Electrocatalytic Sulphite Detection at a Liquid-Liquid-Solid Three-Phase Boundary Electrode Sensors

Najoua Katif ,  Tony D. James ,  Ewan K. Galbraith ,  Frank Marken 

University of Bath, Department of Chemistry, Claverton Down, Bath BA2-7AY, United Kingdom

Abstract

Electrochemically driven ion transfer processes from aqueous to organic media are readily observed at electrodes modified with an immobilised water immiscible redox liquid [1]. The transfer of ions occurs at a potential determined by the aqueous concentration and aqueous hydration energy.

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In this study anion transfer processes are investigated at a 4-(3-phenylpropyl)pyridine | aqueous electrolyte interface and employing the ferrocenylmethyl-dodecyl-dimethylammonium bromide redox system. Facile and reversible anion transfer is observed and in the case of sulphite anions a two-phase electrocatalytic process leading to sulphate is observed. The new method combines anion selectivity and sensitivity due to catalytic currents.

[1] The electrochemical ion-transfer reactivity of porphyrinato metal complexes in 4- (3-phenylpropyl)pyridine vertical bar water systems. M.J. Bonné, C. Reynolds, S. Yates, G. Shul, J. Niedziolka, M. Opallo, F. Marken, New J. Chem. 30 (2006) 327.

 

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Presentation: Short communication at SMCBS'2007 International Workshop, by Najoua Katif
See On-line Journal of SMCBS'2007 International Workshop

Submitted: 2007-08-28 18:51
Revised:   2009-06-07 00:44