1989 Volume 5 Issue 6 Pages 739-743
The extraction behavior of Lanthanoid elements has been investigated using such β-diketone derivatives (HA) as dodecylbenzoyltrifluoroacetone (LIX 51), benzoylisooctanoylmethane (LIX 54) and dibenzoy methane (DBM) in kerosene. Trivalent Lanthanoid ions (M3+) were extracted as tris-β-diketonate (MA3); the extraction tendency followed the sequence L1×51_??_L1×54>DBM. The extraction constants (Kex) for lanthanoid elements increased with an increase in their atomic number, and a "tetrad effect" was approximately observed for each extraction system. The mean separation factor between adjacent elements was evaluated to be 1.71 for LIX51, 1.95 for LIX54 and 2.23 for DBM.
