ISO 3332:1975

Current Revision
Ammonium sulphate for industrial use -- Determination of ammoniacal nitrogen content -- Titrimetric method after distillation

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ISO 3332:1975

Ammonium sulphate for industrial use -- Determination of ammoniacal nitrogen content -- Titrimetric method after distillation

PUBLISH DATE 1975
ISO 3332:1975

Based on dissolution of a test sample in water, distillation of the ammonia after displacement by an alkali solution.

Absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator.

A typical distillation apparatus is shown in a figure.

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