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download between 0-24 hoursReleased: 1974
ISO 2997:1974
ISO 2997:1974-Phosphoric acid for industrial use-Determination of sulphate content
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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.