▎ 摘　　要

Sulfite (SO2- 3 ) is mostly used as a preservative in food products, and excessive human intake can lead to cardiac and cerebral discomfort and other adverse effects. Considering the high cost of existing SO2-3 detection methods and the complexity of sample handling, this study is based on laser-induced graphene technology and the simultaneous preparation of multisite copper oxide (CuO) nanoparticles and their attachment to the graphene surface, which can help to fully contact with SO2-3 , so as to develop a highly sensitive and consistent screen -printed electrode as an electrochemical sensor (CuO/rGO/SPE). A portable electrochemical workstation and a specially designed snap-in interface are then used for portable detection of SO2-3. The structure and composition of CuO were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), etc. The elec-trochemical performance of the CuO/rGO/SPE sensor was evaluated by cyclic voltammetry (CV) and electro-chemical impedance spectroscopy (EIS). The linear response range of the electrode was 1-300 mu M, the electrode sensitivity was 122.3 mu Acm- 2mM-1, and the detection limit was 0.2425 mu M. Therefore, the CuO/rGO/SPE electrode has remarkable selectivity, stability, and reliability.