食品科学

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双酚A在离子液体修饰碳糊电极上的电化学行为及测定

花小霞,郑香丽,刘 珊,夏方诠,周长利   

  1. 济南大学化学化工学院,山东 济南 250022
  • 出版日期:2015-11-25 发布日期:2015-12-03
  • 通讯作者: 周长利
  • 基金资助:

    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)

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

HUA Xiaoxia, ZHENG Xiangli, LIU Shan, XIA Fangquan, ZHOU Changli   

  1. College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
  • Online:2015-11-25 Published:2015-12-03
  • Contact: ZHOU Changli

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(pH 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。

关键词: 离子液体, 化学修饰电极, 双酚A, 食品检测

Abstract:

In this work, a 1-cyanoethyl-3-methylimidazolium hexafluorophosphate (CMIMPF6) 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 (ks) 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 (RSN = 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.

Key words: ionic liquid, chemically modified electrode, bisphenol A, food detection

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