▎ 摘　　要

In this work, a sensitive electrochemical platform for determination of cadmium was obtained using graphene-Nafion modified bismuth film glassy carbon electrode by differential pulse anodic stripping voltammetry (DPASV) analysis. The performances of the graphene-modified sensor were systemically studied. It demonstrated that the graphene-modified sensor exhibited superior analytical performance for cadmium over a linear range from 1 mu g L-1 to 100 mu g L-1, with a detection limit of 0.3 mu g L-1. It was also successfully differentiated cadmium form other interferent (such as zinc salts, calcium salts, benzene etc.). As a result, this graphene-modified sensor proved to be a reliable and environment friendly tool for the effective monitoring of cadmium ions existing in tap water and residues of cadmium in the drug.