▎ 摘　　要

This paper studied the electrochemical sensors based on C-C bonding of graphene oxide (GO) pi-conjugated aromatic group modified gold electrodes for simultaneous detection of heavy metal ions. For comparison, another sensing interface Au-Ph-NH-CO-GO, in which GO was modified to Au-Ph-NH2 interfaces by amide bonding. On the basis of the principle of heavy metal ions complexation with oxygenated species on GO, the fabricated sensing interfaces were used for the simultaneous determination of Pb2+, Cu2+ and Hg2+. The performance of two sensing interfaces for simultaneous detection of three metal ions was compared. Au-Ph-GO sensing interface demonstrated higher sensitivity and better repeatability than Au-Ph-NH-CO-GO sensing interface.