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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 Cu 2+  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 µmol L −1  with a detection limit of 0.19 µmol L −1  (R 2  = 0.9996). This study provides a new application for graphene-based sensors and a promising alternative for GLY analysis.

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