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Published on: February 16, 2018
A Potentiometric Sensor Based on a Molecularly Imprinted Polymer Modified with Multi-Walled Carbon Nanotubes for the
Mirela Samardžić1, Andrea Dandić1, Izabella Doris Panić1
1Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia.
Abstract:
Thiabendazole (TBZ) is a widely used post-harvest fungicide for fruit protection. Therefore, a new potentiometric sensor for TBZ determination based on a molecularly imprinted polymer (MIP) modified with multi-walled carbon nanotubes (MWCNTs) was developed. Different plasticizers, amounts of sensor material, and MWCNTs were tested during sensor optimization. The best sensor response was obtained for the membrane containing dibutyl phthalate (DBP) as a plasticizer, 3 wt% sensor material, and 2 wt% MWCNTs. The selected sensor showed a slope of 59.7 mV/decade of activity, a limit of detection (LOD) of 3.2·10-7 M, and a wide measuring range (6.2·10-7-1.0·10-3 M). The response time was 4 s, with a stable signal and a potential drift of 0.72 mV/h. The sensor was applied for TBZ determination in standard solutions and prepared fruit-peel extracts (orange, banana, and lemon).
