ISO 7108:1985 Preview
Ammonia solution for industrial use -- Determination of ammonia content -- Titrimetric method
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
A test portion is introduced into a solution of boric acid and the solution obtained is titrated with a standard volumetric solution of sulfuric acid in the presence of methyl red as indicator. The method is applicable to solutions containing not more than 35 % (m/m) of ammonia.