Increasing urbanization and industrialization lead to the release of metals into the biosphere, which has become a serious issue for public health. In this paper, the direct electrochemical reduction of zinc ions is studied using electrochemically reduced graphene oxide (ERGO) modified glassy carbon electrode (GCE). The graphene oxide (GO) was fabricated using modified Hummers method and was electrochemically reduced on the surface of GCE by performing cyclic voltammograms from 0 to -1.5 V. The modification was optimized and properties of electrodes were determined using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The determination of Zn(II) was performed using differential pulse voltammetry technique, platinum wire as a counter electrode, and Ag/AgCl/3 M KCl reference electrode. Compared to the bare GCE the modified GCE/ERGO shows three times better electrocatalytic activity towards zinc ions, with an increase of reduction current along with a negative shift of reduction potential. Using GCE/ERGO detection limit 5 ng·mL-1 was obtained.

Central European Institute of Technology Brno University of Technology Technicka 3058 10 Brno CZ 616 00 Czech Republic

Department of Biomedical and Environmental Analysis Wroclaw Medical University Borowska 211 Wrocław PL 50 556 Poland

Department of Chemistry and Biochemistry Mendel University in Brno Zemedelska 1 Brno CZ 613 00 Czech Republic

Global Change Research Institute The Czech Academy of Sciences v v i Bělidla 4a Brno CZ 603 00 Czech Republic

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