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Norm
ISO 2997:1974
Issue date: 1974 11 01
Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
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...
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Valid
Publisher:
International Organization for Standardization
Format:
Digital | 3 Pages
Language:
English
ICS
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
1974 11 01
Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and tit...
Norm
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