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

COMPLEX REACTIONS OF DTPA WITH URANIUM、NEPTUNIUM AND PLUTONIUM Ⅲ OXIDATION REDUCTION REACTIONS IN TBP DTPA U、Np、Pu SYSTEM

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）。

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).