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AQ2 - USEPA Approved Methods

 

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DISCRETE ANALYZER ENVIRONMENTAL METHODS LIST (USEPA)SEAL Analytical is continually developing methods. Please note that others may exist. If you do not see your chosen method on this list, please consult your SEAL Analytical Technical Support Team.
Link to additional Specialty Methods List                         Link to additional Agricultural Methods List
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 
EPA-101 

EPA-102 

6.5 mg CaCO3 /L (Range: 10 to 100 mg/L)
8 mg CaCO3 /L (Range: 15 to 200 mg/L)
16 mg CaCO3 /L (Range: 50 to 500 mg/L)
EPA 310.2
 AMMONIA Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue)

EPA-103

EPA-129
0.004 mg N/L (Range: 0.02 to 2.0 mg N/L)
0.05 mg N/L (Range: 0.2 to 10 mg N/L)
EPA 350.1, version 2 (1993)
Std. Methods 4500-NH3 G (19th,20th)
 AMMONIA Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue). This is a brackish method.  EPA-104  0.07 mg N/L (Range: 0.2 to 5.0 mg N/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
EPA-150

EPA-153
0.005 mg N/L (Range: 0.02 to 1.0 mg N/L)
0.016 mg N/L (Range: 0.1 to 5.0 mg N/L)
0.02 mg N/L (Range: 0.2 to 10 mg N/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
EPA-124
0.3 mg/L (Range: 2 to 100 mg/L)
0.4 mg/L (Range: 5 to 200 mg/L)
Std. Methods
4500-Cl- E (18th,19th,20th)
 CHROMIUM, 
 Hexavalent
Hexavalent chromium reaction with diphenylcarbazide
EPA-108
EPA-109
0.0005 mg Cr(VI)/L (Range: 0.01 to 0.5 mg/L)
0.011 mg Cr(VI)/L (Range: 0.3 to 5.0 mg/L)
Std, Methods
3500-Cr B (20th)
 COLOR Platinum-cobalt standard comparison  EPA-140  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
 1.0 μL CN/L (Range:3.0 to 250 μL CN/L) EPA 335.4, Ver 1 (1993) Std. Methods
4500-CN E (18th, 19th,20th)
 CYANIDE Amenable to chlorination
(Without distillation)
 EPA-133  0.4 μL CN/L (Range:2.0 to 300 μL CN/L) Std. Methods 4500-CN H (20th)
 
 HARDNESS,   
 Total


Calmagite indicator reaction


 EPA-106

 11 mg CaCO3/L (Range: 25 to 400 mg/L)


EPA 130.1


DISCRETE ANALYZER ENVIRONMENTAL METHODS LIST  
USEPA Rev 41 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
EPA-110

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
EPA-136

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
EPA-126
EPA-114

0.003 mg N/L (Range: 0.012 to 2.0 mg N/L)
0.01 mg N/L (Range: 0.06 to 5 mg N/L)
0.03 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

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
0.004 mg N/L (Range: 0.025 to 1.0 mg N/L) 40 CFR, Part 136.3
NITRATE + NITRITE Nitrate is chemically reduced to nitrite by alkaline hydrazine sulfate, in the presence of copper(II)

EPA-141
EPA-142
0.005 mg N/L (Range: 0.02 to 1.5 mg N/L)
0.03 mg N/L (Range: 0.2 to 5.0 mg N/L)
EPA 353.1 (1993) Std. Methods 4500-NO3H (18th,19th,20th)
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride

EPA-115
EPA-137
0.0008 mg N/L (Range: 0.015 to 1.5 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)
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride

EPA-116

EPA-112

0.0002 mg N/L (Range: 0.0009 to 0.2 mg N/L)

0.0006 mg N/L (Range: 0.015 to 1.5 mg N/L)
Std Methods 4500-NO2B(18th,19th,20th)
PHENOLICS Sample distillates are reacted with alkaline ferricyanide and 4-aminoantipyrine (Manual distillation required)


EPA-117

0.0025 mg phenol/L (Range: 0.005 to 0.25mg/L)

EPA 420.4 ver 1 (1993)
PHOSPHATE, Ortho Acidic molybdate/antimony with ascorbic acid reduction (phosphomolybdenum blue)

EPA-155
EPA-118
EPA-145
EPA-146
0.0006 mg P/L (Range: 0.003 to 0.3mg 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)
0.013 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)
PHOSPHORUS, Total (TP) Acidic molybdate/antimony with ascorbic acid reduction (Manual persulfate digestion required)

EPA-119
EPA-134

0.003 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.006 mg P/L (Range: 0.065to 5.0 mg P/L)
EPA 365.1 Ver 2 (1993) Std. Methods 4500-P B, F (18th,19th,20th)

 

DISCRETE ANALYZER ENVIRONMENTAL METHODS LIST  
USEPA Rev 41 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 Kjeldahl (TKP)
Kjeldahl digests (Hg catalyst) are reacted with acidic molybdate/antimony with ascorbic acid reduction

EPA-120

0.007 mg P/L (Range: 0.04 to 3.2 mg P/L) EPA 365.4 (1983)
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

0.009 mg P/L (Range: 0.04 to 3.2 mg P/L)
N/A
SILICA
(Reactive silica)
Acidic molybdate, no reduction
(molybdo-silicic acid)

EPA-121

0.1 mg silica/L (Range: 0.25 to 25 mg silica/L) Std. Methods 4500-SiO2 C
(20th)
SILICA
(Reactive silica)
Acidic molybdate with ANSA reduction (silico-molybdenum blue)

EPA-122

0.018 mg silica/L (Range: 0.1 to 10.0 mg silica/L) Std. Methods 4500-SiO2 D
(20th)
SULFATE Barium chloride turbidimetric method

EPA-123

1.0 mg/L (Range: 5 to 40 mg/L) ASTM D516-90, 02
SULFATE  Barium chloride turbidimetric method with use of gelatine as suspension agent EPA-165  0.09 mg/L (Range: 5.0 to 40 mg/L)  ASTM D516-11

 

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