Reference number
ISO 3431:1976
© ISO 2025
International Standard
ISO 3431:1976
Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method
Edition 1
1976-07
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Published (Edition 1, 1976)
This publication was last reviewed and confirmed in 2022. Therefore this version remains current.

ISO 3431:1976

Language
Format
CHF 43
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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.

General information

  • Status
     : Published
    Publication date
     : 1976-07
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 3
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.100.10 
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