香兰素在AB/PABSA/GCE修饰电极上的电化学行为及测定  

Electrocatalytic Behavior and Determination of Vanillin at Acetylene Black/Poly Amino Benzene Sulfonic Acid Modified Electrode

作　　者：李桂芳[1] 贾晶[1] 何晓英[1] 

机构地区：[1]西华师范大学化学化工学院电化学研究所,四川南充637002

出　　处：《分析测试学报》2015年第3期357-361,共5页Journal of Instrumental Analysis

基　　金：四川省高校科技创新团队建设项目(2010008)

摘　　要：采用电聚合和滴涂法制备了乙炔黑/聚对氨基苯磺酸修饰电极（AB/PABSA/GCE）,并用交流阻抗法（EIS）进行了表征,运用循环伏安法（CV）对实验条件进行优化后,研究了香兰素（Van）在AB/PABSA/GCE上的电化学行为.结果表明,在pH 7.0的PBS溶液中,Van在该修饰电极上有1个氧化峰,无还原峰,在40 ～ 300 mV/s扫速范围内,Van氧化峰电流与扫速呈线性关系,说明Van在该电极上的电化学反应过程是受吸附控制的不可逆过程.该反应过程中电子转移数及参加反应的质子数均为2,电极有效面积A =0.065 7cm2,扩散系数D=1.557×10-3 cm2/s,反应物吸附量Γ=2.249×10-8 mol/cm2.采用计时电流法（CA）对不同浓度的Van进行测定,结果发现在5～460 μmol/L浓度范围内,氧化峰电流与浓度呈良好的线性关系（r=-0.998 5）,检出限为2.09×10-7 mol/L.运用该方法对巧克力样品进行了检测,回收率为93.0％～114.2％.An acetylene black/poly amino benzene sulfonic acid modified electrode （AB/PABSA/ GCE） was prepared using electrical aggregation and coating. The modified electrode was character- ized by electrochemical impedance spectroscopy （EIS）. The electrochemical behavior of vanillin （Van） on AB/PABSA/GCE was investigated by cyclic vohammetry（CV）. The results showed that there was an obvious oxidation peak of Van on the modified electrode in pH 7.0 PBS buffer solution and the oxidation peak current was linear with the scanning rate in the range of 40 - 300 mV/s, which indicated that the electrode process of Van was irreversible and controlled by absorption. The electron number（n） , proton number（m） , effective area（A ） , diffusion coefficients （D） and the ab- sorbanee of reactant were calculated to be 2, 2, 0. 065 7 cm2, 1. 557 × 10-3 cm2/s, 2. 249 × 10-8 mol/em2 in the electrode reaction process. The different concentrations of Van were determined by ehronoamperometry, and a good linear relationship between oxidation peak current and Van concen- tration was observed in the range of 5 -460 μmol/L. The detection limit（S/N =3） was 2.09 × 10-7 mol/L. The method was successfully applied in the determination of Van in chocolate sample with recoveries of 93.0% - 114. 2% .

关 键 词：乙炔黑 对氨基苯磺酸 香兰素 电聚合 计时电流法 

分 类 号：O657.1[理学—分析化学] S816.74[理学—化学]