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ISO 2362:1972 PDF
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Aluminium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method
The principle of the method consists in fusion of a test portion with sodium carbonate. Separation of fluorine by distillation with sulphuric acid. Titration with thorium nitrate solution using 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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Edition | 1972 |
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Published Date | 1972 |
Published By | International Standardization Organisation |
Page Count | 5 |