▎ 摘　　要

In this study, a novel bismuth film/graphene-beta-cyclodextrin-Nafion composite modified glassy carbon electrode (GR-beta-CD-Nafion-GCE) was developed for trace cadmium detection using square wave anodic stripping voltammetry (SWASV). The morphologies and electrochemistry properties of the modified electrode were characterized by SWASV, chronoamperometry, cyclic voltammetry (CV) and scanning electron microscopy (SEM). It was found that the GR-beta-CD-Nafion-GCE exhibited remarkable enhancement effects towards cadmium ions detection which remarkably facilitate the electron transport and enlarge the specific surface area of the electrode. With ideal circumstance, the anodic stripping currents displayed a good linear relationship to concentration in the ranges from 1 to 500 mu gL(-1) and 800 to 2000 mu gL(-1) with a detection limit of 0.3 mu g/L (S/N = 3). The sensor was further applied to the detection of cadmium ions with satisfactory results in soil extracts and exhibited a good reusability and stability.