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ｈｐ２与ｃｏｌａ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ｋｓ１＝２．１ｓ－１，ｋｓ２＝２．２ｓ－１，ｋｓ３＝１．８×１０３ｓ－１。分别讨论了两种缓冲溶液中的电极反应机理。
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 c ola from 4×10 -8 to 2×10 -5 mol/L. The detection limit is down to 1×10 -8 mol/L. On the surface of mercury electrode, the adsorption of olaquindox obeys Frumkin isotherm. The adsorption coefficient β =9.1×10 4 and the interaction factor ν =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 =1.8×10 3s -1 were determined. The mechanisms of electrode reactions were discussed in the two buffer solutions.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第6期691-698,共8页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
关键词
喹乙醇
喹垩啉
循环伏安法
电化学行为
olaquindox
quinoxaline
cyclic voltammography
chronocoulometry
single sweep polarography
