Click on a catalog number in the tables below for more information or to purchase a test kit.
Range | MDL | Method | Kit Catalog No. | Refill Catalog No. |
---|---|---|---|---|
0-2.5 ppm as N | 0.2 ppm | Azo Dye Formation | K-7004 | R-7002 |
0-80 ppm as N | 4 ppm | Azo Dye Formation | K-7004D | R-7002D |
0-170 ppm as N | 10 ppm | Azo Dye Formation | K-7004A | R-7002A |
0-300 ppm as N | 20 ppm | Azo Dye Formation | K-7004B | R-7002B |
0-3000 ppm as N | 200 ppm | Azo Dye Formation | K-7004C | R-7002C |
250-2500 ppm as NaNO₂ | 250 ppm | Ceric Sulfate Titrant with Ferroin Indicator | K-7025 | |
500-5000 ppm as NaNO₂ | 500 ppm | Ceric Sulfate Titrant with Ferroin Indicator | K-7050 |
Range | Method | Kit Catalog No. |
---|---|---|
0-1.00 ppm as N | Azo Dye Formation | K-7003 |
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.