Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase

Importancia y uso:

5.1 This test method replaces Methods D1254 (Nitrite) and D992 (Nitrate). The nitrite test method (Method D1254) used a reagent that is considered to be a potential carcinogen. The nitrate test method (Method D992) has been shown to have relatively large errors when used in wastewaters and also has greater manipulative difficulties than the test method described herein.

5.2 This test method can be used in place of Test Methods D3867 (Nitrite-Nitrate). Test Methods D3867 uses cadmium for the reduction of nitrate to nitrite. Cadmium is considered a toxic metal. Also, the heterogeneous cadmium reductant creates greater difficulty than the reduction described in this test method.

Subcomité:

D19.05

Referida por:

D3867-16R21E01, D8083-16R23

Volúmen:

11.02

Número ICS:

13.060.50 (Examination of water for chemical substances)

Palabras clave:

cadmium reduction; discrete analyzer; enzyme; nitrate; nitrate plus nitrite; nitrate reductase; nitrite;