1. Charles University, Faculty of Science, Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8, CZ- 128 43 Prague 2 Czech Republic
2. J. Heyrovský Institute of Physical Chemistry of the AS CR, v.v.i.; Dolejškova 2155/3 CZ-182 23 Prague 8 Czech Republic
3. University of Regensburg; Institute of Analytical Chemistry, Chemo- and Biosensors; Universitätsstraße 31 D-93053 Regensburg Germany