左旋多巴在多壁碳纳米管-双十六烷基磷酸薄膜修饰电极上的电化学行为及测定
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摘要
采用循环伏安法和计时库伦法,研究了左旋多巴(LDA)在多壁碳纳米管-双十六烷基磷酸(MWCNTs-DHP)膜修饰电极上的电化学行为。结果表明电极反应是一个2电子准可逆过程,其中氧化反应是由扩散控制,还原反应由吸附控制。MWCNTs-DHP膜修饰电极对LDA的氧化有很好催化作用。采用差分脉冲伏安法(DPA)考察阳极峰电流与LDA浓度的关系,LDA在2.0×10~(-7)到3.0×10~(-5) mol·L~(-1)浓度范围内与DPV峰电流成线性关系,据此可建立LDA浓度测定的新方法。
The electrochemical behavior of L-dopa at a multiwall carbon nanotube modified glass carbon electrode was studied by cyclic voltammetry and chronocoulometry.The results showed that electrode reaction was a two-electron quasi-reversible process,in which oxidation was controlled by diffusion and reduction by adsorption.In comparison with the bare electrode, the modified one showed remarkable electrochemical catalysis towards the oxidation of L-dopa and its peak current was greatly enhanced.The good mechannic strength of modified film and favorable linear relationship between the anodic peak current and the concentration in a range of 2.0×10~(-7) mol·L~(-1)-3.0×10~(-5) mol·L~(-1) provide a new method for determination of L-dopa.
The electrochemical behavior of L-dopa at a multiwall carbon nanotube modified glass carbon electrode was studied by cyclic voltammetry and chronocoulometry.The results showed that electrode reaction was a two-electron quasi-reversible process,in which oxidation was controlled by diffusion and reduction by adsorption.In comparison with the bare electrode, the modified one showed remarkable electrochemical catalysis towards the oxidation of L-dopa and its peak current was greatly enhanced.The good mechannic strength of modified film and favorable linear relationship between the anodic peak current and the concentration in a range of 2.0×10~(-7) mol·L~(-1)-3.0×10~(-5) mol·L~(-1) provide a new method for determination of L-dopa.
引文
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