ISO 3331:1975 PDF
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Ammonium nitrate for industrial use — Determination of total nitrogen content — Titrimetric method after distillation
Based on the conversion of nitrate into ammonia by means of Devarda’s alloy in alkaline solution together with the liberation of ammonia from ammonium ions. Distillation of the ammonia from both reactions, absorption in an excess of 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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| Edition | 1975 |
|---|---|
| Published Date | 1975 |
| Published By | International Standardization Organisation |
| Page Count | 4 |
