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ISO 1694:1976
Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
Automatically translated name:
Cryolite, natural and artificial -- Determination of iron content -- 1,10- Phenanthroline photometric method
STANDARD published on 1.9.1976
The information about the standard:
Designation standards: ISO 1694:1976
Publication date standards: 1.9.1976
SKU: NS-427378
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: International technical standard
Category: Technical standards ISO
The category - similar standards:
Annotation of standard text ISO 1694:1976 :
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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