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ISO 3332:1975
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ISO 3332:1975 Ammonium sulphate for industrial use -- Determination of ammoniacal nitrogen content -- Titrimetric method after distillation
standard by International Organization for Standardization, 07/01/1975
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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.