Synergistic extraction of lanthanoids with heterocyclic beta-ketoenols and 2,4,6-tri(2-pyridyl)-1,3,5-triazine,TPTZ Part II.Extraction of La(III),Eu(III) and Lu(III) with a bis(4-acyl-5-hydroxypyrazole) and TPTZ

摘要

The synergistic solvent extraction of three trivalent rare earth ions Ln(III) (Ln:La,Eu,Lu),from 0.1 M nitrate medium with l,12-bis(l'-phenyl-3'-methyl-5'-hydroxy-4'-pyrazolyl)-dodecane-l,12-dione,HL-10-LH and 2,4,6-tri(2-pyridyl)-l,3,5-triazine,TPTZ,in chloroform,has been studied.Various types of extracted species were highlighted.For lanthanum and europium,two complexes were co-extracted:for high extraction values,the major extracted species were Ln(L-10-L)(L-10-LH)TPTZ;however,for low extraction values,La(L-10-LH)2TPTZ,NO3 and Eu(L-10-L)TPTZ,NO_3 were extracted.For lutetium,evidence was given of the extraction of a single species Lu(L-10-L)TPTZ,NO3 in the whole range of extraction values.While the efficiency order of extraction with HL-10-LH was La < Eu < Lu,that of synergistic extraction with HL-10-LH and TPTZ was La < Lu < Eu:this order was controlled by the synergistic donor agent TPTZ.