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ISO 1693:1976
Cryolite, natural and artificial — Determination of fluorine content — Modified Willard-Winter method
Automatically translated name:
Cryolite, natural and artificial -- Determination of fluorine content -- Modified Willard-Winter method
STANDARD published on 1.9.1976
The information about the standard:
Designation standards: ISO 1693:1976
Publication date standards: 1.9.1976
SKU: NS-427363
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: International technical standard
Category: Technical standards ISO
The category - similar standards:
Annotation of standard text ISO 1693:1976 :
Description / Abstract: 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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