ISO 7408:1983

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

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

PUBLISH DATE 1983

The method consists in entraining, by means of a strong current of air, the ammonia from a moderately alkaline test mixture at ambient temperature into standard volumetric sulfuric acid solution.

It involves back-titrating the excess sulfuric acid solution with standard volumetric sodium hydroxide solution.

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