Effect of iron(II), cerium(IV) and manganese(lll) in the reaction between thallium(III) and hydrogen peroxide in aqueous perchloric acid

Abstract

The otherwise slow reaction between TI(III) and H₂O₂ goes to completion in a few seconds in the presence of 10^-6 mol dm^-3 Fe(II). The reaction involves a cycle of steps with reactive intermediates such as Tl(II) and HO₂ [Fe(III)] >.1 x 10^-4 mol dm^-3 is very effective and [Fe(III)] < 1 x 10^-5 mol dm^-3 has no effect at all on the reaction. Cerium(IV) and Mn(III) induce TI(III) - H₂O₂ reaction and the extent of reduction of TI(III) depends on the absolute and relative concentrations of the reactants. Ag(II) and Cr(III) are without any effect, but vanadium(IV) induces the reaction.