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Issue 4, 2011
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A study of the separation, enrichment and determination of trace amounts of Hg2+ synchronously

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Abstract

A novel, simple and highly reliable method for the determination of trace amounts of mercury on a glassy carbon electrode (GCE) modified with a compound of crystal violet and multi-walled carbon nanotubes (CV+I/MWCNTs) is reported. The principle of organic co-precipitation in solution was applied to the application of electrochemical analysis. First, the CV+/MWNTs modified electrode was immersed in solution with I, CV+ and I to form an ion association complex (CV+I) as the carrier by the following reaction. Hg2+ was added into solution, where it reacted with I to form HgI42, then in the presence of CV+ an organic coprecipitator formed HgI42−·2CV+ by electrostatic adsorption. Finally, the HgI42−·2CV+ was adsorbed by the carrier CV+I onto the surface of the modified electrode by the principle of organic co-precipitation. Meanwhile, trace mercury could be detected on the CV+I and MWCNTs modified electrode (CV+I/MWCNTs/GCE) by an electrochemical method. Therefore, preconcentration, separation and electrochemical detection of trace mercury were simultaneously and synchronously carried out. After optimization of the method, a linear response was obtained in the concentration range from 5.0 × 10−9 – 1.9 × 10−6 M, with a detection limit of 1.0 × 10−10 M. The modified electrode shows high selectivity, sensitivity and stability. This modified GCE does not present any significant interference from Cd2+, Cu2+, Ag+, Fe3+, Pb2+, Cr3+, Zn2+. No deterioration was observed in the electrode response during at least 3 weeks of successive measurements. The proposed method enables the separation, enrichment and electrochemical detection of trace mercury in aqueous solutions.

Graphical abstract: A study of the separation, enrichment and determination of trace amounts of Hg2+ synchronously

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Publication details

The article was received on 09 Nov 2010, accepted on 14 Feb 2011 and first published on 28 Feb 2011


Article type: Paper
DOI: 10.1039/C0AY00682C
Anal. Methods, 2011,3, 865-871

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    A study of the separation, enrichment and determination of trace amounts of Hg2+ synchronously

    B. Fang, M. Liu, G. Wang, C. Zhang and Y. Feng, Anal. Methods, 2011, 3, 865
    DOI: 10.1039/C0AY00682C

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