Abstract: In the buffer solution of acetate, at pH5.2, a sensitive adsorptive complex wave of vanadium(Ⅳ)-quercetin(Qu) can be obtained by single-sweep polarography. The detection limit was down to 7.0×10^-8 mol/L. The composition of complex was detected as V(Ⅳ)∶Qu=1∶1. The rate constant of the surface electrochemical reaction was determined as ks=3.9 s^-1.

Key words: vanadium, quercetin, adsorptive complex wave, single-sweep polarography

摘要： 在pH5.2的醋酸盐缓冲底液中，用单扫示波极谱法可获得灵敏的V(Ⅳ)-槲皮素络合物吸附波。钒浓度在1.0×10^-7 mol/L--1.0×10^-5 mol/L范围内与二阶导数波峰高成正比关系，检测下限为7.0×10^-8 mol/L。测得电活性络合物组成为V(Ⅳ)∶Qu=1∶1，条件稳定常数为3.3×10⁵。表面电极反应速率常数ks=3.9 s^-1。

关键词: 钒, 槲皮素, 络合物吸附波, 单扫极谱法