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《Chinese Journal of Pharmaceutical Analysis》 2011-07
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Modified electrode prepared on rare-earth heteropoly of salt and selective determination of dopamine in the presence of ascorbic acid

LUO Su-xing,WU Yuan-hui,QI Dan,YANG Ding-yun,CHEN Li-dong(Department ofChemistry,Zunyi Normal College,Zunyi 563002,China)  
Objective:The electrode modified with rare earth heteropoly acid salt was prepared.Electrochemical behaviors of dopamine(DA) in the modified electrode and selective determination of DA in the presence of large amount of ascorbic acid(AA) with the modified electrode were studied.Methods:Electrochemical impedance spectroscopy(EIS) and cyclic voltammetry(CV) and differential impulsive voltammetry(DPV) were used.Results:The modified electrode in sulphuric acid solution presented two quasi-reversible redox peaks and the electron transfer number was 2 and 4,respectively.The modified electrode had obvious catalytic effects on DA.The oxidation peaks of DA and AA could be distinguished by using CV and DPV methods.There were a good linear relationships between the oxidation peak currents of DA and the DA concentration within the concentration scope of 1×10-7–5×10-4 mol·L-1(CV),5×10-7–1.2×10-5 mol·L-1(DPV).Conclusion:The method of electrochemical determination of DA in the presence of large amount of AA is established,which can be used for the determination of DA in samples.
【Fund】: 贵州省教育厅自然科学研究资助项目(黔教科2008068);; 遵义市科技局社会发展项目(遵市科合社字[2008]24号)
【CateGory Index】: O657.1;R927.2
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