| ANALYTE |
METHOD DESCRIPTION |
METHOD NUMBER |
METHOD DETECTION LIMIT |
EQUIVALENCE |
| HARDNESS, Total |
Calmagite indicator reaction |
EPA-106-A Rev 2 |
11 mg CaCO3 /L (Range: 25 to 400 mg/L) |
EPA 130.1 |
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-A Rev 5 |
| EPA-110-A 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-A Rev 4 |
| EPA-136-A Rev 3 |
|
| 0.035 mg N/L (Range: 0.1 to 4.0 mg N/L) |
| 0.15 mg N/L (Range: 0.4 to 24 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-A Rev 7 |
| EPA-126-A Rev 7 |
| EPA-114-A Rev 7 |
|
| 0.003 mg N/L (Range: 0.012 to 2.0 mg N/L) |
| 0.006 mg N/L (Range: 0.03 to 4.5 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-NO3 F(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-A Rev 1 |
0.004 mg N/L (Range: 0.012 to 2.0 mg N/L) |
N/A |
| NITRATE + NITRITE |
Nitrate is chemically reduced to nitrite by alkaline hydrazine sulfate, in the presence of copper(II) |
| EPA-141-A Rev 1 |
| EPA-142-A Rev 1 |
|
| 0.005 mg N/L (Range: 0.02 to 1.5 mg N/L) |
| 0.01 mg N/L (Range: 0.08 to 4.0 mg N/L) |
|
EPA 353.1 Ver 2 (1993) Std. Methods 4500-NO3 H (18th,19th,20th) |
| NITRITE |
Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride |
| EPA-115-A Rev 3 |
| EPA-137-A Rev 1 |
|
| 0.0025 mg N/L (Range: 0.015 to 1.2 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 (18th,19th,20th ) |
| NITRITE |
Sulfanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride |
EPA-116-A 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-A Rev 5 |
0.003 mg/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-118-A Rev 4 |
| EPA-128-A Rev 5 |
|
| 0.0015 mg P/L (Range: 0.005 to 1.0 mg P/L) |
| 0.005 mg P/L (Range: 0.32 to 20 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-A Rev 5 |
| EPA-134-A Rev 3 |
|
| 0.002 mg P/L (Range: 0.01 to 1.0 mg P/L) |
| 0.007 mg P/L (Range: 0.063 to 5.0 mg P/L) |
|
EPA 365.1 Ver 2 (1993) Std. Methods 4500-P B, F (18th,19th,20th) |