Copper nanoparticles and reduced graphene oxide modified a glassy carbon electrode for the determination of glyphosate in water samples

Author(s)

Setznagl, Sarah ^[1] ; Cesarino, Ivana ^[2]

Affiliation

^[1] Sao Paulo State Univ UNESP, Inst Biosci, Botucatu, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Sch Agr, Botucatu, SP - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY; v. 102, n. 1, p. 293-305, JAN 2 2022.
• Web of Science Citations: 5

Abstract

A novel electrochemical sensor based on a glassy carbon electrode, modified with reduced graphene oxide and copper nanoparticles (GC/rGO-CuNPs), was developed for the determination of glyphosate herbicide (GLY) by differential pulse voltammetry (DPV). The proposed material was synthesised by a chemical method and characterised by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Voltammetric tests showed that the anodic peak at 30 mV, due to the Cu-0 to Cu2+ oxidation process, decreased linearly with small additions of GLY; this inhibition was used to quantify the pesticide content in water by DPV. The GC/rGO-CuNPs electrode was evaluated and optimised for the determination of GLY in tap water samples without any pretreatment, achieving a linear response in the range of 0.1 to 1.1 mu mol L-1 with a detection limit of 0.19 mu mol L-1 (R-2 = 0.9996). This study provides a new application for graphene-based sensors and a promising alternative for GLY analysis. (AU)

• FAPESP's process: 17/24274-3 - Development of glucose biosensor as an analytical tool aiming the optimization of second-generation ethanol production from pineapple residues
• Grantee: Ivana Cesarino
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants