Title : Electrochemical determination of thiamethoxam pesticide at silver particles-electrodeposited graphite electrode application in orange and tomato sampled
Neonicotinoids are a broad-spectrum insecticide predominantly used as seed dressings on major field crops and are additionally used as sprays in crop production, in managing household pests, and in deterring pests on domesticated animals. Neonicotinoids derive their toxicity from agonistically binding to nicotinic acetylcholine receptors (nAChRs) on the post-synaptic nerve membrane and fringing nerve impulses in a manner that is uncontrollable and uninterrupted. Neonicotinoids were frst developed in the 1990s, gained popularity from 2003-2011, and are now the most widely used pesticides in the world. Thiamethoxam is the representative second-generation neonicotinoid insecticides, which has been widely used for pest control in foliar, soil and seed treatments. It plays an active role in the control of numerous sucking and chewing insect pests. However, thiamethoxam has become a potential contaminant of the surface and underground waters which might seriously threat aquatic organisms and public health owing to its low soil adsorption, poor biodegradability, high leaching capability, and high solubility in water. In this context, we propose here a novel modified electrode for the electrochemical determination of thiamethoxam based on electrodeposition of silver particles on carbon paste electrode Ag@GrCE. The proposed electrode exhibits excellent electrocatalytic activity toward the thiamethoxam electro-reduction. Under the best experimental conditions, the reduction current intensity of thiamethoxam via square wave voltammetry presents a linear relationship with its concentration in the range from 5.0×10-5 to 1.0×10-3 mol L-1 with limit of detection around to 1.92×10-6 mol L-1. The selectivity properties of Ag@GrCE were tested with presence of various nitro aromatics compounds. Most importantly, the analytical utility of our electrode was examined with orange and tomato juices samples.
Audience take away:
• I propose during this presentation a sample analytical method.
• I propose the analysis of a pesticide by electrochemistry using a silver electrodeposited electrode.
• Evaluate our proposed method in reals samples of food.