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应用循环伏安法 (CV)、线性扫描伏安法 (LSV)等电化学技术研究了杀虫单的极谱伏安行为。在 0 2mol/LHAc NaAc底液中 ;杀虫单有一良好的还原峰 ,峰电位 (Ep)在 - 0 94V (vs ,SCE) ;杀虫单浓度在 3× 10 -3 ～ 5× 10 -5mol/L范围内 ,峰高与浓度有良好的线性关系 ,相关系数r=0 9978。运用 5× 10 -4 mol/L杀虫单进行 6次平行实验 ,标准偏差为 0 2 2 % ,该方法对杀虫单的添加回收率为 98 81%～ 99 43%。实验证明该峰具有吸附性。提出了电极反应机理 ,包括杀虫单在汞电极上吸附以及完全不可逆的四电子还原过程 ,同时用量子化学计算方法对杀虫单的各原子的净电荷以及Mulliken键级进行了计算 ,从理论上解释了杀虫单电化学还原机理。
The polarographic voltammetric behavior of pest insects was studied by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). In the 0 2 mol / L HAc NaAc solution, there was a good reduction peak in pest control alone with the peak potential (Ep) at -0 94V (vs, SCE); the single insecticide concentration was in the range of 3 × 10 -3 ~5 × 10 -5 mol / L range, peak height and concentration have a good linear relationship, the correlation coefficient r = 0 9978. Six parallel experiments were carried out with 5 × 10 -4 mol / L insecticide alone, with a standard deviation of 0.222%. The recoveries of insecticidal insecticides by this method were 98 81% -99 43%. Experiments show that the peak has adsorption. The electrode reaction mechanism was proposed, including the adsorption of pesticide alone on the mercury electrode and the completely irreversible four-electron reduction process. Meanwhile, the net charge and Mulliken bond order of each atom of the insecticidal single were calculated by quantum chemical calculation. Explained the insecticidal single electrochemical reduction mechanism.