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Bismuth Modified Carbon-Based Electrodes for the Determination of Selected Neonicotinoid Insecticides
Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia
* Author to whom correspondence should be addressed.
Received: 4 April 2011; in revised form: 19 May 2011 / Accepted: 24 May 2011 / Published: 27 May 2011
Abstract: Two types of bismuth modified electrodes, a bismuth-film modified glassy carbon (BiF-GCE) and a bismuth bulk modified carbon paste, were applied for the determination of selected nitroguanidine neonicotinoid insecticides. The method based on an ex situ prepared BiF-GCE operated in the differential pulse voltammetric (DPV) mode was applied to determine clothianidin in the concentration range from 2.5 to 23 μg cm−3 with a relative standard deviation (RSD) not exceeding 1.5%. The tricresyl phosphate-based carbon paste electrodes (TCP-CPEs), bulk modified with 5 and 20 w/w% of bismuth, showed a different analytical performance in the determination of imidacloprid, regarding the peak shape, potential window, and noise level. The TCP-CPE with 5% Bi was advantageous, and the developed DPV method based on it allowed the determination in the concentration range from 1.7 to 60 μg cm−3 with an RSD of 2.4%. To get a deeper insight into the morphology of the bismuth-based sensor surfaces, scanning electron microscopic measurements were performed of both the surface film and the bulk modified electrodes.
Keywords: bismuth modified electrodes; voltammetry; neonicotinoids; clothianidin; imidacloprid
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Guzsvány, V.; Papp, Z.; Zbiljić, J.; Vajdle, O.; Rodić, M. Bismuth Modified Carbon-Based Electrodes for the Determination of Selected Neonicotinoid Insecticides. Molecules 2011, 16, 4451-4466.
Guzsvány V, Papp Z, Zbiljić J, Vajdle O, Rodić M. Bismuth Modified Carbon-Based Electrodes for the Determination of Selected Neonicotinoid Insecticides. Molecules. 2011; 16(6):4451-4466.
Guzsvány, Valéria; Papp, Zsigmond; Zbiljić, Jasmina; Vajdle, Olga; Rodić, Marko. 2011. "Bismuth Modified Carbon-Based Electrodes for the Determination of Selected Neonicotinoid Insecticides." Molecules 16, no. 6: 4451-4466.