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Johansen, M. P.*; Child, D. P.*; Collins, R.*; Cook, M.*; Davis, J.*; Hotchkis, M. A. C.*; Howard, D. L.*; Howell, N.*; Ikeda, Atsushi; Young, E.*
Science of the Total Environment, 842, p.156755_1 - 156755_11, 2022/10
Times Cited Count:6 Percentile:47.65(Environmental Sciences)Toigawa, Tomohiro; Peterman, D. R.*; Meeker, D. S.*; Grimes, T. S.*; Zalupski, P. R.*; Mezyk, S. P.*; Cook, A. R.*; Yamashita, Shinichi*; Kumagai, Yuta; Matsumura, Tatsuro; et al.
Physical Chemistry Chemical Physics, 23(2), p.1343 - 1351, 2021/01
Times Cited Count:18 Percentile:80.50(Chemistry, Physical)The candidate An(III)/Ln(III) separation ligand hexa--octylnitrilo-triacetamide (HONTA) was irradiated under envisioned SELECT (Solvent Extraction from Liquid waste using Extractants of CHON-type for Transmutation) process conditions using a solvent test loop in conjunction with cobalt-60 gamma irradiation. We demonstrate that HONTA undergoes exponential decay with increasing gamma dose to produce a range of degradation products which have been identified and quantified by HPLC-ESI-MS/MS techniques. The combination of HONTA destruction and degradation product ingrowth, particularly dioctylamine, negatively impacts the extraction and back-extraction of both americium and europium ions. The loss of HONTA was attributed to its reaction with the solvent (
-dodecane) radical cation of
(HONTA + R
) = (7.61
0.82)
10
M
s
obtained by pulse radiolysis techniques. However, when this ligand is bound to either americium or europium ions, the observed
-dodecane radical cation kinetics increase by over an order of magnitude. This large reactivity increase to additional reaction pathways occurring upon metal-ion binding. Lastly nanosecond time-resolved measurements showed that both direct and indirect HONTA radiolysis yielded the short-lived (
100 ns) HONTA radical cation as well as a longer-lived (
s) HONTA triplet excited state. These HONTA species are important precursors to the suite of HONTA degradation products observed.
Gade, A.*; Basin, D.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Ettenauer, S.*; Glasmacher, T.*; Kemper, K. W.*; McDaniel, S.*; Obertelli, A.*; et al.
Physical Review C, 83(4), p.044305_1 - 044305_5, 2011/04
Times Cited Count:21 Percentile:74.87(Physics, Nuclear)no abstracts in English
Fallon, P.*; Rodriguez-Vieitez, E.*; Macchiavelli, A. O.*; Gade, A.*; Tostevin, J. A.*; Adrich, P.*; Bazin, D.*; Bowen, M.*; Campbell, C. M.*; Clark, R. M.*; et al.
Physical Review C, 81(4), p.041302_1 - 041302_5, 2010/04
Times Cited Count:41 Percentile:88.44(Physics, Nuclear)no abstracts in English
Tripathi, V.*; Tabor, S. L.*; Mantica, P. F.*; Utsuno, Yutaka; Bender, P.*; Cook, J.*; Hoffman, C. R.*; Lee, S.*; Otsuka, Takaharu*; Pereira, J.*; et al.
Physical Review Letters, 101(14), p.142504_1 - 142504_4, 2008/10
Times Cited Count:52 Percentile:86.04(Physics, Multidisciplinary)no abstracts in English
Ettenauer, S.*; Zwahlen, H.*; Adrich, P.*; Bazin, D.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; et al.
Physical Review C, 78(1), p.017302_1 - 017302_4, 2008/07
Times Cited Count:14 Percentile:64.34(Physics, Nuclear)no abstracts in English
Riley, L. A.*; Adrich, P.*; Baugher, T. R.*; Bazin, D.*; Brown, B. A.*; Cook, J. M.*; Cottle, P. D.*; Diget, C. A.*; Gade, A.*; Garland, D. A.*; et al.
Physical Review C, 78(1), p.011303_1 - 011303_5, 2008/07
Times Cited Count:25 Percentile:78.59(Physics, Nuclear)no abstracts in English
Terry, J. R.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; Hansen, P. G.*; Sherrill, B. M.*; et al.
Physical Review C, 77(1), p.014316_1 - 014316_12, 2008/01
Times Cited Count:78 Percentile:95.17(Physics, Nuclear)no abstracts in English
Tripathi, V.*; Tabor, S. L.*; Mantica, P. F.*; Utsuno, Yutaka; Bender, P.*; Cook, J. M.*; Hoffman, C. R.*; Lee, S.*; Otsuka, Takaharu*; Pereira, J.*; et al.
Physical Review C, 76(2), p.021301_1 - 021301_5, 2007/08
Times Cited Count:28 Percentile:82.87(Physics, Nuclear)no abstracts in English
Gade, A.*; Adrich, P.*; Bazin, D.*; Bowen, M. D.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Ettenauer, S.*; Glasmacher, T.*; Kemper, K. W.*; et al.
Physical Review Letters, 99(7), p.072502_1 - 072502_4, 2007/08
Times Cited Count:78 Percentile:90.29(Physics, Multidisciplinary)no abstracts in English
Atarashi-Andoh, Mariko; Schnabel, C.*; Cook, G.*; MacKenzie, A. B.*; Dougans, A.*; Ellam, R. M.*; Freeman, S.*; Maden, C.*; Olive, V.*; Synal, H.-A.*; et al.
Applied Geochemistry, 22(3), p.628 - 636, 2007/03
Times Cited Count:16 Percentile:38.31(Geochemistry & Geophysics)Accelerator Mass Spectrometry (AMS) was used to measure I/
I ratios in surface sea, lake and river water samples collected in 2004 and 2005 from the English Lake District and from South west Scotland, areas which are in relatively close proximity to the Sellafield nuclear fuel reprocessing plant in north west England. The
I/
I ratios in surface water collected from the shore of the Irish Sea were in the range 2.8
10
to 8.2
10
. These ratios are one order of magnitude higher than that of seawater collected from the Irish Sea in 1992, correlating with the increase in
I content of the Sellafield liquid effluent discharge over the last decade. The
I/
I ratios in lakes in the Lake District were in the range 0.7
10
to 6.4
10
and decreased exponentially as a function of distance from Sellafield.
Terry, J. R.*; Basin, D.*; Brown, B. A.*; Campbell, C. M.*; Church, J. A.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Enders, J.*; Gade, A.*; et al.
Physics Letters B, 640(3), p.86 - 90, 2006/09
Times Cited Count:60 Percentile:93.06(Astronomy & Astrophysics)no abstracts in English