ISO 1694:1976
Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
OVERVIEW
Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.
COMMENTS
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PRODUCT DETAILS
| Status | Current |
|---|---|
| Edition | 1976 |
| No. of Pages | 5 |
| ICS Classification | 71.060.50 Salts |
| Committee | ISO/TC 226 |
| Available for Purchase | For sale in Singapore only |
| Adoption | ISO |