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ISO 5314:1981
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ISO 5314:1981 Fertilizers - Determination of ammoniacal nitrogen content - Titrimetric method after distillation
standard by International Organization for Standardization, 05/01/1981
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Full Description
The method consists in distilling of the ammonia from an alkaline solution, absorbing in an excess of standard volumetric sulphuric acid solution and back-titrating with standard volumetric sodium hydroxide solution. It is applicable only in the absence of urea or its derivatives, of cyanamide and of organic nitrogenous compounds.