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@ARTICLE{Kaufholz:281801,
author = {Kaufholz, Peter and Modolo, Giuseppe and Wilden, Andreas
and Sadowski, Fabian and Bosbach, Dirk and Wagner, Christoph
and Geist, Andreas and Panak, Petra and Lewis, Frank and
Harwood, Laurence},
title = {{S}olvent extraction and fluorescence spectroscopic
investigation of the selective {A}m({III}) complexation with
{TS}-{BTP}hen},
journal = {Solvent extraction and ion exchange},
volume = {34},
number = {2},
issn = {0736-6299},
address = {Philadelphia, PA},
publisher = {Taylor $\&$ Francis},
reportid = {FZJ-2016-01470},
pages = {126-140},
year = {2016},
abstract = {An americium(III) selective separation procedure was
developed based on the coextraction of trivalent actinides
(An(III)) and lanthanides (Ln(III)) by TODGA
(N,N,N′,N′-tetraoctyl-diglycolamide), followed by
Am(III) selective stripping using the hydrophilic complexing
agent TS-BTPhen
(3,3′,3ʺ,3ʺ′-[3-(1,10-phenanthroline-2,9-diyl)-1,2,4-triazine-5,5,6,6-tetrayl]tetrabenzenesulfonic
acid). Distribution ratios were found at an acidity of 0.65
mol L−1 nitric acid that allowed for the separation of
Am(III) from Cm(III) (DCm > 1; DAm < 1), giving a separation
factor between curium and americium of SFCm/Am = 3.6 within
the stripping step. Furthermore, Am(III) was readily
separated from the lanthanides with the lowest selectivity
for the Ln(III)/Am(III) separation being lanthanum with a
separation factor of SFLa/Am = 20. The influence of the
TS-BTPhen concentration on Am(III) distribution ratios was
studied, giving a slope (logD vs. log[TS-BTPhen]) of
approximately −1 for the stripping of An(III) with
TS-BTPhen from the TODGA-based organic phase. Time-resolved
laser fluorescence spectroscopy (TRLFS) measurements of
curium(III) were used to analyze the speciation of
Cm(III)-TS-BTPhen complexes. Both 1:1 and 1:2 complexes were
identified in single-phase experiments. The formation of the
1:1 complex was suppressed in 0.5 mol L−1 nitric acid but
it was significantly present in HClO4 at pH 3. Conditional
stability constants of the complex species were calculated
from the TRLFS experiments.},
cin = {IEK-6},
ddc = {540},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {161 - Nuclear Waste Management (POF3-161) / SACSESS -
Safety of ACtinide Separation proceSSes (323282) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-161 / G:(EU-Grant)323282 /
G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000373896500003},
doi = {10.1080/07366299.2016.1151308},
url = {https://juser.fz-juelich.de/record/281801},
}