▎ 摘　　要

Graphene nanosheets (GS) were prepared via ultrasonic exfoliation, and used to modify glass carbon electrode (GCE). Compared with GCE, the GS-modified GCE (GS/GCE) greatly increased the anodic stripping peak currents of Cd2+ and Pb2+. Moreover, the response signals of Cd2+ and Pb2+ on GS/GCE further enhanced remarkably in the presence of Bi3+. Based on the synergistic enhancement effects of GS and Bi3+, a novel electrochemical sensor was developed for Cd2+ and Pb2+. The detection limits were 0.35 and 0.045gL(-1) for Cd2+ and Pb2+. It was used in food sample analysis, and the accuracy was tested by ICP-MS.