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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.
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