铁基蒙脱土修饰电极上多巴胺的电化学行为及其测定

制备了FeC l3改性蒙脱土修饰电极,采用循环伏安法研究了多巴胺（DA）在该电极上的电化学行为.结果表明,电极过程为扩散控制的准可逆过程,其氧化峰电流与浓度在1.0×10^-5-4.0×10^-3mol·L^-1范围内呈良好的线性关系,其线性回归方程为：Ipa（A）=-3.288 04×10^-6-0.035 99 C（mol·L^-1）,相关系数R为0.997 6,检测限可达2.88×10^-6mol·L^-1,回收率在95.4%-103.1%之间,为DA的测定建立了一种电化学方法.

Electrochemical Behavior and Detection of Dopamine at Modified Montmorillonite Electrode Activation

FeCl3 modified clay electrode was made. The electrochemical behavior of dopamine was studied on modified montmorillonite Electrode Activation by Cyclic vohammetry. The result indicated that the electrode process was a quasi-reversible electrode reaction and controlled by diffusibility. And from the result we can find a good linearity between the oxidation peak current and concentration of DA in the range of 1.0 × 10^-5 mol· L^-1 -4.0 × 10^-3mol · L^-1, With a detection limit of 2.88 × 10^-6 mol· L^-1, the linear equation is Ipa（A） = -3. 288 04 × 10^-6 -0. 035 99c （mol ·L^-1） ,whose relative coefficient is 0. 997 6. The recoveries test gave values in the range of 95.4% - 103.1% , a direct electroanalytical method for determing DA was established.