This standard was last reviewed and confirmed in 2020.
Therefore this version remains current.
Abstract
PreviewApplies 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.
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Status: PublishedPublication date: 1976-09
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Edition: 1Number of pages: 5
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- ICS :
- 71.060.50 Salts
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| std 2 40 | Paper |
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