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Voltammetric Determination of the Herbicide Linuron Using a Tricresyl Phosphate-Based Carbon Paste Electrode
Laboratory of Physics, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia
Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia
Department of Analytical Chemistry, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic
Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, P.O. Box 224, 18000 Niš, Serbia
* Author to whom correspondence should be addressed.
Received: 1 November 2011; in revised form: 5 December 2011 / Accepted: 5 December 2011 / Published: 22 December 2011
Abstract: This paper summarises the results of voltammetric studies on the herbicide 3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea (Linuron), using a carbon paste electrode containing tricresyl phosphate (TCP-CPE) as liquid binder. The principal experimental conditions, such as the pH effect, investigated in Britton-Robinson buffer solutions (pH 2.0–7.0), the peak characteristics for the analyte of interest, or instrumental parameters for the differential pulse voltammetric mode were optimized for the method. As found out, the best electroanalytical performance of the TCP-CPE was achieved at pH 2.0, whereby the oxidation peak of Linuron appeared at ca. +1.3 V vs. SCE. The analytical procedure developed offers good linearity in the concentration range of 1.25–44.20 μg mL−1 (1.77 × 10−4–5.05 × 10−6 mol L−1), showing - for the first time - the applicability of the TCP-CPE for anodic oxidations in direct voltammetry (without accumulation). The method was then verified by determining Linuron in a spiked river water sample and a commercial formulation and the results obtained agreed well with those obtained by the reference HPLC/UV determination.
Keywords: Linuron; herbicide; carbon paste electrode; tricresyl phosphate; differential pulse voltammetry
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Ðorđević, J.; Papp, Z.; Guzsvány, V.; Švancara, I.; Trtić-Petrović, T.; Purenović, M.; Vytřas, K. Voltammetric Determination of the Herbicide Linuron Using a Tricresyl Phosphate-Based Carbon Paste Electrode. Sensors 2012, 12, 148-161.
Ðorđević J, Papp Z, Guzsvány V, Švancara I, Trtić-Petrović T, Purenović M, Vytřas K. Voltammetric Determination of the Herbicide Linuron Using a Tricresyl Phosphate-Based Carbon Paste Electrode. Sensors. 2012; 12(1):148-161.
Ðorđević, Jelena; Papp, Zsigmond; Guzsvány, Valéria; Švancara, Ivan; Trtić-Petrović, Tatjana; Purenović, Milovan; Vytřas, Karel. 2012. "Voltammetric Determination of the Herbicide Linuron Using a Tricresyl Phosphate-Based Carbon Paste Electrode." Sensors 12, no. 1: 148-161.