Extraction of Y(III), La(III), Ce(III), Th(IV) and U(VI) lons with Organophophorous Compounds

Abstract

The pH-dependent extraction of Y(III), La(III), Ce(III), Th(IV) and U(VI) ions with organophosphorous extractants such as bis(2ethylhexyl) phosphate (DEHPA), diphenyl phosphate (DPP) and diphenyl phosphinic acid (DPPA) in n-heptane, chloroform and n-amyl alcohol were investigated. All studied metal ions were extracted at highly acidic medium (pH 0.2-4.8) within 3 min at 96-99% yield using DEHPA, DPP and DPPA. The best solvent is chloroform for three studied extractants but n-heptane could be secondly usable solvent for only DEHPA. In the stripping studies, high recovery percentage was accomplished with 1 M NaOH and 0.1-1 M HCl for studied metal ions.