单宁酸在碳掺杂蒙脱土修饰电极上的电化学行为及测定  

Electrochemical Behavior and Determination of Tannic Acid on Carbon Dropped Montnorillonite Modified Glassy Carbon Electrode

作　　者：熊健[1] 李伟[1] 白玛卓嘎[1] 周勇[1] 李容[2] 

机构地区：[1]西藏大学理学院,西藏拉萨850000 [2]西华师范大学化学化工学院,四川南充637002

出　　处：《广州化工》2013年第17期114-116,130,共4页GuangZhou Chemical Industry

摘　　要：捅要：制备了碳掺杂蒙脱土修饰电极（C—MMT／GCE），采用循环伏安法研究了单宁酸在该修饰电极上的电化学行为。结果表明，该电极过程受吸附一扩散混合控制，转移电子数等于质子数n=m=1，电极有效面积Aeff=0．092cm^2，扩散系数D=1．66×10^-5cm^2／s。单宁酸的氧化峰电流与其浓度在8．0×10^-6～4．0×10^-4mol／L呈线性关系，检出限为1．0×10^-6mol／L，并测得单宁酸试样的回收率为97．6％～102．8％。该修饰电极具有良好的重现性。The modified electrode was made by carbon doped montmorillonite（ C -MMT/GCE）, and electrochemical behavior of tannic acid on electrode modified by the carbon doped montmorillonite was investigated by cyclic vohammetry （CV）. The results showed that the electrode process was controlled by absorption - diffusion, the number of electron transfer was equal to the number of protons （ n = m = 1 ）, the electrode effective area A = 0. 092 cm2, and the diffusion coefficient D = 1.66 × 10 -2 cm2/s. A good linearity between the peak current and the concentration of tannic acid was in a range of 4. 0 ×10-4 -8.0 × 10-6 mol/L, and its detect limitation was 1.0 × 10-6 mol/L. The standardized recovery rate was 97.6% - 102.8%. The modified electrode showed good reproducibility.

关 键 词：单宁酸 碳掺杂蒙脱土 修饰电极 循环伏安法 电化学行为 

分 类 号：O657.1[理学—分析化学]