Abstract
The method is based on the oxidation of Pyrogallol Red (PGR) by potassium bromate. Vanadium is determined by means of its catalytic effect on this oxidation, under the following conditions: pH 4, ionic strength 0.1 M, temperature 25 °C and at a wavelength of 490 nm. The decrease in absorbance of PGR (6 × 10–5M) in the presence of KBrO3(4.4 × 10–3M), at a fixed time, is proportional to the concentration of vanadium(V) over the range 0–50.94 p.p.b. The limit of detection of vanadium is found to be 0.61 p.p.b. The precision and accuracy of the method, using a fixed time of 5 min, is described. The selectivity of the method with respect to the possible interference of 23 species is also described. Starting from the oxidation of PGR (6 × 10–5M), at pH 4, and by means of the V(V)-KBrO3-PGR and V(V)-PGR systems it is possible to carry out the determination of vanadium(V) between 0.61 p.p.b. and 1.83 p.p.m., measuring the absorbance values at times of 5 and 10 min, with and without KBrO3.
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