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download between 0-24 hoursReleased: 1976
ISO 3391:1976
ISO 3391:1976-Cryolite, natural and artificial-Determination of calcium content
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Standard´s number: | ISO 3391:1976 |
Pages: | 4 |
Edition: | 1 |
Released: | 1976 |
DESCRIPTION
ISO 3391:1976
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.