Nitrite, an intermediate in the nitrogen cycle, is formed during the decomposition of organic matter but readily oxidies to form nitrate. These processes occur in wastewater treatment plants, water distribution systems, and natural waters. Nitrites are useful as corrosion inhibitors, preservatives, pigmetns, and in manufacturing many organic preservative chemicals.
Azo Dye Formation Method
References: APHA Standard Methods, 23rd 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
WARNING! This product can expose you to chemicals including ethylene glycol, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.