caa a22 4500 378941348 CHVBK 20180305123653.0 cr unu---uuuuu 161128e20040201xx s 000 0 eng 10.1524/ract.92.2.95.27458 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.2.95.27458 Extraction of tetravalent neptunium isoxazolonates as their TOPO adducts [Elektronische Daten] [S. Banerjee, P. K. Mohapatra, A. Bhattacharyya, S. Basu, V. K. Manchanda] The extraction behaviour of Np(IV) by 3-phenyl-4-benzoyl-5-isoxazolone (HPBI) in the presence of tri-n-octyl phosphine oxide (TOPO) was investigated from nitric acid medium. The speciation studies, carried out by the slope analysis method, yielded binary species of the type Np(PBI)4 when only HPBI was used as the extractant and ternary species of the type Np(PBI)4·TOPO when both HPBI and TOPO were used as the extractants. The two-phase extraction constant for the binary species (log kex) was calculated to be 10.11±0.03, while that for the ternary species was found to be 17.24±0.05. Thermodynamic parameters for the binary and ternary extraction systems were also determined. Both the binary and ternary extraction systems were found to be highly spontaneous processes with predominant enthalpy stabilization. The very high negative entropy factor suggested contribution of unfavourable steric factors. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Banerjee S. aut Mohapatra P. K. aut Bhattacharyya A. aut Basu S. aut Manchanda V. K. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/2/2004(2004-02-01), 95-100 0033-8230 92:2/2004<95 2004 92 ract https://doi.org/10.1524/ract.92.2.95.27458 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.2.95.27458 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Banerjee S. aut NATIONALLICENCE 700 1- Mohapatra P. K. aut NATIONALLICENCE 700 1- Bhattacharyya A. aut NATIONALLICENCE 700 1- Basu S. aut NATIONALLICENCE 700 1- Manchanda V. K. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/2/2004(2004-02-01), 95-100 0033-8230 92:2/2004<95 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter