International Organization for Standardization (ISO)
Status
2002-05
Latest
ISO 3330:1975
Scope
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.
ISO 3330:1975 history
1975ISO 3330:1975 Ammonium nitrate for industrial use; Determination of ammoniacal nitrogen content; Titrimetric method after distillation