Norm

ISO 1694:1976 en

Cryolite, natural and artificial - Determination of iron content - 1,10- Phenanthroline photometric method

31,57

Over deze norm

Status Definitief
Aantal pagina's 5
Gepubliceerd op 01-09-1976
Taal Engels
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.

Details

ICS-code 71.060.50
Nederlandse titel Cryolite, natural and artificial - Determination of iron content - 1,10- Phenanthroline photometric method
Engelse titel Cryolite, natural and artificial - Determination of iron content - 1,10- Phenanthroline photometric method

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