Collect. Czech. Chem. Commun. 1982, 47, 2454-2465

Study of the mechanism of the oscillating reaction between bromate and phenol

Antonín Tockstein and Marie Handlířová

Department of Physical Chemistry, Institute of Chemical Technology, 532 10 Pardubice


In the oscillating reaction of bromate with phenol in the medium of 0.4M-H2SO4, the length of the induction period is governed by a kinetic equation for a second-order reaction with a stoichiometry 1 : 1. The concentration of quinones in the reaction mixture increases also according to a kinetic equation for a second-order reaction. The influence of various compounds is discussed, whose additions shorten or prolong the induction period, bring about oscillations in a nonoscillating reaction mixture, or change the frequency of these oscillations. From the comparison of the time dependences of the potential of a platinum and an ion-selective electrodes and of the limiting current of the quinones, a reaction mechanism was proposed.