STUDY ON THE HOMOGENEOUS INORGANIC BELOUS OV-ZHABOTINSKII (BZ) TYPE OSCILLATING REACTION IN CLOSED-SYSTEM

In a batch reactor, a complete homogeneous inorganic BZ type oscillato r has been designed for the first time based on the BrO3--H2PO2--Mn2+- Fe(phen)(3)(2+)-H2SO4 system. Oscillations in [Br-], [Mn3+] and [Fe(ph en)(3)(3+)] have been observed by monitoring either the potential chan ge on bromide ion selective electrode or the change in absorbance for Mn3+ at 480nm and Fe(phen)(3)(3+) at 630nm by UV spectroscopy. The osc illating reaction products have been analyzed and the total reaction h as been obtained. Effects of many factors including the concentrations of reactants, Cl-, Br-, Br-2, Ag+, CCl4 etc. have been investigated, based on which the controlling mechanism was discussed. The activation energy of the oscillation has been calculated by studying the effect of reaction temperature on the oscillating period(tp). The roles of tw o metallic ions in the oscillation have also been studied. According t o the experimental results, a novel method to design homogeneous BZ ty pe oscillators in the batch reactor has been developed, by which, not only the inorganic BZ type oscillators, but also a series of other che mical oscillators with amino acids, saccharides and even peptides as t he substrates could be designed. As those substrates are of biological functions and essential in the living system, the new type BZ oscilla tors would be useful to understand the periodic phenomena existed in t he biological process.