▎ 摘　　要

The electrochemiluminescence (ECL) of the Ru(phen)(3)(2+) /thymine (T) system at bare and graphene oxide (GO)-modified glassy carbon (GC) electrodes was utilized to determine Hg2+ in tap water. The ECL intensity of Ru(phen)(3)(2+) was considerably enhanced by the addition of thymine because of the occurrence of ECL tion between them. Subsequently, the ECL intensity of Ru(phen)(3)(2+) /T system rapidly decreased with the addition of Hg2+ because of the formation of a T-Hg2+-T complex. A linear response (R-2=0.9914) was obtained over a Hg2+ concentration range of 1.0x10(-9) mol/L to 1.0x10(-5) mol/L with a detection limit of 3.4x10(-10) mol/L at a bare GC electrode in 0.1 mol/L phosphate buffer (pH=8.0). The detection limit can be further reduced to 4.2x10(-12) mol/L after modification of the GC electrode by GO. To verify its applicability, the proposed method was utilized to determine Hg2+ in tap water and simulated wastewater. The method exhibited good reproducibility and stability and thus reveals the possibility of developing a novel ECL detection method for Hg2+.