Speciation and Complex Formation of Zirconium(IV) with Tc(VII) and Re(VII) in Liquid-Liquid Extraction Systems.

ABSTRACT: The formation of Tc-(VII)-Zr-(IV) species in nitric acid and their extraction in kerosene/tributyl phosphate (TBP) phases was studied. The technetium distribution coefficient (D _Tc) was evaluated as a function of nitric acid concentration (1-7 M) and is in the range of 25-37, which is significantly higher compared to solutions that do not contain zirconium and confirms the synergism of their coextraction. Emphasis was placed on 1 M HNO₃ solution, which is the initial concentration used in uranium extraction during spent nuclear fuel reprocessing. The behavior of pertechnetate under these conditions is complex, primarily due to the formation of Tc-(VII)-Zr-(IV) species, a phenomenon that remains under investigation. In order to describe the coextraction mechanis

SUBMITTER: Novikov AP 

PROVIDER: S-EPMC12391960 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature