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ISO 2997:1974

Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry

Nov 1, 1974

General information

90.93     Oct 20, 2023

ISO

ISO/TC 47

International Standard

71.060.30  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 847:1968

NOW

PUBLISHED
ISO 2997:1974
90.93 Standard confirmed
Oct 20, 2023