“…N,N,N ,N -Tetraoctyl-3-pentane-diamide (TODGA) is extensively used in solvent extraction [3][4][5], extraction chromatography [6] and liquid membrane [7,8] techniques and has been found to be an efficient extractant, showing rather unique feature of extracting bivalent, trivalent, tetravalent and hexavalent metal ions with equal ease [9]. On the other hand, the branched analog, N,N,N ,Ntetra-2-ethylhexyl-3-pentane-diamide (T2EHDGA) shows higher selectivity though with lower extraction efficiency [10].…”