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ISO 7408:1983Published

Fertilizers — Determination of ammoniacal nitrogen content in the presence of other substances which release ammonia when treated with sodium hydroxide — Titrimetric method

Engrais — Dosage de l'azote ammoniacal en présence d'autres substances libérant de l'ammoniac sous l'effet d'hydroxyde de sodium — Méthode titrimétrique

Abstract / scope

The method consists in entraining, by means of a strong current of air, of the ammonia from a moderately alkaline test mixture at ambient temperature into standard volumetric sulfuric acid solution, and back-titrating of the excess sulfuric acid solution with standard volumetric sodium hydroxide solution.