Indirect Speciation Analysis of Thallium in Plant Extracts by Anodic Stripping Voltammetry

Authors

  • Joanna Pałdyna,

    1. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland tel(fax): +48 22 822 02 11 ext. 502
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  • Beata Krasnodębska-Ostręga,

    Corresponding author
    1. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland tel(fax): +48 22 822 02 11 ext. 502
    • Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland tel(fax): +48 22 822 02 11 ext. 502
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  • Monika Sadowska,

    1. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland tel(fax): +48 22 822 02 11 ext. 502
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  • Justyna Gołębiewska

    1. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland tel(fax): +48 22 822 02 11 ext. 502
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Abstract

A sensitive voltammetric method (DPASV) was developed for the determination of Tl(I) and Tl(III) in plant extracts. To limit the influence of the organic matrix on the measurements, UV irradiation and addition of Amberlite XAD-7 resin was studied. The application of 0.5 g of the resin allowed defining thallium speciation in 10.0 mL of a solution containing 0.20 mL of Sinapis alba extract. The quantification limit of 0.5 ng mL−1 Tl(I) was found for only 10 min of preconcentration, and is low enough to allow dilution of the sample before thallium determination. The procedure was validated using the recovery study and intermethod comparison with HPLC ICP MS.

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