Journal
TALANTA
Volume 72, Issue 5, Pages 1733-1737Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2007.04.055
Keywords
stannum film electrode; chromium(III); cadmium(ll); differential pulse anodic stripping voltammetry
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A stannum film electrode has been developed for the simultaneous determination of trace levels of chromium(III) and cadmium(II) by differential pulse anodic stripping voltammetry (DPASV). The stannum film electrode was generated in situ by depositing simultaneously the stannum film and the metals obtained by reduction of Cd(II) and Cr(III) at -1.4 V on a glassy carbon electrode. Then, the reduced products were oxidized by scanning the potential of the electrode from -1.4 to -0.4 V using DPASV. The electrode exhibited well-defined and separated stripping signals for both metals accompanied with a low background contribution. The possible mechanism of this design was proposed. Under the optimized working conditions, the detection limit was 2.0 and 1.1 mu g l(-1) for Cr(III) and Cd(II) at a deposition time of 3 min. Finally, the stannum film electrode was successfully applied to the determination of Cd(II) in tap water with satisfactory results. (C) 2007 Elsevier B.V. All rights reserved.
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