trace amounts determination of vanadium (v) using a new kinetic-catalytic reaction system

this study describes a new simple, sensitive and selective catalytic kinetic spectrophotometricmethod for the determination of vanadium (v). the method is based upon the catalytic effect ofvanadium (v) on the oxidation of carminic acid by bromate in sulfuric acid media. the reaction wasfollowed spectrophotometrically by measuring the decrease in absorbance at 490 nm and thedependence of sensitivity on the effective reaction variables was studied. under optimumexperimental conditions, the fixed time procedure was used to obtain a calibration curve over therange of 0.05–10.8 μg ml-1of vanadium (v). the calculated detection limit was 0.015 μg ml-1 fortwelve replicate measurement of blank signal. the relative standard deviations (n = 6) were 1.12,0.98% for 2.0, 8.0 μg ml-1 of vanadium (v), respectively. the effect of various species commonlyassociated with vanadium (v) in real samples was also investigated. the proposed method wassuccessfully applied for the determination of vanadium (v) in water and standard alloy samples.