ISO 3197:1975

Sodium hydroxide for industrial use — Determination of chlorides content — Photometric method ISO 3197:1975

Publication date:   Mar 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 having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50 mg/kg the method specified in ISO 981 shall be used. The principle consists in the quantitative displacement of the thiocyanate ions of the mercury(II) thiocyanate by the cloride ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate to form iron(III) thiocyanate (red). Photometric measurement of the colour at a wavelength of about 450 nm.

Life cycle

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WITHDRAWN
ISO 3197:1975
95.99 Withdrawal of Standard
May 27, 2002