通过将巯基乙酸作为一种支持电解质,将巯基固定在导电聚吡咯薄膜电极上,从而制得巯基—聚吡咯薄膜修饰电极,该修饰电极保持了巯基的螯合性能,并具有良好的稳定性。对水溶液中的重金属离子具有很好的吸附作用,其灵敏度与未修饰的玻碳电极相比,测汞离子时电沉积提高了3倍,化学吸附时提高了近5倍。并对其吸附机理进行了初步的探讨,证明了其对汞离子的吸附为不可逆的产物弱吸附。 By using thioglycolic acid as a supporting electrolyte, the thiol groups were immobilized on the conductive polypyrrole film electrode to obtain the thiol-polypyrrole film modified electrode, which maintained the chelating property of thiol group and had good stability. It has good adsorption on heavy metal ions in aqueous solution. Compared with unmodified glassy carbon electrode, its sensitivity is three times higher than that of unmodified glassy carbon electrode and about five times higher than that of chemical adsorption. The mechanism of adsorption was discussed preliminarily, and the adsorption of mercury ion was proved to be weak adsorption of irreversible product.