ISO 3138:1974

Anhydrous hydrogen fluoride for industrial use — Determination of non-volatile acid content — Titrimetric method ISO 3138:1974

Publication date:   Dec 1, 1974

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

71.060.30   Acids

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Scope

Applicable to contents of between 0.005 % (m/m) and 0.3 % (m/m) expressed in sulphuric acid. Preparation of the samples according to ISO 3137. Removal of volatile acids by evaporation and titration of the remaining acidity with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The evaporation is carried out on a boiling water bath in a fume cupboard.

Life cycle

NOW

WITHDRAWN
ISO 3138:1974
95.99 Withdrawal of Standard
May 27, 2002