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Homepage>ISO 3431:1976-Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method
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sklademVydáno: 1976
ISO 3431:1976-Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method

ISO 3431:1976

ISO 3431:1976-Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method

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Označení normy:ISO 3431:1976
Počet stran:3
Vydání:1
Vydáno:1976
DESCRIPTION

ISO 3431:1976


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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