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Cryolite, natural and artificial -- Determination of calcium content -- Flame atomic absorption method
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.
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