▎ 摘　　要

This research focused on the development of an electrochemical sensor for the detection of paraoxon ethyl (POE) in agricultural wastewater using a bimetallic phosphosulfide Zn???Ni???P???S nanocompositereduced graphene oxide modified glassy carbon electrode (Zn???Ni???P???S/GO/GCE). The hydrothermal process was used to make the nanocomposite. SEM and XRD investigations revealed that the Zn???Ni??? P???S/GO nanocomposites were successfully prepared. The limit of detection and sensitivity were estimated to be 35 nM and 0.06369 ??A/??M, respectively, in electrochemical studies using DPV and amperometry analyses, and a wide linear range response to POE (1 to 200 ??M) was observed on the Zn???Ni???P???S/GO/GCE surface compared to other reported paraoxon sensors in the literature, which was associated with the incorporation of high conductive Zn???Ni bimetallic phosphosulf Bimetallic-based nanoparticles acted as a bridge between the GO and GCE surfaces, facilitating charge transfer. The proposed sensor was successfully applied to the determination of POE pesticide in agricultural wastewaters, with results indicating that the obtained recovery (90.00 to 98.00%) and RSD (2.32 to 4.37%) values by the standard addition method indicate that the proposed method for determining POE in agricultural wastewaters has good accuracy and precision.