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sklademVydáno: 1975
ISO 3332:1975
ISO 3332:1975-Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
Měna
| Označení normy: | ISO 3332:1975 |
| Počet stran: | 4 |
| Vydání: | 1 |
| Vydáno: | 1975 |
Popis
ISO 3332:1975
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.