Abstract: The electrochemical behaviors of the olaquindox were studied in acetate and phosphate buffer solutions respectively. In the phosphate buffer solution, at pH=7.0, two sensitive adsorptive waves were obtained by single-sweep polarography. The second peak height (h_p2) of derivative wave is proportional to cola from 4×10^-8 to 2×10^-5mol/L. The detection limit is down to 1×10^-8mol/L. On the surface of mercury electrode, the adsorption of olaquindox obeys Frumkin isotherm. The adsorption coefficient β=9.1×10⁴ and the interaction factor v=0.8 were determined. In acetate buffer solution, at pH=4.5, three adsorptive waves can be obtained. The rate constants of the surface electrode reaction as k_s1=2.1s^-1，k_s2=2.2s^-1，k_s3=1.8×10³s^-1were determined. The mechanisms of electrode reactions were discussed in the two buffer solutions.

Key words: olaquindox, quinoxaline, cyclic voltammography, chronocoulometry, single-sweep polarography

摘要： 研究了喹乙醇在醋酸盐和磷酸盐两种缓冲溶液中的电化学行为。在pH=7.0的磷酸盐缓冲溶液中，使用单扫示波极谱获得了灵敏的吸附波。其导数波的波高h_p2与c_ola在4×10^-8～2×10^-5mol/L范围内成正比关系，检测下限为1×10^-8mol/L。在汞电极表面，喹乙醇的吸附遵从Frumkin吸附等温式。测定出吸附系数β=9.1×10⁴，吸引因素ν=0.8。在pH=4.5的醋酸盐缓冲溶液中，可以获得3个吸附波。分别测定出了3个波的表面电极反应速率常数k_s1=2.1s^-1，k_s2=2.2s^-1，k_s3=1.8×10³s^-1。分别讨论了两种缓冲溶液中的电极反应机理。

关键词: 喹乙醇, 喹垩啉, 循环伏安法, 计时电量法, 单扫极谱