TY  - JOUR
AU  - Klass, Larissa
AU  - Wilden, Andreas
AU  - Kreft, Fabian
AU  - Wagner, Christoph
AU  - Geist, Andreas
AU  - Panak, Petra J.
AU  - Herdzik-Koniecko, Irena
AU  - Narbutt, Jerzy
AU  - Modolo, Giuseppe
TI  - Evaluation of the hydrophilic complexant N,N,N’,N’-tetraethyldiglycolamide (TEDGA) and its methyl-substituted analogues in the selective Am(III) separation
JO  - Solvent extraction and ion exchange
VL  - 37
IS  - 5
SN  - 0736-6299
CY  - Philadelphia, PA
PB  - Taylor & Francis
M1  - FZJ-2019-03891
SP  - 297-312
PY  - 2019
AB  - N,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]
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000483877000001
DO  - DOI:10.1080/07366299.2019.1651039
UR  - https://juser.fz-juelich.de/record/863975
ER  -