Norm

ISO 1693:1976 en

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

31,57

Over deze norm

Status Definitief
Aantal pagina's 6
Gepubliceerd op 01-09-1976
Taal Engels
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.

Details

ICS-code 71.060.50
Nederlandse titel Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method
Engelse titel Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method

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