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Homepage>ISO Standards>ISO 2997:1974-Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
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download between 0-24 hoursReleased: 1974
ISO 2997:1974-Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry

ISO 2997:1974

ISO 2997:1974-Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry

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Standard´s number:ISO 2997:1974
Pages:3
Edition:1
Released:1974
DESCRIPTION

ISO 2997:1974


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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