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ISO 3391:1976

Current
Current

The latest, up-to-date edition.

Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

01-09-1976

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.

DevelopmentNote
Also numbered as BS 5050-8(1980). (07/2005)
DocumentType
Standard
Pages
4
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
BS 5050:1974 Similar to
NBN T 03 442 : 1983 Identical
BS 4993-1:1974 Similar to

ISO/TR 4277:2009 Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
PD ISO/TR 4277:2009 Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content

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