Trace Amounts Determination of Vanadium (V) Using a New Kinetic-Catalytic Reaction System

Abstract

This study describes a new simple, sensitive and selective catalytic kinetic spectrophotometric<br />method for the determination of vanadium (V). The method is based upon the catalytic effect of<br />vanadium (V) on the oxidation of Carminic acid by bromate in sulfuric acid media. The reaction was<br />followed spectrophotometrically by measuring the decrease in absorbance at 490 nm and the<br />dependence of sensitivity on the effective reaction variables was studied. Under optimum<br />experimental conditions, the fixed time procedure was used to obtain a calibration curve over the<br />range of 0.05–10.8 μg mL-1of vanadium (V). The calculated detection limit was 0.015 μg mL-1 for<br />twelve replicate measurement of blank signal. The relative standard deviations (n = 6) were 1.12,<br />0.98% for 2.0, 8.0 μg mL-1 of vanadium (V), respectively. The effect of various species commonly<br />associated with vanadium (V) in real samples was also investigated. The proposed method was<br />successfully applied for the determination of vanadium (V) in water and standard alloy samples.