Journal
RADIOCHIMICA ACTA
Volume 94, Issue 6-7, Pages 313-317Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/ract.2006.94.6.313
Keywords
neptunium(IV); isoxazolone; solvent extraction; TOPO
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The extraction behaviour of Np(IV) by 3-phenyl-4-acetyl-5-isoxazolone (HPAI) was investigated from nitric acid medium in the presence of tri-n-octyl phosphine oxide (TOPO). Speciation studies, carried out by the slope analysis method, yielded binary species of the type Np(PAI)4 when only HPAI was used as the extractant and ternary and quaternary species of the type Np(PAI)(4)(TOPO)-T-. and Np(PAI)(3)(.)(NO3)(TOPO)-T-., respectively when both HPAI and TOPO were used together as the extractants. The two-phase extraction constant for the binary species (log k(ex)) was calculated to be 8.44 +/- 0.05 while those for the ternary and quaternary species were found to be 12.84 +/- 0.22 and 11.26 +/- 0.07, respectively.
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