盐酸吡哆辛在聚甲苯胺蓝/多壁碳纳米管修饰电极上的电化学行为及其测定

The Electrochemical Behavior and Determination of VB_6 at Polymeric Toluidine Blue/Multi-walled Nanotubes Modified Electrode

制备了聚甲苯胺蓝、碳纳米管及二者复合修饰的4种修饰电极,以循环伏安法研究盐酸吡哆辛在几种修饰电极上的结果表明:聚甲苯胺蓝/多壁碳纳米管修饰电极对盐酸吡哆辛的电化学响应最佳,峰电位负移45 mV,峰电流约为裸玻碳电极的3倍.盐酸吡哆辛在聚甲苯胺蓝/多壁碳纳米管修饰电极上是扩散控制不可逆氧化过程,电子转移数为1,质子数为1,电极活化面积为0.0409 cm2,扩散系数为6.3433×10-4cm2/s.氧化峰电流与浓度在8.0×10-6-4.0×10-4mol/L范围内呈良好的线性关系,线性方程为:ip(A)=-1.9865×10-6-0.1052c(mol/L),R=-0.9968,检出限为2.0×10-6mol/L,样品回收率为:92.63%-101.50%.

Polymeric toluidine blue and carbon nanotubes and four kinds of modified electrodes were prepared. The electrochemical behavior of VB6 at modified electrodes were studied with cyclic vohammetry. The results indicated that the polymeric＇ toluidine blue/multi-walled carbon nanotubes modified electrode showed excellent electrochemical activities towards VB6,peak potential shifted negatively 45 mV,the peak current is 2 times higher than the bare glass electrode, the oxidation of VB6 on PTB/MWNT/GC was irreversible and mainly controlled by diffusion. The electron transfer number was 1, proton transfer number was 1, the effective area of electrode was 0. 0409 cm^2, diffusion eoeffcient was 6. 3433 × 10^-4 cm^2/s. A good linearity relationship between peak current and concentration in the range of 8.0 × 10^-6 - 4. 0 × 10^-4mol/L was found, of which the equation was ip （A） = - 1. 9865 × 10^-6 - 0. 1052c（mol/L） , the correlative coefficient R = -0. 9968, and detection limit was 2.0 × 10^-6mol/L. The sample recovery was between 92.63% and 101.50%