Abstract
A differential pulse polarographic method is reported for the determination of trace amounts of vanadium, by its catalytic effect on the oxidation of Nile blue by bromate in acidic media. The oxidation product of Nile blue exhibits a polarographic wave at -0.17V vs. Ag/AgCl reference electrode. The reaction rate was monitored by measuring the differential pulse polarographic current of the reaction product. A detection limit of 5 ng/ml and calibration graph from 10–500 ng/ml Vanadium(V) (V(V)) were obtained. The influence of potential interfering substances on the determination of vanadium was studied. The method was applied to the determination of vanadium in wastewater and river water, providing good results. Prior separation of some interfering elements is not necessary. The characteristics of the method, i.e. simplicity, and highly selectivity made it especially suitable for routine analysis.
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