Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

Thabile Ndlovu, Bhekie B. Mamba, Srinivasan Sampath, Rui W. Krause, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

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)62+/3+ 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 180 s. The EG-Bi was able to detect As (III) to the limit of 5 μg L-1and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare.

Original languageEnglish
Pages (from-to)48-53
Number of pages6
JournalElectrochimica Acta
Volume128
DOIs
Publication statusPublished - 10 May 2014

Keywords

  • Arsenic
  • Bismuth
  • Electrochemical sensor
  • Square wave anodic stripping voltammetry
  • Water

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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