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Boron doped diamond and its utilization in electroanalysis of derivatives of aromatic compounds
Zavázalová, Jaroslava ; Schwarzová, Karolina (advisor) ; Šelešovská, Renáta (referee) ; Navrátil, Tomáš (referee)
This work is devoted to the study of boron doped diamond as electrode material, its properties and use in electroanalytical methods - in voltammetric and subsequently amperometric methods in combination with high performance liquid chromatography. The series of boron doped diamond films was tested with respect to the effect of boron concentration on their morphology, quality, electrochemical and spectral properties using scanning electron microscopy, atomic force microscopy, Raman spectroscopy, and cyclic voltammetry and differential pulse voltammetry. Further, the effect of boron concentration on the determination of selected substances was investigated, both for their oxidation (2-aminobiphenyl, benzophenone-3) and for their reduction (5-nitroquinoline). Furthermore, a voltammetric and amperometric method was developed for the determination of a mixture of aminobiphenyls and aminonaphthalenes using a boron doped diamond electrode. The effects of activation cleaning programs on the signal of benzophenone-3 were investigated using a boron doped diamond electrode, and the determination of benzophenone-3 on boron doped diamond electrode in the presence of the selected surfactant was studied. Boron doped diamond as carbon-based material was compared with other selected carbon materials such as glassy...
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The electrochemical detection of amino derivatives of naphthalene and biphenyl using platinum electrodes
Zavázalová, Jaroslava ; Schwarzová, Karolina (advisor) ; Navrátil, Tomáš (referee)
This thesis is focused on the electrochemical detection of genotoxic organic compounds, concretely 2-aminobiphenyl, 4-aminobiphenyl, 1-aminonaphthalene, and 2-aminonaphthalene using stationary platinum disk electrode. Stationary platinum disc electrode provides for batch voltammetric methods unconvincing results due to presumed passivation of the electrode surface. Microcylindric platinum electrode was used as working electrode for amperometric detector in HPLC. The method for the determination of tested analytes was optimized and limits of quantitation were determined: 1,4·10-6 mol dm-3 for 2-aminobiphenyl, 8,5·10-7 mol dm-3 for 4-aminobiphenyl, 3,8·10-7 mol dm-3 for 1-aminonaphthalene and 4,8·10-7 mol dm-3 for 2-aminonaphthalene. In comparison with the platinum tubular detector is the microcylindrical detector less sensitive. Further, a method for the determination of the studied compounds in urine was proposed using a preliminary separation and preconcentration of the studied analytes using solid phase extraction. The method was used for the analysis of real urine sample of a heavy smoker.
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