoline- 417 164 0.326-0.393 50
d7.............
703 alpha picoline.. 426 603 1.006-1.028 50
610 styrene-d5...... 546 164 0.450-0.488 10
710 styrene......... 549 610 1.002-1.009 10
613 p-cymene-d14.... 742 164 0.624-0.652 10
713 p-cymene........ 755 613 1.008-1.023 10
265 phenol-d5....... 696 164 0.584-0.613 10
365 phenol.......... 700 265 0.995-1.010 10
218 bis(2- 696 164 0.584-0.607 10
chloroethyl)
ether-d8.......
318 bis(2- 704 218 1.007-1.016 10
chloroethyl)
ether..........
617 n-decane-d22.... 698 164 0.585-0.615 10
717 n-decane........ 720 617 1.022-1.038 10
226 1,3- 722 164 0.605-0.636 10
dichlorobenzene-
d4.............
326 1,3- 724 226 0.998-1.008 10
dichlorobenzene
227 1,4- 737 164 0.601-0.666 10
dichlorobenzene-
d4.............
327 1,4- 740 227 0.997-1.009 10
dichlorobenzene
225 1,2- 758 164 0.632-0.667 10
dichlorobenzene-
d4.............
325 1,2- 760 225 0.995-1.008 10
dichlorobenzene
242 bis(2- 788 164 0.664-0.691 10
chloroisopropyl
) ether-d12....
342 bis(2- 799 242 1.010-1.016 10
chloroisopropyl
) ether........
212 hexachloroethane- 819 164 0.690-0.717 10
13C............
312 hexachloroethane 823 212 0.999-1.001 10
063 N-nitrosodi-n- 830 164 ns 20
propylamine....
256 nitrobenzene-d5. 845 164 0.706-0.727 10
356 nitrobenzene.... 849 256 1.002-1.007 10
254 isophorone-d8... 881 164 0.747-0.767 10
354 isophorone...... 889 254 0.999-1.017 10
234 2,4-dimethyl 921 164 0.781-0.803 10
phenol-d3......
334 2,4- 924 234 0.999-1.003 10
dimethylphenol.
043 bis(2- 939 164 ns 10
chloroethoxy)
methane........
208 1,2,4- 955 164 0.813-0.830 10
trichlorobenzen
e-d3...........
308 1,2,4- 958 208 1.000-1.005 10
trichlorobenzen
e..............
255 naphthalene-d8.. 963 164 0.819-0.836 10
355 naphthalene..... 967 255 1.001-1.006 10
609 alpha-terpineol- 973 164 0.829-0.844 10
d3.............
[[Page 332]]
709 alpha-terpineol. 975 609 0.998-1.008 10
606 n-dodecane-d26.. 953 164 0.730-0.908 10
706 n-dodecane...... 981 606 0.986-1.051 10
529 1,2,3- 1003 164 ns 10
trichlorobenzen
e..............
252 hexachlorobutadi 1005 164 0.856-0.871 10
ene-13C4.......
352 hexachlorobutadi 1006 252 0.999-1.002 10
ene............
253 hexachlorocyclop 1147 164 0.976-0.986 10
entadiene-13C4.
353 hexachlorocyclop 1142 253 0.999-1.001 10
entadiene......
220 2- 1185 164 1.014-1.024 10
chloronaphthale
ne-d7..........
320 2- 1200 220 0.997-1.007 10
chloronaphthale
ne.............
518 n-tetradecane... 1203 164 ns 10
612 Biphenyl-d10.... 1205 164 1.016-1.027 10
712 Biphenyl........ 1195 612 1.001-1.006 10
608 Diphenyl ether- 1211 164 1.036-1.047 10
d10............
708 Diphenyl ether.. 1216 608 0.997-1.009 10
277 Acenaphthylene- 1265 164 1.080-1.095 10
d8.............
377 Acenaphthylene.. 1247 277 1.000-1.004 10
271 Dimethyl 1269 164 1.083-1.102 10
phthalate-d4...
371 Dimethyl 1273 271 0.998-1.005 10
phthalate......
236 2,6- 1283 164 1.090-1.112 10
dinitrotoluene-
d3.............
336 2,6- 1300 236 1.001-1.005 10
dinitrotoluene.
201 Acenaphthene-d10 1298 164 1.107-1.125 10
301 Acenaphthene.... 1304 201 0.999-1.009 10
605 Dibenzofuran-d8. 1331 164 1.134-1.155 10
705 Dibenzofuran.... 1335 605 0.998-1.007 10
602 Beta- 1368 164 1.163-1.189 50
naphthylamine-
d7.............
702 Beta- 1371 602 0.996-1.007 50
naphthylamine..
280 Fluorene-d10.... 1395 164 1.185-1.214 10
380 Fluorene........ 1401 281 0.999-1.008 10
240 4-chlorophenyl 1406 164 1.194-1.223 10
phenyl ether-d5
340 4-chlorophenyl 1409 240 0.990-1.015 10
phenyl ether...
270 Diethyl 1409 164 1.197-1.229 10
phthalate-d4...
370 Diethyl 1414 270 0.996-1.006 10
phthalate......
619 n-hexadecane-d34 1447 164 1.010-1.478 10
719 n-hexadecane.... 1469 619 1.013-1.020 10
235 2,4- 1359 164 1.152-1.181 10
dinitrotoluene-
d3.............
335 2,4- 1344 235 1.000-1.002 10
dinitrotoluene.
237 1,2- 1433 164 1.216-1.248 20
diphenylhydrazi
ne-d8..........
337 1,2- 1439 237 0.999-1.009 20
diphenylhydrazi
ne (\3\).......
607 Diphenylamine- 1437 164 1.213-1.249 20
d10............
707 Diphenylamine... 1439 607 1.000-1.007 20
262 N- 1447 164 1.225-1.252 20
nitrosodiphenyl
amine-d6.......
362 N- 1464 262 1.000-1.002 20
nitrosodiphenyl
amine (\4\)....
041 4-bromophenyl 1498 164 1.271-1.307 10
phenyl ether...
209 Hexachlorobenzen 1521 164 1.288-1.327 10
e-13C6.........
309 Hexachlorobenzen 1522 209 0.999-1.001 10
e..............
281 Phenanthrene-d10 1578 164 1.334-1.380 10
520 n-octadecane.... 1580 164 ns 10
381 Phenanthrene.... 1583 281 1.000-1.005 10
278 Anthracene-d10.. 1588 164 1.342-1.388 10
378 Anthracene...... 1592 278 0.998-1.006 10
604 Dibenzothiophene- 1559 164 1.314-1.361 10
d8.............
704 Dibenzothiophene 1564 604 1.000-1.006 10
528 Carbazole....... 1650 164 ns 20
621 n-eicosane-d42.. 1655 164 1.184-1.662 10
721 n-eicosane...... 1677 621 1.010-1.021 10
268 Di-n-butyl 1719 164 1.446-1.510 10
phthalate-d4...
368 Di-n-butyl 1723 268 1.000-1.003 10
phthalate......
239 Fluoranthene-d10 1813 164 1.522-1.596 10
339 Fluoranthene.... 1817 239 1.000-1.004 10
284 Pyrene-d10...... 1844 164 1.523-1.644 10
384 Pyrene.......... 1852 284 1.001-1.003 10
205 Benzidine-d8.... 1854 164 1.549-1.632 50
305 Benzidine....... 1853 205 1.000-1.002 50
522 n-docosane...... 1889 164 ns 10
623 n-tetracosane- 1997 164 1.671-1.764 10
d50............
723 n-tetracosane... 2025 612 1.012-1.015 10
067 Butylbenzyl 2060 164 ns 10
phthalate......
276 Chrysene-d12.... 2081 164 1.743-1.837 10
376 Chrysene........ 2083 276 1.000-1.004 10
[[Page 333]]
272 Benzo(a)anthrace 2082 164 1.735-1.846 10
ne-d12.........
372 Benzo(a)anthrace 2090 272 0.999-1.007 10
ne.............
228 3,3'- 2088 164 1.744-1.848 50
dichlorobenzidi
ne-d6..........
328 3,3'- 2086 228 1.000-1.001 50
dichlorobenzidi
ne.............
266 Bis(2- 2123 164 1.771-1.880 10
ethylhexyl)
phthalate-d4...
366 Bis(2- 2124 266 1.000-1.002 10
ethylhexyl)
phthalate......
524 n-hexacosane.... 2147 164 ns 10
269 di-n-octyl 2239 164 1.867-1.982 10
phthalate-d4...
369 di-n-octyl 2240 269 1.000-1.002 10
phthalate......
525 n-octacosane.... 2272 164 ns 10
274 Benzo(b)fluorant 2281 164 1.902-2.025 10
hene-d12.......
354 Benzo(b)fluorant 2293 274 1.000-1.005 10
hene...........
275 Benzo(k)fluorant 2287 164 1.906-2.033 10
hene-d12.......
375 Benzo(k)fluorant 2293 275 1.000-1.005 10
hene...........
273 Benzo(a)pyrene- 2351 164 1.954-2.088 10
d12............
373 Benzo(a)pyrene.. 2350 273 1.000-1.004 10
626 N-triacontane- 2384 164 1.972-2.127 10
d62............
726 N-triacontane... 2429 626 1.011-1.028 10
083 Indeno(1,2,3- 2650 164 ns 20
cd)pyrene......
082 Dibenzo(a,h)anth 2660 164 ns 20
racene.........
279 Benzo(ghi)peryle 2741 164 2.187-2.524 20
ne-d12.........
379 Benzo(ghi)peryle 2750 279 1.001-1.006 20
ne.............
------------------------------------------------------------------------
\1\ Reference numbers beginning with 0, 1 or 5 indicate a pollutant
quantified by the internal standard method; reference numbers
beginning with 2 or 6 indicate a labeled compound quantified by the
internal standard method; reference numbers beginning with 3 or 7
indicate a pollutant quantified by isotope dilution.
\2\ This is a minimum level at which the entire GC/MS system must give
recognizable mass spectra (background corrected) and acceptable
calibration points.
\3\ Detected as azobenzene.
\4\ Detected as diphenylamine.
ns = specification not available at time of release of method.
Column: 30 2 m x 0.25 0.02
mm i.d. 94% methyl, 4% phenyl, 1% vinyl bonded phase fused silica
capillary.
Temperature program: 5 min at 30 [deg]C; 30 - 280 [deg]C at 8 [deg]C per
min; isothermal at 280 [deg]C until benzo(ghi)perylene elutes.
Gas velocity: 30 5 cm/sec.
Table 4--Gas Chromatography of Acid Extractable Compounds
------------------------------------------------------------------------
Retention time Detection
EGD ------------------------------------ limit \2\
No. Compound Mean ([micro]g/
\1\ (sec) EGD Ref Relative L)
------------------------------------------------------------------------
164 2,2'- 1163 164 1.000-1.000 10
difluorobipheny
l (int std)....
224 2-chlorophenol- 701 164 0.587-0.618 10
d4.............
324 2-chlorophenol.. 705 224 0.997-1.010 10
257 2-nitrophenol-d4 898 164 0.761-0.783 20
357 2-nitrophenol... 900 257 0.994-1.009 20
231 2,4- 944 164 0.802-0.822 10
dichlorophenol-
d3.............
331 2,4- 947 231 0.997-1.006 10
dichlorophenol.
222 4-chloro-3- 1086 164 0.930-0.943 10
methylphenol-d2
322 4-chloro-3- 1091 222 0.998-1.003 10
methylphenol...
221 2,4,6- 1162 164 0.994-1.005 10
trichlorophenol-
d2.............
321 2,4,6- 1165 221 0.998-1.004 10
trichlorophenol
531 2,4,5- 1170 164 ns 10
trichlorophenol
530 2,3,6- 1195 164 ns 10
trichlorophenol
259 2,4- 1323 164 1.127-1.149 50
dinitrophenol-
d3.............
359 2,4- 1325 259 1.000-1.005 50
dinitrophenol..
258 4-nitrophenol-d4 1349 164 1.147-1.175 50
358 4-nitrophenol... 1354 258 0.997-1.006 50
260 2-methyl-4,6- 1433 164 1.216-1.249 20
dinitrophenol-
d2.............
360 2-methyl-4,6- 1435 260 1.000-1.002 20
dinitrophenol..
264 Pentachloropheno 1559 164 1.320-1.363 50
l-13C6.........
364 Pentachloropheno 1561 264 0.998-1.002 50
l..............
------------------------------------------------------------------------
\1\ Reference numbers beginning with 0, 1 or 5 indicate a pollutant
quantified by the internal standard method; reference numbers
beginning with 2 or 6 indicate a labeled compound quantified by the
internal standard method; reference numbers beginning with 3 or 7
indicate a pollutant quantified by isotope dilution.
\2\ This is a minimum level at which the entire GC/MS system must give
recognizable mass spectra (background corrected) and acceptable
calibration points.
ns=specification not available at time of release of method.
Column: 30 2mx0.25 0.02mm
i.d. 94% methyl, 4% phenyl, 1% vinyl bonded phase fused silica
capillary.
Temperature program: 5 min at 30 [deg]C; 8 [deg]C/min. to 250[deg]C or
until pentachlorophenol elutes.
Gas velocity: 30 5 cm/sec.
[[Page 334]]
Table 5--DFTPP Mass Intensity Specifications
------------------------------------------------------------------------
Mass Intensity required
------------------------------------------------------------------------
51 30-60 percent of mass 198.
68 Less than 2 percent of mass 69.
70 Less than 2 percent of mass 69.
127 40-60 percent of mass 198.
197 Less than 1 percent of mass 198.
199 5-9 percent of mass 198.
275 10-30 percent of mass 198.
365 greater than 1 percent of mass 198
441 present and less than mass 443
442 40-100 percent of mass 198.
443 17-23 percent of mass 442.
------------------------------------------------------------------------
Table 6--Base/Neutral Extractable Compound Characteristic Masses
------------------------------------------------------------------------
Labeled Primary m/
Compound analog z
------------------------------------------------------------------------
Acenaphthene..................................... d10 154/164
Acenaphthylene................................... d8 152/160
Anthracene....................................... d10 178/188
Benzidine........................................ d8 184/192
Benzo(a)anthracene............................... d12 228/240
Benzo(b)fluoranthene............................. d12 252/264
Benzo(k)fluoranthene............................. d12 252/264
Benzo(a)pyrene................................... d12 252/264
Benzo(ghi)perylene............................... d12 276/288
Biphenyl......................................... d10 154/164
Bis(2-chloroethyl) ether......................... d8 93/101
Bis(2-chloroethoxy)methane....................... ......... 93
Bis(2-chloroisopropyl) ether..................... d12 121/131
Bis(2-ethylhexyl) phthalate...................... d4 149/153
4-bromophenyl phenyl ether....................... ......... 248
Butyl benzyl phthalate........................... ......... 149
n-C10............................................ d22 55/66
n-C12............................................ d26 55/66
n-C14............................................ ......... 55
n-C16............................................ d34 55/66
n-C18............................................ ......... 55
n-C20............................................ d42 55/66
n-C22............................................ ......... 55
n-C24............................................ d50 55/66
n-C26............................................ ......... 55
n-C28............................................ ......... 55
n-C30............................................ d62 55/66
Carbazole........................................ d8 167/175
2-chloronaphthalene.............................. d7 162/169
4-chlorophenyl phenyl ether...................... d5 204/209
Chrysene......................................... d12 228/240
p-cymene......................................... d14 114/130
Dibenzo(a,h)anthracene........................... ......... 278
Dibenzofuran..................................... d8 168/176
Dibenzothiophene................................. d8 184/192
Di-n-butyl phthalate............................. d4 149/153
1,2-dichlorobenzene.............................. d4 146/152
1,3-dichlorobenzene.............................. d4 146/152
1,4-dichlorobenzene.............................. d4 146/152
3,3'-dichlorobenzidine........................... d6 252/258
Diethyl phthalate................................ d4 149/153
2,4-dimethylphenol............................... d3 122/125
Dimethyl phthalate............................... d4 163/167
2,4-dinitrotoluene............................... d3 164/168
2,6-dinitrotoluene............................... d3 165/167
Di-n-octyl phthalate............................. d4 149/153
Diphenylamine.................................... d10 169/179
Diphenyl ether................................... d10 170/180
1,2-diphenylhydrazine \1\........................ d10 77/82
Fluoranthene..................................... d10 202/212
Fluorene......................................... d10 166/176
Hexachlorobenzene................................ 13C6 284/292
Hexachlorobutadiene.............................. 13C4 225/231
Hexachloroethane................................. 13C 201/204
Hexachlorocyclopentadiene........................ 13C4 237/241
Ideno(1,2,3-cd)pyrene............................ ......... 276
Isophorone....................................... d8 82/88
Naphthalene...................................... d8 128/136
B-naphthylamine.................................. d7 143/150
Nitrobenzene..................................... d5 123/128
N-nitrosodimethylamine........................... ......... 74
N-nitrosodi-n-propylamine........................ ......... 70
N-nitrosodiphenylamile \2\....................... d6 169/175
Phenanthrene..................................... d10 178/188
Phenol........................................... d5 94/71
a-picoline....................................... d7 93/100
Pyrene........................................... d10 202/212
Styrene.......................................... d5 104/109
a-terpineol...................................... d3 59/62
1,2,3-trichlorobenzene........................... d3 180/183
1,2,4-trichlorobenzene........................... d3 180/183
------------------------------------------------------------------------
\1\ Detected as azobenzene.
\2\ Detected as diphenylamine.
Table 7--Acid Extractable Compound Characteristic Masses
------------------------------------------------------------------------
Labeled Primary m/
Compound analog z
------------------------------------------------------------------------
4-chloro-3-methylphenol.......................... d2 107/109
2-chlorophenol................................... d4 128/132
2,4-dichlorophenol............................... d3 162/167
2,4-dinitrophenol................................ d3 184/187
2-methyl-4,6-dinitrophenol....................... d2 198/200
2-nitrophenol.................................... d4 139/143
4-nitrophenol.................................... d4 139/143
Pentachlorophenol................................ 13C6 266/272
2,3,6-trichlorophenol............................ d2 196/200
2,4,5-trichlorophenol............................ d2 196/200
2,4,6-trichlorophenol............................ d2 196/200
------------------------------------------------------------------------
Table 8--Acceptance Criteria for Performance Tests
----------------------------------------------------------------------------------------------------------------
Acceptance criteria
-----------------------------------------------------------------
EGD Initial precision and Labeled Calibration On-going
No. Compound accuracy section compound verification accuracy
\1\ 8.2.3 ([micro]g/L) recovery sec. sec. 12.5 sec. 11.6 R
----------------------- 8.3 and 14.2 P ([micro]g/ ([micro]g/
s X (percent) mL) L)
----------------------------------------------------------------------------------------------------------------
301 Acenaphthene.......................... 21 79-134 .............. 80-125 72-144
201 Acenaphthene-d10...................... 38 38-147 20-270 71-141 30-180
377 Acenaphtylene......................... 38 69-186 .............. 60-166 61-207
277 Acenaphthylene-d8..................... 31 38-146 23-239 66-152 33-168
[[Page 335]]
378 Anthracene............................ 41 58-174 .............. 60-168 50-199
278 Anthracene-d10........................ 49 31-194 14-419 58-171 23-242
305 Benzidine............................. 119 16-518 .............. 34-296 11-672
205 Benzidine-d8.......................... 269 ns-ns ns-ns ns-ns ns-ns
372 Benzo(a)anthracene.................... 20 65-168 .............. 70-142 62-176
272 Benzo(a)anthracene-d12................ 41 25-298 12-605 28-357 22-329
374 Benzo(b)fluoranthene.................. 183 32-545 .............. 61-164 20-ns
274 Benzo(b)fluoranthene-d12.............. 168 11-577 ns-ns 14-ns ns-ns
375 Benzo(k)fluoranthene.................. 26 59-143 .............. 13-ns 53-155
275 Benzo(k)fluoranthene-d12.............. 114 15-514 ns-ns 13-ns ns-685
373 Benzo(a)pyrene........................ 26 62-195 .............. 78-129 59-206
273 Benzo(a)pyrene-d12.................... 24 35-181 21-290 12-ns 32-194
379 Benzo(ghi)perylene.................... 21 72-160 .............. 69-145 58-168
279 Benzo(ghi)perylene-d12................ 45 29-268 14-529 13-ns 25-303
712 Biphenyl (Appendix C)................. 41 75-148 .............. 58-171 62-176
612 Biphenyl-d12.......................... 43 28-165 ns-ns 52-192 17-267
318 Bis(2-chloroethyl) ether.............. 34 55-196 .............. 61-164 50-213
218 Bis(2-chloroethyl) ether-d8........... 33 29-196 15-372 52-194 25-222
043 Bis(2-chloroethoxy)methane*........... 27 43-153 .............. 44-228 39-166
342 Bis(2-chloroisopropyl) ether.......... 17 81-138 .............. 67-148 77-145
242 Bis(2-chloroisopropyl)ether-d12....... 27 35-149 20-260 44-229 30-169
366 Bis(2-ethylhexyl) phthalate........... 31 69-220 .............. 76-131 64-232
266 Bis(2-ethylhexyl) phthalate-d4........ 29 32-205 18-364 43-232 28-224
041 4-bromophenyl phenyl ether*........... 44 44-140 .............. 52-193 35-172
067 Butyl benzyl phthalate*............... 31 19-233 .............. 22-450 35-170
717 n-C10 (Appendix C).................... 51 24-195 .............. 42-235 19-237
617 n-C10-d22............................. 70 ns-298 ns-ns 44-227 ns-504
706 n-C12 (Appendix C).................... 74 35-369 .............. 60-166 29-424
606 n-C12-d26............................. 53 ns-331 ns-ns 41-242 ns-408
518 n-C14 (Appendix C)*................... 109 ns-985 .............. 37-268 ns-ns
719 n-C16 (Appendix C).................... 33 80-162 .............. 72-138 71-181
619 n-C16-d34............................. 46 37-162 18-308 54-186 28-202
520 n-C18 (Appendix C)*................... 39 42-131 .............. 40-249 35-167
721 n-C20 (Appendix C).................... 59 53-263 .............. 54-184 46-301
621 n-C20-d42............................. 34 34-172 19-306 62-162 29-198
522 n-C22 (Appendix C)*................... 31 45-152 .............. 40-249 39-195
723 n-C24 (Appendix C).................... 11 80-139 .............. 65-154 78-142
623 n-C24-d50............................. 28 27-211 15-376 50-199 25-229
524 n-C26 (Appendix C)*................... 35 35-193 .............. 26-392 31-212
525 n-C28 (Appendix C)*................... 35 35-193 .............. 26-392 31-212
726 n-C30 (Appendix C).................... 32 61-200 .............. 66-152 56-215
626 n-C30-d62............................. 41 27-242 13-479 24-423 23-274
528 Carbazole (4c)*....................... 38 36-165 .............. 44-227 31-188
320 2-chloronaphthalene................... 100 46-357 .............. 58-171 35-442
220 2-chloronaphthalene-d7................ 41 30-168 15-324 72-139 24-204
322 4-chloro-3-methylphenol............... 37 76-131 .............. 85-115 62-159
222 4-chloro-3-methylphenol-d2............ 111 30-174 ns-613 68-147 14-314
324 2-chlorophenol........................ 13 79-135 .............. 78-129 76-138
224 2-chlorophenol-d4..................... 24 36-162 23-255 55-180 33-176
340 4-chlorophenyl phenyl ether........... 42 75-166 .............. 71-142 63-194
240 4-chlorophenyl phenyl ether-d5........ 52 40-161 19-325 57-175 29-212
376 Chrysene.............................. 51 59-186 .............. 70-142 48-221
276 Chrysene-d12.......................... 69 33-219 13-512 24-411 23-290
713 p-cymene (Appendix C)................. 18 76-140 .............. 79-127 72-147
613 p-cymene-d14.......................... 67 ns-359 ns-ns 66-152 ns-468
082 Dibenzo(a,h)anthracene*............... 55 23-299 .............. 13-761 19-340
705 Dibenzofuran (Appendix C)............. 20 85-136 .............. 73-136 79-146
605 Dibenzofuran-d8....................... 31 47-136 28-220 66-150 39-160
704 Dibenzothiophene (Synfuel)............ 31 79-150 .............. 72-140 70-168
604 Dibenzothiophene-d8................... 31 48-130 29-215 69-145 40-156
368 Di-n-butyl phthalate.................. 15 76-165 .............. 71-142 74-169
268 Di-n-butyl phthalate-d4............... 23 23-195 13-346 52-192 22-209
325 1,2-dichlorobenzene................... 17 73-146 .............. 74-135 70-152
225 1,2-dichlorobenzene-d4................ 35 14-212 ns-494 61-164 11-247
326 1,3-dichlorobenzene................... 43 63-201 .............. 65-154 55-225
226 1,3-dichlorobenzene-d4................ 48 13-203 ns-550 52-192 ns-260
327 1,4-dichlorobenzene................... 42 61-194 .............. 62-161 53-219
[[Page 336]]
227 1,4-dichlorobenzene-d4................ 48 15-193 ns-474 65-153 11-245
328 3,3'-dichlorobenzidine................ 26 68-174 .............. 77-130 64-185
228 3,3'-dichlorobenzidine-d6............. 80 ns-562 ns-ns 18-558 ns-ns
331 2,4-dichlorophenol.................... 12 85-131 .............. 67-149 83-135
231 2,4-dichlorophenol-d3................. 28 38-164 24-260 64-157 34-182
370 Diethyl phthalate..................... 44 75-196 .............. 74-135 65-222
270 Diethyl phthalate-d4.................. 78 ns-260 ns-ns 47-211 ns-ns
334 2,4-dimethylphenol.................... 13 62-153 .............. 67-150 60-156
234 2,4-dimethylphenol-d3................. 22 15-228 ns-449 58-172 14-242
371 Dimethyl phthalate.................... 36 74-188 .............. 73-137 67-207
271 Dimethyl phthalate-d4................. 108 ns-640 ns-ns 50-201 ns-ns
359 2,4-dinitrophenol..................... 18 72-134 .............. 75-133 68-141
259 2,4-dinitrophenol-d3.................. 66 22-308 ns-ns 39-256 17-378
335 2,4-dinitrotoluene.................... 18 75-158 .............. 79-127 72-164
235 2,4-dinitrotoluene-d3................. 37 22-245 10-514 53-187 19-275
336 2,6-dinitrotoluene.................... 30 80-141 .............. 55-183 70-159
236 2,6-dinitrotoluene-d3................. 59 44-184 17-442 36-278 31-250
369 Di-n-octyl phthalate.................. 16 77-161 .............. 71-140 74-166
269 Di-n-octyl phthalate-d4............... 46 12-383 ns-ns 21-467 10-433
707 Diphenylamine (Appendix C)............ 45 58-205 .............. 57-176 51-231
607 Diphenylamine-d10..................... 42 27-206 11-488 59-169 21-249
708 Diphenyl ether (Appendix C)........... 19 82-136 .............. 83-120 77-144
608 Diphenyl ether-d10.................... 37 36-155 19-281 77-129 29-186
337 1,2-diphenylhydrazine................. 73 49-308 .............. 75-134 40-360
237 1,2-diphenylhydrazine-d10............. 35 31-173 17-316 58-174 26-200
339 Fluoranthene.......................... 33 71-177 .............. 67-149 64-194
239 Fluoranthene-d10...................... 35 36-161 20-278 47-215 30-187
380 Fluorene.............................. 29 81-132 .............. 74-135 70-151
280 Fluorene-d10.......................... 43 51-131 27-238 61-164 38-172
309 Hexachlorobenzene..................... 16 90-124 .............. 78-128 85-132
209 Hexachlorobenzene-13C6................ 81 36-228 13-595 38-265 23-321
352 hexachlorobutadiene................... 56 51-251 .............. 74-135 43-287
252 hexachlorobutadiene-13C4.............. 63 ns-316 ns-ns 68-148 ns-413
312 hexachloroethane...................... 227 21-ns .............. 71-141 13-ns
212 hexachloroethane-13C1................. 77 ns-400 ns-ns 47-212 ns-563
353 hexachlorocyclopentadiene............. 15 69-144 .............. 77-129 67-148
253 hexachlorocyclopentadiene-13C4........ 60 ns-ns ns-ns 47-211 ns-ns
083 ideno(1,2,3-cd)pyrene*................ 55 23-299 .............. 13-761 19-340
354 isophorone............................ 25 76-156 .............. 70-142 70-168
254 isophorone-d8......................... 23 49-133 33-193 52-194 44-147
360 2-methyl-4,6-dinitrophenol............ 19 77-133 .............. 69-145 72-142
260 2-methyl-4,6-dinitrophenol-d2......... 64 36-247 16-527 56-177 28-307
355 naphthalene........................... 20 80-139 .............. 73-137 75-149
255 naphthalene-d8........................ 39 28-157 14-305 71-141 22-192
702 B-naphthylamine (Appendix C).......... 49 10-ns .............. 39-256 ns-ns
602 B-naphthylamine-d7.................... 33 ns-ns ns-ns 44-230 ns-ns
356 nitrobenzene.......................... 25 69-161 .............. 85-115 65-169
256 nitrobenzene-d5....................... 28 18-265 ns-ns 46-219 15-314
357 2-nitrophenol......................... 15 78-140 .............. 77-129 75-145
257 2-nitrophenol-d4...................... 23 41-145 27-217 61-163 37-158
358 4-nitrophenol......................... 42 62-146 .............. 55-183 51-175
258 4-nitrophenol-d4...................... 188 14-398 ns-ns 35-287 ns-ns
061 N-nitrosodimethylamile*............... 198 21-472 .............. 40-249 12-807
063 N-nitrosodi-n-proplyamine*............ 198 21-472 .............. 40-249 12-807
362 N-nitrosodiphenylamine................ 45 65-142 .............. 68-148 53-173
262 N-nitrosodiphenylamine-d6............. 37 54-126 26-256 59-170 40-166
364 pentachlorophenol..................... 21 76-140 .............. 77-130 71-150
264 pentachlorophenol-13C6................ 49 37-212 18-412 42-237 29-254
381 phenanthrene.......................... 13 93-119 .............. 75-133 87-126
281 phenanthrene-d10...................... 40 45-130 24-241 67-149 34-168
365 phenol................................ 36 77-127 .............. 65-155 62-154
265 phenol-d5............................. 161 21-210 ns-ns 48-208 ns-ns
703 a-picoline (Synfuel).................. 38 59-149 .............. 60-165 50-174
603 a-picoline-d7......................... 138 11-380 ns-ns 31-324 ns-608
384 pyrene................................ 19 76-152 .............. 76-132 72-159
284 pyrene-d10............................ 29 32-176 18-303 48-210 28-196
710 styrene (Appendix C).................. 42 53-221 .............. 65-153 48-244
[[Page 337]]
610 styrene-d5............................ 49 ns-281 ns-ns 44-228 ns-348
709 a-terpineol (Appendix C).............. 44 42-234 .............. 54-186 38-258
609 a-terpineol-d3........................ 48 22-292 ns-672 20-502 18-339
529 1,2,3-trichlorobenzene (4c)*.......... 69 15-229 .............. 60-167 11-297
308 1,2,4-trichlorobenzene................ 19 82-136 .............. 78-128 77-144
208 1,2,4-trichlorobenzene-d3............. 57 15-212 ns-592 61-163 10-282
530 2,3,6-trichlorophenol (4c)*........... 30 58-137 .............. 56-180 51-153
531 2,4,5-trichlorophenol (4c)*........... 30 58-137 .............. 56-180 51-153
321 2,4,6-trichlorophenol................. 57 59-205 .............. 81-123 48-244
221 2,4,6-trichlorophenol-d2.............. 47 43-183 21-363 69-144 34-226
----------------------------------------------------------------------------------------------------------------
\1\ Reference numbers beginning with 0, 1 or 5 indicate a pollutant quantified by the internal standard method;
reference numbers beginning with 2 or 6 indicate a labeled compound quantified by the internal standard
method; reference numbers beginning with 3 or 7 indicate a pollutant quantified by isotope dilution.
* Measured by internal standard; specification derived from related compound.
ns=no specification; limit is outside the range that can be measured reliably.
[[Page 338]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.057
[[Page 339]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.058
[[Page 340]]
[GRAPHIC] [TIFF OMITTED] TC02JY92.059
[[Page 341]]
Attachment 1 to Method 1625
Introduction
To support measurement of several semivolatile pollutants, EPA has
developed this attachment to EPA Method 1625B. \1\ The modifications
listed in this attachment are approved only for monitoring wastestreams
from the Centralized Waste Treatment Point Source Category (40 CFR part
437) and the Landfills Point Source Category (40 CFR part 445). EPA
Method 1625B (the Method) employs sample extraction with methylene
chloride followed by analysis of the extract using capillary column gas
chromatography-mass spectrometry (GC/MS). This attachment addresses the
addition of the semivolatile pollutants listed in Tables 1 and 2 to all
applicable standard, stock, and spiking solutions utilized for the
determination of semivolatile organic compounds by EPA Method 1625B.
---------------------------------------------------------------------------
\1\ EPA Method 1625 Revision B, Semivolatile Organic Compounds by
Isotope Dilution GC/MS, 40 CFR part 136, appendix A.
---------------------------------------------------------------------------
1.0 EPA METHOD 1625 REVISION B MODIFICATION SUMMARY
The additional semivolatile organic compounds listed in Tables 1 and
2 are added to all applicable calibration, spiking, and other solutions
utilized in the determination of semivolatile compounds by EPA Method
1625. The instrument is to be calibrated with these compounds, and all
procedures and quality control tests described in the Method must be
performed.
2.0 SECTION MODIFICATIONS
Note: All section and figure numbers in this Attachment reference
section and figure numbers in EPA Method 1625 Revision B unless noted
otherwise. Sections not listed here remain unchanged.
Section 6.7 The stock standard solutions described in this section are
modified such that the analytes in Tables 1 and 2 of this
attachment are required in addition to those specified in the
Method.
Section 6.8 The labeled compound spiking solution in this section is
modified to include the labeled compounds listed in Tables 5
and 6 of this attachment.
Section 6.9 The secondary standard is modified to include the additional
analytes listed in Tables 1 and 2 of this attachment.
Section 6.12 The solutions for obtaining authentic mass spectra are to
include all additional analytes listed in Tables 1 and 2 of
this attachment.
Section 6.13 The calibration solutions are modified to include the
analytes listed in Tables 1 and 2 and the labeled compounds
listed in Tables 5 and 6 of this attachment.
Section 6.14 The precision and recovery standard is modified to include
the analytes listed in Tables 1 and 2 and the labeled
compounds listed in Tables 5 and 6 of this attachment.
Section 6.15 The solutions containing the additional analytes listed in
Tables 1 and 2 of this attachment are to be analyzed for
stability.
Section 7.2.1 This section is modified to include the analytes listed in
Tables 1 and 2 and the labeled compounds listed in Tables 5
and 6 of this attachment.
Section 7.4.5 This section is modified to include the analytes listed in
Tables 1 and 2 and the labeled compounds listed in Tables 5
and 6 in the calibration.
Section 8.2 The initial precision and recovery (IPR) requirements are
modified to include the analytes listed in Tables 1 and 2 and
the labeled compounds listed in Tables 5 and 6 of this
attachment. Additional IPR performance criteria are supplied
in Table 7 of this attachment.
Section 8.3 The labeled compounds listed in Tables 3 and 4 of this
attachment are to be included in the method performance tests.
Additional method performance criteria are supplied in Table 7
of this attachment.
Section 8.5.2 The acceptance criteria for blanks includes the analytes
listed in Tables 1 and 2 of this attachment.
Section 10.1.2 The labeled compound solution must include the labeled
compounds listed in Tables 5 and 6 of this attachment.
Section 10.1.3 The precision and recovery standard must include the
analytes listed in Tables 1 and 2 and the labeled compounds
listed in Tables 5 and 6 of this attachment.
Section 12.5 Additional QC requirements for calibration verification are
supplied in Table 7 of this attachment.
Section 12.7 Additional QC requirements for ongoing precision and
recovery are supplied in Table 7 of this attachment.
[[Page 342]]
Table 1--Base/Neutral Extractable Compounds
------------------------------------------------------------------------
Pollutant
-----------------------
Compound CAS
Registry EPA-EGD
------------------------------------------------------------------------
acetophenone \1\................................ 98-86-2 758
aniline \2\..................................... 62-53-3 757
-2,3-dichloroaniline \1\........................ 608-27-5 578
-o-cresol \1\................................... 95-48-7 771
pyridine \2\.................................... 110-86-1 1330
------------------------------------------------------------------------
CAS = Chemical Abstracts Registry.
EGD = Effluent Guidelines Division.
\1\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment industry.
\2\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
Table 2--Acid Extractable Compounds
------------------------------------------------------------------------
Pollutant
-------------------------
Compound CAS
Registry EPA-EGD
------------------------------------------------------------------------
p-cresol \1\.................................. 106-44-5 1744
------------------------------------------------------------------------
CAS = Chemical Abstracts Registry.
EGD = Effluent Guidelines Division.
\1\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
Table 3--Gas Chromatography \1\ of Base/Neutral Extractable Compounds
--------------------------------------------------------------------------------------------------------------------------------------------------------
Retention time \2\ Retention time \2\
------------------------------------------------ Minimum level EGD ----------------------
EGD No. Compound \3\ ([micro]g/ No. Compound Mean EGD
Mean (sec) EGD Ref Relative L) (sec) Ref Relative
------------------------------------------------------------------------------------------------------------------- -------------------------------------------------
758...................... acetophenone \4\........ 818 658 1.003-1.005 10
757...................... aniline \5\............. 694 657 0.994-1.023 10
578...................... 2,3-dichloroaniline \4\. 1160 164 1.003-1.007 10
771...................... o-cresol \4\............ 814 671 1.005-1.009 10
1330..................... pyridine \5\............ 378 1230 1.005-1.011 10
--------------------------------------------------------------------------------------------------------------------------------------------------------
EGD = Effluent Guidelines Division.
\1\ The data presented in this table were obtained under the chromatographic conditions given in the footnote to Table 3 of EPA Method 1625B.
\2\ Retention times are approximate and are intended to be consistent with the retention times for the analytes in EPA Method 1625B.
\3\ See the definition in footnote 2 to Table 3 of EPA Method 1625B.
\4\ Analysis of this pollutant is approved only for the Centralized Waste Treatment industry.
\5\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
Table 4--Gas Chromatography \1\ of Acid Extractable Compounds
----------------------------------------------------------------------------------------------------------------
Retention time \2\ Minimum level
EGD No. Compound ------------------------------------------------ ([micro]/L)
Mean (sec) EGD Ref Relative \3\
----------------------------------------------------------------------------------------------------------------
1744.................... p-cresol \4\.......... 834 1644 1.004-1.008 20
----------------------------------------------------------------------------------------------------------------
EGD = Effluent Guidelines Division.
\1\ The data presented in this table were obtained under the chromatographic conditions given in the footnote to
Table 4 of EPA Method 1625B.
\2\ Retention times are approximate and are intended to be consistent with the retention times for the analytes
in EPA Method 1625B.
\3\ See the definition in footnote 2 to Table 4 of EPA Method 1625B.
\4\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
Table 5--Base/Neutral Extractable Compound Characteristic m/z's
------------------------------------------------------------------------
Primary m/
Compound Labeled Analog z \1\
------------------------------------------------------------------------
acetophenone \2\.......................... d5 105/110
aniline \3\............................... d7 93/100
o-cresol \2\.............................. d7 108/116
2,3-dichloroaniline \2\................... n/a 161
pyridine \3\.............................. d5 79/84
------------------------------------------------------------------------
m/z = mass to charge ratio.
[[Page 343]]
\1\ Native/labeled.
\2\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment industry.
\3\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
Table 6--Acid Extractable Compound Characteristic m/z's
------------------------------------------------------------------------
Primary m/
Compound Labeled Analog z \1\
------------------------------------------------------------------------
p-cresol \2\.............................. d7 108/116
------------------------------------------------------------------------
m/z = mass to charge ratio.
\1\ Native/labeled.
\2\ Analysis of this pollutant is approved only for the Centralized
Waste Treatment and Landfills industries.
Table 7--Acceptance Criteria for Performance Tests
----------------------------------------------------------------------------------------------------------------
Acceptance criteria
---------------------------------------
Initial precision and On-going
accuracy section 8.2 Labeled Calibration accuracy
EGD No. Compound ([micro]g/L) compound verification sec. 12.7 R
-------------------------- recovery sec. 12.5 ([micro]g/
s sec. 8.3 [micro]g/mL) L)
([micro]g/ X and 14.2 P
L) (percent)
----------------------------------------------------------------------------------------------------------------
758.................... acetophenone \1\..... 34 44-167 ........... 85-115 45-162
658.................... acetophenone-d 5 \1\. 51 23-254 45-162 85-115 22-264
757.................... aniline \2\.......... 32 30-171 ........... 85-115 33-154
657.................... aniline-d 7 \2\...... 71 15-278 33-154 85-115 12-344
771.................... o-cresol \1\......... 40 31-226 ........... 85-115 35-196
671.................... o-cresol-d 7 \1\..... 23 30-146 35-196 85-115 31-142
1744................... p-cresol \2\......... 59 54-140 ........... 85-115 37-203
1644................... p-cresol-d7 \2\...... 22 11-618 37-203 85-115 16-415
578.................... 2,3-dichloroaniline 13 40-160 ........... 85-115 44-144
\1\.
1330................... pyridine \2\......... 28 10-421 ........... 83-117 18-238
1230................... pyridine-d 5 \2\..... ns 7-392 19-238 85-115 4-621
----------------------------------------------------------------------------------------------------------------
s = Standard deviation of four recovery measurements.
X = Average recovery for four recovery measurements.
EGD = Effluent Guidelines Division.
ns = no specification; limit is outside the range that can be measured reliably.
\1\ Analysis of this pollutant is approved only for the Centralized Waste Treatment industry.
\2\ Analysis of this pollutant is approved only for the Centralized Waste Treatment and Landfills industries.
[49 FR 43261, Oct. 26, 1984; 50 FR 692, 695, Jan. 4, 1985, as amended at
51 FR 23702, June 30, 1986; 62 FR 48405, Sept. 15, 1997; 65 FR 3044,
Jan. 19, 2000; 65 FR 81295, 81298, Dec. 22, 2000]
Sec. Appendix B to Part 136--Definition and Procedure for the
Determination of the Method Detection Limit--Revision 1.11
Definition
The method detection limit (MDL) is defined as the minimum
concentration of a substance that can be measured and reported with 99%
confidence that the analyte concentration is greater than zero and is
determined from analysis of a sample in a given matrix containing the
analyte.
Scope and Application
This procedure is designed for applicability to a wide variety of
sample types ranging from reagent (blank) water containing analyte to
wastewater containing analyte. The MDL for an analytical procedure may
vary as a function of sample type. The procedure requires a complete,
specific, and well defined analytical method. It is essential that all
sample processing steps of the analytical method be included in the
determination of the method detection limit.
The MDL obtained by this procedure is used to judge the significance
of a single measurement of a future sample.
The MDL procedure was designed for applicability to a broad variety
of physical and chemical methods. To accomplish this, the procedure was
made device- or instrument-independent.
Procedure
1. Make an estimate of the detection limit using one of the
following:
(a) The concentration value that corresponds to an instrument
signal/noise in the range of 2.5 to 5.
(b) The concentration equivalent of three times the standard
deviation of replicate instrumental measurements of the analyte in
reagent water.
(c) That region of the standard curve where there is a significant
change in sensitivity, i.e., a break in the slope of the standard curve.
[[Page 344]]
(d) Instrumental limitations.
It is recognized that the experience of the analyst is important to
this process. However, the analyst must include the above considerations
in the initial estimate of the detection limit.
2. Prepare reagent (blank) water that is as free of analyte as
possible. Reagent or interference free water is defined as a water
sample in which analyte and interferent concentrations are not detected
at the method detection limit of each analyte of interest. Interferences
are defined as systematic errors in the measured analytical signal of an
established procedure caused by the presence of interfering species
(interferent). The interferent concentration is presupposed to be
normally distributed in representative samples of a given matrix.
3. (a) If the MDL is to be determined in reagent (blank) water,
prepare a laboratory standard (analyte in reagent water) at a
concentration which is at least equal to or in the same concentration
range as the estimated method detection limit. (Recommend between 1 and
5 times the estimated method detection limit.) Proceed to Step 4.
(b) If the MDL is to be determined in another sample matrix, analyze
the sample. If the measured level of the analyte is in the recommended
range of one to five times the estimated detection limit, proceed to
Step 4.
If the measured level of analyte is less than the estimated
detection limit, add a known amount of analyte to bring the level of
analyte between one and five times the estimated detection limit.
If the measured level of analyte is greater than five times the
estimated detection limit, there are two options.
(1) Obtain another sample with a lower level of analyte in the same
matrix if possible.
(2) The sample may be used as is for determining the method
detection limit if the analyte level does not exceed 10 times the MDL of
the analyte in reagent water. The variance of the analytical method
changes as the analyte concentration increases from the MDL, hence the
MDL determined under these circumstances may not truly reflect method
variance at lower analyte concentrations.
4. (a) Take a minimum of seven aliquots of the sample to be used to
calculate the method detection limit and process each through the entire
analytical method. Make all computations according to the defined method
with final results in the method reporting units. If a blank measurement
is required to calculate the measured level of analyte, obtain a
separate blank measurement for each sample aliquot analyzed. The average
blank measurement is subtracted from the respective sample measurements.
(b) It may be economically and technically desirable to evaluate the
estimated method detection limit before proceeding with 4a. This will:
(1) Prevent repeating this entire procedure when the costs of analyses
are high and (2) insure that the procedure is being conducted at the
correct concentration. It is quite possible that an inflated MDL will be
calculated from data obtained at many times the real MDL even though the
level of analyte is less than five times the calculated method detection
limit. To insure that the estimate of the method detection limit is a
good estimate, it is necessary to determine that a lower concentration
of analyte will not result in a significantly lower method detection
limit. Take two aliquots of the sample to be used to calculate the
method detection limit and process each through the entire method,
including blank measurements as described above in 4a. Evaluate these
data:
(1) If these measurements indicate the sample is in desirable range
for determination of the MDL, take five additional aliquots and proceed.
Use all seven measurements for calculation of the MDL.
(2) If these measurements indicate the sample is not in correct
range, reestimate the MDL, obtain new sample as in 3 and repeat either
4a or 4b.
5. Calculate the variance (S\2\) and standard deviation (S) of the
replicate measurements, as follows:
[GRAPHIC] [TIFF OMITTED] TC15NO91.208
where:
X[iota]; i=1 to n, are the analytical results in the final method
reporting units obtained from
[[Page 345]]
the n sample aliquots and [Sigma] refers to the sum of the X values from
i=l to n.
6. (a) Compute the MDL as follows:
MDL = t(n-1,1-[alpha]=0.99) (S)
where:
MDL = the method detection limit
t(n-1,1-[alpha]=.99) = the students' t value appropriate for
a 99% confidence level and a standard deviation estimate with n-1
degrees of freedom. See Table.
S = standard deviation of the replicate analyses.
(b) The 95% confidence interval estimates for the MDL derived in 6a
are computed according to the following equations derived from
percentiles of the chi square over degrees of freedom distribution
([chi]\2\/df).
LCL = 0.64 MDL
UCL = 2.20 MDL
where: LCL and UCL are the lower and upper 95% confidence limits
respectively based on seven aliquots.
7. Optional iterative procedure to verify the reasonableness of the
estimate of the MDL and subsequent MDL determinations.
(a) If this is the initial attempt to compute MDL based on the
estimate of MDL formulated in Step 1, take the MDL as calculated in Step
6, spike the matrix at this calculated MDL and proceed through the
procedure starting with Step 4.
(b) If this is the second or later iteration of the MDL calculation,
use S\2\ from the current MDL calculation and S\2\ from the previous MDL
calculation to compute the F-ratio. The F-ratio is calculated by
substituting the larger S\2\ into the numerator S\2\A and the
other into the denominator S\2\B. The computed F-ratio is
then compared with the F-ratio found in the table which is 3.05 as
follows: if S\2\A/S\2\B<3.05, then compute the
pooled standard deviation by the following equation:
[GRAPHIC] [TIFF OMITTED] TC15NO91.209
if S\2\A/S\2\B3.05, respike at the
most recent calculated MDL and process the samples through the procedure
starting with Step 4. If the most recent calculated MDL does not permit
qualitative identification when samples are spiked at that level, report
the MDL as a concentration between the current and previous MDL which
permits qualitative identification.
(c) Use the Spooled as calculated in 7b to compute The
final MDL according to the following equation:
MDL=2.681 (Spooled)
where 2.681 is equal to t(12,1-[alpha]=.99).
(d) The 95% confidence limits for MDL derived in 7c are computed
according to the following equations derived from precentiles of the chi
squared over degrees of freedom distribution.
LCL=0.72 MDL
UCL=1.65 MDL
where LCL and UCL are the lower and upper 95% confidence limits
respectively based on 14 aliquots.
Tables of Students' t Values at the 99 Percent Confidence Level
------------------------------------------------------------------------
Degrees
of
Number of replicates freedom tcn-1,.99)
(n-1)
------------------------------------------------------------------------
7............................................... 6 3.143
8............................................... 7 2.998
9............................................... 8 2.896
10.............................................. 9 2.821
11.............................................. 10 2.764
16.............................................. 15 2.602
21.............................................. 20 2.528
26.............................................. 25 2.485
31.............................................. 30 2.457
61.............................................. 60 2.390
00.............................................. 00 2.326
------------------------------------------------------------------------
Reporting
The analytical method used must be specifically identified by number
or title ald the MDL for each analyte expressed in the appropriate
method reporting units. If the analytical method permits options which
affect the method detection limit, these conditions must be specified
with the MDL value. The sample matrix used to determine the MDL must
also be identified with MDL value. Report the mean analyte level with
the MDL and indicate if the MDL procedure was iterated. If a laboratory
standard or a sample that contained a known amount analyte was used for
this determination, also report the mean recovery.
[[Page 346]]
If the level of analyte in the sample was below the determined MDL
or exceeds 10 times the MDL of the analyte in reagent water, do not
report a value for the MDL.
[49 FR 43430, Oct. 26, 1984; 50 FR 694, 696, Jan. 4, 1985, as amended at
51 FR 23703, June 30, 1986]
Sec. Appendix C to Part 136--Inductively Coupled Plasma--Atomic Emission
Spectrometric Method for Trace Element Analysis of Water and Wastes
Method 200.7
1. Scope and Application
1.1 This method may be used for the determination of dissolved,
suspended, or total elements in drinking water, surface water, and
domestic and industrial wastewaters.
1.2 Dissolved elements are determined in filtered and acidified
samples. Appropriate steps must be taken in all analyses to ensure that
potential interferences are taken into account. This is especially true
when dissolved solids exceed 1500 mg/L. (See Section 5.)
1.3 Total elements are determined after appropriate digestion
procedures are performed. Since digestion techniques increase the
dissolved solids content of the samples, appropriate steps must be taken
to correct for potential interference effects. (See Section 5.)
1.4 Table 1 lists elements for which this method applies along with
recommended wavelengths and typical estimated instrumental detection
limits using conventional pneumatic nebulization. Actual working
detection limits are sample dependent and as the sample matrix varies,
these concentrations may also vary. In time, other elements may be added
as more information becomes available and as required.
1.5 Because of the differences between various makes and models of
satisfactory instruments, no detailed instrumental operating
instructions can be provided. Instead, the analyst is referred to the
instruction provided by the manufacturer of the particular instrument.
2. Summary of Method
2.1 The method describes a technique for the simultaneous or
sequential multielement determination of trace elements in solution. The
basis of the method is the measurement of atomic emission by an optical
spectroscopic technique. Samples are nebulized and the aerosol that is
produced is transported to the plasma torch where excitation occurs.
Characteristic atomic-line emission spectra are produced by a radio-
frequency inductively coupled plasma (ICP). The spectra are dispersed by
a grating spectrometer and the intensities of the lines are monitored by
photomultiplier tubes. The photocurrents from the photomultiplier tubes
are processed and controlled by a computer system. A background
correction technique is required to compensate for variable background
contribution to the determination of trace elements. Background must be
measured adjacent to analyte lines on samples during analysis. The
position selected for the background intensity measurement, on either or
both sides of the analytical line, will be determined by the complexity
of the spectrum adjacent to the analyte line. The position used must be
free of spectral interference and reflect the same change in background
intensity as occurs at the analyte wavelength measured. Background
correction is not required in cases of line broadening where a
background correction measurement would actually degrade the analytical
result. The possibility of additional interferences named in 5.1 (and
tests for their presence as described in 5.2) should also be recognized
and appropriate corrections made.
3. Definitions
3.1 Dissolved--Those elements which will pass through a 0.45
[micro]m membrane filter.
3.2 Suspended--Those elements which are retained by a 0.45 [micro]m
membrane filter.
3.3 Total--The concentration determined on an unfiltered sample
following vigorous digestion (Section 9.3), or the sum of the dissolved
plus suspended concentrations. (Section 9.1 plus 9.2).
3.4 Total recoverable--The concentration determined on an unfiltered
sample following treatment with hot, dilute mineral acid (Section 9.4).
3.5 Instrumental detection limit--The concentration equivalent to a
signal, due to the analyte, which is equal to three times the standard
deviation of a series of ten replicate measurements of a reagent blank
signal at the same wavelength.
3.6 Sensitivity--The slope of the analytical curve, i.e., functional
relationship between emission intensity and concentration.
3.7 Instrument check standard--A multielement standard of known
concentrations prepared by the analyst to monitor and verify instrument
performance on a daily basis. (See 7.6.1)
3.8 Interference check sample--A solution containing both
interfering and analyte elemelts of known concentration that can be used
to verify background and interelement correction factors. (See 7.6.2.)
3.9 Quality control sample--A solution obtained from an outside
source having known, concentration values to be used to verify the
calibration standards. (See 7.6.3)
3.10 Calibration standards--A series of known standard solutions
used by the analyst for calibration of the instrument (i.e., preparation
of the analytical curve). (See 7.4)
[[Page 347]]
3.11 Linear dynamic range--The concentration range over which the
analytical curve remains linear.
3.12 Reagent blank--A volume of deionized, distilled water
containing the same acid matrix as the calibration standards carried
through the entire analytical scheme. (See 7.5.2)
3.13 Calibration blank--A volume of deionized, distilled water
acidified with HNO3 and HCl. (See 7.5.1)
3.14 Methmd of standard addition-- The standard addition technique
involves the use of the unknown and the unknown plus a known amount of
standard. (See 10.6.1.)
4. Safety
4.1 The toxicity of carcinogenicity of each reagent used in this
method has not been precisely defined; however, each chemical compound
should be treated as a potential health hazard. From this viewpoint,
exposure to these chemicals must be reduced to the lowest possible level
by whatever means available. The laboratory is repsonsible for
maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this method. A reference
file of material data handling sheets should also be made available to
all personnel involved in the chemical analysis. Additional references
to laboratory safety are available and have been identified \(14.7,14.8
and 14.9)\ for the information of the analyst.
5. Interferences
5.1 Several types of interference effects may contribute to
inaccuracies in the determination of trace elements. They can be
summarized as follows:
5.1.1 Spectral interferences can be categorized as (1) overlap of a
spectral line from another element; (2) unresolved overlap of molecular
band spectra; (3) background contribution from continuous or
recombination phenomena; and (4) background contribution from stray
light from the line emission of high concentration elements. The first
of these effects can be compensated by utilizing a computer correction
of the raw data, requiring the monitoring and measurement of the
interfering element. The second effect may require selection of an
alternate wavelength. The third and fourth effects can usually be
compensated by a background correction adjacent to the analyte line. In
addition, users of simultaneous multi-element instrumentation must
assume the responsibility of verifying the absence of spectral
interference from an element that could occur in a sample but for which
there is no channel in the instrument array. Listed in Table 2 are some
interference effects for the recommended wavelengths given in Table 1.
The data in Table 2 are intended for use only as a rudimentary guide for
the indication of potential spectral interferences. For this purpose,
linear relations between concentration and intensity for the analytes
and the interferents can be assumed. The Interference information, which
was collected at the Ames Laboratory, \1\ is expressed as analyte
concentration equivalents (i.e., false analyte concentrations) arising
from 100 mg/L of the interferent element. The suggested use of this
information is as follows: Assume that arsenic (at 193.696 nm) is to be
determined in a sample containing approximately 10 mg/L of aluminum.
According to Table 2, 100 mg/L of aluminum would yield a false signal
for arsenic equivalent to approximately 1.3 mg/L. Therefore, 10 mg/L of
aluminum would result in a false signal for arsenic equivalent to
approximately 0.13 mg/L. The reader is cautioned that other analytical
systems may exhibit somewhat different levels of interference than those
shown in Table 2, and that the interference effects must be evaluated
for each individual system.
---------------------------------------------------------------------------
\1\ Ames Laboratory, USDOE, Iowa State University, Ames Iowa 50011.
---------------------------------------------------------------------------
Only those interferents listed were investigated and the blank
spaces in Table 2 indicate that measurable interferences were not
observed for the interferent concentrations listed in Table 3.
Generally, interferences were discernible if they produced peaks or
background shifts corresponding to 2-5% of the peaks generated by the
analyte concentrations also listed in Table 3.
At present, information on the listed silver and potassium
wavelengths are not available but it has been reported that second order
energy from the magnesium 383.231 nm wavelength interferes with the
listed potassium line at 766.491 nm.
5.1.2 Physical interferences are generally considered to be effects
associated with the sample nebulization and transport processes. Such
properties as change in viscosity and surface tension can cause
significant inaccuracies especially in samples which may contain high
dissolved solids and/or acid concentrations. The use of a peristaltic
pump may lessen these interferences. If these types of interferences are
operative, they must be reduced by dilution of the sample and/or
utilization of standard addition techniques. Another problem which can
occur from high dissolved solids is salt buildup at the tip of the
nebulizer. This affects aersol flow rate causing instrumental drift.
Wetting the argon prior to nebulization, the use of a tip washer, or
sample dilution have been used to control this problem. Also, it has
been reported that better control of the argon flow rate improves
instrument performance. This is accomplished with the use of mass flow
controllers.
[[Page 348]]
5.1.3 Chemical Interferences are characterized by molecular compound
formation, ionization effects and solute vaporization effects. Normally
these effects are not pronounced with the ICP technique, however, if
observed they can be minimized by careful selection of operating
conditions (that is, incident power, observation position, and so
forth), by buffering of the sample, by matrix matching, and by standard
addition procedures. These types of interferences can be highly
dependent on matrix type and the specific analyte element.
5.2 It is recommended that whenever a new or unusual sample matrix
is encountered, a series of tests be performed prior to reporting
concentration data for analyte elements. These tests, as outlined in
5.2.1 through 5.2.4, will ensure the analyst that neither positive nor
negative interference effects are operative on any of the analyte
elements thereby distorting the accuracy of the reported values.
5.2.1 Serial dilution. If the analyte concentration is sufficiently
high (minimally a factor of 10 above the instrumental detection limit
after dilution), an analysis of a dilution should agree within 5 percent
of the original determination (or within some acceptable control limit
(14.3) that has been established for that matrix.). If not, a chemical
or physical interference effect should be suspected.
5.2.2 Spike addition. The recovery of a spike addition added at a
minimum level of 10X the instrumental detection limit (maximum 100X) to
the original determination should be recovered to within 90 to 110
percent or within the established control limit for that matrix. If not,
a matrix effect should be suspected. The use of a standard addition
analysis procedure can usually compensate for this effect.
Caution: The standard addition technique does not detect coincident
spectral overlap. If suspected, use of computerized compensation, an
alternate wavelength, or comparison with an alternate method is
recommended (See 5.2.3).
5.2.3 Comparison with alternate method of analysis. When
investigating a new sample matrix, comparison tests may be performed
with other analytical techniques such as atomic absorption spectrometry,
or other approved methodology.
5.2.4 Wavelength scanning of analyte line region. If the appropriate
equipment is available, wavelength scanning can be performed to detect
potential spectral interferences.
6. Apparatus
6.1 Inductively Coupled Plasma-Atomic Emission Spectrometer.
6.1.1 Computer controlled atomic emission spectrometer with
background correction.
6.1.2 Radiofrequency generator.
6.1.3 Argon gas supply, welding grade or better.
6.2 Operating conditions--Because of the differences between various
makes and models of satisfactory instruments, no detailed operating
instructions can be provided. Instead, the analyst should follow the
instructions provided by the manufacturer of the particular instrument.
Sensitivity, instrumental detection limit, precision, linear dynamic
range, and interference effects must be investigated and established for
each individual analyte line on that particular instrument. It is the
responsibility of the analyst to verify that the instrument
configuration and operating conditions used satisfy the analytical
requirements and to maintain quality control data confirming instrument
performance and analytical results.
7. Reagents and Standards
7.1 Acids used in the preparation of standards and for sample
processing must be ultra-high purity grade or equivalent. Redistilled
acids are acceptable.
7.1.1 Acetic acid, conc. (sp gr 1.06).
7.1.2 Hydrochloric acid, conc. (sp gr 1.19).
7.1.3 Hydrochloric acid, (1+1): Add 500 mL conc. HCl (sp gr 1.19) to
400 mL deionized, distilled water and dilute to 1 liter.
7.1.4 Nitric acid, conc. (sp gr 1.41).
7.1.5 Nitric acid, (1+1): Add 500 mL conc. HNO3 (sp gr
1.41) to 400 mL deionized, distilled water and dilute to 1 liter.
7.2 Deionized, distilled water: Prepare by passing distilled water
through a mixed bed of cation and anion exchange resins. Use deionized,
distilled water for the preparation of all reagents, calibration
standards and as dilution water. The purity of this water must be
equivalent to ASTM Type II reagent water of Specification D 1193 (14.6).
7.3 Standard stock solutions may be purchased or prepared from ultra
high purity grade chemicals or metals. All salts must be dried for 1 h
at 105 [deg]C unless otherwise specified.
(CAUTION: Many metal salts are extremely toxic and may be fatal if
swallowed. Wash hands thoroughly after handling.)
Typical stock solution preparation procedures follow:
7.3.1 Aluminum solution, stock, 1 mL=100[micro]g Al: Dissolve 0.100
g of aluminum metal in an acid mixture of 4 mL of (1+1) HCl and 1 mL of
conc. HNO3 in a beaker. Warm gently to effect solution. When
solution is complete, transfer quantitatively to a liter flask add an
additional 10 mL of (1+1) HCl and dilute to 1,000 mL with deionized,
distilled water.
7.3.2 Antimony solution stock, 1 mL=100 [micro]g Sb: Dissolve 0.2669
g K(SbO)C4H4O6 in deionized distilled
water, add 10 mL (1+1) HCl and dilute to 1,000 mL with deionized,
distilled water.
[[Page 349]]
7.3.3 Arsenic solution, stock, 1 mL=100 [micro]g As: Dissolve 0.1320
g of As2O3 in 100 mL of deionized, distilled water
containing 0.4 g NaOH. Acidify the solution with 2 mL conc.
HNO3 and dilute to 1,000 mL with deionized, distilled water.
7.3.4 Barium solution, stock, 1 mL=100 [micro]g Ba: Dissolve 0.1516
g BaCl2 (dried at 250 [deg]C for 2 hrs) in 10 mL deionized,
distilled water with 1 mL (1+1) HCl. Add 10.0 mL (1+1) HCl and dilute to
1,000 with mL deionized, distilled water.
7.3.5 Beryllium solution, stock, 1 mL=100 [micro]g Be: Do not dry.
Dissolve 1.966 g BeSO4[middot]4H2O, in deionized,
distilled water, add 10.0 mL conc. HNO3 and dilute to 1,000
mL with deionized, distilled water.
7.3.6 Boron solution, stock, 1 mL=100[micro]g B: Do not dry.
Dissolve 0.5716 g anhydrous H3BO3 in deionized,
distilled water and dilute to 1,000 mL. Use a reagent meeting ACS
specifications, keep the bottle tightly stoppered and store in a
desiccator to prevent the entrance of atmospheric moisture.
7.3.7 Cadmium solution, stock, 1 mL=100 [micro]g Cd: Dissolve 0.1142
g CdO in a minimum amount of (1+1) HNO3. Heat to increase
rate of dissolution. Add 10.0 mL conc. HNO3 and dilute to
1,000 mL with deionized, distilled water.
7.3.8 Calcium solution, stock, 1 mL=100 [micro]g Ca: Suspend 0.2498
g CaCO3 dried at 180 [deg]C for 1 h before weighing in
deionized, distilled water and dissolve cautiously with a minimum amount
of (1+1) HNO3. Add 10.0 mL conc. HNO3 and dilute
to 1,000 mL with deionized, distilled water.
7.3.9 Chromium solution, stock, 1 mL=100 [micro]g Cr: Dissolve
0.1923 g of CrO3 in deionized, distilled water. When solution
is complete, acidify with 10 mL conc. HNO3 and dilute to
1,000 mL with deionized, distilled water.
7.3.10 Cobalt solution, stock, 1 mL=100 [micro]g Co: Dissolve 0.1000
g of cobalt metal in a minimum amount of (1+1) HNO3. Add 10.0
mL (1+1) HCl and dilute to 1,000 mL with deionized, distilled water.
7.3.11 Copper solution, stock, 1 mL=100 [micro]g Cu: Dissolve 0.1252
g CuO in a minimum amount of (1+1) HNO3. Add 10.0 mL conc.
HNO3 and dilute to 1,000 mL with deionized, distilled water.
7.3.12 Iron solution, stock, 1 mL=100 [micro]g Fe: Dissolve 0.1430 g
Fe2O3 in a warm mixture of 20 mL (1+1) HCl and 2
mL of conc. HNO3. Cool, add an additional 5 mL of conc.
HNO3 and dilute to 1,000 mL with deionized, distilled water.
7.3.13 Lead solution, stock, 1 mL=100 [micro]g Pb: Dissolve 0.1599 g
Pb(NO3)2 in a minimum amount of (1+1)
HNO3. Add 10.0 mL conc. HNO3 and dilute to 1,000
mL with deionized, distilled water.
7.3.14 Magnesium solution, stock, 1 mL=100 [micro]g Mg: Dissolve
0.1658 g MgO in a minimum amount of (1+1) HNO3. Add 10.0 mL
conc. HNO3 and dilute to 1,000 mL with deionized, distilled
water.
7.3.15 Manganese solution, stock, 1 mL=100 [micro]g Mn: Dissolve
0.1000 g of manganese metal in the acid mixture 10 mL conc. HCl and 1 mL
conc. HNO3, and dilute to 1,000 mL with deionized, distilled
water.
7.3.16 Molybdenum solution, stock, 1 mL=100 [micro]g Mo: Dissolve
0.2043 g (NH4)2 MoO4 in deionized,
distilled water and dilute to 1,000 mL.
7.3.17 Nickel solution, stock, 1 mL=100 [micro]g Ni: Dissolve 0.1000
g of nickel metal in 10 mL hot conc. HNO3, cool and dilute to
1,000 mL with deionized, distilled water.
7.3.18 Potassium solution, stock, 1 mL=100 [micro]g K: Dissolve
0.1907 g KCl, dried at 110 [deg]C, in deionized, distilled water and
dilute to 1,000 mL.
7.3.19 Selenium solution, stock, 1 mL=100 [micro]g Se: Do not dry.
Dissolve 0.1727 g H2SeO3 (actual assay 94.6%) in
deionized, distilled water and dilute to 1,000 mL.
7.3.20 Silica solution, stock, 1 mL=100 [micro]g SiO2: Do
not dry. Dissolve 0.4730 g
Na2SiO3[middot]9H2O in deionized,
distilled water. Add 10.0 mL conc. HNO3 and dilute to 1,000
mL with deionized, distilled water.
7.3.21 Silver solution, stock, 1 mL=100 [micro]g Ag: Dissolve 0.1575
g AgNO3 in 100 mL of deionized, distilled water and 10 mL
conc. HNO3. Dilute to 1,000 mL with deionized, distilled
water.
7.3.22 Sodium solution, stock, 1 mL=100 [micro]g Na: Dissolve 0.2542
g NaCl in deionized, distilled water. Add 10.0 mL conc. HNO3
and dilute to 1,000 mL with deionized, distilled water.
7.3.23 Thallium solution, stock, 1 mL=100 [micro]g Tl: Dissolve
0.1303 g TlNO3 in deionized, distilled water. Add 10.0 mL
conc. HNO3 and dilute to 1,000 mL with deionized, distilled
water.
7.3.24 Vanadium solution, stock, 1 mL=100 [micro]g V: Dissolve
0.2297 NH4 VO3 in a minimum amount of conc.
HNO3. Heat to increase rate of dissolution. Add 10.0 mL conc.
HNO3 and dilute to 1,000 mL with deionized, distilled water.
7.3.25 Zinc solution, stock, 1 mL=100 [micro]g Zn: Dissolve 0.1245 g
ZnO in a minimum amount of dilute HNO3. Add 10.0 mL conc.
HNO3 and dilute to 1,000 mL deionized, distilled water.
7.4 Mixed calibration standard solutions--Prepare mixed calibration
standard solutions by combining appropriate volumes of the stock
solutions in volumetric flasks. (See 7.4.1 thru 7.4.5) Add 2 mL of (1+1)
HNO3 and 10 mL of (1+1) HC1 and dilute to 100 mL with
deionized, distilled water. (See Notes 1 and 6.) Prior to preparing the
mixed standards, each stock solution should be analyzed separately to
determine possible spectral interference or the presence of impurities.
Care should be taken when preparing the
[[Page 350]]
mixed standards that the elemelts are compatible and stable. Transfer
the mixed standard solutions to a FEP fluorocarbon or unused
polyethylene bottle for storage. Fresh mixed standards should be
prepared as needed with the realization that concentration can change on
aging. Calibration standards must be initially verified using a quality
control sample and monitored weekly for stability (See 7.6.3). Although
not specifically required, some typical calibration standard
combinations follow when using those specific wavelengths listed in
Table 1.
7.4.1 Mixed standard solution I--Manganese, beryllium, cadmium,
lead, and zinc.
7.4.2 Mixed standard solution II--Barium, copper, iron, vanadium,
and cobalt.
7.4.3 Mixed standard solution III--Molybdenum, silica, arsenic, and
selenium.
7.4.4 Mixed standard solution IV--Calcium, sodium, potassium,
aluminum, chromium and nickel.
7.4.5 Mixed standard solution V-- Antimony, boron, magnesium,
silver, and thallium.
Note: 1. If the addition of silver to the recommended acid
combination results in an initial precipitation, add 15 mL of deionized
distilled water and warm the flask until the solution clears. Cool and
dilute to 100 mL with deionized, distilled water. For this acid
combination the silver concentration should be limited to 2 mg/L. Silver
under these conditions is stable in a tap water matrix for 30 days.
Higher concentrations of silver require additional HCl.
7.5 Two types of blanks are required for the analysis. The
calibration blank (3.13) is used in establishing the analytical curve
while the reagent blank (3.12) is used to correct for possible
contamination resulting from varying amounts of the acids used in the
sample processing.
7.5.1 The calibration blank is prepared by diluting 2 mL of (1+1)
HNO3 and 10 mL of (1+1) HCl to 100 mL with deionized,
distilled water. (See Note 6.) Prepare a sufficient quantity to be used
to flush the system between standards and samples.
7.5.2 The reagent blank must contain all the reagents and in the
same volumes as used in the processing of the samples. The reagent blank
must be carried through the complete procedure and contain the same acid
concentration in the final solution as the sample solution used for
analysis.
7.6 In addition to the calibration standards, an instrument check
standard (3.7), an interference check sample (3.8) and a quality control
sample (3.9) are also required for the analyses.
7.6.1 The instrument check standard is prepared by the analyst by
combining compatible elements at a concentration equivalent to the
midpoint of their respective calibration curves. (See 12.1.1.)
7.6.2 The interference check sample is prepared by the analyst in
the following manner. Select a representative sample which contains
minimal concentrations of the analytes of interest but known
concentration of interfering elements that will provide an adequate test
of the correction factors. Spike the sample with the elements of
interest at the approximate concentration of either 100 [micro]g/L or 5
times the estimated detection limits given in Table 1. (For effluent
samples of expected high concentrations, spike at an appropriate level.)
If the type of samples analyzed are varied, a synthetically prepared
sample may be used if the above criteria and intent are met.
7.6.3 The quality control sample should be prepared in the same acid
matrix as the calibration standards at a concentration near 1 mg/L and
in accordance with the instructions provided by the supplier. The
Quality Assurance Branch of EMSL-Cincinnati will either supply a quality
control sample or information where one of equal quality can be
procured. (See 12.1.3.)
8. Sample Handling and Preservation
8.1 For the determination of trace elements, contamination and loss
are of prime concern. Dust in the laboratory environment, impurities in
reagents and impurities on laboratory apparatus which the sample
contacts are all sources of potential contamination. Sample containers
can introduce either positive or negative errors in the measurement of
trace elements by (a) contributing contaminants through leaching or
surface desorption and (b) by depleting concentrations through
adsorption. Thus the collection and treatment of the sample prior to
analysis requires particular attention. Laboratory glassware including
the sample bottle (whether polyethylene, polyproplyene or FEP-
fluorocarbon) should be thoroughly washed with detergent and tap water;
rinsed with (1+1) nitric acid, tap water, (1+1) hydrochloric acid, tap
and finally deionized, distilled water in that order (See Notes 2 and
3).
Note: 2. Chromic acid may be useful to remove organic deposits from
glassware; however, the analyst should be cautioned that the glassware
must be thoroughly rinsed with water to remove the last traces of
chromium. This is especially important if chromium is to be included in
the analytical scheme. A commercial product, NOCHROMIX, available from
Godax Laboratories, 6 Varick St., New York, NY 10013, may be used in
place of chromic acid. Chromic acid should not be used with plastic
bottles.
Note: 3. If it can be documented through an active analytical
quality control program using spiked samples and reagent blanks, that
certain steps in the cleaning procedure
[[Page 351]]
are not required for routine samples, those steps may be eliminated from
the procedure.
8.2 Before collection of the sample a decision must be made as to
the type of data desired, that is dissolved, suspended or total, so that
the appropriate preservation and pretreatment steps may be accomplished.
Filtration, acid preservation, etc., are to be performed at the time the
sample is collected or as soon as possible thereafter.
8.2.1 For the determination of dissolved elements the sample must be
filtered through a 0.45-[micro]m membrane filter as soon as practical
after collection. (Glass or plastic filtering apparatus are recommended
to avoid possible contamination.) Use the first 50-100 mL to rinse the
filter flask. Discard this portion and collect the required volume of
filtrate. Acidify the filtrate with (1+1) HNO3 to a pH of 2
or less. Normally, 3 mL of (1+1) acid per liter should be sufficient to
preserve the sample.
8.2.2 For the determination of suspended elements a measured volume
of unpreserved sample must be filtered through a 0.45-[micro]m membrane
filter as soon as practical after collection. The filter plus suspended
material should be transferred to a suitable container for storage and/
or shipment. No preservative is required.
8.2.3 For the determination of total or total recoverable elements,
the sample is acidified with (1+1) HNO3 to pH 2 or less as
soon as possible, preferably at the time of collection. The sample is
not filtered before processing.
9. Sample Preparation
9.1 For the determinations of dissolved elements, the filtered,
preserved sample may often be analyzed as received. The acid matrix and
concentration of the samples and calibration standards must be the same.
(See Note 6.) If a precipitate formed upon acidification of the sample
or during transit or storage, it must be redissolved before the analysis
by adding additional acid and/or by heat as described in 9.3.
9.2 For the determination of suspended elements, transfer the
membrane filter containing the insoluble material to a 150-mL Griffin
beaker and add 4 mL conc. HNO3. Cover the beaker with a watch
glass and heat gently. The warm acid will soon dissolve the membrane.
Increase the temperature of the hot plate and digest the material. When
the acid has nearly evaporated, cool the beaker and watch glass and add
another 3 mL of conc. HNO3. Cover and continue heating until
the digestion is complete, generally indicated by a light colored
digestate. Evaporate to near dryness (2 mL), cool, and 10 mL HCl (1+1)
and 15 mL deionized, distilled water per 100 mL dilution and warm the
beaker gently for 15 min. to dissolve any precipitated or residue
material. Allow to cool, wash down the watch glass and beaker walls with
deionized distilled water and filter the sample to remove insoluble
material that could clog the nebulizer. (See Note 4.) Adjust the volume
based on the expected concentrations of elements present. This volume
will vary depending on the elements to be determined (See Note 6). The
sample is now ready for analysis. Concentrations so determined shall be
reported as ``suspended.''
Note: 4. In place of filtering, the sample after diluting and mixing
may be centrifuged or allowed to settle by gravity overnight to remove
insoluble material.
9.3 For the determination of total elements, choose a measured
volume of the well mixed acid preserved sample appropriate for the
expected level of elements and transfer to a Griffin beaker. (See Note
5.) Add 3 mL of conc. HNO3. Place the beaker on a hot plate
and evaporate to near dryness cautiously, making certain that the sample
does not boil and that no area of the bottom of the beaker is allowed to
go dry. Cool the beaker and add another 5 mL portion of conc.
HNO3. Cover the beaker with a watch glass and return to the
hot plate. Increase the temperature of the hot plate so that a gently
reflux action occurs. Continue heating, adding additional acid as
necessary, until the digestion is complete (generally indicated when the
digestate is light in color or does not change in appearance with
continued refluxing.) Again, evaporate to near dryness and cool the
beaker. Add 10 mL of 1+1 HCl and 15 mL of deionized, distilled water per
100 mL of final solution and warm the beaker gently for 15 min. to
dissolve any precipitate or residue resulting from evaporation. Allow to
cool, wash down the beaker walls and watch glass with deionized
distilled water and filter the sample to remove insoluble material that
could clog the nebulizer. (See Note 4.) Adjust the sample to a
predetermined volume based on the expected concentrations of elements
present. The sample is now ready for analysis (See Note 6).
Concentrations so determined shall be reported as ``total.''
Note: 5. If low determinations of boron are critical, quartz
glassware should be used.
Note: 6. If the sample analysis solution has a different acid
concentration from that given in 9.4, but does not introduce a physical
interference or affect the analytical result, the same calibration
standards may be used.
9.4 For the determination of total recoverable elements, choose a
measured volume of a well mixed, acid preserved sample appropriate for
the expected level of elements and transfer to a Griffin beaker. (See
Note 5.) Add 2 mL of (1+1) HNO3 and 10 mL of (1+1) HCl to the
sample and heat on a steam bath
[[Page 352]]
or hot plate until the volume has been reduced to near 25 mL making
certain the sample does not boil. After this treatment, cool the sample
and filter to remove insoluble material that could clog the nebulizer.
(See Note 4.) Adjust the volume to 100 mL and mix. The sample is now
ready for analysis. Concentrations so determined shall be reported as
``total.''
10. Procedure
10.1 Set up instrument with proper operating parameters established
in Section 6.2. The instrument must be allowed to become thermally
stable before beginning. This usually requires at least 30 min. of
operation prior to calibration.
10.2 Initiate appropriate operating configuration of computer.
10.3 Profile and calibrate instrument according to instrument
manufacturer's recommended procedures, using the typical mixed
calibration standard solutions described in Section 7.4. Flush the
system with the calibration blank (7.5.1) between each standard. (See
Note 7.) (The use of the average intensity of multiple exposures for
both standardization and sample analysis has been found to reduce random
error.)
Note: 7. For boron concentrations greater than 500 [micro]g/L
extended flush times of 1 to 2 minutes may be required.
10.4 Before beginning the sample run, reanalyze the highest mixed
calibration standard as if it were a sample. Concentration values
obtained should not deviate from the actual values by more than 5 percent (or the established control limits whichever
is lower). If they do, follow the recommendations of the instrument
manufacturer to correct for this condition.
10.5 Begin the sample run flushing the system with the calibration
blank solution (7.5.1) between each sample. (See Note 7.) Analyze the
instrument check standard (7.6.1) and the calibration blank (7.5.1) each
10 samples.
10.6 If it has been found that methods of standard addition are
required, the following procedure is recommended.
10.6.1 The standard addition technique (14.2) involves preparing new
standards in the sample matrix by adding known amounts of standard to
one or more aliquots of the processed sample solution. This technique
compensates for a sample constitutent that enhances or depresses the
analyte signal thus producing a different slope from that of the
calibration standards. It will not correct for additive interference
which causes a baseline shift. The simplest version of this technique is
the single-addition method. The procedure is as follows. Two identical
aliquots of the sample solution, each of volume VX, are
taken. To the first (labeled A) is added a small volume Vs of
a standard analyte solution of concentration cs. To the
second (labeled B) is added the same volume Vs of the
solvent. The analytical signals of A and B are measured and corrected
for nonanalyte signals. The unknown sample concentration cX
is calculated:
[GRAPHIC] [TIFF OMITTED] TC15NO91.128
where SA and SB are the analytical signals
(corrected for the blank) of solutions A and B, respectively.
Vs and cs should be chosen so that SA
is roughly twice SB on the average. It is best if
Vs is made much less than VX, and thus
cs is much greater than cX, to avoid excess
dilution of the sample matrix. If a separation or concentration step is
used, the additions are best made first and carried through the entire
procedure. For the results from this technique to be valid, the
following limitations must be taken into consideration:
1. The analytical curve must be linear.
2. The chemical form of the analyte added must respond the same as
the analyte in the sample.
3. The interference effect must be constant over the working range
of concern.
4. The signal must be corrected for any additive interference.
11. Calculation
11.1 Reagent blanks (7.5.2) should be subtracted from all samples.
This is particularly important for digested samples requiring large
quantities of acids to complete the digestion.
11.2 If dilutions were performed, the appropriate factor must be
applied to sample values.
11.3 Data should be rounded to the thousandth place and all results
should be reported in mg/L up to three significant figures.
12. Quality Control (Instrumental)
12.1 Check the instrument standardization by analyzing appropriate
quality control check standards as follow:
12.1.1 Analyze and appropriate instrument check standard (7.6.1)
containing the elements of interest at a frequency of 10%. This check
standard is used to determine instrument drift. If agreement is not
within 5% of the expected values or within the
established control limits, whichever is lower, the analysis is out of
control. The analysis should be terminated, the problem corrected, and
the instrument recalibrated.
[[Page 353]]
Analyze the calibration blank (7.5.1) at a frequency of 10%. The
result should be within the established control limits of 2 standard
deviations of the meal value. If not, repeat the analysis two more times
and average the three results. If the average is not wihin the control
limit, terminate the analysis, correct the problem and recalibrate the
instrument.
12.1.2 To verify interelement and background correction factors
analyze the interference check sample (7.6.2) at the beginning, end, and
at periodic intervals throughout the sample run. Results should fall
within the established control limits of 1.5 times the standard
deviation of the mean value. If not, terminate the analysis, correct the
problem and recalibrate the instrument.
12.1.3 A quality control sample (7.6.3) obtained from an outside
source must first be used for the initial verification of the
calibration standards. A fresh dilution of this sample shall be analyzed
every week thereafter to monitor their stability. If the results are not
within 5% of the true value listed for the control
sample, prepare a new calibration standard and recalibrate the
instrument. If this does not correct the problem, prepare a new stock
standard and a new calibration standard and repeat the calibration.
13. Precision and Accuracy
13.1 An interlaboratory study of metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of the twenty-five elements
listed in Table 4 were added to reagent water, surface water, drinking
water and three effluents. These samples were digested by both the total
digestion procedure (9.3) and the total recoverable procedure (9.4).
Results for both digestions for the twenty-five elements in reagent
water are given in Table 4; results for the other matrices can be found
in Reference 14.10.
14. References
14.1 Winge, R.K., V.J. Peterson, and V.A. Fassel, ``Inductively
Coupled Plasma-Atomic Emission Spectroscopy: Prominent Lines, EPA-600/4-
79-017.
14.2 Winefordner, J.D., ``Trace Analysis: Spectroscopic Methods for
Elements,'' Chemical Analysis, Vol, 46, pp. 41-42.
14.3 Handbook for Analytical Quality Control in Water and Wastewater
Laboratories, EPA-600/4-79-019.
14.4 Garbarino, J.R. and Taylor, H.E., ``An Inductively-Coupled
Plasma Atomic Emission Spectrometric Method for Routine Water Quality
Testing,'' Applied Spectroscopy 33, No. 3 (1979).
14.5 ``Methods for Chemical Analysis of Water and Wastes,'' EPA-600/
4-79-020.
14.6 Annual Book of ASTM Standards, Part 31.
14.7 ``Carcinogens--Working With Carcinogens,'' Department of
Health, Education, and Welfare, Public Health Service, Center for
Disease Control, National Institute for Occupational Safety and Health,
Publication No. 77-206, August 1977.
14.8 ``OSHA Safety and Health Standards, General Industry,'' (29 CFR
part 1910), Occupational Safety and Health Administration, OSHA 2206,
(Revised, January 1976).
14.9 ``Safety in Academic Chemistry Laboratories, American Chemical
Society Publication, Committee on Chemical Safety, 3rd Edition, 1979.
14.10 Maxfield R. and Minak B., ``EPA Method Study 27, Method 200.7
Trace Metals by ICP,'' National Technical Information Service, Order No.
PB 85-248-656, November 1983.
Table 1--Recommended Wavelengths \1\ and Estimated Instrumental
Detection Limits
------------------------------------------------------------------------
Estimated
detection
Element Wavelength, limit,
nm [micro]g/L
\2\
------------------------------------------------------------------------
Aluminum....................................... 308.215 45
Arsenic........................................ 193.696 53
Antimony....................................... 206.833 32
Barium......................................... 455.403 2
Beryllium...................................... 313.042 0.3
Boron.......................................... 249.773 5
Cadmium........................................ 226.502 4
Calcium........................................ 317.933 10
Chromium....................................... 267.716 7
Cobalt......................................... 228.616 7
Copper......................................... 324.754 6
Iron........................................... 259.940 7
Lead........................................... 220.353 42
Magnesium...................................... 279.079 30
Manganese...................................... 257.610 2
Molybdenum..................................... 202.030 8
Nickel......................................... 231.604 15
Potassium...................................... 766.491 \3\
Selenium....................................... 196.026 75
Silica (SiO2).................................. 288.158 58
Silver......................................... 328.068 7
Sodium......................................... 588.995 29
Thallium....................................... 190.864 40
Vanadium....................................... 292.402 8
Zinc........................................... 213.856 2
------------------------------------------------------------------------
\1\The wavelengths listed are recommended because of their sensitivity
and overall acceptance. Other wavelengths may be substituted if they
can provide the needed sensitivity and are treated with the same
corrective techniques for spectral interference. (See 5.1.1).
\2\The estimated instrumental detection limits as shown are taken from
``Inductively Coupled Plasma-Atomic Emission Spectroscopy-Prominent
Lines,'' EPA-600/4-79-017. They are given as a guide for an
instrumental limit. The actual method detection limits are sample
dependent and may vary as the sample matrix varies.
\3\Highly dependent on operating conditions and plasma position.
[[Page 354]]
Table 1--Analyte Concentration Equivalents (mg/L) Arising From Interferents at the 100 mg/L Level
--------------------------------------------------------------------------------------------------------------------------------------------------------
Interferent--
Analyte Wavelength, -----------------------------------------------------------------------
nm A1 Ca Cr Cu Fe Mg Mn Ni Ti V
--------------------------------------------------------------------------------------------------------------------------------------------------------
Aluminum........................................................... 308.214 ..... ..... ..... ..... ...... ...... 0.21 ..... ..... 1.4
Antimony........................................................... 206.833 0.47 ..... 2.9 ..... 0.08 ...... ..... ..... 0.25 0.45
Arsenic............................................................ 193.696 1.3 ..... 0.44 ..... ...... ...... ..... ..... ..... 1.1
Barium............................................................. 455.403 ..... ..... ..... ..... ...... ...... ..... ..... ..... .....
Beryllium.......................................................... 313.042 ..... ..... ..... ..... ...... ...... ..... ..... 0.04 0.05
Boron.............................................................. 249.773 0.04 ..... ..... ..... 0.32 ...... ..... ..... ..... .....
Cadmium............................................................ 226.502 ..... ..... ..... ..... 0.03 ...... ..... 0.02 ..... .....
Calcium............................................................ 317.933 ..... ..... 0.08 ..... 0.01 0.01 0.04 ..... 0.03 0.03
Chromium........................................................... 267.716 ..... ..... ..... ..... 0.003 ...... 0.04 ..... ..... 0.04
Cobalt............................................................. 228.616 ..... ..... 0.03 ..... 0.005 ...... ..... 0.03 0.15 .....
Copper............................................................. 324.754 ..... ..... ..... ..... 0.003 ...... ..... ..... 0.05 0.02
Iron............................................................... 259.940 ..... ..... ..... ..... ...... ...... 0.12 ..... ..... .....
Lead............................................................... 220.353 0.17 ..... ..... ..... ...... ...... ..... ..... ..... .....
Magnesium.......................................................... 279.079 ..... 0.02 0.11 ..... 0.13 ...... 0.25 ..... 0.07 0.12
Manganese.......................................................... 257.610 0.005 ..... 0.01 ..... 0.002 0.002 ..... ..... ..... .....
Molybdenum......................................................... 202.030 0.05 ..... ..... ..... 0.03 ...... ..... ..... ..... .....
Nickel............................................................. 231.604 ..... ..... ..... ..... ...... ...... ..... ..... ..... .....
Selenium........................................................... 196.026 0.23 ..... ..... ..... 0.09 ...... ..... ..... ..... .....
Silicon............................................................ 288.158 ..... ..... 0.07 ..... ...... ...... ..... ..... ..... 0.01
Sodium............................................................. 588.995 ..... ..... ..... ..... ...... ...... ..... ..... 0.08 .....
Thallium........................................................... 190.864 0.30 ..... ..... ..... ...... ...... ..... ..... ..... .....
Vanadium........................................................... 292.402 ..... ..... 0.05 ..... 0.005 ...... ..... ..... 0.02 .....
Zinc............................................................... 213.856 ..... ..... ..... 0.14 ...... ...... ..... 0.29 ..... .....
--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 3--Interferent and Analyte Elemental Concentrations Used for Interference Measuremelts in Table 2
----------------------------------------------------------------------------------------------------------------
Analytes (mg/L) Interferents (mg/L)
----------------------------------------------------------------------------------------------------------------
Al.................. 10 ......... Al.................. 1,000 .................
AS.................. 10 ......... Ca.................. 1,000 .................
B................... 10 ......... Cr.................. 200 .................
Ba.................. 1 ......... Cu.................. 200 .................
Be.................. 1 ......... Fe.................. 1,000 .................
Ca.................. 1 ......... Mg.................. 1,000 .................
Cd.................. 10 ......... Mn.................. 200 .................
Co.................. 1 ......... Ni.................. 200
Cr.................. 1 ......... Ti.................. 200
Cu.................. 1 ......... V................... 200 .................
Fe.................. 1
Mg.................. 1
Mn.................. 1
Mo.................. 10
Na.................. 10
Ni.................. 10
Pb.................. 10
Sb.................. 10
Se.................. 10
Si.................. 1
Tl.................. 10
V................... 1
Zn.................. 10
----------------------------------------------------------------------------------------------------------------
Table 4--ICP Precision and Recovery Data
----------------------------------------------------------------------------------------------------------------
Concentration Total digestion (9.3) Recoverable digestion
Analyte [micro]g/L [micro]g/L (9.4) [micro]g/L
----------------------------------------------------------------------------------------------------------------
Aluminum...................................... 69-4792 X=0.9273(C)+3.6 X=0.9380(C)+22.1
................ S=0.0559(X)+18.6 S=0.0873(X)+31.7
................ SR=0.0507(X)+3.5 SR=0.0481(X)+18.8
Antimony...................................... 77-1406 X=0.7940(C)-17.0 X=0.8908(C)+0.9
................ S=0.1556(X)-0.6 S=0.0982(X)+8.3
................ SR=0.1081(X)+3.9 SR=0.0682(X)+2.5
Arsenic....................................... 69-1887 X=1.0437(C)-12.2 X=1.0175(C)+3.9
................ S=0.1239(X)+2.4 S=0.1288(X)+6.1
................ SR=0.0874(X)+6.4 SR=0.0643(X)+10.3
[[Page 355]]
Barium........................................ 9-377 X=0.7683(C)+0.47 X=0.8380(C)+1.68
................ S=0.1819(X)+2.78 S=0.2540(X)+0.30
................ SR=0.1285(X)+2.55 SR=0.0826(X)+3.54
Beryllium..................................... 3-1906 X=0.9629(C)+0.05 X=1.0177(C)-0.55
................ S=0.0136(X)+0.95 S=0.0359(X)+0.90
................ SR=0.0203(X)-0.07 SR=0.0445(X)-0.10
Boron......................................... 19-5189 X=0.8807(C)+9.0 X=0.9676(C)+18.7
................ S=0.1150(X)+14.1 S=0.1320(X)+16.0
................ SR=0.0742(X)+23.2 SR=0.0743(X)+21.1
Cadmium....................................... 9-1943 X=0.9874(C)-0.18 X=1.0137(C)-0.65
................ S=0.557(X)+2.02 S=0.0585(X)+1.15
................ SR=0.0300(X)+0.94 SR=0.332(X)+0.90
Calcium....................................... 17-47170 X=0.9182(C)-2.6 X=0.9658(C)+0.8
................ S=0.1228(X)+10.1 S=0.0917(X)+6.9
................ SR=0.0189(X)+3.7 SR=0.0327(X)+10.1
Chromium...................................... 13-1406 X=0.9544(C)+3.1 X=1.0049(C)-1.2
................ S=0.0499(X)+4.4 S=0.0698(X)+2.8
................ SR=0.0009(X)+7.9 SR=0.0571(X)+1.0
Cobalt........................................ 17-2340 X=0.9209(C)-4.5 X=0.9278(C)-1.5
................ S=0.0436(X)+3.8 S=0.0498(X)+2.6
................ SR=0.0428(X)+0.5 SR=0.0407(X)+0.4
Copper........................................ 8-1887 X=0.9297(C)-0.30 X=0.9647(C)-3.64
................ S=0.0442(X)+2.85 S=0.0497(X)+2.28
................ SR=0.0128(X)+2.53 SR=0.0406(X)+0.96
Iron.......................................... 13-9359 X=0.8829(C)+7.0 X=0.9830(C)+5.7
................ S=0.0683(X)+11.5 S=0.1024(X)+13.0
................ SR=0.0046(X)+10.0 SR=0.0790(X)+11.5
Lead.......................................... 42-4717 X=0.9699(C)-2.2 X=1.0056(C)+4.1
................ S=0.0558(X)+7.0 S=0.0779(X)+4.6
................ SR=0.0353(X)+3.6 SR=0.0448(X)+3.5
Magnesium..................................... 34-13868 X=0.9881(C)-1.1 X=0.9879(C)+2.2
................ S=0.0607(C)+11.6 S=0.0564(X)+13.2
................ SR=0.0298(X)+0.6 SR=0.0268(X)+8.1
Manganese..................................... 4-1887 X=0.9417(C)+0.13 X=0.9725(C)+0.07
................ S=0.0324(X)+0.88 S=0.0557(X)+0.76
................ SR=0.0153(X)+0.91 SR=0.0400(X)+0.82
Molybdenum.................................... 17-1830 X=0.9682(C)+0.1 X=0.9707(C)-2.3
................ S=0.0618(X)+1.6 S=0.0811(X)+3.8
................ SR=0.0371(X)+2.2 SR=0.0529(X)+2.1
Nickel........................................ 17-47170 X=0.9508(C)+0.4 X=0.9869(C)+1.5
................ S=0.0604(X)+4.4 S=0.0526(X)+5.5
................ SR=0.0425(X)+3.6 SR=0.0393(X)+2.2
Potassium..................................... 347-14151 X=0.8669(C)-36.4 X=0.9355(C)-183.1
................ S=0.0934(X)+77.8 S=0.0481(X)+177.2
................ SR=0.0099(X)+144.2 SR=0.0329(X)+60.9
Selenium...................................... 69-1415 X=0.9363(C)-2.5 X=0.9737(C)-1.0
................ S=0.0855(X)+17.8 S=0.1523(X)+7.8
................ SR=0.0284(X)+9.3 SR=0.0443(X)+6.6
Silicon....................................... 189-9434 X=0.5742(C)-35.6 X=0.9737(C)-60.8
................ S=0.4160(X)+37.8 S=0.3288(X)+46.0
................ SR=0.1987(X)+8.4 SR=0.2133(X)+22.6
Silver........................................ 8-189 X=0.4466(C)+5.07 X=0.3987(C)+8.25
................ S=0.5055(X)-3.05 S=0.5478(X)-3.93
................ SR=0.2086(X)-1.74 SR=0.1836(X)-0.27
Sodium........................................ 35-47170 X=0.9581(C)+39.6 X=1.0526(C)+26.7
................ S=0.2097(X)+33.0 S=0.1473(X)+27.4
................ SR=0.0280(X)+105.8 SR=0.0884(X)+50.5
Thallium...................................... 79-1434 X=0.9020(C)-7.3 X=0.9238(C)+5.5
................ S=0.1004(X)+18.3 S=0.2156(X)+5.7
................ SR=0.0364(X)+11.5 SR=0.0106(X)+48.0
Vanadium...................................... 13-4698 X=0.9615(C)-2.0 X=0.9551(C)+0.4
................ S=0.0618(X)+1.7 S=0.0927(X)+1.6
................ SR=0.0220(X)+0.7 SR=0.0472(X)+0.5
Zinc.......................................... 7-7076 X=0.9356(C)-0.30 X=0.9500(C)+1.82
................ S=0.0914(X)+3.75 S=0.0597(X)+6.50
................ SR=0.0130(X)+10.7 SR=0.0153(X)+7.78
----------------------------------------------------------------------------------------------------------------
AAAAAX=Mean Recovery, [micro]g/L
AAAAAC=True Value for the Concentration, [micro]g/L
AAAAAS=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
[[Page 356]]
[49 FR 43431, Oct. 26, 1984; 50 FR 695, 696, Jan. 4, 1985, as amended at
51 FR 23703, June 30, 1986; 55 FR 33440, Aug. 15, 1990]
Sec. Appendix D to Part 136--Precision and Recovery Statements for
Methods for Measuring Metals
Twenty-eight selected methods from ``Methods for Chemical Analysis
of Water and Wastes,'' EPA-600/4-79-020 (1979) have been subjected to
interlaboratory method validation studies. The following precision and
recovery statements are presented in this appendix and incorporated into
part 136:
Method 202.1
For Aluminum, Method 202.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in water by
Atomic Absorption Spectroscopy (Direction Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June, 1986.
For a concentration range of 500-1200 [micro]g/L
X=0.979(C)+6.16
S=0.066(X)+125
SR=0.086(X)+40.5
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 206.4
For Arsenic, Method 206.4 (Spectrophotometric-SDDC) add the
following to the Precision and Accuracy Section:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
Results for the reagent water are given below. Results for other water
types and study details are found in ``USEPA Method Study 7, Analyses
for Trace Methods in Water by Atomic Absorption Spectroscopy (Direct
Aspiration) and Colorimetry'', National Technical Information Service,
5285 Port Royal Road, Springfield, VA 22161, Order No. PB86-208709/AS,
Winter, J.A. and Britton, P.W., June, 1986.
For a concentration range of 20-292 [micro]g/L
X=0.850(C)-0.25
S=0.198(X)+5.93
SR=0.122(X)+3.10
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 213.1
For Cadmium, Method 213.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June, 1986.
For a concentration range of 14-78 [micro]g/L
X=0.919(C)+2.97
S=0.108(X)+5.08
SR=0.120(X)+0.89
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
[[Page 357]]
Method 218.1
For Chromium, Method 218.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June 1986.
For a concentration range of 74-407 [micro]g/L
X=0.976(C)+3.94
S=0.131(X)+4.26
SR=0.052(X)+3.01
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 220.1
For Copper, Method 220.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June, 1986.
For concentration range 60-332 [micro]g/L
X=0.963(C)+3.49
S=0.047(X)+12.3
SR=0.042(X)+4.60
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 236.1
For Iron, Method 236.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trade Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June, 1986.
For concentration range 350-840 [micro]g/L
X=0.999(C)-2.21
S=0.022(X)+41.0
SR=0.019(X)+21.2
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-Laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 239.1
For Lead, Method 239.1 (Atomic Absorption, Direct Aspiration)
replace Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7 Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy
[[Page 358]]
(Direct Aspiration) and Colorimetry''; National Technical Information
Service, 5285 Port Royal Road, Springfield, VA 22161, Order No. PB86-
208709/AS, Winter, J.A. and Britton, P.W., June, 1986.
For concentration range of 84-367 [micro]g/L
X=0.961(C)+13.8
S=0.028(C)+33.9
SR=0.011(X)+16.1
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 243.1
For Manganese, Method 243.1 (Atomic Absorption, Direct Aspiration)
replace Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J.A. and
Britton, P.W., June, 1986.
For concentration range 84-469 [micro]g/L
X=0.987(C)-1.27
S=0.042(X)+8.95
SR=0.023(X)+4.90
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 289.1
For Zinc, Method 289.1 (Atomic Absorption, Direct Aspiration)
replace the Precision and Accuracy Section with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory-Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water and a natural water or effluent of the analyst's choice.
The digestion procedure was not specified. Results for the reagent water
are given below. Results for other water types and study details are
found in ``USEPA Method Study 7, Analyses for Trace Methods in Water by
Atomic Absorption Spectroscopy (Direct Aspiration) and Colorimetry'',
National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161, Order No. PB86-208709/AS, Winter, J. A. and
Britton, P. W., June, 1986.
For concentration range 56-310 [micro]g/L
X=0.999(C)+0.033
S=0.078(X)+10.8
SR=0.049(X)+1.10
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 202.2
For Aluminum, Method 202.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory-Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques), ``National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161, Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.46-125 [micro]g/L
X=1.1579(C)-0.121
S=0.4286(X)-0.124
SR=0.2908(X)-0.082
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
[[Page 359]]
Method 204.2
For Antimony, Method 204.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory-Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual as modified by this method. Results for the reagent water are
given below. Results for other water types and study details are found
in ``EPA Method Study 31, Trace Metals by Atomic Absorption (Furnace
Techniques),'' National Technical Information Service, 5285 Port Royal
Road, Springfield, VA 22161, Order No. PB 86-121 704/AS, by Copeland,
F.R. and Maney, J.P., January 1986.
For a concentration range of 10.50-240 [micro]g/L
X=0.7219(C)-0.986
S=0.3732(X)+0.854
SR=0.1874(X)-0.461
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 206.2
For Arsenic, Method 206.2 (Atomic Absorption, Furnace Technique) add
the following to the existing Precision and Accuracy statement:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory-Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents.
Results for the reagent water are given below. Results for other water
types and study details are found in ``EPA Method Study 31, Trace Metals
by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161, Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 9.78-237 [micro]g/L
X=0.9652(C)+2.112
S=0.1411(X)+1.873
SR=0.0464(X)+2.109
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 208.2
For Barium, Method 208.2 (Atomic Absorption, Furnace Technique) add
the following to the existing Precision and Accuracy information:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161, Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 56.50-437 [micro]g/L
X=0.8268(C)+59.459
S=0.2466(X)+6.436
SR=0.1393(X)-0.428
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 210.2
For Beryllium, Method 210.2 (Atomic Absorption, Furnace Technique)
replace the existing Precision and Accuracy statement with the
following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31,
[[Page 360]]
Trace Metals by Atomic Absorption (Furnace Techniques),'' National
Technical Information Service, 5285 Port Royal Road, Springfield, VA
22161, Order No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P.,
January 1986.
For a concentration range of 0.45-11.4 [micro]g/L
X=1.0682(C)-0.158
S=0.2167(X)+0.090
SR=0.1096(X)+0.061
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 213.2
For Cadmium, Method 213.2 (Atomic Absorption, Furnace Technique) add
the following to the existing Precision and Accuracy information:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring System Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161, Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.43-12.5 [micro]g/L
X=0.9826(C)+0.171
S=0.2300(X)+0.045
SR=0.1031(X)+0.116
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Devision, [micro]g/L
Method 218.2
For Chromium, Method 218.2 (Atomic Absorption, Furnace Technique)
add the following to the existing Precision and Accuracy Section:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161, Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 9.87-246 [micro]g/L
X=0.9120(C)+0.234
S=0.1684(X)+0.852
SR=0.1469(X)+0.315
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Devision, [micro]g/L
Method 219.2
For Cobalt, Method 219.2 (Atomic Absorption, Furnace Technique),
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 21.10-461 [micro]g/L
X=0.8875(C)+0.859
S=0.2481(X)-2.541
SR=0.0969(X)+0.134
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
[[Page 361]]
Method 220.2
For Copper, Method 220.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.30-245 [micro]g/L
X=0.9253(C)+0.010
S=0.2735(X)-0.058
SR=0.2197(X)-0.050
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 236.2
For Iron, Method 236.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.37-455 [micro]g/L
X=1.4494(C)-0.229
S=0.3611(X)-0.079
SR=0.3715(X)-0.161
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 239.2
For Lead, Method 239.2 (Atomic Absorption, Furnace Technique) add
the following to the existing Precisions and Accuracy Section:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 10.40-254 [micro]g/L
X=0.9430(C)-0.504
S=0.2224(X)+0.507
SR=0.1931(X)-0.378
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 243.2
For Manganese, Method 243.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL--CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below.
[[Page 362]]
Results for other water types and study details are found in ``EPA
Method Study 31, Trace Metals by Atomic Absorption (Furnace
Techniques),'' National Technical Information Service, 5285 Port Royal
Road, Springfield, VA 22161. Order No. PB 86-121 704/AS, by Copeland,
F.R. and Maney, J.P., January 1986.
For a concentration range of 0.42-666 [micro]g/L
X=1.0480(C)+1.404
S=0.2001(X)+1.042
SR=0.1333(X)+0.680
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 249.2
For Nickel, Method 249.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL--CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161. Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 26.20-482 [micro]g/L
X=0.8812(C)+2.426
S=0.2475(X)+1.896
SR=0.1935(X)+1.315
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 270.2
For Selenium, Method 270.2 (Atomic Absorption, Furnace Technique)
add the following to the existing Precision and Accuracy Section:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL--CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents.
Results for the reagent water are given below. Results for other water
types and study details are found in ``EPA Method Study 31, Trace Metals
by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161. Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 10.00-246 [micro]g/L
X=0.9564(C)+0.476
S=0.1584(X)+0.878
SR=0.0772(X)+0.547
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 272.2
For Silver, Method 272.2 (Atomic Absorption, Furnace Technique) add
the following to the existing Precision and Accuracy Section:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL--CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161. Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.45-56.5 [micro]g/L
X=0.9470(C)+0.181
S=0.1805(X)+0.153
SR=0.1417(X)+0.039
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
[[Page 363]]
SR=Single-analyst Standard Deviation, [micro]g/L
Method 279.2
For Thalliu, Method 279.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 10.00-252 [micro]g/L.
X=0.8781(C)-0.715
S=0.1112(X)+0.669
SR=0.1005(X)+0.241
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 286.2
For Vanadium, Method 286.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 1.36-982 [micro]g/L.
X=0.8486(C)+0.252
S=0.3323(X)-0.428
SR=0.1195(X)-0.121
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
Method 289.2
For Zinc, Method 289.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the Environmental
Monitoring Systems Laboratory--Cincinnati (EMSL-CI). Synthetic
concentrates containing various levels of this element were added to
reagent water, surface water, drinking water and three effluents. These
samples were digested by the total digestion procedure, 4.1.3 in this
manual. Results for the reagent water are given below. Results for other
water types and study details are found in ``EPA Method Study 31, Trace
Metals by Atomic Absorption (Furnace Techniques),'' National Technical
Information Service, 5285 Port Royal Road, Springfield, VA 22161 Order
No. PB 86-121 704/AS, by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.51-189 [micro]g/L.
X=1.6710(C)+1.485
S=0.6740(X)-0.342
SR=0.3895(X)-0.384
where:
C=True Value for the Concentration, [micro]g/L
X=Mean Recovery, [micro]g/L
S=Multi-laboratory Standard Deviation, [micro]g/L
SR=Single-analyst Standard Deviation, [micro]g/L
[55 FR 33442, Aug. 15, 1990]
PART 140_MARINE SANITATION DEVICE STANDARD--Table of Contents
Sec.
140.1 Definitions.
140.2 Scope of standard.
140.3 Standard.
140.4 Complete prohibition.
140.5 Analytical procedures.
Authority: 33 U.S.C. 1322, as amended.
[[Page 364]]
Source: 41 FR 4453, Jan. 29, 1976, unless otherwise noted.
Sec. 140.1 Definitions.
For the purpose of these standards the following definitions shall
apply:
(a) Sewage means human body wastes and the wastes from toilets and
other receptacles intended to receive or retain body wastes;
(b) Discharge includes, but is not limited to, any spilling,
leaking, pumping, pouring, emitting, emptying, or dumping;
(c) Marine sanitation device includes any equipment for installation
onboard a vessel and which is designed to receive, retain, treat, or
discharge sewage and any process to treat such sewage;
(d) Vessel includes every description of watercraft or other
artificial contrivance used, or capable of being used, as a means of
transportation on waters of the United States;
(e) New vessel refers to any vessel on which construction was
initiated on or after January 30, 1975;
(f) Existing vessel refers to any vessel on which construction was
initiated before January 30, 1975;
(g) Fecal coliform bacteria are those organisms associated with the
intestines of warm-blooded animals that are commonly used to indicate
the presence of fecal material and the potential presence of organisms
capable of causing human disease.
Sec. 140.2 Scope of standard.
The standard adopted herein applies only to vessels on which a
marine sanitation device has been installed. The standard does not
require the installation of a marine sanitation device on any vessel
that is not so equipped. The standard applies to vessels owned and
operated by the United States unless the Secretary of Defense finds that
compliance would not be in the interest of national security.
Sec. 140.3 Standard.
(a) (1) In freshwater lakes, freshwater reservoirs or other
freshwater impoundments whose inlets or outlets are such as to prevent
the ingress or egress by vessel traffic subject to this regulation, or
in rivers not capable of navigation by interstate vessel traffic subject
to this regulation, marine sanitation devices certified by the U.S.
Coast Guard (see 33 CFR part 159, published in 40 FR 4622, January 30,
1975), installed on all vessels shall be designed and operated to
prevent the overboard discharge of sewage, treated or untreated, or of
any waste derived from sewage. This shall not be construed to prohibit
the carriage of Coast Guard-certified flow-through treatment devices
which have been secured so as to prevent such discharges.
(2) In all other waters, Coast Guard-certified marine sanitation
devices installed on all vessels shall be designed and operated to
either retain, dispose of, or discharge sewage. If the device has a
discharge, subject to paragraph (d) of this section, the effluent shall
not have a fecal coliform bacterial count of greater than 1,000 per 100
milliliters nor visible floating solids. Waters where a Coast Guard-
certified marine sanitation device permitting discharge is allowed
include coastal waters and estuaries, the Great Lakes and inter-
connected waterways, fresh-water lakes and impoundments accessible
through locks, and other flowing waters that are navigable interstate by
vessels subject to this regulation.
(b) This standard shall become effective on January 30, 1977 for new
vessels and on January 30, 1980 for existing vessels (or, in the case of
vessels owned and operated by the Department of Defense, two years and
five years, for new and existing vessels, respectively, after
promulgation of implementing regulations by the Secretary of Defense
under section 312(d) of the Act).
(c) Any vessel which is equipped as of the date of promulgation of
this regulation with a Coast Guard-certified flow-through marine
sanitation device meeting the requirements of paragraph (a)(2) of this
section, shall not be required to comply with the provisions designed to
prevent the overboard discharge of sewage, treated or untreated, in
paragraph (a)(1) of this section, for the operable life of that device.
(d) After January 30, 1980, subject to paragraphs (e) and (f) of
this section, marine sanitation devices on all vessels on waters that
are not subject to a prohibition of the overboard discharge
[[Page 365]]
of sewage, treated or untreated, as specified in paragraph (a)(1) of
this section, shall be designed and operated to either retain, dispose
of, or discharge sewage, and shall be certified by the U.S. Coast Guard.
If the device has a discharge, the effluent shall not have a fecal
coliform bacterial count of greater than 200 per 100 milliliters, nor
suspended solids greater than 150 mg/1.
(e) Any existing vessel on waters not subject to a prohibition of
the overboard discharge of sewage in paragraph (a)(1) of this section,
and which is equipped with a certified device on or before January 30,
1978, shall not be required to comply with paragraph (d) of this
section, for the operable life of that device.
(f) Any new vessel on waters not subject to the prohibition of the
overboard discharge of sewage in paragraph (a)(1) of this section, and
on which construction is initiated before January 31, 1980, which is
equipped with a marine sanitation device before January 31, 1980,
certified under paragraph (a)(2) of this section, shall not be required
to comply with paragraph (d) of this section, for the operable life of
that device.
(g) The degrees of treatment described in paragraphs (a) and (d) of
this section are ``appropriate standards'' for purposes of Coast Guard
and Department of Defense certification pursuant to section 312(g)(2) of
the Act.
[41 FR 4453, Jan. 29, 1976, as amended at 60 FR 33932, June 29, 1995]
Sec. 140.4 Complete prohibition.
(a) Prohibition pursuant to CWA section 312(f)(3): a State may
completely prohibit the discharge from all vessels of any sewage,
whether treated or not, into some or all of the waters within such State
by making a written application to the Administrator, Environmental
Protection Agency, and by receiving the Administrator's affirmative
determination pursuant to section 312(f)(3) of the Act. Upon receipt of
an application under section 312(f)(3) of the Act, the Administrator
will determine within 90 days whether adequate facilities for the safe
and sanitary removal and treatment of sewage from all vessels using such
waters are reasonably available. Applications made by States pursuant to
section 312(f)(3) of the Act shall include:
(1) A certification that the protection and enhancement of the
waters described in the petition require greater environmental
protection than the applicable Federal standard;
(2) A map showing the location of commercial and recreational pump-
out facilities;
(3) A description of the location of pump-out facilities within
waters designated for no discharge;
(4) The general schedule of operating hours of the pump-out
facilities;
(5) The draught requirements on vessels that may be excluded because
of insufficient water depth adjacent to the facility;
(6) Information indicating that treatment of wastes from such pump-
out facilities is in conformance with Federal law; and
(7) Information on vessel population and vessel usage of the subject
waters.
(b) Prohibition pursuant to CWA section 312(f)(4)(A): a State may
make a written application to the Administrator, Environmental
Protection Agency, under section 312(f)(4)(A) of the Act, for the
issuance of a regulation completely prohibiting discharge from a vessel
of any sewage, whether treated or not, into particular waters of the
United States or specified portions thereof, which waters are located
within the boundaries of such State. Such application shall specify with
particularly the waters, or portions thereof, for which a complete
prohibition is desired. The application shall include identification of
water recreational areas, drinking water intakes, aquatic sanctuaries,
identifiable fish-spawning and nursery areas, and areas of intensive
boating activities. If, on the basis of the State's application and any
other information available to him, the Administrator is unable to make
a finding that the waters listed in the application require a complete
prohibition of any discharge in the waters or portions thereof covered
by the application, he shall state the reasons why he cannot make such a
finding, and shall deny the application. If the Administrator makes a
finding that the waters listed in the application require a complete
prohibition of any
[[Page 366]]
discharge in all or any part of the waters or portions thereof covered
by the State's application, he shall publish notice of such findings
together with a notice of proposed rule making, and then shall proceed
in accordance with 5 U.S.C. 553. If the Administrator's finding is that
applicable water quality standards require a complete prohibition
covering a more restricted or more expanded area than that applied for
by the State, he shall state the reasons why his finding differs in
scope from that requested in the State's application.
(1) For the following waters the discharge from a vessel of any
sewage (whether treated or not) is completely prohibited pursuant to CWA
section 312(f)(4)(A):
(i) Boundary Waters Canoe Area, formerly designated as the Superior,
Little Indian Sioux, and Caribou Roadless Areas, in the Superior
National Forest, Minnesota, as described in 16 U.S.C. 577-577d1.
(ii) Waters of the State of Florida within the boundaries of the
Florida Keys National Marine Sanctuary as delineated on a map of the
Sanctuary at http://www.fknms.nos.noaa.gov/.
(c)(1) Prohibition pursuant to CWA section 312(f)(4)(B): A State may
make written application to the Administrator of the Environmental
Protection Agency under section 312(f)(4)(B) of the Act for the issuance
of a regulation establishing a drinking water intake no discharge zone
which completely prohibits discharge from a vessel of any sewage,
whether treated or untreated, into that zone in particular waters, or
portions thereof, within such State. Such application shall:
(i) Identify and describe exactly and in detail the location of the
drinking water supply intake(s) and the community served by the
intake(s), including average and maximum expected amounts of inflow;
(ii) Specify and describe exactly and in detail, the waters, or
portions thereof, for which a complete prohibition is desired, and where
appropriate, average, maximum and low flows in million gallons per day
(MGD) or the metric equivalent;
(iii) Include a map, either a USGS topographic quadrant map or a
NOAA nautical chart, as applicable, clearly marking by latitude and
longitude the waters or portions thereof to be designated a drinking
water intake zone; and
(iv) Include a statement of basis justifying the size of the
requested drinking water intake zone, for example, identifying areas of
intensive boating activities.
(2) If the Administrator finds that a complete prohibition is
appropriate under this paragraph, he or she shall publish notice of such
finding together with a notice of proposed rulemaking, and then shall
proceed in accordance with 5 U.S.C. 553. If the Administrator's finding
is that a complete prohibition covering a more restricted or more
expanded area than that applied for by the State is appropriate, he or
she shall also include a statement of the reasons why the finding
differs in scope from that requested in the State's application.
(3) If the Administrator finds that a complete prohibition is
inappropriate under this paragraph, he or she shall deny the application
and state the reasons for such denial.
(4) For the following waters the discharge from a vessel of any
sewage, whether treated or not, is completely prohibited pursuant to CWA
section 312(f)(4)(B):
(i) Two portions of the Hudson River in New York State, the first is
bounded by an east-west line through the most northern confluence of the
Mohawk River which will be designated by the Troy-Waterford Bridge
(126th Street Bridge) on the south and Lock 2 on the north, and the
second of which is bounded on the north by the southern end of
Houghtaling Island and on the south by a line between the Village of
Roseton on the western shore and Low Point on the eastern shore in the
vicinity of Chelsea, as described in Items 2 and 3 of 6 NYCRR Part
858.4.
(ii) [Reserved]
[41 FR 4453, Jan. 29, 1976, as amended at 42 FR 43837, Aug. 31, 1977; 60
FR 63945, Dec. 13, 1995; 63 FR 1320, Jan. 8, 1998; 67 FR 35743, May 21,
2002]
[[Page 367]]
Sec. 140.5 Analytical procedures.
In determining the composition and quality of effluent discharge
from marine sanitation devices, the procedures contained in 40 CFR part
136, ``Guidelines Establishing Test Procedures for the Analysis of
Pollutants,'' or subsequent revisions or amendments thereto, shall be
employed.
PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents
Subpart A_General
Sec.
141.1 Applicability.
141.2 Definitions.
141.3 Coverage.
141.4 Variances and exemptions.
141.5 Siting requirements.
141.6 Effective dates.
Subpart B_Maximum Contaminant Levels
141.11 Maximum contaminant levels for inorganic chemicals.
141.12 [Reserved]
141.13 Maximum contaminant levels for turbidity.
Subpart C_Monitoring and Analytical Requirements
141.21 Coliform sampling.
141.22 Turbidity sampling and analytical requirements.
141.23 Inorganic chemical sampling and analytical requirements.
141.24 Organic chemicals, sampling and analytical requirements.
141.25 Analytical methods for radioactivity.
141.26 Monitoring frequency and compliance requirements for
radionuclides in community water systems
141.27 Alternate analytical techniques.
141.28 Certified laboratories.
141.29 Monitoring of consecutive public water systems.
Appendix A to Subpart C of Part 141--Alternative Testing Methods
Approved for Analyses Under the Safe Drinking Water Act
Subpart D_Reporting and Recordkeeping
141.31 Reporting requirements.
141.32 [Reserved]
141.33 Record maintenance.
141.34 [Reserved]
141.35 Reporting for unregulated contaminant monitoring results.
Subpart E_Special Regulations, Including Monitoring Regulations and
Prohibition on Lead Use
141.40 Monitoring requirements for unregulated contaminants.
141.41 Special monitoring for sodium.
141.42 Special monitoring for corrosivity characteristics.
141.43 Prohibition on use of lead pipes, solder, and flux.
Subpart F_Maximum Contaminant Level Goals and Maximum Residual
Disinfectant Level Goals
141.50 Maximum contaminant level goals for organic contaminants.
141.51 Maximum contaminant level goals for inorganic contaminants.
141.52 Maximum contaminant level goals for microbiological contaminants.
141.53 Maximum contaminant level goals for disinfection byproducts.
141.54 Maximum residual disinfectant level goals for disinfectants.
141.55 Maximum contaminant level goals for radionuclides.
Subpart G_National Primary Drinking Water Regulations: Maximum
Contaminant Levels and Maximum Residual Disinfectant Levels
141.60 Effective dates.
141.61 Maximum contaminant levels for organic contaminants.
141.62 Maximum contaminant levels for inorganic contaminants.
141.63 Maximum contaminant levels (MCLs) for microbiological
contaminants.
141.64 Maximum contaminant levels for disinfection byproducts.
141.65 Maximum residual disinfectant levels.
141.66 Maximum contaminant levels for radionuclides.
Subpart H_Filtration and Disinfection
141.70 General requirements.
141.71 Criteria for avoiding filtration.
141.72 Disinfection.
141.73 Filtration.
141.74 Analytical and monitoring requirements.
141.75 Reporting and recordkeeping requirements.
141.76 Recycle provisions.
Subpart I_Control of Lead and Copper
141.80 General requirements.
[[Page 368]]
141.81 Applicability of corrosion control treatment steps to small,
medium-size and large water systems.
141.82 Description of corrosion control treatment requirements.
141.83 Source water treatment requirements.
141.84 Lead service line replacement requirements.
141.85 Public education and supplemental monitoring requirements.
141.86 Monitoring requirements for lead and copper in tap water.
141.87 Monitoring requirements for water quality parameters.
141.88 Monitoring requirements for lead and copper in source water.
141.89 Analytical methods.
141.90 Reporting requirements.
141.91 Recordkeeping requirements.
Subpart J_Use of Non-Centralized Treatment Devices
141.100 Criteria and procedures for public water systems using point-of-
entry devices.
141.101 Use of bottled water.
Subpart K_Treatment Techniques
141.110 General requirements.
141.111 Treatment techniques for acrylamide and epichlorohydrin.
Subpart L_Disinfectant Residuals, Disinfection Byproducts, and
Disinfection Byproduct Precursors
141.130 General requirements.
141.131 Analytical requirements.
141.132 Monitoring requirements.
141.133 Compliance requirements.
141.134 Reporting and recordkeeping requirements.
141.135 Treatment technique for control of disinfection byproduct (DBP)
precursors.
Subparts M-N [Reserved]
Subpart O_Consumer Confidence Reports
141.151 Purpose and applicability of this subpart.
141.152 Effective dates.
141.153 Content of the reports.
141.154 Required additional health information.
141.155 Report delivery and recordkeeping.
Appendix A to Subpart O of Part 141--Regulated Contaminants
Subpart P_Enhanced Filtration and Disinfection_Systems Serving 10,000 or
More People
141.170 General requirements.
141.171 Criteria for avoiding filtration.
141.172 Disinfection profiling and benchmarking.
141.173 Filtration.
141.174 Filtration sampling requirements.
141.175 Reporting and recordkeeping requirements.
Subpart Q_Public Notification of Drinking Water Violations
141.201 General public notification requirements.
141.202 Tier 1 Public Notice--Form, manner, and frequency of notice.
141.203 Tier 2 Public Notice--Form, manner, and frequency of notice.
141.204 Tier 3 Public Notice--Form, manner, and frequency of notice.
141.205 Content of the public notice.
141.206 Notice to new billing units or new customers.
141.207 Special notice of the availability of unregulated contaminant
monitoring results.
141.208 Special notice for exceedance of the SMCL for fluoride.
141.209 Special notice for nitrate exceedances above MCL by non-
community water systems (NCWS), where granted permission by
the primacy agency under Sec. 141.11(d).
141.210 Notice by primacy agency on behalf of the public water system.
141.211 Special notice for repeated failure to conduct monitoring of the
source water for Cryptosporidium and for failure to determine
bin classification or mean Cryptosporidium level.
Appendix A to Subpart Q of Part 141--NPDWR Violations and Situations
Requiring Public Notice
Appendix B to Subpart Q of Part 141--Standard Health Effects Language
for Public Notification
Appendix C to Subpart Q of Part 141--List of Acronyms Used in Public
Notification Regulation
Subpart R [Reserved]
Subpart S_Ground Water Rule
141.400 General requirements and applicability.
141.401 Sanitary surveys for ground water systems.
141.402 Ground water source microbial monitoring and analytical methods.
141.403 Treatment technique requirements for ground water systems.
141.404 Treatment technique violations for ground water systems.
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141.405 Reporting and recordkeeping for ground water systems.
Subpart T_Enhanced Filtration and Disinfection_Systems Serving Fewer
Than 10,000 People
General Requirements
141.500 General requirements.
141.501 Who is subject to the requirements of subpart T?
141.502 When must my system comply with these requirements?
141.503 What does subpart T require?
Finished Water Reservoirs
141.510 Is my system subject to the new finished water reservoir
requirements?
141.511 What is required of new finished water reservoirs?
Additional Watershed Control Requirements for Unfiltered Systems
141.520 Is my system subject to the updated watershed control
requirements?
141.521 What updated watershed control requirements must my unfiltered
system implement to continue to avoid filtration?
141.522 How does the State determine whether my system's watershed
control requirements are adequate?
Disinfection Profile
141.530 What is a disinfection profile and who must develop one?
141.531 What criteria must a State use to determine that a profile is
unnecessary?
141.532 How does my system develop a disinfection profile and when must
it begin?
141.533 What data must my system collect to calculate a disinfection
profile?
141.534 How does my system use this data to calculate an inactivation
ratio?
141.535 What if my system uses chloramines, ozone, or chlorine dioxide
for primary disinfection?
141.536 My system has developed an inactivation ratio; what must we do
now?
Disinfection Benchmark
141.540 Who has to develop a disinfection benchmark?
141.541 What are significant changes to disinfection practice?
141.542 What must my system do if we are considering a significant
change to disinfection practices?
141.543 How is the disinfection benchmark calculated?
141.544 What if my system uses chloramines, ozone, or chlorine dioxide
for primary disinfection?
Combined Filter Effluent Requirements
141.550 Is my system required to meet subpart T combined filter effluent
turbidity limits?
141.551 What strengthened combined filter effluent turbidity limits must
my system meet?
141.552 My system consists of ``alternative filtration'' and is required
to conduct a demonstration--what is required of my system and
how does the State establish my turbidity limits?
141.553 My system practices lime softening--is there any special
provision regarding my combined filter effluent?
Individual Filter Turbidity Requirements
141.560 Is my system subject to individual filter turbidity
requirements?
141.561 What happens if my system's turbidity monitoring equipment
fails?
141.562 My system only has two or fewer filters--is there any special
provision regarding individual filter turbidity monitoring?
141.563 What follow-up action is my system required to take based on
continuous turbidity monitoring?
141.564 My system practices lime softening--is there any special
provision regarding my individual filter turbidity monitoring?
Reporting and Recordkeeping Requirements
141.570 What does subpart T require that my system report to the State?
141.571 What records does subpart T require my system to keep?
Subpart U_Initial Distribution System Evaluations
141.600 General requirements.
141.601 Standard monitoring.
141.602 System specific studies.
141.603 40/30 certification.
141.604 Very small system waivers.
141.605 Subpart V compliance monitoring location recommendations.
Subpart V_Stage 2 Disinfection Byproducts Requirements
141.620 General requirements.
141.621 Routine monitoring.
141.622 Subpart V monitoring plan.
141.623 Reduced monitoring.
141.624 Additional requirements for consecutive systems.
141.625 Conditions requiring increased monitoring.
141.626 Operational evaluation levels.
141.627 Requirements for remaining on reduced TTHM and HAA5 monitoring
based on subpart L results.
[[Page 370]]
141.628 Requirements for remaining on increased TTHM and HAA5 monitoring
based on subpart L results.
141.629 Reporting and recordkeeping requirements.
Subpart W_Enhanced Treatment for Cryptosporidium
General Requirements
141.700 General requirements.
Source Water Monitoring Requirements
141.701 Source water monitoring.
141.702 Sampling schedules.
141.703 Sampling locations.
141.704 Analytical methods.
141.705 Approved laboratories.
141.706 Reporting source water monitoring results.
141.707 Grandfathering previously collected data.
Disinfection Profiling and Benchmarking Requirements
141.708 Requirements when making a significant change in disinfection
practice.
141.709 Developing the disinfection profile and benchmark.
Treatment Technique Requirements
141.710 Bin classification for filtered systems.
141.711 Filtered system additional Cryptosporidium treatment
requirements.
141.712 Unfiltered system Cryptosporidium treatment requirements.
141.713 Schedule for compliance with Cryptosporidium treatment
requirements.
141.714 Requirements for uncovered finished water storage facilities.
Requirements for Microbial Toolbox Components
141.715 Microbial toolbox options for meeting Cryptosporidium treatment
requirements.
141.716 Source toolbox components.
141.717 Pre-filtration treatment toolbox components.
141.718 Treatment performance toolbox components.
141.719 Additional filtration toolbox components.
141.720 Inactivation toolbox components.
Reporting and Recordkeeping Requirements
141.721 Reporting requirements.
141.722 Recordkeeping requirements.
Requirements for Sanitary Surveys Performed by EPA
141.723 Requirements to respond to significant deficiencies identified
in sanitary surveys performed by EPA.
Subpart X_Aircraft Drinking Water Rule
141.800 Applicability and compliance date.
141.801 Definitions.
141.802 Coliform sampling plan.
141.803 Coliform sampling.
141.804 Aircraft water system operations and maintenance plan.
141.805 Notification to passengers and crew.
141.806 Reporting requirements.
141.807 Recordkeeping requirements.
141.808 Audits and inspections.
141.809 Supplemental treatment.
141.810 Violations.
Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5,
300g-6, 300j-4, 300j-9, and 300j-11.
Source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.
Editorial Note: Nomenclature changes to part 141 appear at 69 FR
18803, Apr. 9, 2004.
Note: For community water systems serving 75,000 or more persons,
monitoring must begin 1 year following promulation and the effective
date of the MCL is 2 years following promulgation. For community water
systems serving 10,000 to 75,000 persons, monitoring must begin within 3
years from the date of promulgation and the effective date of the MCL is
4 years from the date of promulgation. Effective immediately, systems
that plan to make significant modifications to their treatment processes
for the purpose of complying with the TTHM MCL are required to seek and
obtain State approval of their treatment modification plans. This note
affects Sec. Sec. 141.2, 141.6, 141.12, 141.24 and 141.30. For
additional information see 44 FR 68641, Nov. 29, 1979.
Subpart A_General
Sec. 141.1 Applicability.
This part establishes primary drinking water regulations pursuant to
section 1412 of the Public Health Service Act, as amended by the Safe
Drinking Water Act (Pub. L. 93-523); and related regulations applicable
to public water systems.
Sec. 141.2 Definitions.
As used in this part, the term:
Act means the Public Health Service Act, as amended by the Safe
Drinking Water Act, Public Law 93-523.
[[Page 371]]
Action level, is the concentration of lead or copper in water
specified in Sec. 141.80(c) which determines, in some cases, the
treatment requirements contained in subpart I of this part that a water
system is required to complete.
Bag filters are pressure-driven separation devices that remove
particulate matter larger than 1 micrometer using an engineered porous
filtration media. They are typically constructed of a non-rigid, fabric
filtration media housed in a pressure vessel in which the direction of
flow is from the inside of the bag to outside.
Bank filtration is a water treatment process that uses a well to
recover surface water that has naturally infiltrated into ground water
through a river bed or bank(s). Infiltration is typically enhanced by
the hydraulic gradient imposed by a nearby pumping water supply or other
well(s).
Best available technology or BAT means the best technology,
treatment techniques, or other means which the Administrator finds,
after examination for efficacy under field conditions and not solely
under laboratory conditions, are available (taking cost into
consideration). For the purposes of setting MCLs for synthetic organic
chemicals, any BAT must be at least as effective as granular activated
carbon.
Cartridge filters are pressure-driven separation devices that remove
particulate matter larger than 1 micrometer using an engineered porous
filtration media. They are typically constructed as rigid or semi-rigid,
self-supporting filter elements housed in pressure vessels in which flow
is from the outside of the cartridge to the inside.
Coagulation means a process using coagulant chemicals and mixing by
which colloidal and suspended materials are destabilized and
agglomerated into flocs.
Combined distribution system is the interconnected distribution
system consisting of the distribution systems of wholesale systems and
of the consecutive systems that receive finished water.
Community water system means a public water system which serves at
least 15 service connections used by year-round residents or regularly
serves at least 25 year-round residents.
Compliance cycle means the nine-year calendar year cycle during
which public water systems must monitor. Each compliance cycle consists
of three three-year compliance periods. The first calendar year cycle
begins January 1, 1993 and ends December 31, 2001; the second begins
January 1, 2002 and ends December 31, 2010; the third begins January 1,
2011 and ends December 31, 2019.
Compliance period means a three-year calendar year period within a
compliance cycle. Each compliance cycle has three three-year compliance
periods. Within the first compliance cycle, the first compliance period
runs from January 1, 1993 to December 31, 1995; the second from January
1, 1996 to December 31, 1998; the third from January 1, 1999 to December
31, 2001.
Comprehensive performance evaluation (CPE) is a thorough review and
analysis of a treatment plant's performance-based capabilities and
associated administrative, operation and maintenance practices. It is
conducted to identify factors that may be adversely impacting a plant's
capability to achieve compliance and emphasizes approaches that can be
implemented without significant capital improvements. For purpose of
compliance with subparts P and T of this part, the comprehensive
performance evaluation must consist of at least the following
components: Assessment of plant performance; evaluation of major unit
processes; identification and prioritization of performance limiting
factors; assessment of the applicability of comprehensive technical
assistance; and preparation of a CPE report.
Confluent growth means a continuous bacterial growth covering the
entire filtration area of a membrane filter, or a portion thereof, in
which bacterial colonies are not discrete.
Consecutive system is a public water system that receives some or
all of its finished water from one or more wholesale systems. Delivery
may be through a direct connection or through the distribution system of
one or more consecutive systems.
Contaminant means any physical, chemical, biological, or
radiological substance or matter in water.
[[Page 372]]
Conventional filtration treatment means a series of processes
including coagulation, flocculation, sedimentation, and filtration
resulting in substantial particulate removal.
Corrosion inhibitor means a substance capable of reducing the
corrosivity of water toward metal plumbing materials, especially lead
and copper, by forming a protective film on the interior surface of
those materials.
CT or CTcalc is the product of ``residual disinfectant
concentration'' (C) in mg/1 determined before or at the first customer,
and the corresponding ``disinfectant contact time'' (T) in minutes,
i.e., ``C'' x ``T''. If a public water system applies disinfectants at
more than one point prior to the first customer, it must determine the
CT of each disinfectant sequence before or at the first customer to
determine the total percent inactivation or ``total inactivation
ratio.'' In determining the total inactivation ratio, the public water
system must determine the residual disinfectant concentration of each
disinfection sequence and corresponding contact time before any
subsequent disinfection application point(s). ``CT99.9'' is
the CT value required for 99.9 percent (3-log) inactivation of Giardia
lamblia cysts. CT99.9 for a variety of disinfectants and
conditions appear in tables 1.1-1.6, 2.1, and 3.1 of Sec. 141.74(b)(3).
[GRAPHIC] [TIFF OMITTED] TC15NO91.129
is the inactivation ratio. The sum of the inactivation ratios, or total
inactivation ratio shown as
[GRAPHIC] [TIFF OMITTED] TC15NO91.130
is calculated by adding together the inactivation ratio for each
disinfection sequence. A total inactivation ratio equal to or greater
than 1.0 is assumed to provide a 3-log inactivation of Giardia lamblia
cysts.
Diatomaceous earth filtration means a process resulting in
substantial particulate removal in which (1) a precoat cake of
diatomaceous earth filter media is deposited on a support membrance
(septum), and (2) while the water is filtered by passing through the
cake on the septum, additional filter media known as body feed is
continuously added to the feed water to maintain the permeability of the
filter cake.
Direct filtration means a series of processes including coagulation
and filtration but excluding sedimentation resulting in substantial
particulate removal.
Disinfectant means any oxidant, including but not limited to
chlorine, chlorine dioxide, chloramines, and ozone added to water in any
part of the treatment or distribution process, that is intended to kill
or inactivate pathogenic microorganisms.
Disinfectant contact time (``T'' in CT calculations) means the time
in minutes that it takes for water to move from the point of
disinfectant application or the previous point of disinfectant residual
measurement to a point before or at the point where residual
disinfectant concentration (``C'') is measured. Where only one ``C'' is
measured, ``T'' is the time in minutes that it takes for water to move
from the point of disinfectant application to a point before or at where
residual disinfectant concentration (``C'') is measured. Where more than
one ``C'' is measured, ``T'' is (a) for the first measurement of ``C'',
the time in minutes that it takes for water to move from the first or
only point of disinfectant application to a point before or at the point
where the first ``C'' is measured and (b) for subsequent measurements of
``C'', the time in minutes that it takes for water to move from the
previous ``C'' measurement point to the ``C'' measurement point for
which the particular ``T'' is being calculated. Disinfectant contact
time in pipelines must be calculated based on ``plug flow'' by dividing
the internal volume of the pipe by the maximum hourly flow rate through
that pipe. Disinfectant contact time within mixing basins and storage
reservoirs must be determined by tracer studies or an equivalent
demonstration.
Disinfection means a process which inactivates pathogenic organisms
in water by chemical oxidants or equivalent agents.
[[Page 373]]
Disinfection profile is a summary of Giardia lamblia inactivation
through the treatment plant. The procedure for developing a disinfection
profile is contained in Sec. 141.172 (Disinfection profiling and
benchmarking) in subpart P and Sec. Sec. 141.530-141.536 (Disinfection
profile) in subpart T of this part.
Domestic or other non-distribution system plumbing problem means a
coliform contamination problem in a public water system with more than
one service connection that is limited to the specific service
connection from which the coliform-positive sample was taken.
Dose equivalent means the product of the absorbed dose from ionizing
radiation and such factors as account for differences in biological
effectiveness due to the type of radiation and its distribution in the
body as specified by the International Commission on Radiological Units
and Measurements (ICRU).
Dual sample set is a set of two samples collected at the same time
and same location, with one sample analyzed for TTHM and the other
sample analyzed for HAA5. Dual sample sets are collected for the
purposes of conducting an IDSE under subpart U of this part and
determining compliance with the TTHM and HAA5 MCLs under subpart V of
this part.
Effective corrosion inhibitor residual, for the purpose of subpart I
of this part only, means a concentration sufficient to form a
passivating film on the interior walls of a pipe.
Enhanced coagulation means the addition of sufficient coagulant for
improved removal of disinfection byproduct precursors by conventional
filtration treatment.
Enhanced softening means the improved removal of disinfection
byproduct precursors by precipitative softening.
Filter profile is a graphical representation of individual filter
performance, based on continuous turbidity measurements or total
particle counts versus time for an entire filter run, from startup to
backwash inclusively, that includes an assessment of filter performance
while another filter is being backwashed.
Filtration means a process for removing particulate matter from
water by passage through porous media.
Finished water is water that is introduced into the distribution
system of a public water system and is intended for distribution and
consumption without further treatment, except as treatment necessary to
maintain water quality in the distribution system (e.g., booster
disinfection, addition of corrosion control chemicals).
First draw sample means a one-liter sample of tap water, collected
in accordance with Sec. 141.86(b)(2), that has been standing in
plumbing pipes at least 6 hours and is collected without flushing the
tap.
Flocculation means a process to enhance agglomeration or collection
of smaller floc particles into larger, more easily settleable particles
through gentle stirring by hydraulic or mechanical means.
Flowing stream is a course of running water flowing in a definite
channel.
GAC10 means granular activated carbon filter beds with an empty-bed
contact time of 10 minutes based on average daily flow and a carbon
reactivation frequency of every 180 days, except that the reactivation
frequency for GAC10 used as a best available technology for compliance
with subpart V MCLs under Sec. 141.64(b)(2) shall be 120 days.
GAC20 means granular activated carbon filter beds with an empty-bed
contact time of 20 minutes based on average daily flow and a carbon
reactivation frequency of every 240 days.
Ground water under the direct influence of surface water (GWUDI)
means any water beneath the surface of the ground with significant
occurrence of insects or other macroorganisms, algae, or large-diameter
pathogens such as Giardia lamblia or Cryptosporidium, or significant and
relatively rapid shifts in water characteristics such as turbidity,
temperature, conductivity, or pH which closely correlate to
climatological or surface water conditions. Direct influence must be
determined for individual sources in accordance with criteria
established by the State. The State determination of direct influence
may be based on site-specific measurements of
[[Page 374]]
water quality and/or documentation of well construction characteristics
and geology with field evaluation.
Gross alpha particle activity means the total radioactivity due to
alpha particle emission as inferred from measurements on a dry sample.
Gross beta particle activity means the total radioactivity due to
beta particle emission as inferred from measurements on a dry sample.
Haloacetic acids (five) (HAA5) mean the sum of the concentrations in
milligrams per liter of the haloacetic acid compounds (monochloroacetic
acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid,
and dibromoacetic acid), rounded to two significant figures after
addition.
Halogen means one of the chemical elements chlorine, bromine or
iodine.
Initial compliance period means the first full three-year compliance
period which begins at least 18 months after promulgation, except for
contaminants listed at Sec. 141.61(a) (19)-(21), (c) (19)-(33), and
Sec. 141.62(b) (11)-(15), initial compliance period means the first
full three-year compliance period after promulgation for systems with
150 or more service connections (January 1993-December 1995), and first
full three-year compliance period after the effective date of the
regulation (January 1996-December 1998) for systems having fewer than
150 service connections.
Lake/reservoir refers to a natural or man made basin or hollow on
the Earth's surface in which water collects or is stored that may or may
not have a current or single direction of flow.
Large water system, for the purpose of subpart I of this part only,
means a water system that serves more than 50,000 persons.
Lead service line means a service line made of lead which connects
the water main to the building inlet and any lead pigtail, gooseneck or
other fitting which is connected to such lead line.
Legionella means a genus of bacteria, some species of which have
caused a type of pneumonia called Legionnaires Disease.
Locational running annual average (LRAA) is the average of sample
analytical results for samples taken at a particular monitoring location
during the previous four calendar quarters.
Man-made beta particle and photon emitters means all radionuclides
emitting beta particles and/or photons listed in Maximum Permissible
Body Burdens and Maximum Permissible Concentration of Radionuclides in
Air or Water for Occupational Exposure, NBS Handbook 69, except the
daughter products of thorium-232, uranium-235 and uranium-238.
Maximum contaminant level means the maximum permissable level of a
contaminant in water which is delivered to any user of a public water
system.
Maximum contaminant level goal or MCLG means the maximum level of a
contaminant in drinking water at which no known or anticipated adverse
effect on the health of persons would occur, and which allows an
adequate margin of safety. Maximum contaminant level goals are
nonenforceable health goals.
Maximum residual disinfectant level (MRDL) means a level of a
disinfectant added for water treatment that may not be exceeded at the
consumer's tap without an unacceptable possibility of adverse health
effects. For chlorine and chloramines, a PWS is in compliance with the
MRDL when the running annual average of monthly averages of samples
taken in the distribution system, computed quarterly, is less than or
equal to the MRDL. For chlorine dioxide, a PWS is in compliance with the
MRDL when daily samples are taken at the entrance to the distribution
system and no two consecutive daily samples exceed the MRDL. MRDLs are
enforceable in the same manner as maximum contaminant levels under
Section 1412 of the Safe Drinking Water Act. There is convincing
evidence that addition of a disinfectant is necessary for control of
waterborne microbial contaminants. Notwithstanding the MRDLs listed in
Sec. 141.65, operators may increase residual disinfectant levels of
chlorine or chloramines (but not chlorine dioxide) in the distribution
system to a level and for a time necessary to protect public health to
address specific microbiological contamination problems caused by
circumstances such as distribution line breaks, storm runoff events,
source water contamination, or cross-connections.
[[Page 375]]
Maximum residual disinfectant level goal (MRDLG) means the maximum
level of a disinfectant added for water treatment at which no known or
anticipated adverse effect on the health of persons would occur, and
which allows an adequate margin of safety. MRDLGs are nonenforceable
health goals and do not reflect the benefit of the addition of the
chemical for control of waterborne microbial contaminants.
Maximum Total Trihalomethane Potential (MTP) means the maximum
concentration of total trihalomethanes produced in a given water
containing a disinfectant residual after 7 days at a temperature of 25
[deg]C or above.
Medium-size water system, for the purpose of subpart I of this part
only, means a water system that serves greater than 3,300 and less than
or equal to 50,000 persons.
Membrane filtration is a pressure or vacuum driven separation
process in which particulate matter larger than 1 micrometer is rejected
by an engineered barrier, primarily through a size-exclusion mechanism,
and which has a measurable removal efficiency of a target organism that
can be verified through the application of a direct integrity test. This
definition includes the common membrane technologies of microfiltration,
ultrafiltration, nanofiltration, and reverse osmosis.
Near the first service connection means at one of the 20 percent of
all service connections in the entire system that are nearest the water
supply treatment facility, as measured by water transport time within
the distribution system.
Non-community water system means a public water system that is not a
community water system. A non-community water system is either a
``transient non-community water system (TWS)'' or a ``non-transient non-
community water system (NTNCWS).''
Non-transient non-community water system or NTNCWS means a public
water system that is not a community water system and that regularly
serves at least 25 of the same persons over 6 months per year.
Optimal corrosion control treatment, for the purpose of subpart I of
this part only, means the corrosion control treatment that minimizes the
lead and copper concentrations at users' taps while insuring that the
treatment does not cause the water system to violate any national
primary drinking water regulations.
Performance evaluation sample means a reference sample provided to a
laboratory for the purpose of demonstrating that the laboratory can
successfully analyze the sample within limits of performance specified
by the Agency. The true value of the concentration of the reference
material is unknown to the laboratory at the time of the analysis.
Person means an individual; corporation; company; association;
partnership; municipality; or State, Federal, or tribal agency.
Picocurie (pCi) means the quantity of radioactive material producing
2.22 nuclear transformations per minute.
Plant intake refers to the works or structures at the head of a
conduit through which water is diverted from a source (e.g., river or
lake) into the treatment plant.
Point of disinfectant application is the point where the
disinfectant is applied and water downstream of that point is not
subject to recontamination by surface water runoff.
Point-of-entry treatment device (POE) is a treatment device applied
to the drinking water entering a house or building for the purpose of
reducing contaminants in the drinking water distributed throughout the
house or building.
Point-of-use treatment device (POU) is a treatment device applied to
a single tap used for the purpose of reducing contaminants in drinking
water at that one tap.
Presedimentation is a preliminary treatment process used to remove
gravel, sand and other particulate material from the source water
through settling before the water enters the primary clarification and
filtration processes in a treatment plant.
Public water system means a system for the provision to the public
of water for human consumption through pipes or, after August 5, 1998,
other constructed conveyances, if such system has at least fifteen
service connections or regularly serves an average of at
[[Page 376]]
least twenty-five individuals daily at least 60 days out of the year.
Such term includes: any collection, treatment, storage, and distribution
facilities under control of the operator of such system and used
primarily in connection with such system; and any collection or
pretreatment storage facilities not under such control which are used
primarily in connection with such system. Such term does not include any
``special irrigation district.'' A public water system is either a
``community water system'' or a ``noncommunity water system.''
Rem means the unit of dose equivalent from ionizing radiation to the
total body or any internal organ or organ system. A ``millirem (mrem)''
is 1/1000 of a rem.
Repeat compliance period means any subsequent compliance period
after the initial compliance period.
Residual disinfectant concentration (``C'' in CT calculations) means
the concentration of disinfectant measured in mg/l in a representative
sample of water.
Sanitary survey means an onsite review of the water source,
facilities, equipment, operation and maintenance of a public water
system for the purpose of evaluating the adequacy of such source,
facilities, equipment, operation and maintenance for producing and
distributing safe drinking water.
Sedimentation means a process for removal of solids before
filtration by gravity or separation.
Service connection, as used in the definition of public water
system, does not include a connection to a system that delivers water by
a constructed conveyance other than a pipe if:
(1) The water is used exclusively for purposes other than
residential uses (consisting of drinking, bathing, and cooking, or other
similar uses);
(2) The State determines that alternative water to achieve the
equivalent level of public health protection provided by the applicable
national primary drinking water regulation is provided for residential
or similar uses for drinking and cooking; or
(3) The State determines that the water provided for residential or
similar uses for drinking, cooking, and bathing is centrally treated or
treated at the point of entry by the provider, a pass-through entity, or
the user to achieve the equivalent level of protection provided by the
applicable national primary drinking water regulations.
Service line sample means a one-liter sample of water collected in
accordance with Sec. 141.86(b)(3), that has been standing for at least
6 hours in a service line.
Single family structure, for the purpose of subpart I of this part
only, means a building constructed as a single-family residence that is
currently used as either a residence or a place of business.
Slow sand filtration means a process involving passage of raw water
through a bed of sand at low velocity (generally less than 0.4 m/h)
resulting in substantial particulate removal by physical and biological
mechanisms.
Small water system, for the purpose of subpart I of this part only,
means a water system that serves 3,300 persons or fewer.
Special irrigation district means an irrigation district in
existence prior to May 18, 1994 that provides primarily agricultural
service through a piped water system with only incidental residential or
similar use where the system or the residential or similar users of the
system comply with the exclusion provisions in section 1401(4)(B)(i)(II)
or (III).
Standard sample means the aliquot of finished drinking water that is
examined for the presence of coliform bacteria.
State means the agency of the State or Tribal government which has
jurisdiction over public water systems. During any period when a State
or Tribal government does not have primary enforcement responsibility
pursuant to section 1413 of the Act, the term ``State'' means the
Regional Administrator, U.S. Environmental Protection Agency.
Subpart H systems means public water systems using surface water or
ground water under the direct influence of surface water as a source
that are subject to the requirements of subpart H of this part.
Supplier of water means any person who owns or operates a public
water system.
[[Page 377]]
Surface water means all water which is open to the atmosphere and
subject to surface runoff.
SUVA means Specific Ultraviolet Absorption at 254 nanometers (nm),
an indicator of the humic content of water. It is a calculated parameter
obtained by dividing a sample's ultraviolet absorption at a wavelength
of 254 nm (UV 254) (in m\=1\) by its concentration of
dissolved organic carbon (DOC) (in mg/L).
System with a single service connection means a system which
supplies drinking water to consumers via a single service line.
Too numerous to count means that the total number of bacterial
colonies exceeds 200 on a 47-mm diameter membrane filter used for
coliform detection.
Total Organic Carbon (TOC) means total organic carbon in mg/L
measured using heat, oxygen, ultraviolet irradiation, chemical oxidants,
or combinations of these oxidants that convert organic carbon to carbon
dioxide, rounded to two significant figures.
Total trihalomethanes (TTHM) means the sum of the concentration in
milligrams per liter of the trihalomethane compounds (trichloromethane
[chloroform], dibromochloromethane, bromodichloromethane and
tribromomethane [bromoform]), rounded to two significant figures.
Transient non-community water system or TWS means a non-community
water system that does not regularly serve at least 25 of the same
persons over six months per year.
Trihalomethane (THM) means one of the family of organic compounds,
named as derivatives of methane, wherein three of the four hydrogen
atoms in methane are each substituted by a halogen atom in the molecular
structure.
Two-stage lime softening is a process in which chemical addition and
hardness precipitation occur in each of two distinct unit clarification
processes in series prior to filtration.
Uncovered finished water storage facility is a tank, reservoir, or
other facility used to store water that will undergo no further
treatment to reduce microbial pathogens except residual disinfection and
is directly open to the atmosphere.
Virus means a virus of fecal origin which is infectious to humans by
waterborne transmission.
Waterborne disease outbreak means the significant occurrence of
acute infectious illness, epidemiologically associated with the
ingestion of water from a public water system which is deficient in
treatment, as determined by the appropriate local or State agency.
Wholesale system is a public water system that treats source water
as necessary to produce finished water and then delivers some or all of
that finished water to another public water system. Delivery may be
through a direct connection or through the distribution system of one or
more consecutive systems.
[40 FR 59570, Dec. 24, 1975]
Editorial Note: For Federal Register citations affecting Sec.
141.2, see the List of CFR Sections Affected, which appears in the
Finding Aids section of the printed volume and on GPO Access.
Sec. 141.3 Coverage.
This part shall apply to each public water system, unless the public
water system meets all of the following conditions:
(a) Consists only of distribution and storage facilities (and does
not have any collection and treatment facilities);
(b) Obtains all of its water from, but is not owned or operated by,
a public water system to which such regulations apply:
(c) Does not sell water to any person; and
(d) Is not a carrier which conveys passengers in interstate
commerce.
Sec. 141.4 Variances and exemptions.
(a) Variances or exemptions from certain provisions of these
regulations may be granted pursuant to sections 1415 and 1416 of the Act
and subpart K of part 142 of this chapter (for small system variances)
by the entity with primary enforcement responsibility, except that
variances or exemptions from the MCL for total coliforms and variances
from any of the treatment technique requirements of subpart H of this
part may not be granted.
[[Page 378]]
(b) EPA has stayed the effective date of this section relating to
the total coliform MCL of Sec. 141.63(a) for systems that demonstrate
to the State that the violation of the total coliform MCL is due to a
persistent growth of total coliforms in the distribution system rather
than fecal or pathogenic contamination, a treatment lapse or deficiency,
or a problem in the operation or maintenance of the distribution system.
[54 FR 27562, June 29, 1989, as amended at 56 FR 1557, Jan. 15, 1991; 63
FR 43846, Aug. 14, 1998]
Sec. 141.5 Siting requirements.
Before a person may enter into a financial commitment for or
initiate construction of a new public water system or increase the
capacity of an existing public water system, he shall notify the State
and, to the extent practicable, avoid locating part or all of the new or
expanded facility at a site which:
(a) Is subject to a significant risk from earthquakes, floods, fires
or other disasters which could cause a breakdown of the public water
system or a portion thereof; or
(b) Except for intake structures, is within the floodplain of a 100-
year flood or is lower than any recorded high tide where appropriate
records exist. The U.S. Environmental Protection Agency will not seek to
override land use decisions affecting public water systems siting which
are made at the State or local government levels.
Sec. 141.6 Effective dates.
(a) Except as provided in paragraphs (b) through (k) of this
section, and in Sec. 141.80(a)(2), the regulations set forth in this
part shall take effect on June 24, 1977.
(b) The regulations for total trihalomethanes set forth in Sec.
141.12(c) shall take effect 2 years after the date of promulgation of
these regulations for community water systems serving 75,000 or more
individuals, and 4 years after the date of promulgation for communities
serving 10,000 to 74,999 individuals.
(c) The regulations set forth in Sec. Sec. 141.11(d); 141.21(a),
(c) and (i); 141.22(a) and (e); 141.23(a)(3) and (a)(4); 141.23(f);
141.24(e) and (f); 141.25(e); 141.27(a); 141.28(a) and (b); 141.31(a),
(d) and (e); 141.32(b)(3); and 141.32(d) shall take effect immediately
upon promulgation.
(d) The regulations set forth in Sec. 141.41 shall take effect 18
months from the date of promulgation. Suppliers must complete the first
round of sampling and reporting within 12 months following the effective
date.
(e) The regulations set forth in Sec. 141.42 shall take effect 18
months from the date of promulgation. All requirements in Sec. 141.42
must be completed within 12 months following the effective date.
(f) The regulations set forth in Sec. 141.11(c) and Sec. 141.23(g)
are effective May 2, 1986. Section 141.23(g)(4) is effective October 2,
1987.
(g) The regulations contained in Sec. 141.6, paragraph (c) of the
table in 141.12, and 141.62(b)(1) are effective July 1, 1991. The
regulations contained in Sec. Sec. 141.11(b), 141.23, 141.24,
142.57(b), 143.4(b)(12) and (b)(13), are effective July 30, 1992. The
regulations contained in the revisions to Sec. Sec. 141.32(e) (16),
(25) through (27) and (46); 141.61(c)(16); and 141.62(b)(3) are
effective January 1, 1993. The effective date of regulations contained
in Sec. 141.61(c) (2), (3), and (4) is postponed.
(h) Regulations for the analytic methods listed at Sec.
141.23(k)(4) for measuring antimony, beryllium, cyanide, nickel, and
thallium are effective August 17, 1992. Regulations for the analytic
methods listed at Sec. 141.24(f)(16) for dichloromethane, 1,2,4-
trichlorobenzene, and 1,1,2-trichloroethane are effective August 17,
1992. Regulations for the analytic methods listed at Sec. 141.24(h)(12)
for measuring dalapon, dinoseb, diquat, endothall, endrin, glyphosate,
oxamyl, picloram, simazine, benzo(a)pyrene, di(2-ethylhexyl)adipate,
di(2-ethylhexyl)phthalate, hexachlorobenzene, hexachlorocyclopentadiene,
and 2,3,7,8-TCDD are effective August 17, 1992. The revision to Sec.
141.12(a) promulgated on July 17, 1992 is effective on August 17, 1992.
(i) [Reserved]
(j) The arsenic maximum contaminant levels (MCL) listed in Sec.
141.62 is effective for the purpose of compliance
[[Page 379]]
on January 23, 2006. Requirements relating to arsenic set forth in
Sec. Sec. 141.23(i)(4), 141.23(k)(3) introductory text,
141.23(k)(3)(ii), 141.51(b), 141.62(b), 141.62(b)(16), 141.62(c),
141.62(d), and 142.62(b) revisions in Appendix A of subpart O for the
consumer confidence rule, and Appendices A and B of subpart Q for the
public notification rule are effective for the purpose of compliance on
January 23, 2006. However, the consumer confidence rule reporting
requirements relating to arsenic listed in Sec. 141.154(b) and (f) are
effective for the purpose of compliance on February 22, 2002.
(k) Regulations set forth in Sec. Sec. 141.23(i)(1), 141.23(i)(2),
141.24(f)(15), 141.24(f)(22), 141.24(h)(11), 141.24(h)(20), 142.16(e),
142.16(j), and 142.16(k) are effective for the purpose of compliance on
January 22, 2004.
[44 FR 68641, Nov. 29, 1979, as amended at 45 FR 57342, Aug. 27, 1980;
47 FR 10998, Mar. 12, 1982; 51 FR 11410, Apr. 2, 1986; 56 FR 30274, July
1, 1991; 57 FR 22178, May 27, 1992; 57 FR 31838, July 17, 1992; 59 FR
34322, July 1, 1994; 61 FR 24368, May 14, 1996; 66 FR 7061, Jan. 22,
2001; 66 FR 28350, May 22, 2001]
Subpart B_Maximum Contaminant Levels
Sec. 141.11 Maximum contaminant levels for inorganic chemicals.
(a) The maximum contaminant level for arsenic applies only to
community water systems. The analyses and determination of compliance
with the 0.05 milligrams per liter maximum contaminant level for arsenic
use the requirements of Sec. 141.23.
(b) The maximum contaminant level for arsenic is 0.05 milligrams per
liter for community water systems until January 23, 2006.
(c) [Reserved]
(d) At the discretion of the State, nitrate levels not to exceed 20
mg/l may be allowed in a non-community water system if the supplier of
water demonstrates to the satisfaction of the State that:
(1) Such water will not be available to children under 6 months of
age; and
(2) The non-community water system is meeting the public
notification requirements under Sec. 141.209, including continuous
posting of the fact that nitrate levels exceed 10 mg/l and the potential
health effects of exposure; and
(3) Local and State public health authorities will be notified
annually of nitrate levels that exceed 10 mg/l; and
(4) No adverse health effects shall result.
[40 FR 59570, Dec. 24, 1975, as amended at 45 FR 57342, Aug. 27, 1980;
47 FR 10998, Mar. 12, 1982; 51 FR 11410, Apr. 2, 1986; 56 FR 3578, Jan.
30, 1991; 56 FR 26548, June 7, 1991; 56 FR 30274, July 1, 1991; 56 FR
32113, July 15, 1991; 60 FR 33932, June 29, 1995; 65 FR 26022, May 4,
2000; 66 FR 7061, Jan. 22, 2001]
Sec. 141.12 [Reserved]
Sec. 141.13 Maximum contaminant levels for turbidity.
The maximum contaminant levels for turbidity are applicable to both
community water systems and non-community water systems using surface
water sources in whole or in part. The maximum contaminant levels for
turbidity in drinking water, measured at a representative entry point(s)
to the distribution system, are:
Editorial Note: At 54 FR 27527, June 29, 1989, Sec. 141.13 was
amended by adding introductory text, effective December 31, 1990.
However, introductory text already exists. The added text follows.
The requirements in this section apply to unfiltered systems until
December 30, 1991, unless the State has determined prior to that date,
in writing pursuant to Sec. 1412(b)(7)(C)(iii), that filtration is
required. The requirements in this section apply to filtered systems
until June 29, 1993. The requirements in this section apply to
unfiltered systems that the State has determined, in writing pursuant to
Sec. 1412(b)(7)(C)(iii), must install filtration, until June 29, 1993,
or until filtration is installed, whichever is later.
(a) One turbidity unit (TU), as determined by a monthly average
pursuant to Sec. 141.22, except that five or fewer turbidity units may
be allowed if the supplier of water can demonstrate to the State that
the higher turbidity does not do any of the following:
(1) Interfere with disinfection;
(2) Prevent maintenance of an effective disinfectant agent
throughout the distribution system; or
(3) Interfere with microbiological determinations.
[[Page 380]]
(b) Five turbidity units based on an average for two consecutive
days pursuant to Sec. 141.22.
[40 FR 59570, Dec. 24, 1975]
Subpart C_Monitoring and Analytical Requirements
Sec. 141.21 Coliform sampling.
(a) Routine monitoring. (1) Public water systems must collect total
coliform samples at sites which are representative of water throughout
the distribution system according to a written sample siting plan. These
plans are subject to State review and revision.
(2) The monitoring frequency for total coliforms for community water
systems is based on the population served by the system, as follows:
Total Coliform Monitoring Frequency for Community Water Systems
------------------------------------------------------------------------
Minimum
number of
Population served samples
per month
------------------------------------------------------------------------
25 to 1,000 \1\.............................................. 1
1,001 to 2,500............................................... 2
2,501 to 3,300............................................... 3
3,301 to 4,100............................................... 4
4,101 to 4,900............................................... 5
4,901 to 5,800............................................... 6
5,801 to 6,700............................................... 7
6,701 to 7,600............................................... 8
7,601 to 8,500............................................... 9
8,501 to 12,900.............................................. 10
12,901 to 17,200............................................. 15
17,201 to 21,500............................................. 20
21,501 to 25,000............................................. 25
25,001 to 33,000............................................. 30
33,001 to 41,000............................................. 40
41,001 to 50,000............................................. 50
50,001 to 59,000............................................. 60
59,001 to 70,000............................................. 70
70,001 to 83,000............................................. 80
83,001 to 96,000............................................. 90
96,001 to 130,000............................................ 100
130,001 to 220,000........................................... 120
220,001 to 320,000........................................... 150
320,001 to 450,000........................................... 180
450,001 to 600,000........................................... 210
600,001 to 780,000........................................... 240
780,001 to 970,000........................................... 270
970,001 to 1,230,000......................................... 300
1,230,001 to 1,520,000....................................... 330
1,520,001 to 1,850,000....................................... 360
1,850,001 to 2,270,000....................................... 390
2,270,001 to 3,020,000....................................... 420
3,020,001 to 3,960,000....................................... 450
3,960,001 or more............................................ 480
------------------------------------------------------------------------
\1\ Includes public water systems which have at least 15 service
connections, but serve fewer than 25 persons.
If a community water system serving 25 to 1,000 persons has no history
of total coliform contamination in its current configuration and a
sanitary survey conducted in the past five years shows that the system
is supplied solely by a protected groundwater source and is free of
sanitary defects, the State may reduce the monitoring frequency
specified above, except that in no case may the State reduce the
monitoring frequency to less than one sample per quarter. The State must
approve the reduced monitoring frequency in writing.
(3) The monitoring frequency for total coliforms for non-community
water systems is as follows:
(i) A non-community water system using only ground water (except
ground water under the direct influence of surface water, as defined in
Sec. 141.2) and serving 1,000 persons or fewer must monitor each
calendar quarter that the system provides water to the public, except
that the State may reduce this monitoring frequency, in writing, if a
sanitary survey shows that the system is free of sanitary defects.
Beginning June 29, 1994, the State cannot reduce the monitoring
frequency for a non-community water system using only ground water
(except ground water under the direct influence of surface water, as
defined in Sec. 141.2) and serving 1,000 persons or fewer to less than
once/year.
(ii) A non-community water system using only ground water (except
ground water under the direct influence of surface water, as defined in
Sec. 141.2) and serving more than 1,000 persons during any month must
monitor at the same frequency as a like-sized community water system, as
specified in paragraph (a)(2) of this section, except the State may
reduce this monitoring frequency, in writing, for any month the system
serves 1,000 persons or fewer. The State cannot reduce the monitoring
frequency to less than once/year. For systems using ground water under
the direct influence of surface water, paragraph (a)(3)(iv) of this
section applies.
(iii) A non-community water system using surface water, in total or
in part, must monitor at the same frequency as a like-sized community
water system,
[[Page 381]]
as specified in paragraph (a)(2) of this section, regardless of the
number of persons it serves.
(iv) A non-community water system using ground water under the
direct influence of surface water, as defined in Sec. 141.2, must
monitor at the same frequency as a like-sized community water system, as
specified in paragraph (a)(2) of this section. The system must begin
monitoring at this frequency beginning six months after the State
determines that the ground water is under the direct influence of
surface water.
(4) The public water system must collect samples at regular time
intervals throughout the month, except that a system which uses only
ground water (except ground water under the direct influence of surface
water, as defined in Sec. 141.2), and serves 4,900 persons or fewer,
may collect all required samples on a single day if they are taken from
different sites.
(5) A public water system that uses surface water or ground water
under the direct influence of surface water, as defined in Sec. 141.2,
and does not practice filtration in compliance with Subpart H must
collect at least one sample near the first service connection each day
the turbidity level of the source water, measured as specified in Sec.
141.74(b)(2), exceeds 1 NTU. This sample must be analyzed for the
presence of total coliforms. When one or more turbidity measurements in
any day exceed 1 NTU, the system must collect this coliform sample
within 24 hours of the first exceedance, unless the State determines
that the system, for logistical reasons outside the system's control,
cannot have the sample analyzed within 30 hours of collection. Sample
results from this coliform monitoring must be included in determining
compliance with the MCL for total coliforms in Sec. 141.63.
(6) Special purpose samples, such as those taken to determine
whether disinfection practices are sufficient following pipe placement,
replacement, or repair, shall not be used to determine compliance with
the MCL for total coliforms in Sec. 141.63. Repeat samples taken
pursuant to paragraph (b) of this section are not considered special
purpose samples, and must be used to determine compliance with the MCL
for total coliforms in Sec. 141.63.
(b) Repeat monitoring. (1) If a routine sample is total coliform-
positive, the public water system must collect a set of repeat samples
within 24 hours of being notified of the positive result. A system which
collects more than one routine sample/month must collect no fewer than
three repeat samples for each total coliform-positive sample found. A
system which collects one routine sample/month or fewer must collect no
fewer than four repeat samples for each total coliform-positive sample
found. The State may extend the 24-hour limit on a case-by-case basis if
the system has a logistical problem in collecting the repeat samples
within 24 hours that is beyond its control. In the case of an extension,
the State must specify how much time the system has to collect the
repeat samples.
(2) The system must collect at least one repeat sample from the
sampling tap where the original total coliform-positive sample was
taken, and at least one repeat sample at a tap within five service
connections upstream and at least one repeat sample at a tap within five
service connections downstream of the original sampling site. If a total
coliform-positive sample is at the end of the distribution system, or
one away from the end of the distribution system, the State may waive
the requirement to collect at least one repeat sample upstream or
downstream of the original sampling site.
(3) The system must collect all repeat samples on the same day,
except that the State may allow a system with a single service
connection to collect the required set of repeat samples over a four-day
period or to collect a larger volume repeat sample(s) in one or more
sample containers of any size, as long as the total volume collected is
at least 400 ml (300 ml for systems which collect more than one routine
sample/month).
(4) If one or more repeat samples in the set is total coliform-
positive, the public water system must collect an additional set of
repeat samples in the manner specified in paragraphs (b) (1)-(3) of this
section. The additional samples must be collected within 24 hours
[[Page 382]]
of being notified of the positive result, unless the State extends the
limit as provided in paragraph (b)(1) of this section. The system must
repeat this process until either total coliforms are not detected in one
complete set of repeat samples or the system determines that the MCL for
total coliforms in Sec. 141.63 has been exceeded and notifies the
State.
(5) If a system collecting fewer than five routine samples/month has
one or more total coliform-positive samples and the State does not
invalidate the sample(s) under paragraph (c) of this section, it must
collect at least five routine samples during the next month the system
provides water to the public, except that the State may waive this
requirement if the conditions of paragraph (b)(5) (i) or (ii) of this
section are met. The State cannot waive the requirement for a system to
collect repeat samples in paragraphs (b) (1)-(4) of this section.
(i) The State may waive the requirement to collect five routine
samples the next month the system provides water to the public if the
State, or an agent approved by the State, performs a site visit before
the end of the next month the system provides water to the public.
Although a sanitary survey need not be performed, the site visit must be
sufficiently detailed to allow the State to determine whether additional
monitoring and/or any corrective action is needed. The State cannot
approve an employee of the system to perform this site visit, even if
the employee is an agent approved by the State to perform sanitary
surveys.
(ii) The State may waive the requirement to collect five routine
samples the next month the system provides water to the public if the
State has determined why the sample was total coliform-positive and
establishes that the system has corrected the problem or will correct
the problem before the end of the next month the system serves water to
the public. In this case, the State must document this decision to waive
the following month's additional monitoring requirement in writing, have
it approved and signed by the supervisor of the State official who
recommends such a decision, and make this document available to the EPA
and public. The written documentation must describe the specific cause
of the total coliform-positive sample and what action the system has
taken and/or will take to correct this problem. The State cannot waive
the requirement to collect five routine samples the next month the
system provides water to the public solely on the grounds that all
repeat samples are total coliform-negative. Under this paragraph, a
system must still take at least one routine sample before the end of the
next month it serves water to the public and use it to determine
compliance with the MCL for total coliforms in Sec. 141.63, unless the
State has determined that the system has corrected the contamination
problem before the system took the set of repeat samples required in
paragraphs (b) (1)-(4) of this section, and all repeat samples were
total coliform-negative.
(6) After a system collects a routine sample and before it learns
the results of the analysis of that sample, if it collects another
routine sample(s) from within five adjacent service connections of the
initial sample, and the initial sample, after analysis, is found to
contain total coliforms, then the system may count the subsequent
sample(s) as a repeat sample instead of as a routine sample.
(7) Results of all routine and repeat samples not invalidated by the
State must be included in determining compliance with the MCL for total
coliforms in Sec. 141.63.
(c) Invalidation of total coliform samples. A total coliform-
positive sample invalidated under this paragraph (c) does not count
towards meeting the minimum monitoring requirements of this section.
(1) The State may invalidate a total coliform-positive sample only
if the conditions of paragraph (c)(1) (i), (ii), or (iii) of this
section are met.
(i) The laboratory establishes that improper sample analysis caused
the total coliform-positive result.
(ii) The State, on the basis of the results of repeat samples
collected as required by paragraphs (b) (1) through (4) of this section,
determines that the total coliform-positive sample resulted from a
domestic or other non-distribution system plumbing problem. The
[[Page 383]]
State cannot invalidate a sample on the basis of repeat sample results
unless all repeat sample(s) collected at the same tap as the original
total coliform-positive sample are also total coliform-positive, and all
repeat samples collected within five service connections of the original
tap are total coliform-negative (e.g., a State cannot invalidate a total
coliform-positive sample on the basis of repeat samples if all the
repeat samples are total coliform-negative, or if the public water
system has only one service connection).
(iii) The State has substantial grounds to believe that a total
coliform-positive result is due to a circumstance or condition which
does not reflect water quality in the distribution system. In this case,
the system must still collect all repeat samples required under
paragraphs (b) (1)-(4) of this section, and use them to determine
compliance with the MCL for total coliforms in Sec. 141.63. To
invalidate a total coliform-positive sample under this paragraph, the
decision with the rationale for the decision must be documented in
writing, and approved and signed by the supervisor of the State official
who recommended the decision. The State must make this document
available to EPA and the public. The written documentation must state
the specific cause of the total coliform-positive sample, and what
action the system has taken, or will take, to correct this problem. The
State may not invalidate a total coliform-positive sample solely on the
grounds that all repeat samples are total coliform-negative.
(2) A laboratory must invalidate a total coliform sample (unless
total coliforms are detected) if the sample produces a turbid culture in
the absence of gas production using an analytical method where gas
formation is examined (e.g., the Multiple-Tube Fermentation Technique),
produces a turbid culture in the absence of an acid reaction in the
Presence-Absence (P-A) Coliform Test, or exhibits confluent growth or
produces colonies too numerous to count with an analytical method using
a membrane filter (e.g., Membrane Filter Technique). If a laboratory
invalidates a sample because of such interference, the system must
collect another sample from the same location as the original sample
within 24 hours of being notified of the interference problem, and have
it analyzed for the presence of total coliforms. The system must
continue to re-sample within 24 hours and have the samples analyzed
until it obtains a valid result. The State may waive the 24-hour time
limit on a case-by-case basis.
(d) Sanitary surveys. (1)(i) Public water systems which do not
collect five or more routine samples/month must undergo an initial
sanitary survey by June 29, 1994, for community public water systems and
June 29, 1999, for non-community water systems. Thereafter, systems must
undergo another sanitary survey every five years, except that non-
community water systems using only protected and disinfected ground
water, as defined by the State, must undergo subsequent sanitary surveys
at least every ten years after the initial sanitary survey. The State
must review the results of each sanitary survey to determine whether the
existing monitoring frequency is adequate and what additional measures,
if any, the system needs to undertake to improve drinking water quality.
(ii) In conducting a sanitary survey of a system using ground water
in a State having an EPA-approved wellhead protection program under
section 1428 of the Safe Drinking Water Act, information on sources of
contamination within the delineated wellhead protection area that was
collected in the course of developing and implementing the program
should be considered instead of collecting new information, if the
information was collected since the last time the system was subject to
a sanitary survey.
(2) Sanitary surveys must be performed by the State or an agent
approved by the State. The system is responsible for ensuring the survey
takes place.
(3) Sanitary surveys conducted by the State under the provisions of
Sec. 142.16(o)(2) of this chapter may be used to meet the sanitary
survey requirements of this section.
(e) Fecal coliforms/Escherichia coli (E. coli) testing. (1) If any
routine or repeat
[[Page 384]]
sample is total coliform-positive, the system must analyze that total
coliform-positive culture medium to determine if fecal coliforms are
present, except that the system may test for E. coli in lieu of fecal
coliforms. If fecal coliforms or E. coli are present, the system must
notify the State by the end of the day when the system is notified of
the test result, unless the system is notified of the result after the
State office is closed, in which case the system must notify the State
before the end of the next business day.
(2) The State has the discretion to allow a public water system, on
a case-by-case basis, to forgo fecal coliform or E. coli testing on a
total coliform-positive sample if that system assumes that the total
coliform-positive sample is fecal coliform-positive or E. coli-positive.
Accordingly, the system must notify the State as specified in paragraph
(e)(1) of this section and the provisions of Sec. 141.63(b) apply.
(f) Analytical methodology. (1) The standard sample volume required
for total coliform analysis, regardless of analytical method used, is
100 ml.
(2) Public water systems need only determine the presence or absence
of total coliforms; a determination of total coliform density is not
required.
(3) Public water systems must conduct total coliform analyses in
accordance with one of the analytical methods in the following table or
one of the alternative methods listed in appendix A to subpart C of this
part.
----------------------------------------------------------------------------------------------------------------
Organism Methodology \12\ Citation \1\
----------------------------------------------------------------------------------------------------------------
Total Coliforms \2\................... Total Coliform Fermentation Technique 9221A, B.
\3,4,5\.
Total Coliform Membrane Filter Technique 9222A, B, C.
\6\.
Presence-Absence (P-A) Coliform Test 9221D.
\5,7\.
ONPG-MUG Test \8\....................... 9223.
Colisure Test. \9\
E*Colite [reg] Test. \10\
m-ColiBlue24 [reg] Test. \11\
Readycult [reg] Coliforms 100 Presence/
Absence Test. \13\
Membrane Filter Technique using
Chromocult [reg] Coliform Agar. \14\
Colitag [reg] Test. \15\
----------------------------------------------------------------------------------------------------------------
The procedures shall be done in accordance with the documents listed below. The incorporation by reference of
the following documents listed in footnotes 1, 6, 8, 9, 10 , 11, 13, 14 and 15 was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the documents may be
obtained from the sources listed below. Information regarding obtaining these documents can be obtained from
the Safe Drinking Water Hotline at 800-426-4791. Documents may be inspected at EPA's Drinking Water Docket,
EPA West, 1301 Constitution Avenue, NW., EPA West, Room B102, Washington DC 20460 (Telephone: 202-566-2426);
or at the National Archives and Records Administration (NARA). For information on the availability of this
material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal--register/code--of--federal--
regulations/ibr--locations.html.
\1\ Standard Methods for the Examination of Water and Wastewater, 18th edition (1992), 19th edition (1995), or
20th edition (1998). American Public Health Association, 1015 Fifteenth Street, NW., Washington, DC 20005. The
cited methods published in any of these three editions may be used. In addition, the following online versions
may also be used: 9221 A, B, D-99, 9222 A, B, C-97, and 9223 B-97. Standard Methods Online are available at
http://www.standardmethods.org. The year in which each method was approved by the Standard Methods Committee
is designated by the last two digits in the method number. The methods listed are the only Online versions
that may be used.
\2\ The time from sample collection to initiation of analysis may not exceed 30 hours. Systems are encouraged
but not required to hold samples below 10 deg. C during transit.
\3\ Lactose broth, as commercially available, may be used in lieu of lauryl tryptose broth, if the system
conducts at least 25 parallel tests between this medium and lauryl tryptose broth using the water normally
tested, and this comparison demonstrates that the false-positive rate and false-negative rate for total
coliform, using lactose broth, is less than 10 percent.
\4\ If inverted tubes are used to detect gas production, the media should cover these tubes at least one-half to
two-thirds after the sample is added.
\5\ No requirement exists to run the completed phase on 10 percent of all total coliform-positive confirmed
tubes.
\6\ MI agar also may be used. Preparation and use of MI agar is set forth in the article, ``New medium for the
simultaneous detection of total coliform and Escherichia coli in water'' by Brenner, K.P., et. al., 1993,
Appl. Environ. Microbiol. 59:3534-3544. Also available from the Office of Water Resource Center (RC-4100T),
1200 Pennsylvania Avenue, NW., Washington, DC 20460, EPA/600/J-99/225. Verification of colonies is not
required.
\7\ Six-times formulation strength may be used if the medium is filter-sterilized rather than autoclaved.
\8\ The ONPG-MUG Test is also known as the Autoanalysis Collect System.
\9\ A description of the Colisure Test, Feb 28, 1994, may be obtained from IDEXX Laboratories, Inc., One IDEXX
Drive, Westbrook, Maine 04092. The Colisure Test may be read after an incubation time of 24 hours.
\10\ A description of the E*Colite [reg] Test, ``Presence/Absence for Coliforms and E. Coli in Water,'' Dec 21,
1997, is available from Charm Sciences, Inc., 36 Franklin Street, Malden, MA 02148-4120.
\11\ A description of the m-ColiBlue24 [reg] Test, Aug 17, 1999, is available from the Hach Company, 100 Dayton
Avenue, Ames, IA 50010.
\12\ EPA strongly recommends that laboratories evaluate the false-positive and negative rates for the method(s)
they use for monitoring total coliforms. EPA also encourages laboratories to establish false-positive and
false-negative rates within their own laboratory and sample matrix (drinking water or source water) with the
intent that if the method they choose has an unacceptable false-positive or negative rate, another method can
be used. The Agency suggests that laboratories perform these studies on a minimum of 5% of all total coliform-
positive samples, except for those methods where verification/confirmation is already required, e.g., the M-
Endo and LES Endo Membrane Filter Tests, Standard Total Coliform Fermentation Technique, and Presence-Absence
Coliform Test. Methods for establishing false-positive and negative-rates may be based on lactose
fermentation, the rapid test for [beta]-galactosidase and cytochrome oxidase, multi-test identification
systems, or equivalent confirmation tests. False-positive and false-negative information is often available in
published studies and/or from the manufacturer(s).
[[Page 385]]
\13\ The Readycult [reg] Coliforms 100 Presence/Absence Test is described in the document, ``Readycult [reg]
Coliforms 100 Presence/Absence Test for Detection and Identification of Coliform Bacteria and Escherichla coli
in Finished Waters'', November 2000, Version 1.0, available from EM Science (an affiliate of Merck KGgA,
Darmstadt Germany), 480 S. Democrat Road, Gibbstown, NJ 08027-1297. Telephone number is (800) 222-0342, e-mail
address is: [email protected].
\14\ Membrane Filter Technique using Chromocult [reg] Coliform Agar is described in the document, ``Chromocult
[reg] Coliform Agar Presence/Absence Membrane Filter Test Method for Detection and Identification of Coliform
Bacteria and Escherichla coli in Finished Waters'', November 2000, Version 1.0, available from EM Science (an
affiliate of Merck KGgA, Darmstadt Germany), 480 S. Democrat Road, Gibbstown, NJ 08027-1297. Telephone number
is (800) 222-0342, e-mail address is: [email protected].
\15\ Colitag [reg] product for the determination of the presence/absence of total coliforms and E. coli is
described in ``Colitag [reg] Product as a Test for Detection and Identification of Coliforms and E. coli
Bacteria in Drinking Water and Source Water as Required in National Primary Drinking Water Regulations,''
August 2001, available from CPI International, Inc., 5580 Skylane Blvd., Santa Rosa, CA, 95403, telephone
(800) 878-7654, Fax (707) 545-7901, Internet address http://www.cpiinternational.com.
(4) [Reserved]
(5) Public water systems must conduct fecal coliform analysis in
accordance with the following procedure. When the MTF Technique or
Presence-Absence (PA) Coliform Test is used to test for total coliforms,
shake the lactose-positive presumptive tube or P-A vigorously and
transfer the growth with a sterile 3-mm loop or sterile applicator stick
into brilliant green lactose bile broth and EC medium to determine the
presence of total and fecal coliforms, respectively. For EPA-approved
analytical methods which use a membrane filter, transfer the total
coliform-positive culture by one of the following methods: remove the
membrane containing the total coliform colonies from the substrate with
a sterile forceps and carefully curl and insert the membrane into a tube
of EC medium (the laboratory may first remove a small portion of
selected colonies for verification), swab the entire membrane filter
surface with a sterile cotton swab and transfer the inoculum to EC
medium (do not leave the cotton swab in the EC medium), or inoculate
individual total coliform-positive colonies into EC Medium. Gently shake
the inoculated tubes of EC medium to insure adequate mixing and incubate
in a waterbath at 44.5 0.2 [deg]C for 24 2 hours. Gas production of any amount in the inner
fermentation tube of the EC medium indicates a positive fecal coliform
test. The preparation of EC medium is described in Method 9221E
(paragraph 1a) in Standard Methods for the Examination of Water and
Wastewater, 18th edition (1992), 19th edition (1995), and 20th edition
(1998); the cited method in any one of these three editions may be used.
Public water systems need only determine the presence or absence of
fecal coliforms; a determination of fecal coliform density is not
required.
(6) Public water systems must conduct analysis of Escherichia coli
in accordance with one of the following analytical methods or one of the
alternative methods listed in appendix A to subpart C of this part.
(i) EC medium supplemented with 50 [micro]g/mL of 4-
methylumbelliferyl-beta-D-glucuronide (MUG) (final concentration), as
described in Method 9222G in Standard Methods for the Examination of
Water and Wastewater, 19th edition (1995) and 20th edition (1998).
Either edition may be used. Alternatively, the 18th edition (1992) may
be used if at least 10 mL of EC medium, as described in paragraph (f)(5)
of this section, is supplemented with 50 [micro]g/mL of MUG before
autoclaving. The inner inverted fermentation tube may be omitted. If the
18th edition is used, apply the procedure in paragraph (f)(5) of this
section for transferring a total coliform-positive culture to EC medium
supplemented with MUG, incubate the tube at 44.5 0.2 [deg]C for 24 2 hours, and
then observe fluorescence with an ultraviolet light (366 nm) in the
dark. If fluorescence is visible, E. coli are present.
(ii) Nutrient agar supplemented with 100 [micro]g/mL of 4-
methylumbelliferyl-beta-D-glucuronide (MUG) (final concentration), as
described in Method 9222G in Standard Methods for the Examination of
Water and Wastewater, 19th edition (1995) and 20th edition (1998).
Either edition may be used for determining if a total coliform-positive
sample, as determined by a membrane filter technique, contains E. coli.
Alternatively, the 18th edition (1992) may be used if the membrane
filter containing a total coliform-positive colony(ies) is transferred
to nutrient agar, as described in Method 9221B (paragraph 3) of Standard
Methods (18th edition), supplemented with 100 [micro]g/mL of
[[Page 386]]
MUG. If the 18th edition is used, incubate the agar plate at 35 [deg]C
for 4 hours and then observe the colony(ies) under ultraviolet light
(366 nm) in the dark for fluorescence. If fluorescence is visible, E.
coli are present.
(iii) Minimal Medium ONPG-MUG (MMO-MUG) Test, as set forth in the
article ``National Field Evaluation of a Defined Substrate Method for
the Simultaneous Detection of Total Coliforms and Escherichia coli from
Drinking Water: Comparison with Presence-Absence Techniques'' (Edberg et
al.), Applied and Environmental Microbiology, Volume 55, pp. 1003-1008,
April 1989. (Note: The Autoanalysis Colilert System is an MMO-MUG test).
If the MMO-MUG test is total coliform-positive after a 24-hour
incubation, test the medium for fluorescence with a 366-nm ultraviolet
light (preferably with a 6-watt lamp) in the dark. If fluorescence is
observed, the sample is E. coli-positive. If fluorescence is
questionable (cannot be definitively read) after 24 hours incubation,
incubate the culture for an additional four hours (but not to exceed 28
hours total), and again test the medium for fluorescence. The MMO-MUG
Test with hepes buffer in lieu of phosphate buffer is the only approved
formulation for the detection of E. coli.
(iv) The Colisure Test. A description of the Colisure Test may be
obtained from the Millipore Corporation, Technical Services Department,
80 Ashby Road, Bedford, MA 01730.
(v) The membrane filter method with MI agar, a description of which
is cited in footnote 6 to the table in paragraph (f)(3) of this section.
(vi) E*Colite [reg] Test, a description of which is cited
in footnote 10 to the table at paragraph (f)(3) of this section.
(vii) m-ColiBlue24 [reg] Test, a description of which is
cited in footnote 11 to the table in paragraph (f)(3) of this section.
(viii) Readycult [reg] Coliforms 100 Presence/Absence
Test, a description of which is cited in footnote 13 to the table at
paragraph (f)(3) of this section.
(ix) Membrane Filter Technique using Chromocult [reg]
Coliform Agar, a description of which is cited in footnote 14 to the
table at paragraph (f)(3) of this section.
(x) Colitag [reg], a description of which is cited in
footnote 15 to the table at paragraph (f)(3) of this section.
(7) As an option to paragraph (f)(6)(iii) of this section, a system
with a total coliform-positive, MUG-negative, MMO-MUG test may further
analyze the culture for the presence of E. coli by transferring a 0.1
ml, 28-hour MMO-MUG culture to EC Medium + MUG with a pipet. The
formulation and incubation conditions of EC Medium + MUG, and
observation of the results are described in paragraph (f)(6)(i) of this
section.
(8) The following materials are incorporated by reference in this
section with the approval of the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the
analytical methods cited in Standard Methods for the Examination of
Water and Wastewater (18th, 19th, and 20th editions) may be obtained
from the American Public Health Association et al.; 1015 Fifteenth
Street, NW., Washington, DC 20005-2605. Copies of the MMO-MUG Test, as
set forth in the article ``National Field Evaluation of a Defined
Substrate Method for the Simultaneous Enumeration of Total Coliforms and
Escherichia coli from Drinking Water: Comparison with the Standard
Multiple Tube Fermentation Method'' (Edberg et al.) may be obtained from
the American Water Works Association Research Foundation, 6666 West
Quincy Avenue, Denver, CO 80235. Copies of the MMO-MUG Test as set forth
in the article ``National Field Evaluation of a Defined Substrate Method
for the Simultaneous Enumeration of Total Coliforms and Escherichia coli
from Drinking Water: Comparison with the Standard Multiple Tube
Fermentation Method'' (Edberg et al.) may be obtained from the American
Water Works Association Research Foundation, 6666 West Quincy Avenue,
Denver, CO 80235. A description of the Colisure Test may be obtained
from the Millipore Corp., Technical Services Department, 80 Ashby Road,
Bedford, MA 01730. Copies may be inspected at EPA's Drinking Water
Docket; 401 M St., SW.; Washington, DC 20460, or at the National
Archives and Records Administration (NARA). For information on the
availability of
[[Page 387]]
this material at NARA, call 202-741-6030, or go to: http://
www.archives.gov/federal--register/code--of--federal--regulations/ibr--
locations.html.
(g) Response to violation. (1) A public water system which has
exceeded the MCL for total coliforms in Sec. 141.63 must report the
violation to the State no later than the end of the next business day
after it learns of the violation, and notify the public in accordance
with subpart Q.
(2) A public water system which has failed to comply with a coliform
monitoring requirement, including the sanitary survey requirement, must
report the monitoring violation to the State within ten days after the
system discovers the violation, and notify the public in accordance with
subpart Q.
[54 FR 27562, June 29, 1989]
Editorial Note: For Federal Register citations affecting Sec.
141.21, see the List of CFR Sections Affected, which appears in the
Finding Aids section of the printed volume and on GPO Access.
Sec. 141.22 Turbidity sampling and analytical requirements.
The requirements in this section apply to unfiltered systems until
December 30, 1991, unless the State has determined prior to that date,
in writing pursuant to section 1412(b)(7)(iii), that filtration is
required. The requirements in this section apply to filtered systems
until June 29, 1993. The requirements in this section apply to
unfiltered systems that the State has determined, in writing pursuant to
section 1412(b)(7)(C)(iii), must install filtration, until June 29,
1993, or until filtration is installed, whichever is later.
(a) Samples shall be taken by suppliers of water for both community
and non-community water systems at a representative entry point(s) to
the water distribution system at least once per day, for the purposes of
making turbidity measurements to determine compliance with Sec. 141.13.
If the State determines that a reduced sampling frequency in a non-
community will not pose a risk to public health, it can reduce the
required sampling frequency. The option of reducing the turbidity
frequency shall be permitted only in those public water systems that
practice disinfection and which maintain an active residual disinfectant
in the distribution system, and in those cases where the State has
indicated in writing that no unreasonable risk to health existed under
the circumstances of this option. Turbidity measurements shall be made
as directed in Sec. 141.74(a)(1).
(b) If the result of a turbidity analysis indicates that the maximum
allowable limit has been exceeded, the sampling and measurement shall be
confirmed by resampling as soon as practicable and preferably within one
hour. If the repeat sample confirms that the maximum allowable limit has
been exceeded, the supplier of water shall report to the State within 48
hours. The repeat sample shall be the sample used for the purpose of
calculating the monthly average. If the monthly average of the daily
samples exceeds the maximum allowable limit, or if the average of two
samples taken on consecutive days exceeds 5 TU, the supplier of water
shall report to the State and notify the public as directed in Sec.
141.31 and subpart Q.
(c) Sampling for non-community water systems shall begin within two
years after the effective date of this part.
(d) The requirements of this Sec. 141.22 shall apply only to public
water systems which use water obtained in whole or in part from surface
sources.
(e) The State has the authority to determine compliance or initiate
enforcement action based upon analytical results or other information
compiled by their sanctioned representatives and agencies.
[40 FR 59570, Dec. 24, 1975, as amended at 45 FR 57344, Aug. 27, 1980;
47 FR 8998, Mar. 3, 1982; 47 FR 10998, Mar. 12, 1982; 54 FR 27527, June
29, 1989; 59 FR 62466, Dec. 5, 1994; 65 FR 26022, May 4, 2000]
Sec. 141.23 Inorganic chemical sampling and analytical requirements.
Community water systems shall conduct monitoring to determine
compliance with the maximum contaminant levels specified in Sec. 141.62
in accordance with this section. Non-transient, non-community water
systems shall conduct monitoring to determine compliance with the
maximum contaminant levels specified in Sec. 141.62 in accordance
[[Page 388]]
with this section. Transient, non-community water systems shall conduct
monitoring to determine compliance with the nitrate and nitrite maximum
contaminant levels in Sec. Sec. 141.11 and 141.62 (as appropriate) in
accordance with this section.
(a) Monitoring shall be conducted as follows:
(1) Groundwater systems shall take a minimum of one sample at every
entry point to the distribution system which is representative of each
well after treatment (hereafter called a sampling point) beginning in
the initial compliance period. The system shall take each sample at the
same sampling point unless conditions make another sampling point more
representative of each source or treatment plant.
(2) Surface water systems shall take a minimum of one sample at
every entry point to the distribution system after any application of
treatment or in the distribution system at a point which is
representative of each source after treatment (hereafter called a
sampling point) beginning in the initial compliance period. The system
shall take each sample at the same sampling point unless conditions make
another sampling point more representative of each source or treatment
plant.
Note: For purposes of this paragraph, surface water systems include
systems with a combination of surface and ground sources.
(3) If a system draws water from more than one source and the
sources are combined before distribution, the system must sample at an
entry point to the distribution system during periods of normal
operating conditions (i.e., when water is representative of all sources
being used).
(4) The State may reduce the total number of samples which must be
analyzed by allowing the use of compositing. Composite samples from a
maximum of five samples are allowed, provided that the detection limit
of the method used for analysis is less than one-fifth of the MCL.
Compositing of samples must be done in the laboratory.
(i) If the concentration in the composite sample is greater than or
equal to one-fifth of the MCL of any inorganic chemical, then a follow-
up sample must be taken within 14 days at each sampling point included
in the composite. These samples must be analyzed for the contaminants
which exceeded one-fifth of the MCL in the composite sample. Detection
limits for each analytical method and MCLs for each inorganic
contaminant are the following:
Detection Limits for Inorganic Contaminants
------------------------------------------------------------------------
Detection
Contaminant MCL (mg/l) Methodology limit (mg/l)
------------------------------------------------------------------------
Antimony.................. 0.006...... Atomic 0.003
Absorption;
Furnace.
Atomic 0.0008 \5\
Absorption;
Platform.
ICP-Mass 0.0004
Spectrometry.
Hydride-Atomic 0.001
Absorption.
Arsenic................... 0.010 \6\.. Atomic 0.001
Absorption;
Furnace.
Atomic 0.0005 \7\
Absorption;
Platform--Stabi
lized
Temperature.
Atomic 0.001
Absorption;
Gaseous Hydride.
ICP-Mass 0.0014 \8\
Spectrometry.
Asbestos.................. 7 MFL \1\.. Transmission 0.01 MFL
Electron
Microscopy.
Barium.................... 2.......... Atomic 0.002
Absorption;
furnace
technique.
Atomic 0.1
Absorption;
direct
aspiration.
Inductively 0.002 (0.001)
Coupled Plasma.
Beryllium................. 0.004...... Atomic 0.0002
Absorption;
Furnace.
Atomic 0.00002 \5\
Absorption;
Platform.
Inductively 0.0003
Coupled Plasma
\2\.
ICP-Mass 0.0003
Spectrometry.
Cadmium................... 0.005...... Atomic 0.0001
Absorption;
furnace
technique.
Inductively 0.001
Coupled Plasma.
Chromium.................. 0.1........ Atomic 0.001
Absorption;
furnace
technique.
Inductively 0.007 (0.001)
Coupled Plasma.
Cyanide................... 0.2........ Distillation, 0.02
Spectrophotomet
ric \3\.
........... Distillation, 0.005
Automated,
Spectrophotomet
ric \3\.
........... Distillation, 0.02
Amenable,
Spectrophotomet
ric \4\.
........... Distillation, 0.05
Selective
Electrode3, 4.
........... UV, 0.0005
Distillation,
Spectrophotomet
ric \9\.
........... Micro 0.0006
Distillation,
Flow Injection,
Spectrophotomet
ric \3\.
........... Ligand Exchange 0.0005
with
Amperometry \4\.
[[Page 389]]
Mercury................... 0.002...... Manual Cold 0.0002
Vapor Technique.
Automated Cold 0.0002
Vapor Technique.
Nickel.................... xl......... Atomic 0.001
Absorption;
Furnace.
Atomic 0.0006 \5\
Absorption;
Platform.
Inductively 0.005
Coupled Plasma
\2\.
ICP-Mass 0.0005
Spectrometry.
Nitrate................... 10 (as N).. Manual Cadmium 0.01
Reduction.
Automated 0.01
Hydrazine
Reduction.
Automated 0.05
Cadmium
Reduction.
Ion Selective 1
Electrode.
Ion 0.01
Chromatography.
Capillary Ion 0.076
Electrophoresis.
Nitrite................... 1 (as N)... Spectrophotometr 0.01
ic.
Automated 0.05
Cadmium
Reduction.
Manual Cadmium 0.01
Reduction.
Ion 0.004
Chromatography.
Capillary Ion 0.103
Electrophoresis.
Selenium.................. 0.05....... Atomic 0.002
Absorption;
furnace.
Atomic 0.002
Absorption;
gaseous hydride.
Thallium.................. 0.002...... Atomic 0.001
Absorption;
Furnace.
Atomic 0.0007 \5\
Absorption;
Platform.
ICP-Mass 0.0003
Spectrometry.
------------------------------------------------------------------------
\1\ MFL = million fibers per liter 10 [micro]m.
\2\ Using a 2X preconcentration step as noted in Method 200.7. Lower
MDLs may be achieved when using a 4X preconcentration.
\3\ Screening method for total cyanides.
\4\ Measures ``free'' cyanides when distillation, digestion, or ligand
exchange is omitted.
\5\ Lower MDLs are reported using stabilized temperature graphite
furnace atomic absorption.
\6\ The value for arsenic is effective January 23, 2006. Unit then, the
MCL is 0.05 mg/L.
\7\ The MDL reported for EPA method 200.9 (Atomic Absorption; Platform--
Stablized Temperature) was determined using a 2x concentration step
during sample digestion. The MDL determined for samples analyzed using
direct analyses (i.e., no sample digestion) will be higher. Using
multiple depositions, EPA 200.9 is capable of obtaining MDL of 0.0001
mg/L.
\8\ Using selective ion monitoring, EPA Method 200.8 (ICP-MS) is capable
of obtaining a MDL of 0.0001 mg/L.
\9\ Measures total cyanides when UV-digestor is used, and ``free''
cyanides when UV-digestor is bypassed.
(ii) If the population served by the system is 3,300
persons, then compositing may only be permitted by the State at sampling
points within a single system. In systems serving <=3,300 persons, the
State may permit compositing among different systems provided the 5-
sample limit is maintained.
(iii) If duplicates of the original sample taken from each sampling
point used in the composite sample are available, the system may use
these instead of resampling. The duplicates must be analyzed and the
results reported to the State within 14 days after completing analysis
of the composite sample, provided the holding time of the sample is not
exceeded.
(5) The frequency of monitoring for asbestos shall be in accordance
with paragraph (b) of this section: the frequency of monitoring for
antimony, arsenic, barium, beryllium, cadmium, chromium, cyanide,
fluoride, mercury, nickel, selenium and thallium shall be in accordance
with paragraph (c) of this section; the frequency of monitoring for
nitrate shall be in accordance with paragraph (d) of this section; and
the frequency of monitoring for nitrite shall be in accordance with
paragraph (e) of this section.
(b) The frequency of monitoring conducted to determine compliance
with the maximum contaminant level for asbestos specified in Sec.
141.62(b) shall be conducted as follows:
(1) Each community and non-transient, non-community water system is
required to monitor for asbestos during the first three-year compliance
period of each nine-year compliance cycle beginning in the compliance
period starting January 1, 1993.
(2) If the system believes it is not vulnerable to either asbestos
contamination in its source water or due to corrosion of asbestos-cement
pipe, or both, it may apply to the State for a waiver of the monitoring
requirement in paragraph (b)(1) of this section. If the State grants the
waiver, the system is not required to monitor.
[[Page 390]]
(3) The State may grant a waiver based on a consideration of the
following factors:
(i) Potential asbestos contamination of the water source, and
(ii) The use of asbestos-cement pipe for finished water distribution
and the corrosive nature of the water.
(4) A waiver remains in effect until the completion of the three-
year compliance period. Systems not receiving a waiver must monitor in
accordance with the provisions of paragraph (b)(1) of this section.
(5) A system vulnerable to asbestos contamination due solely to
corrosion of asbestos-cement pipe shall take one sample at a tap served
by asbestos-cement pipe and under conditions where asbestos
contamination is most likely to occur.
(6) A system vulnerable to asbestos contamination due solely to
source water shall monitor in accordance with the provision of paragraph
(a) of this section.
(7) A system vulnerable to asbestos contamination due both to its
source water supply and corrosion of asbestos-cement pipe shall take one
sample at a tap served by asbestos-cement pipe and under conditions
where asbestos contamination is most likely to occur.
(8) A system which exceeds the maximum contaminant levels as
determined in Sec. 141.23(i) of this section shall monitor quarterly
beginning in the next quarter after the violation occurred.
(9) The State may decrease the quarterly monitoring requirement to
the frequency specified in paragraph (b)(1) of this section provided the
State has determined that the system is reliably and consistently below
the maximum contaminant level. In no case can a State make this
determination unless a groundwater system takes a minimum of two
quarterly samples and a surface (or combined surface/ground) water
system takes a minimum of four quarterly samples.
(10) If monitoring data collected after January 1, 1990 are
generally consistent with the requirements of Sec. 141.23(b), then the
State may allow systems to use that data to satisfy the monitoring
requirement for the initial compliance period beginning January 1, 1993.
(c) The frequency of monitoring conducted to determine compliance
with the maximum contaminant levels in Sec. 141.62 for antimony,
arsenic, barium, beryllium, cadmium, chromium, cyanide, fluoride,
mercury, nickel, selenium and thallium shall be as follows:
(1) Groundwater systems shall take one sample at each sampling point
during each compliance period. Surface water systems (or combined
surface/ground) shall take one sample annually at each sampling point.
(2) The system may apply to the State for a waiver from the
monitoring frequencies specified in paragraph (c)(1) of this section.
States may grant a public water system a waiver for monitoring of
cyanide, provided that the State determines that the system is not
vulnerable due to lack of any industrial source of cyanide.
(3) A condition of the waiver shall require that a system shall take
a minimum of one sample while the waiver is effective. The term during
which the waiver is effective shall not exceed one compliance cycle
(i.e., nine years).
(4) The State may grant a waiver provided surface water systems have
monitored annually for at least three years and groundwater systems have
conducted a minimum of three rounds of monitoring. (At least one sample
shall have been taken since January 1, 1990). Both surface and
groundwater systems shall demonstrate that all previous analytical
results were less than the maximum contaminant level. Systems that use a
new water source are not eligible for a waiver until three rounds of
monitoring from the new source have been completed.
(5) In determining the appropriate reduced monitoring frequency, the
State shall consider:
(i) Reported concentrations from all previous monitoring;
(ii) The degree of variation in reported concentrations; and
(iii) Other factors which may affect contaminant concentrations such
as changes in groundwater pumping rates, changes in the system's
configuration, changes in the system's operating procedures, or changes
in stream flows or characteristics.
[[Page 391]]
(6) A decision by the State to grant a waiver shall be made in
writing and shall set forth the basis for the determination. The
determination may be initiated by the State or upon an application by
the public water system. The public water system shall specify the basis
for its request. The State shall review and, where appropriate, revise
its determination of the appropriate monitoring frequency when the
system submits new monitoring data or when other data relevant to the
system's appropriate monitoring frequency become available.
(7) Systems which exceed the maximum contaminant levels as
calculated in Sec. 141.23(i) of this section shall monitor quarterly
beginning in the next quarter after the violation occurred.
(8) The State may decrease the quarterly monitoring requirement to
the frequencies specified in paragraphs (c)(1) and (c)(2) of this
section provided it has determined that the system is reliably and
consistently below the maximum contaminant level. In no case can a State
make this determination unless a groundwater system takes a minimum of
two quarterly samples and a surface water system takes a minimum of four
quarterly samples.
(9) All new systems or systems that use a new source of water that
begin operation after January 22, 2004 must demonstrate compliance with
the MCL within a period of time specified by the State. The system must
also comply with the initial sampling frequencies specified by the State
to ensure a system can demonstrate compliance with the MCL. Routine and
increased monitoring frequencies shall be conducted in accordance with
the requirements in this section.
(d) All public water systems (community; non-transient, non-
community; and transient, non-community systems) shall monitor to
determine compliance with the maximum contaminant level for nitrate in
Sec. 141.62.
(1) Community and non-transient, non-community water systems served
by groundwater systems shall monitor annually beginning January 1, 1993;
systems served by surface water shall monitor quarterly beginning
January 1, 1993.
(2) For community and non-transient, non-community water systems,
the repeat monitoring frequency for groundwater systems shall be
quarterly for at least one year following any one sample in which the
concentration is =50 percent of the MCL. The State may allow
a groundwater system to reduce the sampling frequency to annually after
four consecutive quarterly samples are reliably and consistently less
than the MCL.
(3) For community and non-transient, non-community water systems,
the State may allow a surface water system to reduce the sampling
frequency to annually if all analytical results from four consecutive
quarters are <50 percent of the MCL. A surface water system shall return
to quarterly monitoring if any one sample is =50 percent of
the MCL.
(4) Each transient non-community water system shall monitor annually
beginning January 1, 1993.
(5) After the initial round of quarterly sampling is completed, each
community and non-transient non-community system which is monitoring
annually shall take subsequent samples during the quarter(s) which
previously resulted in the highest analytical result.
(e) All public water systems (community; non-transient, non-
community; and transient, non-community systems) shall monitor to
determine compliance with the maximum contaminant level for nitrite in
Sec. 141.62(b).
(1) All public water systems shall take one sample at each sampling
point in the compliance period beginning January 1, 1993 and ending
December 31, 1995.
(2) After the initial sample, systems where an analytical result for
nitrite is <50 percent of the MCL shall monitor at the frequency
specified by the State.
(3) For community, non-transient, non-community, and transient non-
community water systems, the repeat monitoring frequency for any water
system shall be quarterly for at least one year following any one sample
in which the concentration is [gteqt]50 percent of the MCL. The State
may allow a system to reduce the sampling frequency to annually after
determining the system is reliably and consistently less than the MCL.
[[Page 392]]
(4) Systems which are monitoring annually shall take each subsequent
sample during the quarter(s) which previously resulted in the highest
analytical result.
(f) Confirmation samples:
(1) Where the results of sampling for antimony, arsenic, asbestos,
barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury,
nickel, selenium or thallium indicate an exceedance of the maximum
contaminant level, the State may require that one additional sample be
collected as soon as possible after the initial sample was taken (but
not to exceed two weeks) at the same sampling point.
(2) Where nitrate or nitrite sampling results indicate an exceedance
of the maximum contaminant level, the system shall take a confirmation
sample within 24 hours of the system's receipt of notification of the
analytical results of the first sample. Systems unable to comply with
the 24-hour sampling requirement must immediately notify persons served
by the public water system in accordance with Sec. 141.202 and meet
other Tier 1 public notification requirements under Subpart Q of this
part. Systems exercising this option must take and analyze a
confirmation sample within two weeks of notification of the analytical
results of the first sample.
(3) If a State-required confirmation sample is taken for any
contaminant, then the results of the initial and confirmation sample
shall be averaged. The resulting average shall be used to determine the
system's compliance in accordance with paragraph (i) of this section.
States have the discretion to delete results of obvious sampling errors.
(g) The State may require more frequent monitoring than specified in
paragraphs (b), (c), (d) and (e) of this section or may require
confirmation samples for positive and negative results at its
discretion.
(h) Systems may apply to the State to conduct more frequent
monitoring than the minimum monitoring frequencies specified in this
section.
(i) Compliance with Sec. Sec. 141.11 or 141.62(b) (as appropriate)
shall be determined based on the analytical result(s) obtained at each
sampling point.
(1) For systems which are conducting monitoring at a frequency
greater than annual, compliance with the maximum contaminant levels for
antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium,
cyanide, fluoride, mercury, nickel, selenium or thallium is determined
by a running annual average at any sampling point. If the average at any
sampling point is greater than the MCL, then the system is out of
compliance. If any one sample would cause the annual average to be
exceeded, then the system is out of compliance immediately. Any sample
below the method detection limit shall be calculated at zero for the
purpose of determining the annual average. If a system fails to collect
the required number of samples, compliance (average concentration) will
be based on the total number of samples collected.
(2) For systems which are monitoring annually, or less frequently,
the system is out of compliance with the maximum contaminant levels for
antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium,
cyanide, fluoride, mercury, nickel, selenium or thallium if the level of
a contaminant is greater than the MCL. If confirmation samples are
required by the State, the determination of compliance will be based on
the annual average of the initial MCL exceedance and any State-required
confirmation samples. If a system fails to collect the required number
of samples, compliance (average concentration) will be based on the
total number of samples collected.
(3) Compliance with the maximum contaminant levels for nitrate and
nitrate is determined based on one sample if the levels of these
contaminants are below the MCLs. If the levels of nitrate and/or nitrite
exceed the MCLs in the initial sample, a confirmation sample is required
in accordance with paragraph (f)(2) of this section, and compliance
shall be determined based on the average of the initial and confirmation
samples.
(4) Arsenic sampling results will be reported to the nearest 0.001
mg/L.
(j) Each public water system shall monitor at the time designated by
the State during each compliance period.
(k) Inorganic analysis:
[[Page 393]]
(1) Analysis for the following contaminants shall be conducted in
accordance with the methods in the following table, or the alternative
methods listed in appendix A to subpart C of this part, or their
equivalent as determined by EPA. Criteria for analyzing arsenic, barium,
beryllium, cadmium, calcium, chromium, copper, lead, nickel, selenium,
sodium, and thallium with digestion or directly without digestion, and
other analytical test procedures are contained in Technical Notes on
Drinking Water Methods, EPA-600/R-94-173, October 1994. This document is
available from the National Service Center for Environmental
Publications (NSCEP), P.O. Box 42419, Cincinnati, OH 45242-0419 or
http://www.epa.gov/nscep/.
[[Page 394]]
--------------------------------------------------------------------------------------------------------------------------------------------------------
SM \4\ (18th, SM \4\ (20th
Contaminant Methodology \13\ EPA ASTM \3\ 19th ed.) ed.) SM Online \22\ Other
--------------------------------------------------------------------------------------------------------------------------------------------------------
1. Alkalinity................ Titrimetric..... ................ D1067-92, 02 B.. 2320 B.......... 2320 B......... 2320 B-97...... ...............
Electrometric ................ ................ ................ ............... I-1030-85 \5\..
titration.
2. Antimony.................. Inductively 200.8 \2\
Coupled Plasma
(ICP)--Mass
Spectrometry.
Hydride-Atomic ................ D3697-92, 02....
Absorption.
Atomic 200.9 \2\
Absorption;
Platform.
Atomic ................ ................ 3113 B.......... ............... 3113 B-99...... ...............
Absorption;
Furnace.
3. Arsenic \14\.............. ICP-Mass 200.8 \2\.......
Spectrometry.
Atomic 200.9 \2\.......
Absorption;
Platform.
Atomic ................ D2972-97, 03 C.. 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
Hydride Atomic ................ D1972-97, 03 B.. 3114 B.......... ............... 3114 B-97......
Absorption.
4. Asbestos.................. Transmission 100.1 \9\
Electron
Microscopy.
Transmission 100.2 \10\
Electron
Microscopy.
5. Barium.................... Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic ................ ................ 3111D........... ............... 3111 D-99......
Absorption;
Direct.
Atomic ................ ................ 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
6. Beryllium................. Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
Atomic ................ D3645-97, 03 B.. 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
7. Cadmium................... Inductively 200.7 \2\
Coupled Plasma.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
[[Page 395]]
Atomic ................ ................ 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
8. Calcium................... EDTA titrimetric ................ D511-93, 03 A... 3500-Ca D....... 3500-Ca B...... 3500-Ca B-97...
Atomic ................ D511-93, 03 B... 3111 B.......... ............... 3111 B-99......
Absorption;
Direct
Aspiration.
Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
Ion ................ D6919-03........
Chromatography.
9. Chromium.................. Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
Atomic ................ ................ 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
10. Copper................... Atomic ................ D1688-95, 02 C.. 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
Atomic ................ D1688-95, 02 A.. 3111 B.......... ............... 3111 B-99......
Absorption;
Direct
Aspiration.
Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
ICP-Mass 200.8 \2\
spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
11. Conductivity............. Conductance..... ................ D1125-95 2510 B.......... 2510 B......... 2510 B-97......
(Reapproved
1999) A.
12. Cyanide.................. Manual ................ D2036-98 A...... 4500-CN- C...... 4500-CN- C.....
Distillation
followed by
Spectrophotom ................ D2036-98 B...... 4500-CN- G...... 4500-CN- G..... 4500-CN- G-99..
etric,
Amenable.
Spectro- ................ D2036-98 A...... 4500-CN- E...... 4500-CN- E..... 4500-CN- E-99.. I-3300-85 \5\
photometric
Manual.
Spectro- 335.4 \6\
photometric
Semi-
automated.
Selective ................ ................ 4500-CN- F...... 4500-CN- F..... 4500-CN- F-99..
Electrode.
UV, ................ ................ ................ ............... ............... Kelada-01 \17\
Distillation,
Spectrophotomet
ric.
Micro ................ ................ ................ ............... ............... QuikChem 10-204-
Distillation, 00-1-X \18\
Flow Injection,
Spectrophotomet
ric.
Ligand Exchange ................ D6888-04........ ................ ............... ............... OIA-1677, DW
and Amperometry \20\
\21\.
[[Page 396]]
13. Fluoride................. Ion 300.0 \6\, 300.1 D4327-97, 03.... 4110 B.......... 4110 B......... 4110 B-00......
Chromatography. \19\
Manual Distill.; ................ ................ 4500-F- B, D.... 4500-F- B, D... 4500-F- B, D-97
Color. SPADNS.
Manual Electrode ................ D1179-93, 99 B.. 4500-F- C....... 4500-F- C...... 4500-F- C-97...
Automated ................ ................ ................ ............... ............... 380-75WE \11\
Electrode.
Automated ................ ................ 4500-F- E....... 4500-F- E...... 4500-F- E-97... 129-71W \11\
Alizarin.
Capillary Ion ................ ................ ................ ............... ............... D6508, Rev. 2
Electrophoresis. \23\
14. Lead..................... Atomic ................ D3559-96, 03 D.. 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
ICP-Mass 200.8 \2\
spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
Differential ................ ................ ................ ............... ............... Method 1001
Pulse Anodic \16\
Stripping
Voltametry.
15. Magnesium................ Atomic ................ D511-93, 03 B... 3111 B.......... ............... 3111 B-99......
Absorption.
ICP............. 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Complexation ................ D511-93, 03 A... 3500-Mg E....... 3500-Mg B...... 3500-Mg B-97...
Titrimetric
Methods.
Ion ................ D6919-03........
Chromatography.
16. Mercury.................. Manual, Cold 245.1 \2\....... D3223-97, 02.... 3112 B.......... ............... 3112 B-99......
Vapor.
Automated, Cold 245.2 \1\
Vapor.
ICP-Mass 200.8 \2\
Spectrometry.
17. Nickel................... Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
Atomic ................ ................ 3111 B.......... ............... 3111 B-99......
Absorption;
Direct.
Atomic ................ ................ 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
18. Nitrate.................. Ion 300.0 \6\ 300.1 D4327-97, 03.... 4110 B.......... 4110 B......... 4110 B-00...... B-1011 \8\
Chromatography. \19\
Automated 353.2 \6\....... D3867-90 A...... 4500-NO3- F..... 4500-NO3- F.... 4500-NO3- F-00.
Cadmium
Reduction.
Ion Selective ................ ................ 4500-NO3- D..... 4500-NO3- D.... 4500-NO3- D-00. 601 \7\
Electrode.
[[Page 397]]
Manual Cadmium ................ D3867-90 B...... 4500-NO3- E..... 4500-NO3- E.... 4500-NO3- E-00.
Reduction.
Capillary Ion ................ ................ ................ ............... ............... D6508, Rev. 2
Electrophoresis. \23\
19. Nitrite.................. Ion 300.0 \6\ 300.1 D4327-97, 03.... 4110 B.......... 4110 B......... 4110 B-00...... B-1011 \8\
Chromatography. \19\
Automated 353.2 \6\....... D3867-90 A...... 4500-NO3- F..... 4500-NO3- F.... 4500-NO3- F-00.
Cadmium
Reduction.
Manual Cadmium ................ D3867-90 B...... 4500-NO3- E..... 4500-NO3- E.... 4500-NO3- E-00.
Reduction.
Spectrophotometr ................ ................ 4500-NO2- B..... 4500-NO2- B.... 4500-NO2- B-00.
ic.
Capillary Ion ................ ................ ................ ............... ............... D6508, Rev. 2
Electrophoresis. \23\
20. Ortho-phosphate \12\..... Colorimetric, 365.1 \6\....... ................ 4500-P F........ 4500-P F.......
Automated,
Ascorbic Acid.
Colorimetric, ................ D515-88 A....... 4500-P E........ 4500-P E.......
ascorbic acid,
single reagent.
Colorimetric ................ ................ ................ ............... ............... I-1601-85 \5\
Phosphomolybdat
e;
Automated- ................ ................ ................ ............... ............... I-2601-90 \5\
segmented
flow;.
Automated ................ ................ ................ ............... ............... I-2598-85 \5\
Discrete.
Ion 300.0 \6\....... D4327-97, 03.... 4110 B.......... 4110 B......... 4110 B-00......
Chromatography. 300.1 \19\......
Capillary Ion ................ ................ ................ ............... ............... D6508, Rev. 2
Electrophoresis. \23\
21. pH....................... Electrometric... 150.1, 150.2 \1\ D1293-95, 99.... 4500-H+ B....... 4500-H+ B...... 4500-H+ B-00...
22. Selenium................. Hydride-Atomic ................ D3859-98, 03 A.. 3114 B.......... ............... 3114 B-97......
Absorption.
ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\
Absorption;
Platform.
Atomic ................ D3859-98, 03 B.. 3113 B.......... ............... 3113 B-99......
Absorption;
Furnace.
23. Silica................... Colorimetric, ................ ................ ................ ............... ............... I-1700-85 \5\
Molybdate Blue.
Automated- ................ ................ ................ ............... ............... I-2700-85 \5\
segmented
Flow.
Colorimetric.... ................ D859-94, 00.....
Molybdosilicate. ................ ................ 4500-Si D....... 4500-SiO2 C.... 4500-SiO2 C-97.
[[Page 398]]
Heteropoly blue. ................ ................ 4500-Si E....... 4500-SiO2 D.... 4500-SiO2 D-97.
Automated for ................ ................ 4500-Si F....... 4500-SiO2 E.... 4500-SiO2 E-97.
Molybdate-
reactive Silica.
Inductively 200.7 \2\....... ................ 3120 B.......... 3120 B......... 3120 B-99......
Coupled Plasma.
24. Sodium................... Inductively 200.7 \2\
Coupled Plasma.
Atomic ................ ................ 3111 B.......... ............... 3111 B-99......
Absorption;
Direct
Aspiration.
Ion ................ D6919-03........
Chromatography.
25. Temperature.............. Thermometric.... ................ ................ 2550............ 2550........... 2550-00........
26. Thallium................. ICP-Mass 200.8 \2\
Spectrometry.
Atomic 200.9 \2\ ......
Absorption;
Platform.
--------------------------------------------------------------------------------------------------------------------------------------------------------
The procedures shall be done in accordance with the documents listed below. The incorporation by reference of the following documents listed in
footnotes 1-11, 16-20, and 22-23 was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of
the documents may be obtained from the sources listed below. Information regarding obtaining these documents can be obtained from the Safe Drinking
Water Hotline at 800-426-4791. Documents may be inspected at EPA's Drinking Water Docket, EPA West, 1301 Constitution Avenue, NW., Room 3334,
Washington, DC 20460 (Telephone: 202-566-2426); or at the National Archives and Records Administration (NARA). For information on the availability of
this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal--register/code--of--federal--regulations/ibr--locations.html.
\1\ ``Methods for Chemical Analysis of Water and Wastes,'' EPA/600/4-79/020, March 1983. Available at NTIS, PB84-128677.
\2\ ``Methods for the Determination of Metals in Environmental Samples--Supplement I,'' EPA/600/R-94/111, May 1994. Available at NTIS, PB95-125472.
\3\ Annual Book of ASTM Standards, 1994, 1996, 1999, or 2003, Vols. 11.01 and 11.02, ASTM International; any year containing the cited version of the
method may be used. The previous versions of D1688-95A, D1688-95C (copper), D3559-95D (lead), D1293-95 (pH), D1125-91A (conductivity) and D859-94
(silica) are also approved. These previous versions D1688-90A, C; D3559-90D, D1293-84, D1125-91A and D859-88, respectively are located in the Annual
Book of ASTM Standards, 1994, Vol. 11.01. Copies may be obtained from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428.
\4\ Standard Methods for the Examination of Water and Wastewater, 18th edition (1992), 19th edition (1995), or 20th edition (1998). American Public
Health Association, 1015 Fifteenth Street, NW., Washington, DC 20005. The cited methods published in any of these three editions may be used, except
that the versions of 3111 B, 3111 D, 3113 B and 3114 B in the 20th edition may not be used.
\5\ Method I-2601-90, Methods for Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Inorganic and Organic
Constituents in Water and Fluvial Sediment, Open File Report 93-125, 1993; For Methods I-1030-85; I-1601-85; I-1700-85; I-2598-85; I-2700-85; and I-
3300-85 See Techniques of Water Resources Investigation of the U.S. Geological Survey, Book 5, Chapter A-1, 3rd edition., 1989; Available from
Information Services, U.S. Geological Survey, Federal Center, Box 25286, Denver, CO 80225-0425.
\6\ ``Methods for the Determination of Inorganic Substances in Environmental Samples,'' EPA/600/R-93/100, August 1993. Available at NTIS, PB94-120821.
\7\ The procedure shall be done in accordance with the Technical Bulletin 601 '' Standard Method of Test for Nitrate in Drinking Water,'' July 1994, PN
221890-001, Analytical Technology, Inc. Copies may be obtained from ATI Orion, 529 Main Street, Boston, MA 02129.
\8\ Method B-1011, ``Waters Test Method for Determination of Nitrite/Nitrate in Water Using Single Column Ion Chromatography,'' August 1987. Copies may
be obtained from Waters Corporation, Technical Services Division, 34 Maple Street, Milford, MA 01757, Telephone: 508/482-2131, Fax: 508/482-3625.
\9\ Method 100.1, ``Analytical Method For Determination of Asbestos Fibers in Water,'' EPA/600/4-83/043, EPA, September 1983. Available at NTIS, PB83-
260471.
\10\ Method 100.2, ``Determination of Asbestos Structure Over 10-[mu]m In Length In Drinking Water,'' EPA/600/R-94/134, June 1994. Available at NTIS,
PB94-201902.
\11\ Industrial Method No. 129-71W, ``Fluoride in Water and Wastewater,'' December 1972, and Method No. 380-75WE, ``Fluoride in Water and Wastewater,''
February 1976, Technicon Industrial Systems. Copies may be obtained from Bran & Luebbe, 1025 Busch Parkway, Buffalo Grove, IL 60089.
\12\ Unfiltered, no digestion or hydrolysis.
\13\ Because MDLs reported in EPA Methods 200.7 and 200.9 were determined using a 2x preconcentration step during sample digestion, MDLs determined when
samples are analyzed by direct analysis (i.e., no sample digestion) will be higher. For direct analysis of cadmium by Method 200.7, sample
preconcentration using pneumatic nebulization may be required to achieve lower detection limits. Preconcentration may also be required for direct
analysis of antimony, lead, and thallium by Method 200.9; antimony and lead by Method 3113 B; and lead by Method D3559-90D, unless multiple in-furnace
depositions are made.
\14\ If ultrasonic nebulization is used in the determination of arsenic by Method 200.8, the arsenic must be in the pentavalent state to provide uniform
signal response. For direct analysis of arsenic with Method 200.8 using ultrasonic nebulization, samples and standards must contain 1 mg/L of sodium
hypochlorite.
\15\ [Reserved]
[[Page 399]]
\16\ The description for Method Number 1001 for lead is available from Palintest, LTD, 21 Kenton Lands Road, P.O. Box 18395, Erlanger, KY 41018. Or from
the Hach Company, P.O. Box 389, Loveland, CO 80539.
\17\ The description for the Kelada-01 Method, ``Kelada Automated Test Methods for Total Cyanide, Acid Dissociable Cyanide, And Thiocyanate,'' Revision
1.2, August 2001, EPA 821-B-01-009 for cyanide is available from the National Technical Information Service (NTIS), PB 2001-108275, 5285
Port Royal Road, Springfield, VA 22161. The toll free telephone number is 800-553-6847. Note: A 450-W UV lamp may be used in this method instead of
the 550-W lamp specified if it provides performance within the quality control (QC) acceptance criteria of the method in a given instrument.
Similarly, modified flow cell configurations and flow conditions may be used in the method, provided that the QC acceptance criteria are met.
\18\ The description for the QuikChem Method 10-204-00-1-X, ``Digestion and distillation of total cyanide in drinking and wastewaters using MICRO DIST
and determination of cyanide by flow injection analysis,'' Revision 2.1, November 30, 2000, for cyanide is available from Lachat Instruments, 6645 W.
Mill Rd., Milwaukee, WI 53218. Telephone: 414-358-4200.
\19\ ``Methods for the Determination of Organic and Inorganic Compounds in Drinking Water,'' Vol. 1, EPA 815-R-00-014, August 2000. Available at NTIS,
PB2000-106981.
\20\ Method OIA-1677, DW ``Available Cyanide by Flow Injection, Ligand Exchange, and Amperometry,'' January 2004. EPA-821-R-04-001, Available from
ALPKEM, A Division of OI Analytical, P.O. Box 9010, College Station, TX 77842-9010.
\21\ Sulfide levels below those detected using lead acetate paper may produce positive method interferences. Test samples using a more sensitive sulfide
method to determine if a sulfide interference is present, and treat samples accordingly.
\22\ Standard Methods Online are available at http://www.standardmethods.org. The year in which each method was approved by the Standard Methods
Committee is designated by the last two digits in the method number. The methods listed are the only online versions that may be used.
\23\ Method D6508, Rev. 2, ``Test Method for Determination of Dissolved Inorganic Anions in Aqueous Matrices Using Capillary Ion Electrophoresis and
Chromate Electrolyte,'' available from Waters Corp, 34 Maple St, Milford, MA, 01757, Telephone: 508/482-2131, Fax: 508/482-3625.
[[Page 400]]
(2) Sample collection for antimony, arsenic, asbestos, barium,
beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel,
nitrate, nitrite, selenium, and thallium under this section shall be
conducted using the sample preservation, container, and maximum holding
time procedures specified in the table below:
------------------------------------------------------------------------
Container
Contaminant Preservative \1\ \2\ Time \3\
------------------------------------------------------------------------
Antimony..................... HNO\3\.......... P or G.... 6 months
Arsenic...................... Conc HNO3 to pH P or G.... 6 months
<2.
Asbestos..................... 4 [deg]C........ P or G.... 48 hours
\4\
Barium....................... HNO\3\.......... P or G.... 6 months
Beryllium.................... HNO\3\.......... P or G.... 6 months
Cadmium...................... HNO\3\.......... P or G.... 6 months
Chromium..................... HNO\3\.......... P or G.... 6 months
Cyanide...................... 4 [deg]C, NaOH.. P or G.... 14 days
Fluoride..................... None............ P or G.... 1 month
Mercury...................... HNO\3\.......... P or G.... 28 days
Nickel....................... HNO\3\.......... P or G.... 6 months
Nitrate...................... 4 [deg]C........ P or G.... 48 hours
\5\
Nitrate-Nitrite \6\.......... H\2\SO\4\....... P or G.... 28 days
Nitrite...................... 4[deg]C......... P or G.... 48 hours
Selenium..................... HNO\3\.......... P or G.... 6 months
Thallium..................... HNO\3\.......... P or G.... 6 months
------------------------------------------------------------------------
\1\ For cyanide determinations samples must be adjusted with sodium
hydroxide to pH 12 at the time off collection. When chilling is
indicated the sample must be shipped and stored at 4 [deg]C or less.
Acidification of nitrate or metals samples may be with a concentrated
acid or a dilute (50% by volume) solution of the applicable
concentrated acid. Acidification of samples for metals analysis is
encouraged and allowed at the laboratory rather than at the time of
sampling provided the shipping time and other instructions in Section
8.3 of EPA Methods 200.7 or 200.8 or 200.9 are followed.
\2\ P=plastic, hard or soft; G=glass, hard or soft.
\3\ In all cases samples should be analyzed as soon after collection as
possible. Follow additional (if any) information on preservation,
containers or holding times that is specified in method.
\4\ Instructions for containers, preservation procedures and holding
times as specified in Method 100.2 must be adhered to for all
compliance analyses including those conducted with Method 100.1.
\5\ If the sample is chlorinated, the holding time for an unacidified
sample kept at 4 [deg]C is extended to 14 days.
\6\ Nitrate-Nitrite refers to a measurement of total nitrate.
(3) Analysis under this section shall only be conducted by
laboratories that have been certified by EPA or the State. Laboratories
may conduct sample analysis under provisional certification until
January 1, 1996. To receive certification to conduct analyses for
antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium,
cyanide, fluoride, mercury, nickel, nitrate, nitrite and selenium and
thallium, the laboratory must:
(i) Analyze Performance Evaluation (PE) samples provided by EPA, the
State or by a third party (with the approval of the State or EPA) at
least once a year.
(ii) For each contaminant that has been included in the PE sample
and for each method for which the laboratory desires certification
achieve quantitative results on the analyses that are within the
following acceptance limits:
------------------------------------------------------------------------
Contaminant Acceptance limit
------------------------------------------------------------------------
Antimony............................ 30 at =0.006 mg/1
Arsenic............................. 30 at =0.003 mg/L
Asbestos............................ 2 standard deviations based on
study statistics.
Barium.............................. 15% at =0.15 mg/1
Beryllium........................... 15% at =0.001 mg/1
Cadmium............................. 20% at =0.002 mg/1
Chromium............................ 15% at =0.01 mg/1
Cyanide............................. 25% at =0.1 mg/1
Fluoride............................ 10% at =1 to 10 mg/1
Mercury............................. 30% at =0.0005 mg/1
Nickel.............................. 15% at =0.01 mg/1
Nitrate............................. 10% at =0.4 mg/1
Nitrite............................. 15% at =0.4 mg/1
Selenium............................ 20% at =0.01 mg/1
Thallium............................ 30% at =0.002 mg/1
------------------------------------------------------------------------
(l) Analyses for the purpose of determining compliance with Sec.
141.11 shall be conducted using the requirements specified in paragraphs
(l) through (q) of this section.
(1) Analyses for all community water systems utilizing surface water
sources shall be completed by June 24, 1978. These analyses shall be
repeated at yearly intervals.
(2) Analyses for all community water systems utilizing only ground
water sources shall be completed by June 24, 1979. These analyses shall
be repeated at three-year intervals.
(3) For non-community water systems, whether supplied by surface or
ground sources, analyses for nitrate shall be completed by December 24,
1980. These analyses shall be repeated at intervals determined by the
State.
(4) The State has the authority to determine compliance or initiate
enforcement action based upon analytical results and other information
compiled by their sanctioned representatives and agencies.
(m) If the result of an analysis made under paragraph (l) of this
section indicates that the level of any contaminant listed in Sec.
141.11 exceeds the maximum contaminant level, the supplier of the water
shall report to the State within 7 days and initiate three additional
analyses at the same sampling point within one month.
[[Page 401]]
(n) When the average of four analyses made pursuant to paragraph (m)
of this section, rounded to the same number of significant figures as
the maximum contaminant level for the substance in question, exceeds the
maximum contaminant level, the supplier of water shall notify the State
pursuant to Sec. 141.31 and give notice to the public pursuant to
subpart Q. Monitoring after public notification shall be at a frequency
designated by the State and shall continue until the maximum contaminant
level has not been exceeded in two successive samples or until a
monitoring schedule as a condition to a variance, exemption or
enforcement action shall become effective.
(o) The provisions of paragraphs (m) and (n) of this section
notwithstanding, compliance with the maximum contaminant level for
nitrate shall be determined on the basis of the mean of two analyses.
When a level exceeding the maximum contaminant level for nitrate is
found, a second analysis shall be initiated within 24 hours, and if the
mean of the two analyses exceeds the maximum contaminant level, the
supplier of water shall report his findings to the State pursuant to
Sec. 141.31 and shall notify the public pursuant to subpart Q.
(p) For the initial analyses required by paragraph (l) (1), (2) or
(3) of this section, data for surface waters acquired within one year
prior to the effective date and data for ground waters acquired within 3
years prior to the effective date of this part may be substituted at the
discretion of the State.
(q) [Reserved]
[56 FR 3579, Jan. 30, 1991]
Editorial Note: For Federal Register citations affecting Sec.
141.23, see the List of CFR Sections Affected, which appears in the
Finding Aids section of the printed volume and on GPO Access.
Sec. 141.24 Organic chemicals, sampling and analytical requirements.
(a)-(d) [Reserved]
(e) Analyses for the contaminants in this section shall be conducted
using the methods listed in the following table, or the alternative
methods listed in appendix A to subpart C of this part, or their
equivalent as determined by EPA.
(1) The following documents are incorporated by reference. This
incorporation by reference was approved by the Director of the Federal
Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies
may be inspected at EPA's Drinking Water Docket, 1301 Constitution
Avenue, NW., EPA West, Room 3334, Washington, DC 20460 (Telephone: 202-
566-2426); or at the National Archives and Records Administration
(NARA). For information on the availability of this material at NARA,
call 202-741-6030, or go to: http://www.archives.gov/federal--register/
code--of--federal--regulations/ibr--locations.html. Method 508A and
515.1 are in Methods for the Determination of Organic Compounds in
Drinking Water, EPA/600/4-88-039, December 1988, Revised, July 1991.
Methods 547, 550 and 550.1 are in Methods for the Determination of
Organic Compounds in Drinking Water--Supplement I, EPA/600-4-90-020,
July 1990. Methods 548.1, 549.1, 552.1 and 555 are in Methods for the
Determination of Organic Compounds in Drinking Water--Supplement II,
EPA/600/R-92-129, August 1992. Methods 502.2, 504.1, 505, 506, 507, 508,
508.1, 515.2, 524.2 525.2, 531.1, 551.1 and 552.2 are in Methods for the
Determination of Organic Compounds in Drinking Water--Supplement III,
EPA/600/R-95-131, August 1995. Method 1613 is titled ``Tetra-through
Octa-Chlorinated Dioxins and Furans by Isotope-Dilution HRGC/HRMS,''
EPA/821-B-94-005, October 1994. These documents are available from the
National Technical Information Service, NTIS PB91-231480, PB91-146027,
PB92-207703, PB95-261616 and PB95-104774, U.S. Department of Commerce,
5285 Port Royal Road, Springfield, Virginia 22161. The toll free number
is: 800-553-6847. Method 6651 shall be followed in accordance with
Standard Methods for the Examination of Water and Wastewater, 18th
edition (1992), 19th edition (1995), or 20th edition (1998), American
Public Health Association (APHA); any of these three editions may be
used. Method 6610 shall be followed in accordance with Standard Methods
for the Examination of Water and Wastewater, (18th Edition Supplement)
(1994), or with the 19th edition (1995) or 20th edition (1998) of
Standard Methods for the Examination of Water and Wastewater;
[[Page 402]]
any of these publications may be used. The APHA documents are available
from APHA, 1015 Fifteenth Street NW., Washington, DC 20005. Other
required analytical test procedures germane to the conduct of these
analyses are contained in Technical Notes on Drinking Water Methods,
EPA/600/R-94-173, October 1994, NTIS PB95-104766. EPA Methods 515.3 and
549.2 are available from U.S. Environmental Protection Agency, National
Exposure Research Laboratory (NERL)-Cincinnati, 26 West Martin Luther
King Drive, Cincinnati, OH 45268. ASTM Method D 5317-93, 98 (Reapproved
2003) is available in the Annual Book of ASTM Standards, (1999), Vol.
11.02, ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA
19428, any edition containing the cited version of the method may be
used. EPA Method 515.4, ``Determination of Chlorinated Acids in Drinking
Water by Liquid-Liquid Microextraction, Derivatization and Fast Gas
Chromatography with Electron Capture Detection,'' Revision 1.0, April
2000, EPA/815/B-00/001 and EPA Method 552.3, ``Determination of
Haloacetic Acids and Dalapon in Drinking Water by Liquid-Liquid
Microextraction, Derivatization, and Gas Chromatography with Electron
Capture Detection,'' Revision 1.0, July 2003, EPA 815-B-03-002, can be
accessed and downloaded directly online at http://www.epa.gov/safewater/
methods/sourcalt.html. Syngenta Method AG-625, ``Atrazine in Drinking
Water by Immunoassay,'' February 2001, is available from Syngenta Crop
Protection, Inc., 410 Swing Road, P.O. Box 18300, Greensboro, NC 27419.
Telephone: 336-632-6000. Method 531.2 ``Measurement of N-
methylcarbamoyloximes and N-methylcarbamates in Water by Direct Aqueous
Injection HPLC with Postcolumn Derivatization,'' Revision 1.0, September
2001, EPA 815-B-01-002, can be accessed and downloaded directly online
at http://www.epa.gov/safewater/methods/sourcalt.html.
----------------------------------------------------------------------------------------------------------------
Contaminant EPA method Standard methods ASTM Other
----------------------------------------------------------------------------------------------------------------
1. Benzene........................ 502.2, 524.2........
2. Carbon tetrachloride........... 502.2, 524.2, 551.1.
3. Chlorobenzene.................. 502.2, 524.2........
4. 1,2-Dichlorobenzene............ 502.2, 524.2........
5. 1,4-Dichlorobenzene............ 502.2, 524.2........
6. 1,2-Dichloroethane............. 502.2, 524.2........
7. cis-Dichloroethylene........... 502.2, 524.2........
8. trans-Dichloroethylene......... 502.2, 524.2........
9. Dichloromethane................ 502.2, 524.2........
10. 1,2-Dichloropropane........... 502.2, 524.2........
11. Ethylbenzene.................. 502.2, 524.2........
12. Styrene....................... 502.2, 524.2........
13. Tetrachloroethylene........... 502.2, 524.2, 551.1.
14. 1,1,1-Trichloroethane......... 502.2, 524.2, 551.1.
15. Trichloroethylene............. 502.2, 524.2, 551.1.
16. Toluene....................... 502.2, 524.2........
17. 1,2,4-Trichlorobenzene........ 502.2, 524.2........
18. 1,1-Dichloroethylene.......... 502.2, 524.2........
19. 1,1,2-Trichloroethane......... 502.2, 524.2, 551.1.
20. Vinyl chloride................ 502.2, 524.2........
21. Xylenes (total)............... 502.2, 524.2........
22. 2,3,7,8-TCDD (dioxin)......... 1613................
23. 2,4-D \4\ (as acids, salts, 515.2, 555, 515.1, .................... D5317-93, 98
and esters). 515.3, 515.4. (Reapproved
2003).
24. 2,4,5-TP \4\ (Silvex)......... 515.2, 555, 515.1, .................... D5317-93, 98
515.3, 515.4. (Reapproved
2003).
25. Alachlor \2\.................. 507, 525.2, 508.1,
505, 551.1.
26. Atrazine \2\.................. 507, 525.2, 508.1, .................... ............... Syngenta \5\ AG-
505, 551.1. 625
27. Benzo(a)pyrene................ 525.2, 550, 550.1...
28. Carbofuran.................... 531.1, 531.2........ 6610................
29. Chlordane..................... 508, 525.2, 508.1,
505.
30. Dalapon....................... 552.1 515.1, 552.2,
515.3, 515.4, 552.3.
[[Page 403]]
31. Di(2-ethylhexyl)adipate....... 506, 525.2..........
32. Di(2-ethylhexyl)phthalate..... 506, 525.2..........
33. Dibromochloropropane (DBCP)... 504.1, 551.1........
34. Dinoseb \4\................... 515.2, 555, 515.1,
515.3, 515.4.
35. Diquat........................ 549.2...............
36. Endothall..................... 548.1...............
37. Endrin........................ 508, 525.2, 508.1,
505, 551.1.
38. Ethylene dibromide (EDB)...... 504.1, 551.1........
39. Glyphosate.................... 547................. 6651................
40. Heptachlor.................... 508, 525.2, 508.1,
505, 551.1.
41. Heptachlor Epoxide............ 508, 525.2, 508.1,
505, 551.1.
42. Hexachlorobenzene............. 508, 525.2, 508.1,
505, 551.1.
43. Hexachlorocyclopentadiene..... 508, 525.2, 508.1,
505, 551.1.
44. Lindane....................... 508, 525.2, 508.1,
505, 551.1.
45. Methoxychlor.................. 508, 525.2, 508.1,
505, 551.1.
46. Oxamyl........................ 531.1, 531.2........ 6610................
47. PCBs \3\ (as 508A................
decachlorobiphenyl).
48. PCBs \3\ (as Aroclors)........ 508.1, 508, 525.2,
505.
49. Pentachlorophenol............. 515.2, 525.2, 555, .................... D5317-93, 98
515.1, 515.3, 515.4. (Reapproved
2003).
50. Picloram \4\.................. 515.2, 555, 515.1, .................... D5317-93, 98
515.3, 515.4. (Reapproved
2003).
51. Simazine \2\.................. 507, 525.2, 508.1,
505, 551.1.
52. Toxaphene..................... 508, 508.1, 525.2,
505.
53. Total Trihalomethanes......... 502.2, 524.2, 551.1.
----------------------------------------------------------------------------------------------------------------
\1\ [Reserved]
\2\ Substitution of the detector specified in Method 505, 507, 508 or 508.1 for the purpose of achieving lower
detection limits is allowed as follows. Either an electron capture or nitrogen phosphorous detector may be
used provided all regulatory requirements and quality control criteria are met.
\3\ PCBs are qualitatively identified as Aroclors and measured for compliance purposes as decachlorobiphenyl.
Users of Method 505 may have more difficulty in achieving the required detection limits than users of Methods
508.1, 525.2 or 508.
\4\ Accurate determination of the chlorinated esters requires hydrolysis of the sample as described in EPA
Methods 515.1, 515.2, 515.3, 515.4 and 555 and ASTM Method D5317-93.
\5\ This method may not be used for the analysis of atrazine in any system where chlorine dioxide is used for
drinking water treatment. In samples from all other systems, any result for atrazine generated by Method AG-
625 that is greater than one-half the maximum contaminant level (MCL) (in other words, greater than 0.0015mg/L
or 1.5 [mu]g/L) must be confirmed using another approved method for this contaminant and should use additional
volume of the original sample collected for compliance monitoring. In instances where a result from Method AG-
625 triggers such confirmatory testing, the confirmatory result is to be used to determine compliance.
(2) [Reserved]
(f) Beginning with the initial compliance period, analysis of the
contaminants listed in Sec. 141.61(a) (1) through (21) for the purpose
of determining compliance with the maximum contaminant level shall be
conducted as follows:
(1) Groundwater systems shall take a minimum of one sample at every
entry point to the distribution system which is representative of each
well after treatment (hereafter called a sampling point). Each sample
must be taken at the same sampling point unless conditions make another
sampling point more representative of each source, treatment plant, or
within the distribution system.
(2) Surface water systems (or combined surface/ground) shall take a
minimum of one sample at points in the distribution system that are
representative of each source or at each entry point to the distribution
system after treatment (hereafter called a sampling point). Each sample
must be taken at the same sampling point unless conditions make another
sampling point more representative of each source, treatment plant, or
within the distribution system.
(3) If the system draws water from more than one source and the
sources are combined before distribution, the system must sample at an
entry point to the distribution system during periods of normal
operating conditions
[[Page 404]]
(i.e., when water representative of all sources is being used).
(4) Each community and non-transient non-community water system
shall take four consecutive quarterly samples for each contaminant
listed in Sec. 141.61(a) (2) through (21) during each compliance
period, beginning in the initial compliance period.
(5) If the initial monitoring for contaminants listed in Sec.
141.61(a) (1) through (8) and the monitoring for the contaminants listed
in Sec. 141.61(a) (9) through (21) as allowed in paragraph (f)(18) has
been completed by December 31, 1992, and the system did not detect any
contaminant listed in Sec. 141.61(a) (1) through (21), then each ground
and surface water system shall take one sample annually beginning with
the initial compliance period.
(6) After a minimum of three years of annual sampling, the State may
allow groundwater systems with no previous detection of any contaiminant
listed in Sec. 141.61(a) to take one sample during each compliance
period.
(7) Each community and non-transient non-community ground water
system which does not detect a contaminant listed in Sec. 141.61(a) (1)
through (21) may apply to the State for a waiver from the requirements
of paragraphs (f)(5) and (f)(6) of this section after completing the
initial monitoring. (For purposes of this section, detection is defined
as =0.0005 mg/l.) A waiver shall be effective for no more
than six years (two compliance periods). States may also issue waivers
to small systems for the initial round of monitoring for 1,2,4-
trichlorobenzene.
(8) A State may grant a waiver after evaluating the following
factor(s):
(i) Knowledge of previous use (including transport, storage, or
disposal) of the contaminant within the watershed or zone of influence
of the system. If a determination by the State reveals no previous use
of the contaminant within the watershed or zone of influence, a waiver
may be granted.
(ii) If previous use of the contaminant is unknown or it has been
used previously, then the following factors shall be used to determine
whether a waiver is granted.
(A) Previous analytical results.
(B) The proximity of the system to a potential point or non-point
source of contamination. Point sources include spills and leaks of
chemicals at or near a water treatment facility or at manufacturing,
distribution, or storage facilities, or from hazardous and municipal
waste landfills and other waste handling or treatment facilities.
(C) The environmental persistence and transport of the contaminants.
(D) The number of persons served by the public water system and the
proximity of a smaller system to a larger system.
(E) How well the water source is protected against contamination,
such as whether it is a surface or groundwater system. Groundwater
systems must consider factors such as depth of the well, the type of
soil, and wellhead protection. Surface water systems must consider
watershed protection.
(9) As a condition of the waiver a groundwater system must take one
sample at each sampling point during the time the waiver is effective
(i.e., one sample during two compliance periods or six years) and update
its vulnerability assessment considering the factors listed in paragraph
(f)(8) of this section. Based on this vulnerability assessment the State
must reconfirm that the system is non-vulnerable. If the State does not
make this reconfirmation within three years of the initial
determination, then the waiver is invalidated and the system is required
to sample annually as specified in paragraph (5) of this section.
(10) Each community and non-transient non-community surface water
system which does not detect a contaminant listed in Sec. 141.61(a) (1)
through (21) may apply to the State for a waiver from the requirements
of (f)(5) of this section after completing the initial monitoring.
Composite samples from a maximum of five sampling points are allowed,
provided that the detection limit of the method used for analysis is
less than one-fifth of the MCL. Systems meeting this criterion must be
determined by the State to be non-vulnerable based on a vulnerability
assessment during each compliance period. Each system receiving a waiver
shall sample at the frequency specified by the State (if any).
[[Page 405]]
(11) If a contaminant listed in Sec. 141.61(a) (2) through (21) is
detected at a level exceeding 0.0005 mg/l in any sample, then:
(i) The system must monitor quarterly at each sampling point which
resulted in a detection.
(ii) The State may decrease the quarterly monitoring requirement
speci fied in paragraph (f)(11)(i) of this section provided it has
determined that the system is reliably and consistently below the
maximum contaminant level. In no case shall the State make this
determination unless a groundwater system takes a minimum of two
quarterly samples and a surface water system takes a minimum of four
quarterly samples.
(iii) If the State determines that the system is reliably and
consistently below the MCL, the State may allow the system to monitor
annually. Systems which monitor annually must monitor during the
quarter(s) which previously yielded the highest analytical result.
(iv) Systems which have three consecutive annual samples with no
detection of a contaminant may apply to the State for a waiver as
specified in paragraph (f)(7) of this section.
(v) Groundwater systems which have detected one or more of the
following two-carbon organic compounds: trichloroethylene,
tetrachloroethylene, 1,2-dichloroethane, 1,1,1-trichloroethane, cis-1,2-
dichloroethylene, trans-1,2-dichloroethylene, or 1,1-dichloroethylene
shall monitor quarterly for vinyl chloride. A vinyl chloride sample
shall be taken at each sampling point at which one or more of the two-
carbon organic compounds was detected. If the results of the first
analysis do not detect vinyl chloride, the State may reduce the
quarterly monitoring frequency of vinyl chloride monitoring to one
sample during each compliance period. Surface water systems are required
to monitor for vinyl chloride as specified by the State.
(12) Systems which violate the requirements of Sec. 141.61(a) (1)
through (21), as determined by paragraph (f)(15) of this section, must
monitor quarterly. After a minimum of four consecutive quarterly samples
which show the system is in compliance as specified in paragraph (f)(15)
of this section the system and the State determines that the system is
reliably and consistently below the maximum contaminant level, the
system may monitor at the frequency and times specified in paragraph
(f)(11)(iii) of this section.
(13) The State may require a confirmation sample for positive or
negative results. If a confirmation sample is required by the State, the
result must be averaged with the first sampling result and the average
is used for the compliance determination as specified by paragraph
(f)(15). States have discretion to delete results of obvious sampling
errors from this calculation.
(14) The State may reduce the total number of samples a system must
analyze by allowing the use of compositing. Composite samples from a
maximum of five sampling points are allowed, provided that the detection
limit of the method used for analysis is less than one-fifth of the MCL.
Compositing of samples must be done in the laboratory and analyzed
within 14 days of sample collection.
(i) If the concentration in the composite sample is greater than or
equal to 0.0005 mg/l for any contaminant listed in Sec. 141.61(a), then
a follow-up sample must be taken within 14 days at each sampling point
included in the composite, and be analyzed for that contaminant.
(ii) If duplicates of the original sample taken from each sampling
point used in the composite sample are available, the system may use
these instead of resampling. The duplicates must be analyzed and the
results reported to the State within 14 days after completing analysis
of the composite sample, provided the holding time of the sample is not
exceeded.
(iii) If the population served by the system is 3,300
persons, then compositing may only be permitted by the State at sampling
points within a single system. In systems serving <= 3,300 persons, the
State may permit compositing among different systems provided the 5-
sample limit is maintained.
(iv) Compositing samples prior to GC analysis.
[[Page 406]]
(A) Add 5 ml or equal larger amounts of each sample (up to 5 samples
are allowed) to a 25 ml glass syringe. Special precautions must be made
to maintain zero headspace in the syringe.
(B) The samples must be cooled at 4 [deg]C during this step to
minimize volatilization losses.
(C) Mix well and draw out a 5-ml aliquot for analysis.
(D) Follow sample introduction, purging, and desorption steps
described in the method.
(E) If less than five samples are used for compositing, a
proportionately small syringe may be used.
(v) Compositing samples prior to GC/MS analysis.
(A) Inject 5-ml or equal larger amounts of each aqueous sample (up
to 5 samples are allowed) into a 25-ml purging device using the sample
introduction technique described in the method.
(B) The total volume of the sample in the purging device must be 25
ml.
(C) Purge and desorb as described in the method.
(15) Compliance with Sec. 141.61(a) (1) through (21) shall be
determined based on the analytical results obtained at each sampling
point. If one sampling point is in violation of an MCL, the system is in
violation of the MCL.
(i) For systems monitoring more than once per year, compliance with
the MCL is determined by a running annual average at each sampling
point.
(ii) Systems monitoring annually or less frequently whose sample
result exceeds the MCL must begin quarterly sampling. The system will
not be considered in violation of the MCL until it has completed one
year of quarterly sampling.
(iii) If any sample result will cause the running annual average to
exceed the MCL at any sampling point, the system is out of compliance
with the MCL immediately.
(iv) If a system fails to collect the required number of samples,
compliance will be based on the total number of samples collected.
(v) If a sample result is less than the detection limit, zero will
be used to calculate the annual average.
(16) [Reserved]
(17) Analysis under this section shall only be conducted by
laboratories that are certified by EPA or the State according to the
following conditions (laboratories may conduct sample analysis under
provisional certification until January 1, 1996):
(i) To receive certification to conduct analyses for the
contaminants in Sec. 141.61(a) (2) through (21) the laboratory must:
(A) Analyze Performance Evaluation (PE) samples provided by EPA, the
State, or by a third party (with the approval of the State or EPA) at
least once a year by each method for which the laboratory desires
certification.
(B) Achieve the quantitative acceptance limits under paragraphs
(f)(17)(i)(C) and (D) of this section for at least 80 percent of the
regulated organic contaminants included in the PE sample.
(C) Achieve quantitative results on the analyses performed under
paragraph (f)(17)(i)(A) of this section that are within 20% of the actual amount of the substances in the
Performance Evaluation sample when the actual amount is greater than or
equal to 0.010 mg/l.
(D) Achieve quantitative results on the analyses performed under
paragraph (f)(17)(i)(A) of this section that are within 40 percent of the actual amount of the substances in the
Performance Evaluation sample when the actual amount is less than 0.010
mg/l.
(E) Achieve a method detection limit of 0.0005 mg/l, according to
the procedures in appendix B of part 136.
(ii) To receive certification to conduct analyses for vinyl
chloride, the laboratory must:
(A) Analyze Performance Evaluation (PE) samples provided by EPA, the
State, or by a third party (with the approval of the State or EPA) at
least once a year by each method for which the laboratory desires
certification.
(B) Achieve quantitative results on the analyses performed under
paragraph (f)(17)(ii)(A) of this section that are within 40 percent of the actual amount of vinyl chloride in the
Performance Evaluation sample.
(C) Achieve a method detection limit of 0.0005 mg/l, according to
the procedures in appendix B of part 136.
[[Page 407]]
(D) Obtain certification for the contaminants listed in Sec.
141.61(a)(2) through (21).
(18) States may allow the use of monitoring data collected after
January 1, 1988, required under section 1445 of the Act for purposes of
initial monitoring compliance. If the data are generally consistent with
the other requirements of this section, the State may use these data
(i.e., a single sample rather than four quarterly samples) to satisfy
the initial monitoring requirement of paragraph (f)(4) of this section.
Systems which use grandfathered samples and did not detect any
contaminant listed Sec. 141.61(a)(2) through (21) shall begin
monitoring annually in accordance with paragraph (f)(5) of this section
beginning with the initial compliance period.
(19) States may increase required monitoring where necessary to
detect variations within the system.
(20) Each certified laboratory must determine the method detection
limit (MDL), as defined in appendix B to part 136, at which it is
capable of detecting VOCs. The acceptable MDL is 0.0005 mg/l. This
concentration is the detection concentration for purposes of this
section.
(21) Each public water system shall monitor at the time designated
by the State within each compliance period.
(22) All new systems or systems that use a new source of water that
begin operation after January 22, 2004 must demonstrate compliance with
the MCL within a period of time specified by the State. The system must
also comply with the initial sampling frequencies specified by the State
to ensure a system can demonstrate compliance with the MCL. Routine and
increased monitoring frequencies shall be conducted in accordance with
the requirements in this section.
(g) [Reserved]
(h) Analysis of the contaminants listed in Sec. 141.61(c) for the
purposes of determining compliance with the maximum contaminant level
shall be conducted as follows, with the exception that no monitoring is
required for aldicarb, aldicarb sulfoxide or aldicarb sulfone:
(1) Groundwater systems shall take a minimum of one sample at every
entry point to the distribution system which is representative of each
well after treatment (hereafter called a sampling point). Each sample
must be taken at the same sampling point unless conditions make another
sampling point more representative of each source or treatment plant.
(2) Surface water systems shall take a minimum of one sample at
points in the distribution system that are representative of each source
or at each entry point to the distribution system after treatment
(hereafter called a sampling point). Each sample must be taken at the
same sampling point unless conditions make another sampling point more
representative of each source or treatment plant.
Note: For purposes of this paragraph, surface water systems include
systems with a combination of surface and ground sources.
(3) If the system draws water from more than one source and the
sources are combined before distribution, the system must sample at an
entry point to the distribution system during periods of normal
operating conditions (i.e., when water representative of all sources is
being used).
(4) Monitoring frequency:
(i) Each community and non-transient non-community water system
shall take four consecutive quarterly samples for each contaminant
listed in Sec. 141.61(c) during each compliance period beginning with
the initial compliance period.
(ii) Systems serving more than 3,300 persons which do not detect a
contaminant in the initial compliance period may reduce the sampling
frequency to a minimum of two quarterly samples in one year during each
repeat compliance period.
(iii) Systems serving less than or equal to 3,300 persons which do
not detect a contaminant in the initial compliance period may reduce the
sampling frequency to a minimum of one sample during each repeat
compliance period.
(5) Each community and non-transient water system may apply to the
State for a waiver from the requirement of paragraph (h)(4) of this
section. A system must reapply for a waiver for each compliance period.
[[Page 408]]
(6) A State may grant a waiver after evaluating the following
factor(s): Knowledge of previous use (including transport, storage, or
disposal) of the contaminant within the watershed or zone of influence
of the system. If a determination by the State reveals no previous use
of the contaminant within the watershed or zone of influence, a waiver
may be granted. If previous use of the contaminant is unknown or it has
been used previously, then the following factors shall be used to
determine whether a waiver is granted.
(i) Previous analytical results.
(ii) The proximity of the system to a potential point or non-point
source of contamination. Point sources include spills and leaks of
chemicals at or near a water treatment facility or at manufacturing,
distribution, or storage facilities, or from hazardous and municipal
waste landfills and other waste handling or treatment facilities. Non-
point sources include the use of pesticides to control insect and weed
pests on agricultural areas, forest lands, home and gardens, and other
land application uses.
(iii) The environmental persistence and transport of the pesticide
or PCBs.
(iv) How well the water source is protected against contamination
due to such factors as depth of the well and the type of soil and the
integrity of the well casing.
(v) Elevated nitrate levels at the water supply source.
(vi) Use of PCBs in equipment used in the production, storage, or
distribution of water (i.e., PCBs used in pumps, transformers, etc.).
(7) If an organic contaminant listed in Sec. 141.61(c) is detected
(as defined by paragraph (h)(18) of this section) in any sample, then:
(i) Each system must monitor quarterly at each sampling point which
resulted in a detection.
(ii) The State may decrease the quarterly monitoring requirement
specified in paragraph (h)(7)(i) of this section provided it has
determined that the system is reliably and consistently below the
maximum contaminant level. In no case shall the State make this
determination unless a groundwater system takes a minimum of two
quarterly samples and a surface water system takes a minimum of four
quarterly samples.
(iii) After the State determines the system is reliably and
consistently below the maximum contaminant level the State may allow the
system to monitor annually. Systems which monitor annually must monitor
during the quarter that previously yielded the highest analytical
result.
(iv) Systems which have 3 consecutive annual samples with no
detection of a contaminant may apply to the State for a waiver as
specified in paragraph (h)(6) of this section.
(v) If the monitoring results in detection of one or more of certain
related contaminants (heptachlor and heptachlor epoxide), then
subsequent monitoring shall analyze for all related contaminants.
(8) Systems which violate the requirements of Sec. 141.61(c) as
determined by paragraph (h)(11) of this section must monitor quarterly.
After a minimum of four quarterly samples show the system is in
compliance and the State determines the system is reliably and
consistently below the MCL, as specified in paragraph (h)(11) of this
section, the system shall monitor at the frequency specified in
paragraph (h)(7)(iii) of this section.
(9) The State may require a confirmation sample for positive or
negative results. If a confirmation sample is required by the State, the
result must be averaged with the first sampling result and the average
used for the compliance determination as specified by paragraph (h)(11)
of this section. States have discretion to delete results of obvious
sampling errors from this calculation.
(10) The State may reduce the total number of samples a system must
analyze by allowing the use of compositing. Composite samples from a
maximum of five sampling points are allowed, provided that the detection
limit of the method used for analysis is less than one-fifth of the MCL.
Compositing of samples must be done in the laboratory and analyzed
within 14 days of sample collection.
(i) If the concentration in the composite sample detects one or more
contaminants listed in Sec. 141.61(c), then a follow-up sample must be
taken within
[[Page 409]]
14 days at each sampling point included in the composite, and be
analyzed for that contaminant.
(ii) If duplicates of the original sample taken from each sampling
point used in the composite sample are available, the system may use
these instead of resampling. The duplicates must be analyzed and the
results reported to the State within 14 days after completion of the
composite analysis or before the holding time for the initial sample is
exceeded whichever is sooner.
(iii) If the population served by the system is 3,300
persons, then compositing may only be permitted by the State at sampling
points within a single system. In systems serving <= 3,300 persons, the
State may permit compositing among different systems provided the 5-
sample limit is maintained.
(11) Compliance with Sec. 141.61(c) shall be determined based on
the analytical results obtained at each sampling point. If one sampling
point is in violation of an MCL, the system is in violation of the MCL.
(i) For systems monitoring more than once per year, compliance with
the MCL is determined by a running annual average at each sampling
point.
(ii) Systems monitoring annually or less frequently whose sample
result exceeds the regulatory detection level as defined by paragraph
(h)(18) of this section must begin quarterly sampling. The system will
not be considered in violation of the MCL until it has completed one
year of quarterly sampling.
(iii) If any sample result will cause the running annual average to
exceed the MCL at any sampling point, the system is out of compliance
with the MCL immediately.
(iv) If a system fails to collect the required number of samples,
compliance will be based on the total number of samples collected.
(v) If a sample result is less than the detection limit, zero will
be used to calculate the annual average.
(12) [Reserved]
(13) Analysis for PCBs shall be conducted as follows using the
methods in paragraph (e) of this section:
(i) Each system which monitors for PCBs shall analyze each sample
using either Method 508.1, 525.2, 508 or 505. Users of Method 505 may
have more difficulty in achieving the required Aroclor detection limits
than users of Methods 508.1, 525.2 or 508.
(ii) If PCBs (as one of seven Aroclors) are detected (as designated
in this paragraph) in any sample analyzed using Method 505 or 508, the
system shall reanalyze the sample using Method 508A to quantitate PCBs
(as decachlorobiphenyl).
------------------------------------------------------------------------
Detection limit
Aroclor (mg/l)
------------------------------------------------------------------------
1016................................................. 0.00008
1221................................................. 0.02
1232................................................. 0.0005
1242................................................. 0.0003
1248................................................. 0.0001
1254................................................. 0.0001
1260................................................. 0.0002
------------------------------------------------------------------------
(iii) Compliance with the PCB MCL shall be determined based upon the
quantitative results of analyses using Method 508A.
(14) If monitoring data collected after January 1, 1990, are
generally consistent with the requirements of Sec. 141.24(h), then the
State may allow systems to use that data to satisfy the monitoring
requirement for the initial compliance period beginning January 1, 1993.
(15) The State may increase the required monitoring frequency, where
necessary, to detect variations within the system (e.g., fluctuations in
concentration due to seasonal use, changes in water source).
(16) The State has the authority to determine compliance or initiate
enforcement action based upon analytical results and other information
compiled by their sanctioned representatives and agencies.
(17) Each public water system shall monitor at the time designated
by the State within each compliance period.
(18) Detection as used in this paragraph shall be defined as greater
than or equal to the following concentrations for each contaminant.
------------------------------------------------------------------------
Detection
Contaminant limit (mg/
l)
------------------------------------------------------------------------
Alachlor................................................... .0002
Aldicarb................................................... .0005
Aldicarb sulfoxide......................................... .0005
Aldicarb sulfone........................................... .0008
Atrazine................................................... .0001
Benzo[a]pyrene............................................. .00002
Carbofuran................................................. .0009
[[Page 410]]
Chlordane.................................................. .0002
Dalapon.................................................... .001
1,2-Dibromo-3-chloropropane (DBCP)......................... .00002
Di (2-ethylhexyl) adipate.................................. .0006
Di (2-ethylhexyl) phthalate................................ .0006
Dinoseb.................................................... .0002
Diquat..................................................... .0004
2,4-D...................................................... .0001
Endothall.................................................. .009
Endrin..................................................... .00001
Ethylene dibromide (EDB)................................... .00001
Glyphosate................................................. .006
Heptachlor................................................. .00004
Heptachlor epoxide......................................... .00002
Hexachlorobenzene.......................................... .0001
Hexachlorocyclopentadiene.................................. .0001
Lindane.................................................... .00002
Methoxychlor............................................... .0001
Oxamyl..................................................... .002
Picloram................................................... .0001
Polychlorinated biphenyls (PCBs) (as decachlorobiphenyl)... .0001
Pentachlorophenol.......................................... .00004
Simazine................................................... .00007
Toxaphene.................................................. .001
2,3,7,8-TCDD (Dioxin)...................................... .000000005
2,4,5-TP (Silvex).......................................... .0002
------------------------------------------------------------------------
(19) Anaylsis under this section shall only be conducted by
laboratories that have received certification by EPA or the State and
have met the following conditions:
(i) To receive certification to conduct analyses for the
contaminants in Sec. 141.61(c) the laboratory must:
(A) Analyze Performance Evaluation (PE) samples provided by EPA, the
State, or by a third party (with the approval of the State or EPA) at
least once a year by each method for which the laboratory desires
certification.
(B) For each contaminant that has been included in the PE sample
achieve quantitative results on the analyses that are within the
following acceptance limits:
------------------------------------------------------------------------
Contaminant Acceptance limits (percent)
------------------------------------------------------------------------
DBCP...................................... 40
EDB....................................... 40.
Alachlor.................................. 45.
Atrazine.................................. 45.
Benzo[a]pyrene............................ 2 standard deviations.
Carbofuran................................ 45.
Chlordane................................. 45.
Dalapon................................... 2 standard deviations.
Di(2-ethylhexyl)adipate................... 2 standard deviations.
Di(2-ethylhexyl)phthalate................. 2 standard deviations.
Dinoseb................................... 2 standard deviations.
Diquat.................................... 2 standard deviations.
Endothall................................. 2 standard deviations.
Endrin.................................... 30.
Glyphosate................................ 2 standard deviations.
Heptachlor................................