摘要
目的:研究马来酸氯苯那敏(chlorphenamine maleate,CPM)在玻碳电极(GCE)及多壁碳纳米管修饰玻碳电极(MWCNT/GCE)上的电化学行为、电化学动力学和电化学分析厅法。方法:采用循环伏安法(CV)、计时库仑法(CC)、计时电流法(CA)、线性扫描伏安法(LSV)。结果:与 GCE 相比,CPM 在 MWCNT/GCE 上氧化峰电流明显增大,氧化峰电位负移90 mV,表明MWCNT/GCE 对 CPM 电化学氧化具有良好的催化作用。同时研究了实验条件对 CPM 电化学行为的影响。CPM 住 GCE 及MWCNT/GCE 上在扫描速度10~1000 mV·s^(-1)范围内氧化峰电流(I_(pa))与扫描速度平方根(v^(1/2))成正比,其电化学氧化反应是-受扩散控制的电极过程。研究了 CPM 在 GCE 及 MWCNT/GCE 上氧化峰电流与浓度分别在5.0×10^(-5)~1.5×10^(-3)mol·L^(-1)范围内呈良好的线性关系,检出限分别为1.0×10^(-5),5.0×10^(-6)mol·L^(-1)。RSD 在0.56%~1.8%之间,加样回收率在99,5%~103.8%之间。同时分别测定了 CPM 在 GCE 及 MWCNT/GCE 上的电极过程动力学参数:电荷转移系数(α)分别为0.77,0.90;扩散系数(D)分别为5.60×10^(-8),6.48×10^(-8)cm^2·s^(-1);电极反应速率常数(k_j)分别为2.02×10^(-3),5.45×10^(-3)s^(-1)。结论:该方法灵敏度高,操作简单,可用于 CPM 的电化学测定。
Objective: Electrochemical behaviors, electrochemical kinetic and electroanalysis of chlorphenamine maleate (CPM) at glassy carbon electrode (GCE) and multi -wall carbon nanotubes modified glassy carbon electrode (MWCNT/GCE) were investigated. Methods : Cyclic voltammetry (CV) ; Chronocoulometry ( CC ) ; Chronoamperometry (CA) and linear scan voltammetry (LSV). Results:The experimental results showed that the direct electrochemical oxidation of CPM are sluggish on GCE, But the oxidation peak current of CPM increases significantly at MWCNT/GCE in comparison with that at GCE,which indicates that MWCNT/GCE can catalyze the electrochemical oxidation of CPM very well. Inventigation on the influence of the experimental conditions on CPM electrochemical behaviors was observed. It had showed that the electrode reaction process is a diffusion - limited. At the bare GCE and MWCNT/GCE the oxidation peak current is proportional to the concentration of CPM in the range of 5.0×10^-5 to 1.5 × 10^-3mol·L^-1. The detection limits were 1.0 × 10^-5mol·L^-1 and 5.0 × 10^-6mol·L^-1. The relative standard deviation is between 0. 56% -1.8% and the recoverage is in the range of 99. 5% -103.8%. At the same time the electron transfer coefficient α, diffusion coefficient D and the electrode reaction rate constant kf were determined at GCE and MWCNT/GCE by CC and CA,respectively,which gives the values of 0. 77 and 0.90; 5.60 ×10^-8cm^2·s^-1 and 6. 48 × 10^-8 cm^2·s^-1 ;2.02 × 10^-3 s^-1 and 5.45×10^-3 s^-1 ,respectively. Conclusion: This method can be applied in CPM electrochemical determination with both low detection limit and high sensitivity.
出处
《药物分析杂志》
CAS
CSCD
北大核心
2008年第6期865-869,共5页
Chinese Journal of Pharmaceutical Analysis
基金
宁夏高等学校科学研究基金(200623)
宁夏大学自然科学基金(ZR0641)资助项目