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Nitrite Testing

*Nitrite Testing

Methods

Nitrite, an intermediate in the nitrogen cycle, is formed during the decomposition of organic matter but readily oxidizes to form nitrate. These processes occur in wastewater treatment plants, water distribution systems, and natural waters. Nitrites are useful as corrosion inhibitors, preservatives, pigments, and in manufacturing many organic preservative chemicals. A Maximum Contaminant Level of 1 mg/L has been established by the USEPA for nitrite-nitrogen in drinking water.

Azo Dye Formation Method

Reference: APHA Standard Methods, 22nd.ed., Method 4500-NO2¯ B- 2000. USEPA Methods for Chemical Analysis of Water and Wastes, Method 354.1 (1983).

Nitrite diazotizes with a primary aromatic amine in an acidic solution to produce a highly colored azo dye. The intensity of the color is directly proportional to the concentration of nitrite in the sample. Nitrate will not interfere. Results are expressed as ppm (mg/L) NO2-N.

The Ceric Sulfate Titrimetric Method

Reference: Developed by CHEMetrics, Inc.

Ceric sulfate is the titrant and ferroin is the end point indicator. The method is free from glycol interference in samples that contain up to 75% glycol, making it particularly applicable to systems that contain nitrite corrosion inhibitors. Results are expressed as ppm (mg/L) NaNO2.


Nitrite CHEMets Visual Kit

Item No. Description
K7004 Nitrite CHEMets Kit 0-2.5 ppm as N, Ea

Nitrite Titrets Kit

Item No. Description
K7025 Nitrite Titrets Kit 250-2500 ppm as NaNO2, Ea

NItrite Vacu-vials Instrumental Kit

Item No. Description
K7003 Nitrite Vacu-vials Kit 0-1.00 ppm as N, Ea

Nitrite VACUettes Kit

Item No. Description
K7004D Nitrite VACUettes Kit 0-80 ppm as N, Ea

Refills for Nitrite CHEMets Kit

Item No. Description
R7002 Nitrite CHEMets Refill 0-2.5 ppm as N, Ea