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1,1,1-tris(N,N-diisobutylcarbamoyl-methyleneoxymethyl)propane (L) has been prepared and characterized by using IR,  1 H NMR and positive-ion FAB mass spectra. The extraction of Th 4+  and UO 2  2+  with L was studied as a function of concentration of free extractant in an organic phase and of picrate in an aqueous phase from a picrate-nitrate medium at 293±1K. It was found that the extractability of L for Th 4+  is larger than that for UO 2  2+ . Both extraction % of Th 4+  and UO 2  2+  decreased with an increase in the concentration of HNO 3 . The mechanism of extraction of Th 4+  with L was proposed. The composition of extracted species of L with Th 4+  in the organic phase is ThL(Pic) 2 (NO 3 ) 2 . The results of extraction of trace  234 Th 4+  with L from the picrate-nitrate medium containing UO 2  2+  (the initial concentration of UO 2  2+ ,  C  0  UO₂²⁺ =1.23×10 -4 mol/dm 3  (M)) agreed well with those from the extraction of single component solutions. The tripodand is useful in separation of Th 4+  and UO 2  2+  from each other in picrate-nitrate media with a relatively high separation factor.

Solvent extraction and separation of thorium(IV) and uranium(VI) by an ether-amide type tripodand