On the Problem of Bromide Control in a TI3+ -perturbed Belousov-Zhabotinsky Oscillator

Abstract

AbstractIt is shown that TI3+ as a bromide removing perturbant of the BZ oscillators is superior to Ag+ in several aspects. A most important advantage is that the upper limit of the actual Br- concentration can be calculated from the potential of a bromide selective electrode in the presence of the corrosive TI3+ ions. Experimental Potentiometrie traces of a bromide selective electrode in a TI3+ perturbed BZ system show that the Br- concentration stays much below its critical concentration during the oscillations. These observations suggest that free Br- is not the critical intermediate formed during reduction of Ce4+ and responsible for the negative feedback associated with the oscillations.