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Issue 19, 2016
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Electrochemical speciation analysis for simultaneous determination of Cr(III) and Cr(VI) using an activated glassy carbon electrode

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Abstract

In this study, the enhancement of electrochemical signals of Cr(III) and Cr(VI) by using an activated glassy carbon electrode (GCE) measured by differential pulse voltammetry (DPV) is demonstrated. The activated GCE exhibited higher sensitivity for detection of Cr(III) and Cr(VI) compared with the bare GCE. By using the activated GCE, the limit of detection decreased 15.3 times (from 0.230 to 0.015 μM) in the case of Cr(III) determination and 75 times (from 9.000 to 0.120 μM) in the case of Cr(VI) determination. Moreover, a simultaneous speciation analysis of Cr(III) and Cr(VI) using the activated GCE was presented. Scanning electron microscopy, elemental mapping, and electrochemical impedance spectroscopy were employed for investigation of the surface of the activated GCE. Finally, the influence of different ions (Na+, K+, NH4+, SO42−, NO3, and Cl in the form of Na2SO4, NaNO3, NH4Cl, and KCl salts) on the speciation signals of Cr(III) and Cr(VI) in a mixture of the two Cr oxidation states was investigated.

Graphical abstract: Electrochemical speciation analysis for simultaneous determination of Cr(iii) and Cr(vi) using an activated glassy carbon electrode

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Publication details

The article was received on 27 Apr 2016, accepted on 04 Jul 2016 and first published on 20 Jul 2016


Article type: Paper
DOI: 10.1039/C6AN00983B
Analyst, 2016,141, 5577-5585

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    Electrochemical speciation analysis for simultaneous determination of Cr(III) and Cr(VI) using an activated glassy carbon electrode

    L. Richtera, H. V. Nguyen, D. Hynek, J. Kudr and V. Adam, Analyst, 2016, 141, 5577
    DOI: 10.1039/C6AN00983B

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