Menu

0

ISO 3391:1976

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

Publication date:   Sep 1, 1976

General information

90.60   Close of review   Mar 5, 2026

ISO

ISO/TC 226 Materials for the production of primary aluminium

International Standard

71.060.50   Salts

Buying

  Published

PDF - €53.24

  French   English  



Buy

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
90.60 Close of review
Mar 5, 2026