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Issue 28, 2007
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pH oscillations and bistability in the methylene glycol–sulfite–gluconolactone reaction

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Abstract

The Methylene glycolSulfiteGluconolactone (MGSG) reaction is the first example of an organic-based pH oscillator. This reaction is of particular interest as it displays large amplitude oscillations in hydroxide ion accompanied by small amplitude (10–3 V) oscillations in potential, indicating that it is not driven by redox processes. We investigate the reaction in a batch (closed) and flow (open) reactor and examine the role of the aging of the gluconolactone stock solution. The system is found to display oscillations and bistability for a wide range of flow rates and initial compositions. The experimental results are reproduced in numerical simulations in an extended model of the reaction in which the decay of the stock solution is incorporated. Finally, we analyse the features of the reaction that make it a suitable basis for the development of novel pH oscillators.

Graphical abstract: pH oscillations and bistability in the methylene glycol–sulfite–gluconolactone reaction

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Publication details

The article was received on 23 Mar 2007, accepted on 30 Apr 2007 and first published on 22 May 2007


Article type: Paper
DOI: 10.1039/B704407K
Phys. Chem. Chem. Phys., 2007,9, 3711-3716

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    pH oscillations and bistability in the methylene glycolsulfitegluconolactone reaction

    K. Kovacs, R. E. McIlwaine, S. K. Scott and A. F. Taylor, Phys. Chem. Chem. Phys., 2007, 9, 3711
    DOI: 10.1039/B704407K

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