Novel oscillatory reactions involving double substrate

Abstract

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.