ISO 3198:1975

Sodium hydroxide for industrial use — Determination of sulphur compounds — Method by reduction and titrimetry ISO 3198:1975

Publication date:   Aug 1, 1975

95.99 Withdrawal of Standard   May 27, 2002

General information

95.99 Withdrawal of Standard   May 27, 2002

ISO

ISO/TC 47 Chemistry

International Standard

71.060.40   Bases

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Scope

Applicable to products the content of which, expressed as sulphate, is equal or more than 5 mg/kg. The principle consists in the reduction of the sulphur compounds to hydrogen sulphide by heating with a mixture of hydriodic acid and hypophosphorous acid. Distillation of the hydrogen sulphide by a current of oxygen-free nitrogen in a mixture of sodium hydroxide and acetone. Titration of the sulphide with standard volumetric mercury(II) nitrate solution in the presence of dithizone as indicator.

Life cycle

NOW

WITHDRAWN
ISO 3198:1975
95.99 Withdrawal of Standard
May 27, 2002

REVISED BY

ABANDON
ISO/CD 3198