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ISO 3391:1976

Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method ISO 3391:1976

Publication date:   Sep 1, 1976

General information

90.93 Standard confirmed   Nov 3, 2020

ISO

ISO/TC 226 Materials for the production of primary aluminium

International Standard

71.060.50   Salts

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Published

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 3391:1976
90.93 Standard confirmed
Nov 3, 2020