The method is applicable to products having vanadium contents between 0,0003 % (m/m) and 0,016 % (m/m), provided that the content of chromic oxide and titanic oxide does not exceed 0,002 % (m/m) and 0,006 % (m/m), respectively. The principle consists in a previous oxidation of the vanadium contained in the test sample to vanadium(V) by patassium permanganate in sulphuric acid solution. Formation of the vanadium-N-benzoyl-N-phenylhydroxylamine complex. Extraction of the violet coloured complex with chloroform in hydrochloric acid*solution. Photometric measurement of the coloured complex at a wavelength of about 524 nm.
Status : WithdrawnPublication date : 1976-09
Edition : 1Number of pages : 4
Technical Committee:Materials for the production of primary aluminium
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