Electrochemical Microsensors for the Detection of Cadmium(II) and Lead(II) Ions in Plants

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Authors

KRYŠTOFOVÁ Olga TRNKOVÁ Libuše ADAM Vojtěch ZEHNÁLEK Josef HUBÁLEK Jaromír BABULA Petr KIZEK René

Year of publication 2010
Type Article in Periodical
Magazine / Source Sensors
MU Faculty or unit

Faculty of Science

Citation
Field Electrochemistry
Keywords heavy metals; lead; cadmium; miniaturization; screen printed electrode; amperometry; voltammetry; plant; maize; sunflower; water
Description Routine determination of trace metals in complex media is still a difficult task for many analytical instruments. The aim of this work was to compare three electro-chemical instruments [a standard potentiostat (Autolab), a commercially available miniaturized potentiostat (PalmSens) and a homemade micropotentiostat] for easy to use and sensitive determination of cadmium(II) and lead(II) ions. The lowest detection limits (hundreds of pM) for both metals was achieved by using of the standard potentiostat, followed by the miniaturized potentiostat (tens of nM) and the homemade instrument (hundreds of nM). Nevertheless, all potentiostats were sensitive enough to evaluate contamination of the environment, because the environmental limits for both metals are higher than detection limits of the instruments. Further, we tested all used potentiostats and working electrodes on analysis of environmental samples (rainwater, flour and plant extract) with artificially added cadmium(II) and lead(II). Based on the similar results obtained for all potentiostats we choose a homemade instrument with a carbon tip working electrode for our subsequent environmental experiments, in which we analyzed maize and sunflower seedlings and rainwater obtained from various sites in the Czech Republic.
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