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Stripping voltammetric determination of mercury(II) and lead(II) using screen-printed electrodes modified with gold films, and metal ion preconcentration with thiol-modified magnetic particles

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Abstract

A novel approach to the electrochemical determination of heavy metals in tap water using anodic stripping voltammetry was developed using screen-printed electrodes modified with gold films. After optimisation of the experimental conditions, the screen-printed electrodes modified with gold films displayed excellent linear behaviour in the examined concentration range from 2 to 16 µg L-1 mercury and lead in 50 mM HCl with a detection limit of 1.5 µg L-1 and 0.5 µg L-1 for mercury and lead, respectively. In order to decrease the working range down to less than 1 µg L-1, a preconcentration step based on the use of magnetic particles modified with thiols was introduced into the protocol. Applying optimum binding conditions, the assay using screen-printed electrodes modified with gold films displayed excellent linear behaviour in the concentration range 0.1 to 0.8 µg L-1 in 50 mM HCl. The detection limit after a 120 s deposition time for mercury and lead were 0.08 µg L-1 and 0.02 µg L-1, respectively. The method has been applied to the determination of mercury and lead traces in tap water

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Authors and Affiliations

  1. Laboratory of Chemical Analysis and Biosensors, Faculty of Sciences and Techniques, University Hassan II, Mohammedia, 20 850-MA, Morocco

    Adil Mandil, Laila Idrissi & Aziz Amine

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  1. Adil Mandil
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  2. Laila Idrissi
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  3. Aziz Amine
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Correspondence to Aziz Amine.

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Mandil, A., Idrissi, L. & Amine, A. Stripping voltammetric determination of mercury(II) and lead(II) using screen-printed electrodes modified with gold films, and metal ion preconcentration with thiol-modified magnetic particles. Microchim Acta 170, 299–305 (2010). https://doi.org/10.1007/s00604-010-0329-x

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  • DOI: https://doi.org/10.1007/s00604-010-0329-x

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