Product Short Description: 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. Product Description: ::Very simple 3 step procedure :: Applications and Industries: Industrial process waters, boiler water, cooling waters Chemistry: Results are expressed in ppm (mg/L) sodium nitrite (NaNO2).