Because of the selective activity to azotobacter, nitrapyrin can be used as nitrogen nitration inhibitor and soil bactericide, and can delay the nitration of ammonium ion in soil when used together with urea and nitrogen fertilizer. Nitrapyrin, the active ingredient in N-Serve‰ and Stay N 2000", inhibits (temporarily slows, but does not stop) the nitrification process at the conversion of ammonium to nitrite. By slowing nitrification, nitrapyrin slows the formation of nitrate. If more ammonium remains in the soil during a wet period then less nitrate is present and subject to loss. Nitrapyrin is not foolproof. It is degraded predominantly in soil by chemical hydrolysis, which lessens effectiveness over time. Degradation is temperature dependent, so warm soils that speed nitrification also speed nitrapyrin breakdown, which means effectiveness is lower, nitrification reestablishes more quickly, and longevity is shorter.
Molecular formula: C6H3Cl4N
Molecular weight: 230.9
Common Name: nitrapyrin(BSI, E-ISO, ANSI); nitrapyrine((f)F-ISO)
Commodity Name: N-Serve
Chemical Name: 2-chloro-6-trichloromethylpyridine
Physical Properties: white crystal solid, mp 62-63 C, the vapor pressure is 370 mpt (23 C), difficult to dissolve in water, the solubility in water is 40mg/kg (22 C), easy soluble in propanone, methyl dichloride, dimethyl benzene.
Toxicity: acute oral for rats, LD50: 1072-1231 ny/kg
TC: (purity) 90%