Abstract
N- m-Tolyl- o-methoxybenzohydroxamic acid ( N- m-T- o-MBHA) was used for the simultaneous extraction and direct spectrophotometric determination of vanadium at microgram concentration from phosphorites. Vanadium (V) was extracted as a deep violet complex with 5 ml of 0.1 N- m-T- o-mMBHA in chloroform. The extraction was quantitative and obeys Beer's law in the range of 0.05–15 μg/ml of vanadium at 550 nm and the molar absorptivity was 6.4 × 10 3. This method is selective and vanadium could be determined in the presence of various ions.
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