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ISO 1592:1977

Urea for industrial use -- Determination of nitrogen content -- Titrimetric method after distillation

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Kehtetu alates 27.05.2002
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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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