Active standard | Published: 01/07/1976

ISO 3431:1976

Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method
(Fluorure de sodium principalement utilisé pour la production de l´aluminium — Dosage des sulfates solubles — Méthode turbidimétrique)

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Detail information

Designation: ISO 3431:1976

Publication date: 01/07/1976

Pages: 3

Country: International technical standard

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Anotation

Description / Abstract: 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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