双酚A在离子液体修饰碳糊电极上的电化学行为及测定  

Electrochemical Behavior and Determination of Bisphenol A at Carbon Paste Electrode Modified with Ionic Liquid

作　　者：花小霞 郑香丽 刘珊[1] 夏方诠[1] 周长利[1] 

机构地区：[1]济南大学化学化工学院,山东济南250022

出　　处：《食品科学》2015年第22期152-155,共4页Food Science

基　　金：山东省自然科学基金项目(ZR2009BM034);国家自然科学基金青年科学基金项目(21077044)

摘　　要：制备1-氰乙基-3-甲基咪唑六氟磷酸盐离子液体修饰碳糊电极,研究双酚A（bisphenol A,BPA）在离子液体修饰碳糊电极上的电化学行为。结果表明,在0.1？mol/L？B-R缓冲液（p H 10.0）中,BPA在0.415 V处产生一良好的氧化峰,具有明显的电催化增敏作用。BPA的氧化过程为伴随有质子转移的表面吸附控制的不可逆过程,其电极反应速率为0.32/s。建立了示差脉冲伏安法测定痕量BPA的方法,线性范围为3.0×10^-7~6.0×10^-5 mol/L,检出限为5.0×10^-8 mol/L（RSN=3）。并将其用于奶瓶样品中迁移BPA的测定,结果表明该传感方法为直接电化学检测BPA提供了一种新的思路。In this work,a 1-cyanoethyl-3-methylimidazolium hexafluorophosphate（CMIMPF_6） modified ionic liquid carbon paste electrode（ILCPE） was fabricated.The electrochemical behavior of bisphenol A（BPA） at the ILCPE electrode was studied in detail.In 0.1 mol/L B-R buffer solution（pH 10.0）,a well-defined anodic peak was produced at 0.415 V.The ILCPE electrode showed good catalytic activity and sensitizing effect on the oxidation of BPA in the B-R solution.The investigation of the electrode process indicated that the electrochemical oxidation of BPA was an irreversible process with a controlled adsorption,and that protons participated in the electrode reaction process.The corresponding electrochemical rate constant（k_s） was 0.32/s.The limit of detection and the linear range of BPA concentration against oxidation peek current were 5.0×10^-8 mol/L（R（SN）=3） and 3.0×10^-7-6.0×10^-5 mol/L,respectively.Differential pulse voltammetry has been applied to the determination of microamounts of BPA in feeding bottle samples with satisfactory results.

关 键 词：离子液体 化学修饰电极 双酚A 食品检测 

分 类 号：S859.84[农业科学—临床兽医学]