ISO-3391 › Cryolite, natural and artificial -- Determination of calcium content -- Flame atomic absorption method

ISO-3391 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 3391:1976

Revision Level

1ST EDITION

Status

Current

Publication Date

Sept. 1, 1976

Committee Number

ISO TC 47/SC 7