International Standard
ISO 1694:1976
Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
Reference number
ISO 1694:1976
ISO 1694:1976
Edition 1
1976-09
1976-09
© ISO 2024
International Standard
p
ISO 1694:1976
6310
Published
(Edition 1, 1976)
This standard was last reviewed and confirmed in 2020.
Therefore this version remains current.
Abstract
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.
General information
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Status: PublishedPublication date: 1976-09Stage: International Standard confirmed [90.93]
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Edition: 1Number of pages: 5
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Technical Committee :ISO/TC 226ICS :71.060.50
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