ISO/TC 47 Chemie,
ISO/TC 47 Chemistry,
ISO/TC 47 Chimie,
ISO Internationale Organisation für Normung,
ISO International Organization for Standardization,
ISO Organisation Internationale de Normalisation
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Medientyp:
Norm
Titel:
ISO 1694
:
Cryolite, natural and artificial; Determination of iron content; 1,10- Phenanthroline photometric method
Weitere Titel:
Früher unter dem Titel: ISO/R 1694 (1970-08)
Kryolith (natürlich oder künstlich); Bestimmung des Eisengehaltes; Photometermethode mit 1,10-Phenanthrolin
Cryolithe, naturelle et artificielle; Dosage du fer; Méthode photométrique à la phénanthroline-1,10
Beschreibung:
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.