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Cathodic reduction of bisulfite and sulfur dioxide in aqueous solutions on copper electrodes: An electrochemical ESR study

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Streeter, I, Wain, AJ, Davis, J and Compton, RG (2005) Cathodic reduction of bisulfite and sulfur dioxide in aqueous solutions on copper electrodes: An electrochemical ESR study. JOURNAL OF PHYSICAL CHEMISTRY B, 109 (39). pp. 18500-18506. [Journal article]

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DOI: 10.1021/jp058119n

Abstract

The electrochemical reduction of aqueous solutions of sulfite under acidic conditions on copper electrodes is reported, and a mechanism is proposed. Cyclic voltarnmetry at a copper disk suggests the operation of two reduction processes, the dominant process depending on solution pH. At very low pH (0-2), sulfur dioxide is reduced in a two-electron, two-proton reaction, but at higher pH (2-5), bisulfite is the electroactive species, being reduced by a single electron to ultimately yield the SO2.- radical anion. Simultaneous electrochemical electron spin resonance (ESR) measurements using a tubular flow cell support this proposal, and suggest that the radical anion is in equilibrium with dithionite, which is found to decay at low pH. Digisim. modeling of the system is shown to be consistent with this mechimism over the experimental pH range.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:14337
Deposited By:Professor James Davis
Deposited On:01 Jul 2010 09:28
Last Modified:18 Aug 2011 11:19

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