Cryolite (natural and artificial) -- Determination of aluminium content -- 8- Hydroxyquinoline gravimetric method
The method can be applied provided the Fe203 content does not exceed 0,15 . It can also be applied to products with molar ratio of NaF to AlF3 between approximately 3 and 1,7. The principle consists in dissolution of a test portion by acid fusion using potassium pyrosulphate and recovery by hydrochloric acid. Separation of the mixture by precipitation of aluminium, with ammonium benzoate , in an acetic reducing medium. Dissolution of the precipitate and reprecipitation as aluminium tri(quinolin-8-oxide) in an acetic buffer medium. Filtration, washing, drying of the precipitate at a temperature of 130 °C and weighing.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO 2367 |
| Publication Date | Dec. 15, 1972 |
| Language | en - English |
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| Supercedes | |
| Committee | ISO TC 47/SC 7 |
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