Reference number
ISO 2997:1974
International Standard
ISO 2997:1974
Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
Edition 1
1974-11
Read sample
ISO 2997:1974
8047
Published (Edition 1, 1974)
This publication was last reviewed and confirmed in 2023. Therefore this version remains current.

ISO 2997:1974

ISO 2997:1974
8047
Language
Format
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

  •  : Published
     : 1974-11
    : International Standard confirmed [90.93]
  •  : 1
     : 3
  • ISO/TC 47
    71.060.30 
  • RSS updates

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