ISO 5314:1981 Preview
Fertilizers -- Determination of ammoniacal nitrogen content -- Titrimetric method after distillation
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
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.
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