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Sensors 2013, 13(11), 14417-14437; doi:10.3390/s131114417
Article

Behaviour of Zinc Complexes and Zinc Sulphide Nanoparticles Revealed by Using Screen Printed Electrodes and Spectrometry

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1 Department of Chemistry and Biochemistry, Faculty of Agronomy, Mendel University in Brno, Zemedelska 1, Brno CZ-613 00, Czech Republic 2 Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno CZ-616 00, Czech Republic 3 Department of Geology and Pedology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemedelska 1, Brno CZ-613 00, Czech Republic 4 Karel Englis College, Sujanovo Square 356/1, Brno CZ-602 00, Czech Republic
* Author to whom correspondence should be addressed.
Received: 1 August 2013 / Revised: 3 September 2013 / Accepted: 8 October 2013 / Published: 25 October 2013
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Abstract

In this study, we focused on microfluidic electrochemical analysis of zinc complexes (Zn(phen)(his)Cl2, Zn(his)Cl2) and ZnS quantum dots (QDs) using printed electrodes. This method was chosen due to the simple (easy to use) instrumentation and variable setting of flows. Reduction signals of zinc under the strictly defined and controlled conditions (pH, temperature, flow rate, accumulation time and applied potential) were studied. We showed that the increasing concentration of the complexes (Zn(phen)(his)Cl2, Zn(his)Cl2) led to a decrease in the electrochemical signal and a significant shift of the potential to more positive values. The most likely explanation of this result is that zinc is strongly bound in the complex and its distribution on the electrode is very limited. Changing the pH from 3.5 to 5.5 resulted in a significant intensification of the Zn(II) reduction signal. The complexes were also characterized by UV/VIS spectrophotometry, chromatography, and ESI-QTOF mass spectrometry.
Keywords: electrochemical analysis; differential pulse voltammetry; screen printed electrode; spectrometry; Zn(II) electrochemical analysis; differential pulse voltammetry; screen printed electrode; spectrometry; Zn(II)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nejdl, L.; Ruttkay-Nedecky, B.; Kudr, J.; Kremplova, M.; Cernei, N.; Prasek, J.; Konecna, M.; Hubalek, J.; Zitka, O.; Kynicky, J.; Kopel, P.; Kizek, R.; Adam, V. Behaviour of Zinc Complexes and Zinc Sulphide Nanoparticles Revealed by Using Screen Printed Electrodes and Spectrometry. Sensors 2013, 13, 14417-14437.

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