双酚A在纳米金-离子液体复合修饰电极上的电化学行为及测定  

Electrochemical Behavior and Determination of Bisphenol A on the Gold Nanoparticles-Ionic Liquid Modified Electrode

作　　者：何晓英[1] 宋桃[1] 樊光银[1] 廖钫[1] 魏胤[1] 华俊[1] 

机构地区：[1]西华师范大学化学化工学院,四川南充637002

出　　处：《分析测试学报》2011年第5期543-548,共6页Journal of Instrumental Analysis

基　　金：四川省教育厅资助项目(08zc007)

摘　　要：该文制备了纳米金-离子液体修饰电极(GNP-[BMIM]PF6/GCE),用红外光谱对GNP和[BMIM]PF6进行了表征。采用交流阻抗法研究了GNP-[BMIM]PF6/GCE的表面电化学特性,同时研究了双酚A(BPA)在该修饰电极上的循环伏安行为。结果表明,BPA在该修饰电极上出现1个氧化峰,无还原峰,为不可逆电化学反应。在40～280 mV.s-1扫速范围内,氧化峰电流与扫速的平方根呈线性关系,表明该电极过程受扩散控制。测得BPA在修饰电极上的反应电子数和电极有效面积分别为2和0.338 cm2。用方波伏安法对BPA进行测定,氧化峰电流(Ipa)与BPA浓度在5.0×10-8～2.5×10-4 mol.L-1范围内呈良好的线性关系,相关系数为0.997,检出限(S/N=3)为4.42×10-8 mol.L-1。用该法对实际水样进行测定,BPA的加标回收率为99%～105%。A novel gold nanoparticles（GNP） and ionic liquid ]PF6 modified glassy carbon electrode（GNP-]PF6/GCE） was prepared.GNP and ]PF6 were characterized by IR spectra.The electrode surface electrochemical property of GNP-]PF6 modified electrode was studied by electrochemical impedance spectroscopy（EIS） and the behavior of bisphenol A（BPA） on the modified elctrode was investigated by cyclic voltammetric method.The result indicated that one oxidation peak was observed on the modified electrode and no reduction peak was found,which showed that the electrochemical reaction of BPA on the electrode was an irreversible process.The oxidation peak currents were linear to v1/2 in the range of 40-280 mV·s-1,indicating that the electrode process was controlled by diffusion.The effective area and electron number of GNP-]PF6/GCE were calculated to be 0.338 cm2 and 2,respectively.The peak current was linear over BPA concentration in the range of 5.0×10-8-2.5×10-4 mol·L-1 with a correlation coefficient of 0.997,and the detection limit was 4.42×10-8 mol·L-1.The proposed method was successfully applied in the determination of BPA in real water samples with spiked recoveries of 99%-105%.

关 键 词：纳米金 离子液体 双酚A 方波伏安法 

分 类 号：O657.1[理学—分析化学] O625.311[理学—化学]