This method is for determination of nitrite in drinking, surface and saline waters, domestic and industrial wastes. The diazonium compound formed by diazotation of sulfanilamide by nitrite in water under acid conditions is coupled with N-(1-naphthyl) ethylenediamine dihydrochloride to produce a reddish-purple color which is read in a spectrophotometer at 540 nm.
The method is applicable in the range from 0.01 to 1.0 mg nitrite-nitrogen/L.
Oxidants and reductants affect nitrite concentrations and alkalinity > 600 mg/L will give low results due to a shift in pH.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 48 hours from sample collection to analysis. |
| Preservatives: | Store samples at 4°C. |
| Required Preps: | 100 mL HDPE or amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Spectrophotometry |
| Documentation: | 
354.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Nitrite | NO2- |
14797-65-0 |
0.01 |
mg/L |
| Nitrogen | N2 |
7727-37-9 |
0.01 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.