Active standard | Published: 01/11/1974

ISO 2997:1974

Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
(Acide phosphorique a usage industriel — Dosage des sulfates — Méthode par réduction et titrimétrie)

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Detail information

Designation: ISO 2997:1974

Publication date: 01/11/1974

Pages: 3

Country: International technical standard

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Anotation

Description / 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.

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