Abstract
A new catalytic method for the determination of 0–0.6 ppm of vanadium is described. The method is based on the catalytic action of vanadium on the reaction of bromate with bromide at pH = 1.80 ± 0.05. In this hitherto unreported reaction no bromine is formed, but in a two-step process hypobromite is produced. The rate is monitored by potentiometry, and results are evaluated from the recorded potential vs time curves. The optimal conditions for the determination have been investigated, and interferences as well as their elimination studied. The stoichiometry, mechanism, and kinetics of both the uncatalyzed and the catalyzed reactions were investigated, and the rate constants (for 20 °C) and the entropies and enthalpies of activation of both the uncatalyzed and the catalyzed reactions were determined.
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