Kinetic-Spectrophotometric Determination of Trace Amounts of Vanadium (V) Based on its Catalytic Effect on the Oxidation of Victoria Blue B by Potassium Bromate in Micellar Medium

Abstract: A new, simple, sensitive and selective catalytic spectrophotometric method was developed for the determination of trace amounts of V (V). The method is based on the catalytic effect of vanadium (V) on the oxidation of Victoria Blue B by potassium bromate at acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of Victoria Blue B at 632 nm with a fixed-time method. The decrease in the absorbance of Victoria Blue B is proportional to the concentration of V (V) in concentration range 1-250 ng/ml, with a fixed time of 0.5-2 min from initiation of the reaction. The limit of detection is 0.42 ng/ml V (V). The relative standard deviations of 50 and 100 ng/ml V (V) were 1.9 and 2.4%, respectively. The method was applied to the determination of vanadium (V) in natural water. Key words: Vanadium (V) Catalytic Victoria blue B Potasium bromate Micellar