▎ 摘　　要

A novel carbon paste electrode (CPE) modified with three-dimensional graphene (3D-GN) has been developed for sensitive, selective and rapid determination of chloride ion (Cl-) for the first time. Compared with bare carbon paste electrode (CPE) and graphene nanosheets modified CPE (GN/CPE), the peak current of Cl- on 3DGN/CPE was sharply increased. The sensitivity achieved 0.156 mu A mM(-1) cm(-2), which was nearly 1500-fold than bare CPE. The response time was less than 30 s and steady fill 120 s. Using differential pulse voltammetry (DPV), the peak current at around 0.05 V was linear with the concentration of Cl- from 0.5 to 1000 mM, and the limit of detection was calculated to be 0.2 mM (S/N = 3). After 100 test using a same electrode, the peak current of Cl- was still 90-110% of the first time, showing the outstanding reusability. The proposed sensor was successfully applied in real water samples.