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Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

Ndlovu, Thabile and Mamba, Bhelde B and Sampath, Srinivasan and Krause, Rui W and Arotiba, Omotayo A (2014) Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode. In: ELECTROCHIMICA ACTA, 128 (SI). pp. 48-53.

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Official URL: http://dx.doi.org/10.1016/j.electacta.2013.08.084

Abstract

We present the application of a bismuth modified exfoliated graphite electrode in the detection of arsenic in water. Bismuth film was electrodeposited onto an exfoliated graphite (EG) electrode at a potential of -600 mV. The modification of EG resulted in an increase in the electroactive surface area of the electrode and consequently peak current enhancement in Ru(NH3)(6)(2+/13+) redox probe. Square wave anodic stripping voltammetry was performed with the modified electrode (EG-Bi) in As (III) solutions at the optimum conditions of pH 6, deposition potential of -600 mV and pre-concentration time of 180s. The EG-Bi was able to detect As (III) to the limit of 5 mu g L-1 and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords: Arsenic; Bismuth; Square wave anodic stripping voltammetry; Electrochemical sensor; Water
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 24 Jun 2014 06:39
Last Modified: 24 Jun 2014 06:39
URI: http://eprints.iisc.ac.in/id/eprint/49311

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