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.
Life cycle
NOW
PUBLISHED SSH ISO 5314:1981 60.60
Standard published 31 tet 2011
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English