▎ 摘　　要

A Hg2+-related quenching photoluminescence (PL) sensor was fabricated based on nitrogen-doped graphene quantum dots (N-GQDs) as the luminescent agent and glutathione as the masking agent to detect Hg(2+)in tap water. The addition of Hg(2+)significantly reduced the PL intensity of N-GQDs, which was attributed to coordination reaction inducing the aggregation of N-GQDs. The Hg2+-related quenching PL sensor with glutathione as the masking agent has good selectivity and accuracy. The sensor showed a linear relationship ranging from 0.5 to 110 nM with the detection limit 0.08 nM (S/N = 3). The proposed method was applied to the determination of Hg(2+)in tap water, and the results were consistent with atomic absorption spectroscopy (AAS).