International Standard
ISO 3391:1976
Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method
Reference number
ISO 3391:1976
ISO 3391:1976
Edition 1
1976-09
1976-09
© ISO 2024
International Standard
p
ISO 3391:1976
8690
Published
(Edition 1, 1976)
This standard was last reviewed and confirmed in 2020.
Therefore this version remains current.
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
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Status: PublishedPublication date: 1976-09Stage: International Standard confirmed [90.93]
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Edition: 1Number of pages: 4
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Technical Committee :ISO/TC 226ICS :71.060.50
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