International Standard
ISO 2997:1974
Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
Reference number
ISO 2997:1974
Edition 1
1974-11
© ISO 2024
International Standard
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Published (Edition 1, 1974)
This standard was last reviewed and confirmed in 2023. Therefore this version remains current.

ISO 2997:1974

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CHF 42
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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 1974-11
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 3
  • Technical Committee :
    ISO/TC 47
    ICS :
    71.060.30 
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