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

Standard No.

ISO 3332:1975

Release Date

1975

Published By

International Organization for Standardization (ISO)

Latest

ISO 3332:1975

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.

ISO 3332:1975 history

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