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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 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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