Codes & Standards - Purchase
ISO 2828:1973
Aluminium oxide primarily used for the production of aluminium -- Determination of fluorine content -- Alizarin complexone and lanthanum chloride spectrophotometric method
SKU: iso_007825_102471
Published by ISO
Publication Year 1973
1 Edition
3 pages
Product Details
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.
