caa a22 4500 46911021X CHVBK 20180323133108.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF02040729 doi (NATIONALLICENCE)springer-10.1007/BF02040729 Synergic extraction of trivalent gadolinium, europium and americium radionuclides by 15-crown-5 or 18-crown-6 mixed with thenoyltrifluoroacetone from perchlorate medium [Elektronische Daten] [F. Shehata, S. Khalifa, H. Aly] Synergic extraction of trivalent Eu, Gd and Am from aqueous perchlorate medium has been studied using mixtures of thenoyltrifluoroacetone (HTTA) and 15-crown-5 or 18-crown-6 (CE) in chloroform at (25±1) °C. Slope analysis of the extraction results indicated a general formula of M(TTA)3·(CE)2 for the extracted species. The stability order took the sequence Eu(TTA)3·(CE)2>Am(TTA)3)·(CE)2>>Gd(TTA)3·(CE)2 with 15C5 and Am(TTA)3·(CE)2>Eu(TTA)3·(CE)2>Gd(TTA)3·(CE)2 with 18C6. The synergic factors, extracton constants and formation constants of the extracted species were determined and discussed in terms of the correspondence between cavity size of the crown ethers and ionic crystal radii. Akadùmiai Kiadó, 1992 Shehata F. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut Khalifa S. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut Aly H. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 353-361 0236-5731 159:2<353 1992 159 10967 https://doi.org/10.1007/BF02040729 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02040729 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shehata F. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut NATIONALLICENCE 700 1- Khalifa S. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut NATIONALLICENCE 700 1- Aly H. Hot Laboratories Centre, Atomic Energy Authority, 13758, Cairo, (Egypt) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 353-361 0236-5731 159:2<353 1992 159 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer