DTPA与铀、镎、钚的配位作用   Ⅲ.TBP-DTPA-铀、镎、钚体系中的氧化还原反应

摘要: 研究了ＴＢＰ－ＤＴＰＡ配位萃取体系中铀、镎、钚的一些氧化还原反应。实验结果表明，在ＴＢＰ－ＤＴＰＡ体系中，用Ｕ（Ⅳ）能迅速地把Ｐｕ（Ⅳ）和Ｎｐ（Ⅴ）还原为Ｐｕ（Ⅲ）和Ｎｐ（Ⅳ）；而Ｈ２Ｏ２能迅速地将Ｕ（Ⅳ）氧化至Ｕ（Ⅵ），但对Ｐｕ（Ⅲ）和Ｎｐ（Ⅳ）的氧化速度相对较慢，Ｐｕ（Ⅲ）能氧化到Ｐｕ（Ⅵ），而Ｎｐ（Ⅳ）只能氧化到Ｎｐ（Ⅴ）。

Abstract: COMPLEX REACTIONS OF DTPA WITH URANIUM、NEPTUNIUM AND PLUTONIUM ⅢOXIDATIONREDUCTION REACTIONS IN TBPDTPAU、Np、Pu SYSTEMWu Qiulin(Institute of Nuclear Energy Technology,Tsinghua University,Beijing 102201)Chen Shuming Li Guanghong(Beijing Institute of Nuclear Engineering,Beijing 100840)ABSTRACTSome oxidationreduction reactions in the complexextraction systems of TBPDTPAU,Np,Pu have been investigated.The results show that Np(Ⅴ),Np(Ⅵ) and Pu(Ⅳ) can be rapidly reduced to Np(Ⅳ) and Pu(Ⅲ) by U(Ⅳ) in the TBPDTPA system.In such a system U(Ⅳ) can be rapidly oxidized by H2O2 to U(Ⅵ),but the oxidation reactions for Np(Ⅳ) and Pu(Ⅲ) are relatively slow.Pu(Ⅲ) can be oxidized to Pu(Ⅵ),while Np(Ⅳ) can only be oxidized to Np(Ⅴ).Key words Dietylenetriaminepentaacetic acid(DTPA) Uranium Neptunium Plutonium Oxidationreduction reaction