Reference number
ISO 3391:1976
© ISO 2025
International Standard
ISO 3391:1976
Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method
Edition 1
1976-09
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Published (Edition 1, 1976)
This publication was last reviewed and confirmed in 2020. Therefore this version remains current.

ISO 3391:1976

Language
Format
CHF 43
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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 1976-09
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 4
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.060.50 
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