ISO 3431:1976

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.

SDO:

ISO

Language:

English

ICS Codes:

71.100.10

Status:

Published

Publish date:

1976-06-30

Standard Number:

ISO 3431:1976