+1 888 608-7511
Need help finding a standard?
Help Desk
Aluminium oxide primarily used for the production of aluminium -- Determination of fluorine content -- Alizarin complexone and lanthanum chloride spectrophotometric method
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.
Failed to load document history.
| Publish Date | Document Id | Type | View |
|---|