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

ISO-3332 - 1ST EDITION - CURRENT


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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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Document Number

ISO 3332:1975

Revision Level

1ST EDITION

Status

Current

Publication Date

July 15, 1975

Committee Number

ISO TC 47