Abstract
An electrochemiluminescence (ECL) sensor for mercury (II) was developed based on the cation exchange reaction between Hg2+ and CdS due to the large difference in the sedimentation equilibrium constant. To fabricate the sensor, CdS nanowires (CdS NWs) serving as the emitter were introduced upon a glass carbon electrode (GCE). Gold nanoparticles (Au NPs) with excellent electrical conductivity were introduced on the surface of CdS NWs/GCE to enhance the sensor performance. In the presence of Hg2+, the electrochemiluminescence of the sensor decreased. The electrochemiluminescence intensity was negatively correlated with the concentration of Hg2+. The excellent performance of Au NPs:CdS NWs/GCE, combined with the difference in the CdS and HgS sedimentation equilibrium constants, endows the sensor with good selectivity and sensitivity for the analyte. A long linear range from 6.7 × 10−15 M to 1.0 × 10−8 M was obtained for Hg2+ with a detection limit of 5.0 × 10−15 M. The applicability of the method was validated by the analysis of water and lake water.
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