中文摘要：

为了快速萃取分离Pa,并了解Pa在水溶液中的化学性质,以甲基异丁基酮（MIBK）为萃取剂,苯为稀释剂,以^233Pa为示踪剂,研究了盐酸溶液中Pa（Ⅴ）的萃取行为,讨论了萃取时间、盐酸浓度、萃取剂浓度和HF对萃取Pa（Ⅴ）的影响.结果表明,萃取在10 s内达到平衡,甲基异丁基酮能够从大于8 mol/L的HCl溶液中定量萃取Pa,同时HCl介质中加入少量的HF会严重改变Pa的萃取行为.

英文摘要：

In order to rapidly separate Pa and further study Pa solution chemistry, the solvent extraction of protactinium from HCl medium by methylisobutyketone in benzene was investigated at different concentration of extractants and HCl. The effect of shaking time on the extraction of protactinium with 6 mol/L methylisobutyketone in benzene from 8 mol/L HCl and mixed HCl-0.03 mol/L HF solutions was also discussed on the basis of the experimental results. It can be concluded that extraction equilibrium can be reached within 10 s, methyli- sobutyketone can almost quantitatively extract protactinium from 8 mol/L HCl solution, at the same time, the presence of 0.03 mol/L HF in HCl solutions seriously affect the extraction behavior of protactinium （ V ）.