Determination of Vanadium in Rocks, Minerals, Ores, etc. with Benzohydroxamic Acid

Central Chemical Laboratory, Geological Survey of India, Calcutta-13 Manuscript received 4 February 1972; revised 13 December 1972; accepted 26 December 1972 A rapid, accurate and precise method for the colorimetric estimation of vanadium in geolo­gical materials based on the colour reaction of vanadate with benzohydroxamic acid in aqueous. ethanol medium at pH 2.5 have been described. A procedure based on the extraction of the coloured complex by methyl isobutyl ketone at pH 2.0 which permits the spectrophotometric determination of vanadium present in various types of rocks, minerals and ores in ppm level have also been described