Extraction of Europium (III) and Cobalt(II) by N,N,N',N'-Tetraoctyldiglycolamide and N,N,N',N'-Tetrahexyldiglycolamide from Aqueous Acid Solutions

摘要

N,N,N',N'-tetraoctyldiglycolamide (TODGA) and N,N,N',N'-tetrahexyldiglycolamide (THDGA) were synthesized and characterized in order to further evaluate them as extracting agents for Eu(III) and Co(II) from nitric and hydrochloric acid solutions. Analysis of the dependence of metal distribution ratio, D_M, on concentrations of reagents indicated that the dominant extracted complexes are Eu(TODGA)_3(NO_3)_3(HNO_3), Eu(THDGA)_3(NO_3)_3(HNO_3), Eu(THDGA)_3(NO_3)_3(HNO_3)_2 and Co(TODGA)C1_2(HCl). In addition, TODGA was evaluated for partitioning of Eu(III). It was concluded that, with acidity adjustment, Eu(III) can be separated from Zr(IV), Nb(V), Co(II) and Cs(I) in nitric and hydrochloric acids.