丁香酚在改性蒙脱土修饰电极上的电化学行为及测定

Electrochemical behavior and determination of eugenol on modified montmorillonite modified glassy carbon electrode

制备了十八烷基三甲基溴化铵(STMAB)改性蒙脱土修饰电极,用循环伏安法和差分脉冲伏安法(DPV)研究了丁香酚在该电极上的电化学行为。在pH6.0 PBS电解液中,丁香酚在该电极上的电极反应受扩散控制,转移电子数等于质子数n=m=2,电极有效面积Aeff=0.034cm2,扩散系数D=2.58×10-6cm2/s。在优化的实验条件下,差分脉冲伏安法峰电流与丁香酚的浓度在6.0×10-6～4.0×10-4 mol/L范围呈线性关系,检出限为4.75×10-7 mol/L,并测得丁香酚试样的回收率为97.5%～101.7%。

STMAB-MMT/GCE was made by montmorillonite modified by STMAB. The electrochemical behavior of eugenol on the STMAB-MMT/GCE was investigated by cyclic voltammetry and differential pulse vohammetry. The results showed that the eugenol on the electrode in the electrode reaction was controlled by diffision in PBS （ pH = 6. 0）. The number of electron transfer was equal to the number of protons （ n = m = 2 ）, the effective area of STMAB-MMT/GCE Aeff=0. 034 cm^2, the diffusion coefficient D =2. 58 × 10^-6cm^2/s. Under the optimized conditions, differential pulse voltammetry peak current and the concentration of eugenol in a range of 6.0 × 10 ^-6 -4. 0 ×10^-4 mol/L was linear relation, and its detect limitation was 4. 75 × 10^-7 mol/L. The recovery of eugenol sample was between 97.5% and 101.7%.