engleski

A new, MWCNT based, solid-state thiabendazole-selective sensor

Direct potentiometric measurements using solid-state sensors have a great potential for thia-bendazole (TBZ) determination considering simplicity, accuracy, and low cost. Modifying the sensing material of the sensor with multi-walled carbon nanotubes (MWCNTs) leads to im-proved analytical properties of the sensor. In this study, a new potentiometric solid-state sensor for TBZ determination, based on MWCNTs modified with a sulfate group, and TBZ ion as sens-ing material was developed. The sensor exhibited a Nernstian response for TBZ (60.4 mV/decade of activity) in a working range between 8.6 ∙ 10-7 M and 1.0 ∙ 10-3 M. The detection limit for TBZ was 6.2 ∙ 10-7 M. The response time of the sensor for TBZ was 8 s, and its signal drift was only 1.7 mV/hour. The new sensor is applicable for direct potentiometric determination of TBZ in com-plex real samples, such as fruit peel. The accuracy of TBZ determination is confirmed using the standard addition method.

thiabendazole ; solid-state sensor ; direct potentiometry

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