Determination of trace copper in water by electrochemiluminescence method using ZnS/AuNPs/ITO modified electrode
YE You-sheng1,2, GUO Rong-fang1, ZHANG Ying1, XIE Shi-ying1, SUN Lan-feng1
1. College of Chemistry and Material Engineering of Chaohu College, Chaohu 238000, China; 2.Water Environment Research Center of Chaohu College, Chaohu 238000, China
Abstract：During the determination of trace copper by conventional method, there are some problems such as tedious operation and low sensitivity. To solve these problems, a new method for the determination of trace copper by electrochemiluminescence method using ZnS/Gold nanoparticles (AuNPs)/indium tin oxide (ITO) glass electrode was established. AuNPs and ZnS were deposited on ITO glass surface by the electrodeposition method to prepare the ZnS/AuNPs/ITO electrode. The optical and electrochemical behaviors of the modified electrode were investigated, and the preparation conditions were optimized. The results showed that Cu2+ could inhibit the electrochemiluminescence of modified electrode with AuNPs as carrier and ZnS as luminescent material. The relative value of electrochemiluminescence showed linear relationship with the logarithm of Cu2+ concentration in range of 1×10-11-5×10-8. The detection limit of method was 0.52×10-11 mol/L. The proposed method was applied to the determination of trace copper in water samples. The relative standard deviation (RSD, n=6) was not more than 1.3%, and the recoveries were between 97% and 105%. The found results by this method were basically consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS).
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