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ISO 1694:1976

Current Revision

Cryolite, natural and artificial -- Determination of iron content -- 1,10- Phenanthroline photometric method

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 1694
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47/SC 7
Publish Date Document Id Type View
Not Available ISO 1694:1976 Revision