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000863975 1001_ $$0P:(DE-Juel1)168262$$aKlass, Larissa$$b0$$ufzj
000863975 245__ $$aEvaluation of the hydrophilic complexant N,N,N’,N’-tetraethyldiglycolamide (TEDGA) and its methyl-substituted analogues in the selective Am(III) separation
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000863975 520__ $$aN,N,N’,N’-tetraethyldiglycolamide (TEDGA) is used in the French EXAm (extraction of americium) process to separate Am(III) from Cm(III) and Ln(III). In this study, the complexation behavior of TEDGA towards actinides(III) and lanthanides(III) was compared to its methyl-substituted derivatives Me-TEDGA and Me2-TEDGA under experimental conditions applying to the EXAm process. Using the EXAm solvent, 0.6 mol/L N,N’-dimethyl-N,N’-dioctyl-hexylethoxymalonamide (DMDOHEMA) and 0.45 mol/L bis(2-ethylhexyl)-phosphoric acid (HDEHP), An(III) and Ln(III) distribution ratios increase in the order TEDGA < Me-TEDGA < Me2-TEDGA. This is explained by differences in the strength of complexation in the aqueous phase: Conditional stability constants for the formation of [Cm(DGA)x]3+ complexes decrease in the order TEDGA > Me-TEDGA > Me2-TEDGA, as shown by time-resolved laser fluorescence spectroscopy (TRLFS). TRLFS measurements verified the exclusive existence of [Cm(DGA)3]3+ complexes in the aqueous phase. Both the homoleptic [Cm(DMDOHEMA)n]3+ and the heteroleptic [Cm(DGA)x(DMDOHEMA)y]3+ complexes were detected in the organic phase, as postulated in the literature.[14]
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000863975 7001_ $$0P:(DE-Juel1)130438$$aWilden, Andreas$$b1$$ufzj
000863975 7001_ $$0P:(DE-Juel1)176187$$aKreft, Fabian$$b2$$ufzj
000863975 7001_ $$0P:(DE-HGF)0$$aWagner, Christoph$$b3
000863975 7001_ $$0P:(DE-HGF)0$$aGeist, Andreas$$b4
000863975 7001_ $$0P:(DE-HGF)0$$aPanak, Petra J.$$b5
000863975 7001_ $$0P:(DE-HGF)0$$aHerdzik-Koniecko, Irena$$b6
000863975 7001_ $$0P:(DE-HGF)0$$aNarbutt, Jerzy$$b7
000863975 7001_ $$0P:(DE-Juel1)130383$$aModolo, Giuseppe$$b8$$eCorresponding author$$ufzj
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