电聚合oImBPTPPMn(Ⅲ)Cl膜修饰玻碳电极同时测定抗坏血酸和多巴胺
膜修饰电极,,膜修饰电极，oImBPTPPMn(Ⅲ)Cl，电聚合，玻碳电极，抗坏血酸，多巴胺,摘要,关键词,1引言
摘 要用循环伏安法在强酸性水溶液中制备出氯化5邻\[4(1咪唑基)丁氧基\]苯基10,15,20三苯基卟啉锰聚合膜修饰玻碳电极。该电极具有良好的电化学活性，对抗坏血酸(AA)及多巴胺(DA)有明显的催化作用，而且在同一缓冲溶液中用微分脉冲伏安法扫描二者峰电位差达240 mV，此时已达到完全分离。将该电极应用于DA和AA的同时测定，其线性范围分别为2.0×10-6~1.0×10-4 mol/L和6.5×10-7~2.6×10-5 mol/L;检出限分别为1.0 μmol/L和0.39 μmol/L。二者在微分脉冲伏安法扫描时各有独立的电流响应峰，互不干扰。该电极重现性和稳定性好，在空气中放置3个月以上经处理后电化学活性无下降趋势。
关键词 膜修饰电极，oImBPTPPMn(Ⅲ)Cl，电聚合，玻碳电极，抗坏血酸，多巴胺
Simultaneous Determination of Ascorbic Acid and Dopamine at Electro Polymerized Manganese(Ⅲ)5[o(1Imidazolyl)butoxy]phenyl10，15，20triphenyl porphrine Chloride Film Modified Glassy Carbon Electrode
Deng Xuerong1, Wang Lishi*2, Zhang Shuifeng2, Liu Xiaoxiao1, Mo Jinyuan3
(School of Chemical Science, South China University of Technology, Guangzhou 510640)
(School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640)
(School of Chemistry and Chemical Engineering, Sun Vatsen University, Guangzhou 510275)
Abstract The electropolymerization of manganese(Ⅲ)5[o(1imidazolyl)butoxyl]phenyl10,15,20triphenylporphrine chloride (oImBPTPPMn(Ⅲ)Cl) produces stable and electrochemically active film from strong acidic aqueous solutions. Cyclic voltammetry was used to study the in situ growth of poly(oImBPTPP Mn(Ⅲ)Cl) films. The electrode was also employed to study the electrocatalytic oxidation of ascorbic acid (AA) and dopamine (DA), using cyclic voltammery. It has been found that the oxidation of AA at the surface of poly(oImBPTPP Mn(Ⅲ)Cl) films modified glassy carbon electrode occurs at a potential of about 407mV more negative than that of an unmodified glassy carbon electrode. Differential pulse voltammograms (DPV) of simultaneous determination of AA and DA exhibit linear dynamic rang from 2.0×10-6 to 1.0×10-4 mol/L and a detection limit of 1.0 μmol/L for AA, and corresponding linear dynamic rang from 6.5×10-7 to 2.6×10-5 mol/L and a detection limit of 0.39 μmol/L for DA. In DPV, the poly(oImBPTPP Mn(Ⅲ)Cl) films modified glassy carbon electrode could separate completely the oxidation peak potentials of AA and DA for about 240 mV present in the same buffer solution of 0.1 mol/L phosphate, though at the unmodified glassy carbon electrode the peak potentials were indistinguishable. This modified electrode was quite effective not only to detect AA and DA individually, but also to determine simultaneously each component concentration in the mixture, and they will not affect each other. ......
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