ISO 3329:1975
Ammonium nitrate for industrial use; Determination of content of sulphur compounds; Method by reduction and titrimetry
- Standard No.
- ISO 3329:1975
- Release Date
- 1975
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 3329:1975
- Scope
- Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 ?C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of sodium hydroxide solution and acetone. Titration of the sulphide with standard volumetric mercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure.
ISO 3329:1975 history
- 1975 ISO 3329:1975 Ammonium nitrate for industrial use; Determination of content of sulphur compounds; Method by reduction and titrimetry
