ISO 3391:1976
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The latest, up-to-date edition.
Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method
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English, French
01-09-1976
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Describes the preparation of the calibration graph and the dissolution of a test portion in concentrated sulphuric acid and heating on a hot-plate until the hydrofluoric acid has evaporated. Treatment of the residue with concentrated hydrochloric acid. Aspiration of the solution into an acetylene/dinitrogen monoxide flame and spectrophotometric measurement of the absorption of the 422.7-nm line emitted by a calcium hollow cathode lamp.
| DevelopmentNote |
Also numbered as BS 5050-8(1980). (07/2005)
|
| DocumentType |
Standard
|
| Pages |
4
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| BS 5050:1974 | Similar to |
| NBN T 03 442 : 1983 | Identical |
| BS 4993-1:1974 | Similar to |
| 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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