International Standard
ISO 3332:1975
Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
Reference number
ISO 3332:1975
ISO 3332:1975
Edición 1
1975-07
1975-07
© ISO 2024
International Standard
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ISO 3332:1975
8597
No disponible en español
Publicado
(Edición 1, 1975)
Esta norma se revisó y confirmó por última vez en 2019.
Por lo tanto, esta versión es la actual.
Resumen
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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