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 |
|---|---|
| Published Date | 1972 |
| Published By | International Standardization Organisation |
| Page Count | 5 |
