Reference number
ISO 2828:1973
ISO 2828:1973
© ISO 2024
International Standard
ISO 2828:1973
Aluminium oxide primarily used for the production of aluminium — Determination of fluorine content — Alizarin complexone and lanthanum chloride spectrophotometric method
Edition 1
1973-12
1973-12
ISO 2828:1973
7825
Published
(Edition 1, 1973)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
Applicable to products having F contents of more than 0.003 % (m/m). Dissolution of a test portion by attack by sulphuric acid under pressure. Separation of the fluorine by distillation at a temperature of (150 1) °C by sulphuric acid. The distillation is carried out by the method described in ISO 1693. Formation of a blue coloured complex between fluorine and alizarin complexone/lanthanum chloride reagent at a pH between 4.5 and 4.6. Addition of acetone to increase the stability and sensitivity of the fluorine complex. Spectrophotometric measurement of the complex at a wavelength of about 620 nm. Has also been approved by the IUPAC.
General information
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Status: PublishedPublication date: 1973-12Stage: International Standard confirmed [90.93]
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Edition: 1Number of pages: 3
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Technical Committee :ISO/TC 226ICS :71.100.10
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