, Volume 381, Issue 4, pp 979-985
Date: 17 Dec 2004

A comparison of different types of gold–carbon composite electrode for detection of arsenic(III)

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Abstract

A study has been conducted using abrasively modified basal and edge-plane graphite, carbon-paste, and carbon–epoxy electrodes to create gold–carbon composite electrodes. Using either nano or micro-sized gold particles their suitability for use in detecting arsenic(III) is assessed. It was found that gold arrays prepared from micron-sized particles gave the best performance for arsenic detection. In particular micron arrays produced in carbon-paste electrodes with an easily renewable surface work well for detection of arsenic, producing a detection limit of 5(±2)×10−9 mol L−1, with a high sensitivity of 10(±0.1) A mol−1 L.