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ISO 3431:1976
M00003569
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ISO 3431:1976 Sodium fluoride primarily used for the production of aluminium -- Determination of soluble sulphates content -- Turbidimetric method
standard by International Organization for Standardization, 07/01/1976
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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.