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