改性钠基蒙脱土修饰电极上百草枯的电化学行为及测定

制备了十六烷基三甲基溴化铵(CTAB)改性钠基蒙脱土修饰电极，用循环伏安法研究了百草枯在该修饰电极上的电化学行为，结果表明该电极过程受扩散控制。计算了电极过程的部分动力学参数：电极的电活化面积Aeff=2.108mm2，扩散系数D=5.73×10-4cm2/s。用方波溶出伏安法优化了测定参数，测定了浓度与峰电流ipa1的线性关系，发现ipa1与百草枯浓度在9.660×10-7~3.865×10-4 mol/L范围内呈线性关系，检测限为3.297×10–7 mol/L，用该方法测定了实际水样中百草枯的含量，增敏回收率为：94.55%~108.25%。

The Electrochemical Behaviour and Determination of Paraquat on Modified Sodium Montmorillonite Based on Glassy Carbon Electrode

Hexadecyltrimethylammonium bromide (CTAB) modified clay electrode was made. The electrochemical behavior of paraquat (PQ) was studied by cyclic voltammetry and the results indicated that the process was controlled by diffusion. The important electrochemical parameters including the effective area of CTAB NaMM-CMC/GCE Aeff=2.108mm2, and the diffusion coefficient D=5.73×10-4cm2/s were calculated. Determination parameters were optimized and the correlation between peak current and concentration was studied by square wave stripping voltammetry (SWSV). From the results we can find a good linearity between the peak current and concentration of PQ in the range of 9.660×10-7~3.865×10-4 mol/L, and its detect limitation was 3.297×10–7 mol/L. The content of PQ in real water was detected with SWSV and the spiked recovery rate for ipa1 was between 94.55% and 108.25%.