Voltammetric determination of the neonicotinoid insecticide thiamethoxam using a tricresyl phosphate-based carbon paste electrode

Abstract

The objective of the work was to i nvestigate the possibility of using a tricresyl phosphate-based carbon paste electrode for the direct voltammetric determination of the neonicotinoid insecticide thiamethoxam. The analyte was determined by differential pul se voltammetry in Britton-Robinson buffer p H 7.0 in the concentr ation range of 3.72-41.5 µg m L -1 . The reproducibility of t he analytical signal at the 7.29 µg mL -1 level was characterized by a relative standard devi ation of 1.3 %. The applicability of the d eveloped method was ev aluated by determining thiamethoxam in a river water sa mple and a co mmercial formulation Actara 25 WG.

Voltammetric Analysis of Pesticides

“…The widespread application of DPV is also due the peak-shaped of voltammograms which results in improved resolution between two species with similar redox potentials as peaks separated by 50 mV may be measured (Wang, 2006). Some recent applications of the technique for the fabrication of sensors include the use of carbon paste electrodes for the detection of either dinitrophenolic herbicides (Sreedhar et al, 2003) or neonicotinoid insecticides (Papp et al, 2010). Differential pulse voltammetric determination of herbicides at a clay-modified electrode has been also reported by Manisankar et al (2004a,b;.…”

“…More recently, Papp et al (2010) performed the voltammetric investigation of thiamethoxam (a neonicotinoid insecticide) using a tricresylphosphate-based CPE. The so-developed method allowed a direct determination of the insecticide in a river water samples.…”

Electroanalysis of Insecticides at Carbon Paste Electrodes with Particular Emphasis on Selected Neonicotinoid Derivatives

“…Regarding this specific group of insecticides, the individual methods proposed for their determination have employed the mercury-based working electrodes (Navalón et al, 1999;Guiberteau et al, 2001;Guzsvány, 2006;Guzsvány et al, 2006a with other refs. therein;Guziejewski et al, 2011a,b) or detection units incorporating various unmodified (Guzsvány et al, 2005;Guzsvány, 2006;Guzsvány et al, 2007a;Guzsvány et al, 2008a;Papp et al 2009a,b;Papp et al, 2010; and bismuth particles modified carbon based electrodes (Guzsvány, 2006;Guzsvány et al, 2006c;Gaál et al, 2007;Guzsvány et al, 2008a,b;Guzsvány et al, 2011a) as well as on copper(II) phthalocyanine modified carbon ceramic electrode (Majidi et al, 2011) or the nanosilver Nafion®/nanoTiO 2 Nafion® composite modified glassy carbon electrode (Kumaravel and Chandrasekaran, 2011).…”

Physiological effects of thiamethoxam on Zea mays and its electrochemical detection using a silver electrode

“…To meet this need, electrochemistry arises as an alternative that combines simplicity, speed, sensitivity, and specificity, using modified electrodes. [16][17][18][19][20] The use of these electrodes has registered considerable momentum during the last two decades undergoing a significant impulse notably in the field of electrocatalysis. 19,21,22 The global aim of the present work was to develop a procedure for the electrochemical determination of THM in Zea mays seedling following exposure under laboratory conditions, and to evaluate this insecticide's effect on plant seedling growth.…”