ISO 1592:1977
$12.35
Urea for industrial use — Determination of nitrogen content — Titrimetric method after distillation
| Published By | Publication Date | Number of Pages |
| ISO | 1977-11 | 6 |
The procedure is based on the catalytic conversion of nitrogen present in a test portion to ammonia by heating in concentrated sulphuric acid solution. Distillation and absorption of the ammonia in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of an indicator. – Replaces ISO Recommendation R 1592-1970.
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