ISO 1693:1976
Current
The latest, up-to-date edition.
Cryolite, natural and artificial — Determination of fluorine content — Modified Willard-Winter method
Hardcopy , PDF
English, French
01-09-1976
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.
| Committee |
ISO/TC 226
|
| DocumentType |
Standard
|
| Pages |
6
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| BS 5050:1974 | Similar to |
| NBN T 03 433 : 1983 | Identical |
| ISO/TR 4277:2009 | Cryolite, natural and artificial — Conventional test for evaluation of free fluorides content |
| PD ISO/TR 4277:2009 | Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content |
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