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AQ1 - USEPA Approved Methods

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AQ1 ENVIRONMENTAL METHODS LIST -USEPASEAL Analytical is continually developing methods. Please note that others may exist. If you do not see your chosen method on the downloadable list above please consult your SEAL Analytical Technical Support Team.

Method Detection Limits are calculated using USEPA procedure 40 CFR, Part 136, Appendix B
 ANALYTE  METHOD DESCRIPTION  METHOD NUMBER  METHOD DETECTION LIMIT  EQUIVALENCE
 ALKALINITY Buffered methyl orange color reduction
EPA-100-B Rev 0
EPA-102-B Rev 0
6.5 mg CaCO3/L (Range: 10 to 100 mg/L)
22 mg CaCO3/L (Range: 50 to 500 mg /L)
EPA 310.2 (1974)
 AMMONIA Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue)
EPA-103-B Rev 1
EPA-129-B Rev 1

0.008 mg N/L (Range: 0.02 to 1.0 mg/L)
0.05 mg N/L (Range: 0.25 to 10 mg/L)
EPA 350.1, version 2 (1993)
Std. Methods 4500-NH3 G (19th,20th)
 AMMONIA
Alkaline salicylate method with hypochlorite and sodium nitroprusside
 EPA-148-B Rev 0

 EPA-150-B Rev 0

 EPA-153-B Rev 0
0.006 mg N/L (Range: 0.02 to 1.0 mg/L)

0.016 mg N/L (Range: 0.1 to 5.0 mg/L)
 
0.016 mg N/L (Range: 0.1 to 10 mg/L)

EPA 350.1, version 2 (1993)
Std. Methods 4500-NH3 G (19th,20th
 CHLORIDE Mercuric thiocyanate reaction in the presence of ferric nitrate
EPA-105-B Rev 0
EPA-124-B Rev 0
0.4 mg/L (Range: 2.5 to 100 mg Cl/L)
0.8 mg/L (Range: 5 to 200 mg Cl/L)
Std. Methods
4500-Cl- E (18th,19th,20th)
 CHROMIUM, 
 Hexavalent
Hexavalent, chromium reaction with diphenylcarbazide
EPA-108-B Rev 0
EPA-109-B Rev 0
0.0004 mg/L (Range: 0.01 to 0.5 mg/L)
0.011 mg/L (Range: 0.3 to 5.0 mg Cr (Vl)/L)
Std, Methods
4500-Cr B (20th)
 COLOR Platinum-cobalt standard comparison  EPA-140-B Rev 0  2 Color Units (Range: 5 to 150 Color Units) Std. Methods
2120 B  (18th,
19th, 20th)
 CYANIDE Chloramine-T with pyridine barbituric acid color reaction
(Manual distillation required)
 EPA-130-B Rev 0
 0.0015 mg/L (Range:0.003 to 0.25 mg CN/L) EPA 335.4, Ver 1 (1993) Std. Methods
4500-CN E (18th, 19th,20th)

 

AQ1 ENVIRONMENTAL METHODS LIST - USEPA  
Method Detection Limits are calculated using USEPA procedure 40 CFR, Part 136, Appendix B
ANALYTE METHOD DESCRIPTION METHOD NUMBER METHOD DETECTION LIMIT EQUIVALENCE
NITROGEN,
Total Kjeldahl (TKN)
Kjeldahl digests (Hg catalyst) are reacted with alkaline salicylate in the presence of hypochlorite and sodium nitroprusside (Digestion required)
EPA-125-B Rev 0
EPA-110-B Rev 0

0.03 mg N/L (Range: 0.1 to 4.0 mg N/L)
0.2 mg N/L (Range: 0.5 to 24 mg N/L)
EPA 351.2,
Ver 2 (1993)
NITROGEN,
Total Kjeldahl (TKN)
Kjeldahl digests (Cu catalyst) are reacted with alkaline salicylate in the presence of hypochlorite and sodium nitroprusside (Digestion required)
EPA-111-B Rev 2
EPA-136-B Rev 2
0.07 mg N/L (Range: 0.2 to 4.0 mg N/L)
0.12 mg N/L (Range: 0.5 to 25 mg N/L)
EPA 351.2, Ver 2 (1993)
NITRATE + NITRITE Cadmium coil reduction followed by sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride


EPA-127-B Rev 1
EPA-126-B Rev 3
EPA-114-B Rev 1


0.003 mg N/L (Range: 0.012 to 2.0 mg N/L)
0.015 mg N/L (Range: 0.06 to 5.0 mg N/L)
0.04 mg N/L (Range: 0.25 to 15 mg N/L)

EPA 353.2 Ver 2 (1993) Std. Methods 4500-NO3F(18th,19th,20th)

NITRATE + NITRITE Cadmium coil reduction followed by sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride (Imidazole buffer used)

EPA-132-B Rev1

0.004 mg N/L (Range: 0.012 to 2.0 mg N/L)

N/A

NITRATE + NITRITE Vanadium(III) chloride reduction followed by sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride
EPA-160-B Rev 0
0.004 mg N/L (Range: 0.025 to 1.0 mg N/L) 40 CFR, Part 136.3
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride
EPA-115-B Rev 1
EPA-137-B Rev 0

0.002 mg N/L (Range: 0.015 to 1.2 mg N/L)
0.0001 mg N/L (Range: 0.0009 to 0.2 mg N/L)
EPA 353.2 Ver 2 (1993) Std. Methods 4500-NO3 F (18th,19th,20th)
PHENOLICS Sample distillates are reacted with alkaline ferricyanide and 4-aminoantipyrine (Manual distillation required)

EPA-117-B Rev 0

0.004 mg phenol/L (Range: 0.01 to 0.4 mg phenol/L) EPA 420.4 ver 1 (1993)
PHOSPHATE, Ortho Acidic molybdate/antimony with ascorbic acid reduction (phosphomolybdenum blue)
EPA-155-B Rev 0
EPA-118-B Rev 1
EPA-145-B Rev 1
EPA-146-B Rev 0

0.0008 mg P/L (Range: 0.003 to 0.3 mg P/L)
0.002 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.005 mg P/L (Range: 0.05 to 5.0 mg P/L)
0.01 mg P/L (Range: 0.125 to 12.5 mg P/L)
EPA 365.1 Ver 2 (1993) Std. Methods 4500-P F (18th,19th,20th)

 

AQ1 ENVIRONMENTAL METHODS LIST- USEPA  
Method Detection Limits are calculated using USEPA procedure 40 CFR, Part 136, Appendix B
ANALYTE METHOD DESCRIPTION METHOD NUMBER METHOD DETECTION LIMIT EQUIVALENCE
PHOSPHORUS,
Total(TP)
Acidic molybdate/antimony withascorbic acid reduction (Manual persulfate digestion required)
EPA-119-B Rev 0
EPA-134-B Rev 0
0.002 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.006mg P/L (Range: 0.05 to 5.0 mg P/L)

EPA 365.1
Std. Methods 4500-P F
(18th,19th,20th)
PHOSPHORUS,
Total (TKP)
Kjeldahl digests (Hg catalyst) are reactedwith acidic molybdate/antimony with ascorbic acid reduction

EPA-120-B Rev 0

0.007 mg P/L (Range: 0.04 to 3.2 mg P/L) EPA 365.4
PHOSPHORUS,
Total Kjeldahl
(TKP)
Kjeldahl digests (Cu catalyst) are reacted with acidic molybdate/antimony with ascorbic acid reduction. Method range depends on digestion protocol
EPA-135-B Rev 0
EPA-138-B Rev 0
0.009 mg P/L (Range: 0.04 to 3.2 mg P/L)
TBD mg P/L (Range: 0.05 to 3.0 mg P/L)
N/A
 SULFATE Barium chloride turbidimetric method with use of gelatine as suspension agent EPA-165-B Rev 0  0.18 mg/L (Range 5 to 40 mg/L)  ASTM D516-11
SILICA
(Reactive silica)
Acidic molybdate, no reduction
(molybdo-silicic acid)

EPA-121-B Rev 1

0.07 mg/L (Range: 0.25 to 25 mg/L)

Std. Methods 4500-SiO2 C
(20th)
SILICA
(Reactive silica)
Acidic molybdate, ANSA reduction
(silico-molybdenum blue)
EPA-122-A Rev 0 0.018 mg/L (Range: 0.1 to 10 mg/L) Std. Methods 4500-SiO2 D
(20th)

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