Reference number
ISO 1694:1976
ISO 1694:1976
© ISO 2024
International Standard
ISO 1694:1976
Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
Edition 1
1976-09
1976-09
ISO 1694:1976
6310
Publicado
(Edición 1, 1976)
Esta publicación se revisó y confirmó por última vez en 2020.
Por lo tanto, esta versión es la actual.
Resumen
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.
Informaciones generales
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Estado: PublicadoFecha de publicación: 1976-09Etapa: Norma Internacional confirmada [90.93]
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Edición: 1Número de páginas: 5
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Comité Técnico :ISO/TC 226ICS :71.060.50
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