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Issue 2, 2009
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Combining chemical reduction with an electrochemical technique for the simultaneous detection of Cr(VI), Pb(II) and Cd(II)

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Abstract

This work herein reports the approach for the simultaneous determination of heavy metal ions including cadmium (Cd(II)), lead (Pb(II)), and chromium (Cr(VI)) using a bismuth film electrode (BFE) by anodic stripping voltammertry (ASV). The BFE used was plated in situ. Due to the reduction of Cr(VI) with H2O2 in the acid medium, on one hand, the Cr(III) was produced and Cr(VI) was indirectly detected by monitoring the content of Cr(III) using square-wave ASV. On the other hand, Pb(II) was also released from the complex between Pb(II) and Cr(VI). Furthermore, the coexistence of the Cd(II) was also simultaneously detected with Pb(II) and Cr(VI) in this system as a result of the formation of an alloy with Bi. The detection limits of this method were 1.39 ppb for Cd(II), 2.47 ppb for Pb(II) and 5.27 ppb for Cr(VI) with a preconcentration time of 120 s under optimal conditions (S/N = 3), respectively. Furthermore, the sensitivity of this method can be improved by controlling the deposition time or by using a cation-exchange polymer (such as Nafion) modified electrode.

Graphical abstract: Combining chemical reduction with an electrochemical technique for the simultaneous detection of Cr(vi), Pb(ii) and Cd(ii)

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Publication details

The article was received on 19 Mar 2008, accepted on 13 Aug 2008 and first published on 24 Oct 2008


Article type: Paper
DOI: 10.1039/B804670K
Citation: Analyst, 2009,134, 273-277
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    Combining chemical reduction with an electrochemical technique for the simultaneous detection of Cr(VI), Pb(II) and Cd(II)

    J. Li, J. Zhang, H. Wei and E. Wang, Analyst, 2009, 134, 273
    DOI: 10.1039/B804670K

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