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E x p l o r i n g t h e p o s s i b i l i t y o f u s i n g c a r b o n c o m p o s i t e e l e c t r o d e a s a d i s p o s a b l e s e n s o r f o r d e t e r m i n a t i o n o f p e s t i c i d e s
Bavol, Dmytro ; Dejmková, Hana (advisor) ; Fischer, Jan (referee)
In this master's thesis electrochemical determination of cymoxanil and famoxadone was performed on different types of electrodes. The work was focused on finding out optimal conditions for determination of these analytes in aqueous environments by differential pulse voltammetry (DPV) using a composite fiber rod electrode (CFRE), a glassy carbon electrode (GCE) and a capillary carbon paste electrode (CPE). Cymoxanil/famoxadone shows in aqueous environment BR buffer - methanol (9:1) single peak, whose position and height depends on the pH. As pH optimum for CFRE in the cathodic potential range for cymoxanil, pH 4 was chosen, the GCE was chosen pH 7 in the anodic area for famoxadone monitored by the GCE was chosen pH 4, pH 2 was chosen for the CPE. Under the optimal conditions, repeatability in oxidation and reduction area was verified. The optimum conditions of cymoxanil determination on CFRE and famoxadone determination on CPE were utilized for the measurement of the calibration curves. The second set of calibration curves was measured with addition of cymoxanil/famoxadone. Newly developed voltammetric methods were used for the determination of cymoxanil and famoxadone in samples of river water and soil.
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Utilization of potential programs in flow electrochemical determination of biologically active organic compounds
Bavol, Dmytro ; Dejmková, Hana (advisor) ; Josypčuk, Bohdan (referee) ; Metelka, Radovan (referee)
9 Abstract In this Ph.D. thesis possibilities of using our proposed potential programs for a multiple-pulse amperometry and a fast scan differential pulse voltammetry in combination with flow systems are presented. The development of new sensitive amperometric and voltammetric methods for the determination of oxidisable biologically active organic compounds is another aim of this work. In the first part of the work, the flow injection system and multiple-pulse amperometric detection were employed to develop and optimize a simple, low-cost, and rapid method for the simultaneous determination of natural and synthetic antioxidants. This technique involves the application of an appropriate potential waveform consisting of a suitable sequence of pulses on a single working electrode, thus allowing distinguish the analytes in a mixture with no need of separation. Conditions for the determination of antioxidants and modelling of the potential program were tested and studied, respectively. Second part of the work describes and characterizes the application of the fast scan differential pulse voltammetry (FSDPV) in combination with the flow systems. FSDPV is the electroanalytical technique that use high scan rate to record voltammograms within several milliseconds and ensures high temporal resolution. This technique...
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Utilization of potential programs in flow electrochemical determination of biologically active organic compounds
Bavol, Dmytro
9 Abstract In this Ph.D. thesis possibilities of using our proposed potential programs for a multiple-pulse amperometry and a fast scan differential pulse voltammetry in combination with flow systems are presented. The development of new sensitive amperometric and voltammetric methods for the determination of oxidisable biologically active organic compounds is another aim of this work. In the first part of the work, the flow injection system and multiple-pulse amperometric detection were employed to develop and optimize a simple, low-cost, and rapid method for the simultaneous determination of natural and synthetic antioxidants. This technique involves the application of an appropriate potential waveform consisting of a suitable sequence of pulses on a single working electrode, thus allowing distinguish the analytes in a mixture with no need of separation. Conditions for the determination of antioxidants and modelling of the potential program were tested and studied, respectively. Second part of the work describes and characterizes the application of the fast scan differential pulse voltammetry (FSDPV) in combination with the flow systems. FSDPV is the electroanalytical technique that use high scan rate to record voltammograms within several milliseconds and ensures high temporal resolution. This technique...
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Utilization of potential programs in flow electrochemical determination of biologically active organic compounds
Bavol, Dmytro
9 Abstract In this Ph.D. thesis possibilities of using our proposed potential programs for a multiple-pulse amperometry and a fast scan differential pulse voltammetry in combination with flow systems are presented. The development of new sensitive amperometric and voltammetric methods for the determination of oxidisable biologically active organic compounds is another aim of this work. In the first part of the work, the flow injection system and multiple-pulse amperometric detection were employed to develop and optimize a simple, low-cost, and rapid method for the simultaneous determination of natural and synthetic antioxidants. This technique involves the application of an appropriate potential waveform consisting of a suitable sequence of pulses on a single working electrode, thus allowing distinguish the analytes in a mixture with no need of separation. Conditions for the determination of antioxidants and modelling of the potential program were tested and studied, respectively. Second part of the work describes and characterizes the application of the fast scan differential pulse voltammetry (FSDPV) in combination with the flow systems. FSDPV is the electroanalytical technique that use high scan rate to record voltammograms within several milliseconds and ensures high temporal resolution. This technique...
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Utilization of potential programs in flow electrochemical determination of biologically active organic compounds
Bavol, Dmytro ; Dejmková, Hana (advisor) ; Josypčuk, Bohdan (referee) ; Metelka, Radovan (referee)
9 Abstract In this Ph.D. thesis possibilities of using our proposed potential programs for a multiple-pulse amperometry and a fast scan differential pulse voltammetry in combination with flow systems are presented. The development of new sensitive amperometric and voltammetric methods for the determination of oxidisable biologically active organic compounds is another aim of this work. In the first part of the work, the flow injection system and multiple-pulse amperometric detection were employed to develop and optimize a simple, low-cost, and rapid method for the simultaneous determination of natural and synthetic antioxidants. This technique involves the application of an appropriate potential waveform consisting of a suitable sequence of pulses on a single working electrode, thus allowing distinguish the analytes in a mixture with no need of separation. Conditions for the determination of antioxidants and modelling of the potential program were tested and studied, respectively. Second part of the work describes and characterizes the application of the fast scan differential pulse voltammetry (FSDPV) in combination with the flow systems. FSDPV is the electroanalytical technique that use high scan rate to record voltammograms within several milliseconds and ensures high temporal resolution. This technique...
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E x p l o r i n g t h e p o s s i b i l i t y o f u s i n g c a r b o n c o m p o s i t e e l e c t r o d e a s a d i s p o s a b l e s e n s o r f o r d e t e r m i n a t i o n o f p e s t i c i d e s
Bavol, Dmytro ; Dejmková, Hana (advisor) ; Fischer, Jan (referee)
In this master's thesis electrochemical determination of cymoxanil and famoxadone was performed on different types of electrodes. The work was focused on finding out optimal conditions for determination of these analytes in aqueous environments by differential pulse voltammetry (DPV) using a composite fiber rod electrode (CFRE), a glassy carbon electrode (GCE) and a capillary carbon paste electrode (CPE). Cymoxanil/famoxadone shows in aqueous environment BR buffer - methanol (9:1) single peak, whose position and height depends on the pH. As pH optimum for CFRE in the cathodic potential range for cymoxanil, pH 4 was chosen, the GCE was chosen pH 7 in the anodic area for famoxadone monitored by the GCE was chosen pH 4, pH 2 was chosen for the CPE. Under the optimal conditions, repeatability in oxidation and reduction area was verified. The optimum conditions of cymoxanil determination on CFRE and famoxadone determination on CPE were utilized for the measurement of the calibration curves. The second set of calibration curves was measured with addition of cymoxanil/famoxadone. Newly developed voltammetric methods were used for the determination of cymoxanil and famoxadone in samples of river water and soil.
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Investigation of electrochemical properties of carbon fiber rod electrode
Bavol, Dmytro ; Dejmková, Hana (advisor) ; Fischer, Jan (referee)
Properties of carbon fiber rod electrode (CFRE) were studied in this bachelor thesis. The potential window width in various basic electrolytes such as NaOH, KCl, and HClO4 was measured. Cyclic voltammetry (CV) was employed to investigate the course of the electrode reaction as well as the influence of the size and modification of the electrode surface on the results of the measurement of a model redox system ferrocyanide/ferricyanide. The CFRE applicability was verified by the determination of pesticide 2,6-dichloro-4-nitroaniline (dichloran) using DC voltammetry (DCV) and differential pulse voltammetry (DPV). In the presence of BR buffer- methanol (9:1), dichloran provides one or two redox waves, whose position and height depend on the pH. pH 10 was selected as optimum for all further measurements. Hence, the reproducibility dependency was found in this medium.
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