90.92 Standard to be revised Jun 19, 2023
ISO
ISO/TC 134 Fertilizers, soil conditioners and beneficial substances
International Standard
65.080 Fertilizers
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.
PUBLISHED
ISO 5314:1981
90.92
Standard to be revised
Jun 19, 2023
IN_DEVELOPMENT
ISO/CD 5314