Stripping voltammetric analysis of organophosphate pesticide based on graphene-zirconia nanocomposite modified electrode

• 1、Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry,Central China Normal University

Abstract：This paper describes the preparation, characterization, and electrochemical properties of graphene and zirconia nanoparticles nanocomposite. Because of the strong affinity of zirconia (ZrO2) to the phosphoric group, nitroaromatic organophosphate (OP) pesticides strongly bind to the electrode surface, and graphene can be used as electrode materials with useful property for electrochemical applications. Graphene and zirconia nanoparticles (GZN) were one-step electrodynamically deposited onto the glass carbon electrode (GCE) by cyclic voltammetry. The electrochemical characterization and anodic stripping voltammetric performance of bound OPs were evaluated using cyclic voltammetric and square-wave voltammetric (SWV) analysis. A combination of solid-phase extraction (SPE) with SWV analysis resulted in a fast, sensitive, and selective electrochemical method for determination of OPs using methyl parathion (MP) as a representative. The stripping response was highly linear over the MP range of 0.05-2.0μg/mL, with a detection limit of 0.005μg/mL. The proposed sensor showed good precision and reproducibility, these findings can lead to a widespread use of electrochemical sensors to detect OPs contaminates.

Keywords： Organophosphate pesticides Graphene Zirconia