engleski

Optimization of the membrane of the potentiometric sensor for thiabendazole determination

Thiabendazole (THIA) is systemic fungicide that has a broad spectrum of application.[1] Due to its possible residues on crops and harmful effects at higher levels, it should be determined and monitored in samples of fruits, vegetables, soil and water.[2] Ion-selective electrodes (ISEs), as simple and fast potentiometric sensors, could be a good alternative to commonly used methods for THIA determination such as high-performance liquid chromatography (HPLC), spectrofluorimetry and surface-enhanced Raman spectroscopy (SERS). The membrane, as a most important part of the ISE, responsible for its selectivity, can be optimized with the aim of developing sensor with better properties. The new sensor material for THIA determination was prepared using ionic pair of THIA cation and the 5-sulfosalicylate anion. The sensor material was incorporated in liquid type of ISE membrane. For optimization of the membrane of the potentiometric sensor for THIA determination, six different plasticizers and the content of the sensor material in the membrane (1%, 3% and 5%) were varied. The optimal plasticizer and sensor material content were chosen due to the best response characteristics measured using direct potentiometry.

thiabendazole, potentiometric sensor, direct potentiometry

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