引用本文:
尉艳, 王广凤, 陈辉, 方宾. 纳米磷钨酸铈/碳纳米管复合修饰电极的制备及对多巴胺的测定[J]. 应用化学,
2008, 25(5): 514-518.
Citation: WEI Yan, WANG Guang-Feng, CHEN Hui, FANG Bin. Preparation of Cerium Tungstophosphoric Acid/Multiwalled Carbon Composite Modified Electrode and Its Application[J]. Chinese Journal of Applied Chemistry, 2008, 25(5): 514-518.
Citation: WEI Yan, WANG Guang-Feng, CHEN Hui, FANG Bin. Preparation of Cerium Tungstophosphoric Acid/Multiwalled Carbon Composite Modified Electrode and Its Application[J]. Chinese Journal of Applied Chemistry, 2008, 25(5): 514-518.
纳米磷钨酸铈/碳纳米管复合修饰电极的制备及对多巴胺的测定
摘要:
制备出负载纳米磷钨酸铈的碳纳米管修饰电极,用电化学阻抗谱(EIS)和循环伏安法(CV)对该修饰电极进行表征。研究了多巴胺(DA)在该修饰电极上的电化学行为。结果发现,这种纳米粒子对DA的氧化具有良好的催化作用。在pH=6.0的磷酸缓冲溶液中,DA在该修饰电极上的氧化还原式电位为0.173 V。采用计时电流法测定DA,其氧化峰电流与浓度在5.0×10-7~5.0×10-3 mol/L范围内呈线性关系,线性回归方程为ip(μA)=-0.9542+0.05602c(μmol/L),相关系数λ=0.9987。检测限为3.3×10-8 mol/L(S/N=3)。该方法可用于盐酸多巴胺注射液中的多巴胺的测定,并能有效的排除抗坏血酸(AA)的干扰。
English
Preparation of Cerium Tungstophosphoric Acid/Multiwalled Carbon Composite Modified Electrode and Its Application
Abstract:
CePW nanoparticles supported on multi-wall carbon nanotubes were prepared,and modified onto a glassy carbon electrode.Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the electrode.The electrochemical behavior of dopamine at this modified electrode was investigated,and the result showed that it gave reversible redox peaks at a formal potential of 0.173 V(pH=6.0).The anodic peak current (measured with constant potential amperometry) increased linearly with the increased concentration of dopamine in a range of 5.0×10-7 to 5.0×10-3 mol/L and the linear regression equation was ip(μA)=-0.954 2+0.056 02c(μmol/L).The detection limit (S/N=3) obtained was 3.3×10-8 mol/L.The interference of ascorbic acid to the determination of DA could be eliminated efficiently.The proposed method showed excellent sensitivity and recovery.
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