ISO-1693 Cryolite, natural and artificial -- Determination of fluorine content -- Modified Willard-Winter method

ISO-1693 - 1ST EDITION - CURRENT


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Specifies the determination for natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The principle consists in fusion of a test portion with sodium carbonate, separation of fluorine by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution in presence of sodium alizarinsulphonate/methylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate, the end-point being*spectrophotometrically determined at 525 nm.

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Document Number

ISO 1693:1976

Revision Level

1ST EDITION

Status

Current

Publication Date

Sept. 15, 1976

Committee Number

ISO TC 47/SC 7