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ISO 2997:1974
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ISO 2997:1974 Phosphoric acid for industrial use -- Determination of sulphate content -- Method by reduction and titrimetry
standard by International Organization for Standardization, 11/01/1974
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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.