Novel oscillatory reactions involving double substrate

摘要

The oscillatory features of a novel type B-Z type oscillator, fructose [F] + oxalic acid [OA] + Ce4+ + BrO3- + H2SO4 has been investigated. The induction time is found to be usually small or negligible. Both single frequency oscillations and two oscillatory states separated by a time-pause are observed. Oscillations occur between two critical limits of [F] and [OA]. A tentative mechanism has been suggested which involves both Br- ion control and free radical control. Computer simulation correctly predicts some of the oscillatory features such as (i) time of initiation, (ii) critical limits of [OA] and (iii) stoppage of oscillations by higher [Br-], confirming the primary role of Br- control mechanism. (C) 2003 Published by Elsevier Science B.V. [References: 17]