在含1.0×10-3mol·L-1杯[4]芳烃的0.1 mol·L-1四丁基高氯酸铵溶液中,在-0.2~-0.8 V(vs.Ag/AgCl)电位区间进行扫描,在玻碳电极表面电沉积一层杯[4]芳烃膜,从而制得杯[4]芳烃修饰玻碳电极。采用交流阻抗法和原子力显微镜对电极的表面性能进行了表征,采用循环伏安法对其电化学性能进行研究。试验发现：汞在杯[4]芳烃修饰玻碳电极上出现一个明显氧化峰,氧化峰电位为0.28 V(vs.Ag/AgCl)。在优化的试验条件下,Hg2+浓度在2.0×10-6~1.7×10-3mol·L-1范围内与氧化峰电流呈线性关系,检出限(3S/N)为5.0×10-7mol·L-1。修饰电极用于自制水样中汞的测定,所得结果与火焰原子吸收光谱法测定值相一致。

The modified electrode was prepared by electrodeposition of a film of calix[4]arene on the surface of glassy carbon electrode (GCE) through scanning over the potential range from -0.2 to -0.8 V (vs. Ag/AgCl) from a solution of 1.0×10-3mol·L-1 calix[4]arene dissolved in 0.1 mol·L-1 tetrabutyl ammonium perchlorate. The surface property of the calix[4]arene modified GCE were studied by AC impedance method and atomic force microscopy (AFM), and its electrochemical property studied by cyclic voltammetry. It was found that the calix[4]arene modified GCE showed a remarkable oxidation peak of Hg at the potential of 0.28 V (vs. Ag/AgCl). Under the optimized experimental conditions, linear relationship between values of oxidation peak current and concentration of mercury(Ⅱ) was obtained in the range of 2.0×10-6-1.7×10-3mol·L-1, with its detection limit (3S/N) of 5.0×10-7mol·L-1. The proposed method was used in the analysis of a simulated water sample, the results ontained were in conformity with those found by FAAS.