Abstract: In 0.1 mol/L ClCH₂CＯＯＨ-ClCH₂ＣＯＯＮa buffer solution, at pH3.2, a sensitive catalytic wave of Ti(Ⅳ)-quercetin-NaClO₃ is obtained by using singlesweep polarography. The detection limit of titanium is 7.0×10^-9mol/L. It was used to determine trace titanium in pure metallic magnesium. The composition of complex has been detected as Ti(Ⅳ)∶Qu=1∶1, and the rate constant of catalytic reaction k=4.8×10⁵(mol/L)^-1·s^-1 has been determined.

Key words: titanium, quercetin, catalytic wave, single-sweep polarography

摘要： 在pH3.2氯乙酸盐缓冲底液中，用单扫极谱法可获得灵敏的钛(Ⅳ)-槲皮素-氯酸盐催化波，其二阶导数检测限达7.0×10^-9mol/L。已成功地应用于纯金属镁中10^-4%钛的测定，并测得电活性络合物的组成为Ti(Ⅳ)∶槲皮素＝1∶1，平行催化反应的速率常数k=4.8×10⁵(mol/L)^-1·s^-1。

关键词: 钛, 槲皮素, 极谱催化波, 单扫极谱法