Benzotriazole is a representative of mobile and persistent compounds that remain in the environment for a long time due to continuous intake and poor biodegradability. Benzotriazole is widely used as a UV stabilizer for plastic materials and as a corrosion inhibitor for various metals, which is why it is found in food packaging, plastics, textiles, dishwashing detergents, brake and coolant fluids, and antifreeze. Currently, there is no legislation in EU for banning its use, but it is included in the list of emerging contaminants, as it is a potential carcinogen and disruptor of the hormonal system upon chronic exposure. Classical chromatographic and spectrophotometric techniques can be used for determination, and as an alternative to long-lasting and demanding analyses, electrochemical techniques can be used, specifically voltammetry, since benzotriazole is an electroactive compound and is reduced in an acidic environment. To determine properties and for quantitative determination cyclic voltammetry and square wave voltammetry were used in the thesis. Instead of a classic electrochemical cell, screen-printed electrodes were used, which are a miniaturized three-electrode system, with a carbon working electrode, a silver quasi-reference electrode, and a platinum counter electrode. To achieve a detection limit of 2,4 µM or 300 ppb, a modification of the carbon working electrode with single-walled carbon nanotubes with the addition of Nafion was made.
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