CATALYTIC DETERMINATION OF ULTRA-TRACE AMOUNTS OF VANADIUM WITH DETECTION BY LINEAR SWEEP VOLTAMMETRY

Vanadium has a very strong catalytic effect on the bromate oxidation o f gallocyanine at pH of 4.0. The oxidation product of gallocyanine exh ibit a voltammetric wave at +0.10 V vs. Ag/AgCl reference electrode in 0.10 mol/l KNO3 medium. The linear scan voltammetric behaviour of the reaction products at HMDE has been studied and selected as the indica tor component for the reaction. A detection limit of 0.05 ng/ml and ca libration graph from 0.30-200.00 ng/ml vanadium were obtained. Vanadiu m in water and gasoline samples was determined by this method, with sa tisfactory results.