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Voltammetric determination of sulfathiazole on boron doped diamond electrode
Zich, Mikuláš ; Fischer, Jan (advisor) ; Schwarzová, Karolina (referee)
This bachelor thesis is dedicated to study of the electrochemically active substance sulfathiazole. Sulfathiazole is an antibacterial agent added to animal feed. As a result, it contaminates soil, water bodies and food. A boron-doped diamond electrode was chosen as the working electrode for voltammetric determination. First, the optimal pH for the study of sulfathiazole in the range of 2 to 12 by the technique differential pulse voltammetry was determined and the optimal pretreatment of the electrode before measurements. Subsequently, the calibration dependence was measured. Sulfathiazole was successfully dissolved in water at a concentration of c = 1·10-3 mol l-1 and Britton-Robinson buffer was used as the electrolyte. As the optimal pH was determined pH 6,0. At this pH, a relative standard deviation of sr = 5% was achieved. Standart deviation of 5 % has been achieved when the working electrode was polished before each measurement. Under these conditions, was calibration dependence measured in concentration range from 0,1 to 100 μmol l-1 . Linear dynamic range was calculated between 0,1 - 20 μmol l-1 . Limit of quantitation was found to be 97 nmol l-1 .
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