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.
Document identifier
ISO 5314:1981
Title
Fertilizers - Determination of ammoniacal nitrogen content - Titrimetric method after distillation
ISO Category
TC 134/SC 4: Chemical analysis - STANDBY
Publication date
1981-05-01
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