caa a22 4500 378881868 CHVBK 20180305123433.0 cr unu---uuuuu 161128e20030301xx s 000 0 eng 10.1524/ract.91.3.127.19983 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.3.127.19983 Thermodynamics of extraction of Am(III) and Eu(III) from different anionic media with Tri-n-octyl phosphine oxide [Elektronische Daten] [G. Suresh, M. S. Murali, J. N. Mathur] Extraction of Am(III) and Eu(III) from NO3-, ClO4-, SCN- and NO3- + ClO4- media with tri-n-octyl phosphine oxide (TOPO) in xylene has been carried out at 15, 25, 30 and 35°C. Under the extraction conditions the species M(NO3)3·3TOPO, M(SCN)3·4TOPO, M(ClO4)3·4TOPO and MNO3(ClO4)2·4TOPO are predominantly extracted at all the temperatures (M=Am or Eu). The two phase equilibrium constant (log Kex) follows an order SCN- > NO3- + ClO4- > ClO4-> NO3-. Extraction enthalpies have been calculated in each system from the temperature dependence of the Kex. The thermodynamic parameters ΔG, ΔH and ΔS have been discussed and compared with other mono- and bidentate organophosphorus extractants for Am(III) and Eu(III) from same aqueous medium. The -ΔH values for the two-phase reaction follow an order NO3- + ClO4- > ClO4- > SCN- > NO3- for both metal ions. This has been explained on the basis of heat energies involved with the formation of ML3 complex (L being the anion used), the transfer of ML3 to the organic phase and the attachment of TOPO molecules, and also on the limiting partial molal volume of the anions. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Suresh G. aut Murali M. S. aut Mathur J. N. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/3/2003(2003-03-01), 127-134 0033-8230 91:3/2003<127 2003 91 ract https://doi.org/10.1524/ract.91.3.127.19983 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.3.127.19983 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Suresh G. aut NATIONALLICENCE 700 1- Murali M. S. aut NATIONALLICENCE 700 1- Mathur J. N. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/3/2003(2003-03-01), 127-134 0033-8230 91:3/2003<127 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter