THIORIDAZINE HYDROCHLORIDE AS A NEW, SENSITIVE REAGENT FOR DETERMINATION OF VANADIUM AT PPB LEVEL

Thioridazine hydrochloride is proposed as a new, sensitive reagent for determination of trace amounts of vanadium. Oxidation of thioridazine hydrochloride by hydrogen peroxide is a slow process and in presence of vanadium increased considerably. The reaction is followed spectroph otometrically by measuring the change in absorbance at 635 nm. Using t wo kinetic methods (tangent method and maximum absorbance method) vana dium (IV) can be determined in the range 50-450 and 2.5-200 ppb respec tively. The effects of foreign ions were investigated. Most of the inv estigated ions had no effects on the determinations but some ions such as Fe2+, Fe3+, Mn2+, Cu2+, SCN-, I- and ascorbic acid caused serious interference.