ISO 3431:1976
Current
The latest, up-to-date edition.
Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates content — Turbidimetric method
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English, French
01-07-1976
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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.
| DevelopmentNote |
Also numbered as BS 5072-7(1980). (07/2005)
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| DocumentType |
Standard
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| Pages |
3
|
| PublisherName |
International Organization for Standardization
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| Status |
Current
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| Standards | Relationship |
| NBN T 03 467 : 1983 | Identical |
| NFT 20 151 : 84 FD | Identical |
| ISO/TR 4277:2009 | Cryolite, natural and artificial Conventional test for evaluation of free fluorides content |
| PD ISO/TR 4277:2009 | Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content |
| BS 3484(1991) : 1991 AMD 8071 | SPECIFICATION FOR BLUE BLACK RECORD INKS |
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