ISO 2362:1972
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Aluminium fluoride for industrial use Determination of fluorine content Modified Willard-Winter method
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
29-05-2019
English, French
01-12-1972
Important note : Users cannot be edited or removed once added to your Multi user PDF.
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.
| DocumentType |
Standard
|
| Pages |
5
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NBN T 03 435 : 1983 | Identical |
| BS 4993-1:1974 | Similar to |
| NFT 20 161 : 84 FD | Identical |
| BS 6445-1:1983 | Hexafluorosilicic acid for industrial use. Method for determination of available fluorine content (potentiometric method after distillation) |
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