Aktívna norma | Vydaná: 01.09.1976

ISO 1694:1976

Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
(Cryolithe, naturelle et artificielle — Dosage du fer — Méthode photométrique a la phénanthroline-1,10)

Dostupné jazyky: Anglicky, Francúzsky

Dostupné prevedenie: Elektronické PDF, Tlačené

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Podrobné informácie

Označenie: ISO 1694:1976

Dátum vydania: 01.09.1976

Stránok: 5

Krajina: Medzinárodná technická norma

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Anotácia

Description / 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.

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