采用乙炔黑(AcetyleneBlack,AB)和离子液体(1-丁基-3-甲基咪唑六氟磷酸盐[BMIM]PF。)作为复合修饰材料,制备乙炔黑-离子液体复合修饰电极(AB-[BMIM]PF。/GCE)。用红外光谱法对AB—EBMIM]PF6/GCE进行表征,用循环伏安法(CV)研究阿昔洛韦(ACV)在该修饰电极上的电化学行为。实验结果表明,在pH=4.70的磷酸盐缓冲液(PBS)中,ACV在该修饰电极上出现一氧化峰。在20~280mV/s扫速范围内,氧化峰电流与扫速平方根呈线性关系,表明该电极过程是受扩散控制。电极过程的部分动力学参数分别为:电极有效面积0.076cm2,转移电子数2,扩散系数1.817×10-4^cm2/s。用方波伏安法(SWV)测定一系列不同浓度的ACV溶液,结果表明其氧化峰电流与ACV浓度在7.0×10-1^~1.0×10-4^mol/L范围内呈良好线性关系,相关系数为0.993,检出限(s/N=3)为2.30×10mol/L,加标回收率为95.0%~105.6%。
A new AB-[-BMIM]PF6/GCE was fabricated by modification of Acetylene Black(AB) and Ionic liquids(1-butyl-3-rnethylimidazotium hexafluorophosphate ([BMIM-]PF6) on glass carbon etetrode (GCE). The AB-FBMIM]PF6/GCE was successfully used for determination of Acyclovir(ACV) by means of cyclic voltammetry(CV), showing a sensitive oxidation peak in pH 4.70 PBS buffer solution. The oxidation peak current was linear to v1/2 in the range of 20-280 mV/s with correlation coefficient of 0. 990, showing a diffusion-controlled electrochemical process. Square wave voltammetry was used to determine the concentration of ACV and a good linearity was found between the peak current of AB- [-BMIM-]PF6/GCE and the concentration of ACV in the range of 7.0 × 10 -7^- 1. 0 × 10-4^ mol/L. The detection limit is 2.30 × 10-7 mol/L(S/N=3) and the recoveries for the spiked samples were 95.0%- 105.6%.