ISO 1693:1976

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

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ISO 1693:1976

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

PUBLISH DATE 1976
ISO 1693:1976

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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