ISO 2997:1974
Phosphoric acid for industrial use; Determination of sulphate content; Method by reduction and titrimetry
- Standard No.
- ISO 2997:1974
- Release Date
- 1974
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 2997:1974
- Scope
- Applicable to products having sulphate contents equal to or more than 0.0005 % (m/m). Analysis by reduction of the sulphate to sulphide by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of acetone and sodium hydroxide solution. Titration with a standard volumetric solution of mercury(II) acetate in the presence of dithizone as indicator. Has also been approved by the IUPAC.
ISO 2997:1974 history
- 1974 ISO 2997:1974 Phosphoric acid for industrial use; Determination of sulphate content; Method by reduction and titrimetry
