AQ400 - USEPA Approved Methods

 

 AQ400 Discrete Analyzer
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AQ400 ENVIRONMENTAL METHODS LIST- USEPASEAL 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 AQ400 Specialty Methods List                                              Link to additional AQ400 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-C Rev 0
EPA-101-C Rev 0
EPA-102-C Rev 0

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-129-C Rev 0  
EPA-103-C Rev 0  

 

0.04 mg N/L (Range: 0.2 to 10.0 mg N/L)
0.004 mg N/L (Range: 0.02 to 2.0 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 Rev 0 





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 Rev 0
EPA-150-C Rev 0
EPA-153-C Rev 0




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)
AMMONIA

 Method in development

   0.02 to  2.0mg N/L

 
CHLORIDE




Mercuric thiocyanate reaction in the presence of ferric nitrate



EPA-124-C Rev 0  
EPA-105-C Rev 0  


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 Rev 0  
EPA-109-C Rev 2  

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 Rev 1


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 Rev 0   




 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 Rev 1


 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 Rev 3

 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 Rev 5
EPA-110-C Rev 5



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-C Rev 8
EPA-136-C Rev 7
EPA-136-C Rev 0


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)
TBD mg/ N/L (Range: 0.5 to 25mg N/L)


EPA 351.2, Ver 2 (1993)


TKN Method in development    0.5 to 25 mg N/L  
NITRATE + NITRITE




Cadmium coil reduction followed by sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride


EPA-126-C Rev 0
EPA-127-C Rev 8
EPA-114-C Rev 9



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 Rev1

 

 

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 Rev 0



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 Rev 1
EPA-142-C Rev 2



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 Rev 1
EPA-137-C Rev 1



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 Rev 0


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 Rev 4



 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 Rev 8


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 Rev 0
EPA-118-C Rev 5
EPA-145-C Rev 1
EPA-146-C Rev 0
EPA-134-C Rev 5

0.0015 mg P/L (Range: 0.01 to 1.0 mg P/L)
0.002mg 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)
0.006 mg P/L (Range: 0.05 to 5.0 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-134-C Rev 0



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 Rev 6

 

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 Rev 4




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 Rev 2

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 Rev 9

0.018 mg/L (Range: 0.1 to 10.0 mg/L)

Std. Methods 4500-SiO2 D
(20th)
SULFATE

Barium chloride turbidimetric method

EPA-123-C Rev 5

1.0 mg/L (Range: 5 to 40 mg/L)

ASTM D516-90, 02