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

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

09-01-1976

Publisher

International Organization for Standardization

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.

DocumentType	Standard
Pages	5
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
BS 5050:1974	Similar to
NBN T 03 434 : 1983	Identical

ISO/TR 4277:2009	Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
PD ISO/TR 4277:2009	Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content