Abstract
A novel sensitive and relatively selective kinetic method is presented for the determination of V(V), based on its catalytic effect on the oxidation reaction of Ponceau Xylydine by potassium bromate in presence of 5-sulfosalicylic acid (SSA) as activator. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of Ponceau Xylydine at 640 nm between 0.5 to 7 min (the fixed time method) in H3PO4 medium at 25oC. The effect of various parameters such as concentrations of H3PO4, SSA, bromate and Ponceau Xylydine, temperature and ionic strength on the rate of net reaction were studied. The method is free from most interferences, especially from large amounts of V(IV). The decrease in absorbance is proportional to the concentration of V(V) over the entire concentration range tested (1–15 ng mL−1) with a detection limit of 0.46 ng mL–1 (according to statistical 3Sblank/k criterion) and a coefficient of variation (CV) of 1.8% (for ten replicate measurement at 95% confidence level).
Highlights
Determination of vanadium is important, from a biological and industrial point of view
We describe a simple, rapid, precise, relatively selective and sensitive analytical method for the kinetic determination of V(V) at ppb levels using its catalytic effect on the oxidation of Ponceau Xyldine by BrO - ion in 3
In result of experimental studies made, it was observed that the best result or the highest sensitivity obtained in media containing H3PO4
Summary
Determination of vanadium is important, from a biological and industrial point of view. Among the most important kinetic methods, catalytic methods are very well known because of their simplicity, sensitivity, selectivity and low cost of instrumentation [13,14,15,16] These methods are based on vanadium catalytic properties concerning the oxidation of certain organic compounds. It was found that the determination of vanadium (IV), based on its catalytic effect on the reaction between Methyl Orange and bromate, was seriously affected by the presence of V(V) This method was successfully applied to the determination of V(IV) in water samples with good sensitivity. We describe a simple, rapid, precise, relatively selective and sensitive analytical method for the kinetic determination of V(V) at ppb levels using its catalytic effect on the oxidation of Ponceau Xyldine by BrO - ion in 3.
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