engleski

Development of the sensor for the potentiometric determination of thiabendazole

Thiabendazole (THIA) is an antifungal agent that is mostly used as a fungicide in fruits and vegetables. Since it is potentially toxic and harmful when obtained through food, it is important to develop new methods for THIA determination. The aim of this study was to develop potentiometric sensor for determination of THIA using an ionic pair of THIA cation and 5-sulfosalicylate anion. The methods that were used for sensor characterization and THIA determination were direct potentiometry and the Gran method. The sensor was ion-selective electrode with sensor material incorporated in liquid type of membrane. The membrane contained 1 % of sensor material and dibutyl sebacate was used as a plasticizer. The sensor showed a super-Nerstian slope, a wide measuring range and a low limit of detection. The response time of the sensor was only few seconds and it had a pH working range between 2 and 4. It had a good selectivity towards THIA. All these parameters led to fast and accurate determination of THIA in real samples (fruit peel).

thiabendazole, potentiometric sensor, ion-selective electrode, direct potentiometry, Gran method

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