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ISO 3332:1975

Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation ISO 3332:1975

Publication date:   Jul 1, 1975

General information

90.93 Standard confirmed   Jul 19, 2019

ISO

ISO/TC 47 Chemistry

International Standard

71.060.50   Salts

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Scope

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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PUBLISHED
ISO 3332:1975
90.93 Standard confirmed
Jul 19, 2019