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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 and Np(PAI) 3 ·(NO 3 )·TOPO, 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.

Extraction of neptunium(IV) by a mixture of 3-phenyl-4-acetyl-5-isoxazolone and tri- n -octyl phosphine oxide