ISO 3332:1975
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Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
| Published By | Publication Date | Number of Pages |
| ISO | 1975-07 | 6 |
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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