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Adsorption of As(III) and As(0) on the gold microelectrode |
Anna Basa 1, Tadeusz Krogulec 1, Andrzej S. Baranski 2 |
1. University of Białystok, Institute of Chemistry, Hurtowa 1, Białystok 15-399, Poland |
Abstract |
Strong toxicity and carcinogenesis of arsenic has been the reason to develop many analytical techniques for controlling and determining its content in environmental samples, mainly in natural and drinking water [1]. Considering simplicity, low-cost, velocity and sensitivity of electrochemical methods, they have found wide application to arsenic determination. That was possible due to the electrode processes of arsenic compounds and therefore better knowledge of their mechanism is significant. Most of the studies were conducted on the large size electrodes: mercury, platinum [2] or gold [3,4], not many works were carried out on the microelectrodes [1]. It seems that the mechanism of the electrode processes occurring on the gold electrodes has not been completely explained in the literature yet. Cyclic voltametry studies carried out on the gold microelectrode show, that As(III) ions adsorb on the electrode surface. This phenomenon was not considered by other researchers, concerning electrode processes taking place on the gold. Our studies indicate, that As (III) adsorbed on the electrode surface is involved in the following reaction: References:
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Presentation: Poster at SMCBS'2007 International Workshop, by Anna BasaSee On-line Journal of SMCBS'2007 International Workshop Submitted: 2007-08-31 13:35 Revised: 2009-06-07 00:44 |