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ISO 3431:1976

Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method

Publication date:   Jul 1, 1976

General information

90.93   Standard confirmed   Jun 13, 2022

ISO

ISO/TC 226 Materials for the production of primary aluminium

International Standard

71.100.10   Materials for aluminium production

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Scope

Applicable to products having SO4 contents of more than 0.05 % (m/m). Covers the dissolution of the test portion in hydrochloric acid and evaporation in hydrochloric acid solution for drying. Dissolution of the residue in a hydrochloric acid solution. Measurement of the turbidity obtained by precipitation, under specified conditions, of barium sulphate using a spectrophotometer at a wavelength of about 470 nm or a photoelectric absorptiometer.

Life cycle

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PUBLISHED
ISO 3431:1976
90.93 Standard confirmed
Jun 13, 2022