Simultaneously Detection of Pb2+ and Hg2+ Using Electrochemically Reduced Graphene Oxide

摘要

In this work, graphene oxide (GO) was electrochemically reduced on the surface of glassy carbon electrodes (GCE) to fabricate a sensitive sensor for rapidly simultaneous determination of lead(II) and mercury (II) in water. The electrochemically reduced grahene oxide (ERGO) modified GCE exhibited enhanced analytical performance toward Pb2 +and Hg2+ because of the remarkable surface area, fantastic electrical conductivity and great adsorptive capability of ERGO. The peak currents at about - 0.18 V for Cu2+ and 0.08 V for Hg2+ were measured. The concentration of GO, deposition potential and accumulation time was investigated. Under optimum conditions, the limit of detection (LOD) for the ERGO modified GCE (ERGO/GCE) toward Pb2 +and Hg2 + is 0.2 ng/mL and 1 ng/mL respectively, and the linear range of Pb2 +and Hg2 + is 1~1000 ng/mL and 1~1000 ng/mL. The ERGO modified electrode exhibited great repeatability and reproducibility, making it applicable for the fast simultaneous detection of lead (II) and mercury (II) in actual samples.