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Methods

Methods Discrete Methods AQ400 EPA Methods

AQ400 - USEPA Approved Methods

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AQ400 ENVIRONMENTAL METHODS LIST- USEPA

 ANALYTE  METHOD DESCRIPTION  METHOD NUMBER  METHOD DETECTION LIMIT  EQUIVALENCE
ALKALINITY  Buffered methyl orange color reduction EPA-100-C
EPA-101-C
EPA-102-C		 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 (1974)
AMMONIA Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol  blue)
EPA-103-C
EPA-129-C
0.004 mg N/L (Range: 0.02 to 2.0 mg N/L)
0.04 mg N/L (Range: 0.2 to 10.0 mg N/L)
 EPA 350.1, version 2 (1993) Std. Methods 4500-NH3 G (1997, 19th 20th)
AMMONIA Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue). This is a brackish method. EPA-104-C  0.07 mg N/L (Range: 0.2 to 2.0 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-C
EPA-150-C
EPA-153-C

 0.002 mg N/L (Range: 0.01 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 (1997, 19th, 20th)
CHLORIDE Mercuric thiocyanate reaction in the presence of ferric nitrate
 

 

 

EPA-124-C
EPA-105-C

 

 
 

0.4 mg Cl/L (Range: 5 to 200 mg Cl/L)
0.3 mg Cl/L (Range: 2 to 100 mg Cl/L)

 Std. Methods 4500-Cl- E (1997,18th, 19th , 20th)
CHROMIUM,  Hexavalent Hexavalent chromium reaction with diphenylcarbazide
 

EPA-108-C
EPA-109-C

 
 

0.0005 mg (Range: 0.003 to 0.5 mg Cr(Vl)/L)
0.011 mg/L (Range: 0.3 to 5.0 mg Cr (Vl)/L)

 Std, Methods 3500-Cr B (2009, 20th)
COLOR Platinum-cobalt standard comparison EPA-140-C 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-C  0.0007 mg CN/L (Range:0.002 to 0.25 mg/L) EPA 335.4, Ver 1 (1993) Std. Methods 4500-CN E (1999)
CYANIDE Amenable to chlorination (Without distillation) EPA-133-C  0.0004 mg CN/L (Range:0.002 to 0.3 mg/L) Std. Methods 4500-CN H (20th)
  HARDNESS,     Total Calmagite indicator reaction
EPA-106-C
  11 mg CaCO3/L (Range: 25 to 400 mg/L) EPA 130.1 (1971)

 

AQ400 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-C
EPA-110-C
EPA-151-C
EPA-158-C

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)
0.04 mg N/L (Range: 0.25 to 10 mg N/L)
0.05 mg N/L (Range: 0.5 to 25 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-C
EPA-136-C
EPA-151-C
EPA-158-C

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)
0.04 mg N/L (Range: 0.25 to 10 mg N/L)
0.05 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-126-C
EPA-127-C
EPA-114-C

0.007 mg N/L (Range: 0.04 to 5.0 mg N/L)
0.003 mg N/L (Range: 0.012 to 2.0 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(2000, 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-C

 

 

 0.004 mg N/L (Range: 0.012 to 2.0 mg N/L) N/C
NITRATE + NITRITE Vanadium(III) chloride reduction followed by sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride EPA-160-C 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-C
EPA-142-C

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 (1978) Std. Methods 4500-NO3-H (18th,19th,20th)
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride

EPA-115-C
EPA-137-C

0.0008 mg N/L (Range: 0.015 to 1.5 mg N/L)
0.0006 mg N/L (Range: 0.002 to 0.2 mg N/L)

 EPA 353.2 Ver 2 (1993) Std. Methods 4500-NO3 F, (2000, 18th, 19th,20th)
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride (No buffer used)

EPA-112-C

 

 0.0005 mg N/L (Range: 0.015 to 1.5 mg N/L) EPA 353.2 Ver 2 (1993) Std. Methods 4500-NO3 B (2000)
NITRITE Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride  EPA-116-C  0.0005 mg N/L (Range: 0.002 to 0.24 mg N/L) Std. Methods 4500-NO2 B (18th, 19th, 20th)
PHENOLICS Sample distillates are reacted with alkaline ferricyanide and 4-aminoantipyrine (Manual distillation required)

EPA-117-C

 

0.0025 mg/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-118-C
EPA-145-C
EPA-146-C

0.0015 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.005 mg P/L (Range: 0.05 to 5 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 (2000, 18th, 19th,20th)
PHOSPHORUS, Total (TP) Acidic molybdate/antimony with ascorbic acid reduction (Manual persulfate digestion required)

EPA-119-C
EPA-134-C

0.003 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.007 mg P/L (Range: 0.025to 5.0 mg P/L)

 EPA 365.1 Ver 2 (1993) Std. Methods 4500-P B, F (2000)

 

AQ400 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 EQUIVALENCEE
PHOSPHORUS, Total Kjeldahl (TKP) Kjeldahl digests (Hg catalyst) are reacted with acidic molybdate/antimony with ascorbic acid reduction

EPA-120-C

 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-C

0.009 mg P/L (Range: 0.04 to 3.2 mg P/L)

 N/C
SILICA (Reactive silica) Acidic molybdate, no reduction (molybdo-silicic acid)

EPA-121-C

 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-C

 0.018 mg/L (Range: 0.1 to 10.0 mg/L) Std. Methods 4500-SiO2 D (20th)
SULFATE Barium chloride turbidimetric method EPA-165-C 0.09 mg SO4/L (Range: 5.0 to 40 mg/L) ASTM D516-90, 02

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