ISO 3431:1976
International Standard
Current Edition
·
Approved on
01 July 1976
Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method
ISO 3431:1976 Files
English
3 Pages
Current Edition
20.83 OMR
ISO 3431:1976 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.
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