Linear sweep voltammetry for analysis of the concentration of copper chloride complex in CuCl2-NaCl solution
ZHANG Yan-qing1,2, LI He-ping*1, LIU Qing-you1, XU Li-ping1, ZHANG Lei3
1. Laboratory for Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2. Graduate University of Chinese Academy of Science, Beijing 100049, China; 3. Anhui Institute of Geological Surveying and Mapping, Hefei 230022, China
Abstract：The linear sweep voltammetry of copper chloride solution with and without NaCl was studied at room temperature and atmospheric pressure. The voltammetry curves in potential interval of 0-0.8 V (vs. OCP) were obtained. By comparing the curves of two solutions with scanning rate of 5 mV/s, it was found that Cu2+ reacted with Cl- after adding NaCl to form the complex ［CuCl3］- which participated in electrochemical reaction. Moreover, the voltammetry curves showed changes as follows: the peak potential of the first peak moved toward positive direction, the peak current of the second peak decreased remarkably, and the peak potential difference of two peaks broadened. When the potential was scanned with different rates, the showed reversibility of system was also different: the system was irreversible when the scanning rate was higher than 10 mV/s, while the reversibility of first electrode reaction was good in the range of 1-10 mV/s. In the reversible region of system, the initial concentration of complex ［CuCl3］- on electrode be calculated as 2.97×10-3 mol/L based on the relationship between peak current and scanning rate. The research idea and technical route of this study had important reference significance for electrochemical analysis of dissolved metal complex in the fields of hydro-metallurgy, geology and geochemistry in future.
张艳清，李和平*，刘庆友，徐丽萍，张磊. CuCl2-NaCl溶液中铜氯络合物浓度的线性扫描伏安法分析[J]. 冶金分析, 2011, 31(5): 1-6.
ZHANG Yan-qing, LI He-ping*, LIU Qing-you, XU Li-ping, ZHANG Lei. Linear sweep voltammetry for analysis of the concentration of copper chloride complex in CuCl2-NaCl solution. , 2011, 31(5): 1-6.
