Ammonium sulphate for industrial use — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
NORMA vydaná dňa 1.7.1975
Designation standards: ISO 3332:1975
Publication date standards: 1.7.1975
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: International technical standard
Kategória: Technické normy ISO
Description / Abstract: Based on dissolution of a test sample in water, distillation of the ammonia after displacement by an alkali solution. Absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.