Extraction of Lu(III) from an aqueous LuCl3 solution at pH 3.5 into an organic phase containing 5% (v/v) di(2-
ethylhexyl)phosphoric acid (DEHPA) in di-n-hexyl ether (DHE) immobilized within a polypropylene hollow fiber membrane
and a simultaneous back-extraction of Lu(III) into 2 mol dm−3 HCl solution has been investigated using two miniaturized
supported liquid membrane (SLM) systems: (i) a single hollow fiber membrane