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Simultaneous determination of cadmium (II), lead (II), copper (II) and mercury (II) by square-wave anodic stripping voltammetry at a montmorillonite-calcium modified carbon paste electrode

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A simple and efficient montmorillonite-calcium modified carbon paste electrode (MMT-Ca modified CPE) was constructed for simultaneous trace determination of Cd(II), Pb(II), Cu(II) and Hg(II). The MMT-Ca modified CPE significantly enhances the voltammetric stripping peak current magnitudes of the investigated metal ions compared to the bare CPE due to the large cation-exchange capacity and the strong adsorptive property of montmorillonite-Ca clay. A fully validated simple, sensitive, selective and precise square-wave anodic stripping voltammetric method was developed for the simultaneous trace determination of Cd(II), Pb(II), Cu(II) and Hg(II) in various water samples using a fabricated 10% (w/w) MMT-Ca modified CPE. The achieved limits of detection of Cd(II) 0.54 µg L-1, Pb(II) 0.30 µg L-1, Cu(II) 0.75 µg L-1 and Hg(II) 1.05 µg L-1 indicating the high sensitivity of the described SW-AS voltammetry method for the assay of these metal ions in aqueous solutions. The method was successfully applied for analysis of tap water, bottled natural water and seawater samples.
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Keywords: cadmium; copper; lead; mercury; modified carbon paste electrode; montmorillonite-Ca clay; simultaneous determination

Document Type: Research Article

Affiliations: 1: Faculty of Education, Chemistry & Physics Department, Kafr El-Sheikh University, Egypt 2: Faculty of Science, Chemistry Department, Analytical & Electrochemistry Research Unit, Tanta University, 31527 - Tanta, Egypt

Publication date: January 1, 2011

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