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目的研究替硝唑(TNZ)在玻碳电极(GCE),多壁碳纳米管修饰电极(MWCNTs/GCE)及疏水性室温离子液体(RTIL)1-丁基-3-甲基咪唑六氟磷酸盐(BMIMPF6)-多壁碳纳米管(MWCNT)修饰电极(RTIL-MWCNTs/GCE)上的电化学行为,电化学动力学性质及电化学定量分析方法。方法运用循环伏安法(CV)、计时库仑法(CC)、计时电流法(CA)、方波伏安法(SWV)、稳态电流-时间曲线及电化学交流阻抗谱。结果与GCE相比,TNZ在RTIL-MWCNTs/GCE上的还原峰电位正移了105 mV,还原峰电流增大了约5倍;与MWCNTs/GCE相比,其还原峰电位稍有负移,但还原峰电流增大。TNZ在RTIL-MWCNTs/GCE上的还原峰电流与浓度在5.0×10-5~1.0×10-2 mol.L-1内呈良好线性关系,检出限为2.4×10-6 mol.L-1。加标回收率在98.7%~100.2%之间,RSD在0.64%~1.65%之间。结论RTIL-MWCNTs/GCE对TNZ电化学还原具有良好的催化作用,是一受扩散控制的不可逆电极反应过程,该方法可用于TNZ含量的电化学定量测定,操作简便快捷,测定结果符合定量测定要求。
Objective To investigate the effect of tinidazole (TNZ) on the surface of glassy carbon electrode (GCE), MWCNTs / GCE and RTIL 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) - MWCNT Modified Electrode (RTIL-MWCNTs / GCE) Electrochemical Behavior, Electrochemical Kinetics and Electrochemical Quantitative Analysis. Methods Cyclic voltammetry (CV), chrono coulometric (CC), chronoamperometry (CA), square wave voltammetry (SWV), steady state current - time curve and electrochemical impedance spectroscopy were used. Results Compared with GCE, the reduction peak potential of TNZ at RTIL-MWCNTs / GCE was shifted by 105 mV and the reduction peak current increased by about 5 times. Compared with MWCNTs / GCE, the reduction peak potential of TNZ was slightly negative, However, the reduction peak current increases. The reduction peak currents of TNZ on RTIL-MWCNTs / GCE showed a good linear relationship with the concentration of 5.0 × 10-5-1.0 × 10-2 mol·L-1, with a detection limit of 2.4 × 10-6 mol.L- 1. The spiked recoveries ranged from 98.7% to 100.2% with RSDs ranging from 0.64% to 1.65%. CONCLUSION: RTIL-MWCNTs / GCE has good catalytic activity for electrochemical reduction of TNZ and is an irreversible electrode reaction controlled by diffusion. This method can be used for the electrochemical quantitative determination of TNZ content. The method is simple and rapid, and the determination results meet the requirements of quantitative determination .