Determination of Copper and Bismuth by Differential Potential Stripping with Selenium Doped Carbon Paste Electrode
Received:April 14, 2012  Revised:September 05, 2012
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DOI:doi:10.3969/j.issn.2095-1035.2012.04.004
KeyWord:differential potential stripping method;carbon paste electrode doped with selenium;copper;bismuth
        
AuthorInstitution
TAN Junlin 桂林理工大学 化学与生物工程学院,广西 桂林 
HU Cunjie 桂林理工大学 化学与生物工程学院,广西 桂林 
LI Jianping 桂林理工大学 化学与生物工程学院,广西 桂林 
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Abstract:
      differential potential stripping method based on employment of the selenium powder doped carbon paste electrode (Se/CPE) was established to simultaneously determine copper and bismuth. In the 0.05 mol/L HCl solution and at the constant potential of -0.3 V (vs. Ag/AgCl), Cu2+and Bi3+ were electrodeposited on the electrode surface. Then copper and bismuth were stripped from the electrode surface due to the reaction with the dissolved oxygen in the solution, which lead to generation of sensitive oxidation stripping peaks at 0.30 V and 0.02 V, respectively. Using this method, it was found that the peak heights of differential potential stripping peaks have linear relationship with the concentrations of the copper and bismuth in the concentration range of 5.0×10-9~1.55×10-7 mol/L. The determination limits of copper and bismuth were 4.0×10-9 mol/L and 2.5×10-9 mol/L(S/N=3), respectively. The procedure has been applied to simultaneously determine copper and bismuth in actual samples with satisfactory results.
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