▎ 摘　　要

This study was performed on the synthesis of ZnS, Ni2P and reduced graphene oxide (ZnS@Ni2P/rGO) nanocomposite as an electrochemical sensor of chlorpyrifos (CPS) in farmland recirculated waters. The electrodeposition method was used to modify a glassy carbon electrode (GCE) surface with rGO, ZnS and Ni2P nanoparticles. Morphological and structural analyses using SEM and XRD showed that defects in rippled nanosheets of rGO on GCE provided the substrate for high porous and high crystalline electrodeposition of ZnS@Ni2P nanoparticles which led to a higher effective surface area and could effectively promote the electron transfer of the electrode. Results of electrochemical studies using DPV and amperomerty indicated sensitive, selective and stable responses of ZnS@Ni2P/rGO/GCE to the presence of CPS. Results indicated a wide linear response range from 25 to 375 mu M with a high sensitivity of 0.89799 mu A/mu M and a limit of detection of 0.004 mu M. Comparison of the obtained sensing properties with the previously reported sensors illustrated the comparable electrochemical performance of ZnS@Ni2P/rGO/GCE, which was correlated to the high electron transfer rate contributed by the edge-rich architecture of the rGO and catalysis sites of ZnS and Ni2P nanoparticles. The modified CPS sensor demonstrated good accuracy in prepared real samples of agricultural recirculated water, with appropriate recovery (>= 92.50%) and RSD (