Solvent Extraction of Alkaline Earth Metal Ions Using N,N'-Bis-(2-hydroxy-5-nitrophenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine

Solvent extraction is a very effective method for the separation of metal ions. Research and development of an extraction reagent with high selectivity has been carried out. We have been synthesized the multidentate ligands such as ethylenediamine derivatives having four pendant arms and evaluated the selectivity for transition metal ions. In this research, the order of selectivity for alkaline earth metal ions using N, N'-Bis (2-hydroxy-5-nitrophenylmethyl) -N, N'-bis (2-pyridylmethyl) -1, 2-ethanediamine (H2Nbbpen) as an extraction reagent was evaluated and compared to those of thenoyltrifluoroaceton (TTA) and N, N'-Bis- (2-hydroxy-3, 5-dichlorophenylmethyl) -N, N'-bis (2-pyridylmethyl) -1, 2- ethanediamine (H2dClbbpen) . The difference in the Sr-Ba extraction constants in the H2Nbbpen system was larger than those in TTA and H2dClbbpen systems.