RECOVERY OF TRANSACTINIDE ELEMENTS BY ION-EXCHANGE CHROMATOGRAPHY FROM SOLUTIONS CONTAINING VARIOUS COMPLEXING AGENTS AND ION-EXCHANGE CHROMATOGRAPHIC STUDY OF THE CHEMISTRY OF THESE ELEMENTS - SIMULATION EXPERIMENTS

Ion-exchange properties of d-transition elements of Groups IVB, VB, an d VIE (Hf, Zr, Nh, and W), actinides (Th-Cf), and Sr were studied in s olutions of HF, H2SO4, and H3PO4 as influenced by the solution composi tion, the concentration of complexing agents, and the nature of an ion exchanger. The d-transition elements were used to simulate elements 1 04, 105, and 106, respectively. The main relationships in ion-exchange behavior of the tested elements were revealed. The best conditions fo r recovery of transactinides and their separation from trivalent TPEs and light actinides (Th, Pa, U, Np, and Pu) in the tested solutions we re determined. The best separation conditions of Group IVB and IVB ele ments on a single cation-exchange column were also found. The possibil ities of ion-exchange chromatography as a tool for studying chemical p roperties of transactinide traces in the tested systems were shown.