Experimental studies on the complex oscillatory behaviour in gallic acid – BrO₃^{-  }Mn²⁺- H₂SO₄

Abstract

The title system has been studied in the batch reactor and its state followed by the bromide electrode potentials and UV spectroscopy. The system exhibits complex oscillatory behaviour including sequential oscillations. aperiodic oscillations and even the more complex oscillating states. On the basis of the analysis of the reaction products. the oscillations involving the following systems have been distinguished: (a) uncatalvzcd oscillations in gallic acid (GA)-BrO₃ –H₂SO₄, system. (b) Mn²⁺ -catalyzcd oscillations in gallic acid (GA)-BrO₃ –H₂SO₄ system. (c) Mn²⁺-catalyzed oscillations in monobromogallic acid(BrGA)-BrO₃ –H₂SO₄ system. The inhibition and combination between these oscillations result in the complex oscillatory pattern observedm the present system. The oscillating mechanism has been discussed on the basis of FKN mechanism and OKN mechanism.