ISO 1694:1976

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

Publication date: Sep 1, 1976

General information

Current stage: 90.93 Effective date: Nov 3, 2020

Originator: ISO

Owner: ISO/TC 226

Type: International Standard

ICS: 71.060.50

Languages: French English

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Status: Published

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 1694:1976
90.93 Standard confirmed
Nov 3, 2020

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