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ISO 7408:1983

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

Publication date:   Dec 1, 1983

General information

90.93 Standard confirmed   May 23, 2023

ISO

ISO/TC 134 Fertilizers, soil conditioners and beneficial substances

International Standard

65.080   Fertilizers

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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.

Life cycle

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PUBLISHED
ISO 7408:1983
90.93 Standard confirmed
May 23, 2023