Details
| Original language | English |
|---|---|
| Pages (from-to) | 921-927 |
| Number of pages | 7 |
| Journal | Environmental Science and Technology |
| Volume | 44 |
| Issue number | 3 |
| Publication status | Published - 5 Jan 2010 |
| Externally published | Yes |
Abstract
The influence of dissolved CO2 on the sorption of trivalent curium (Cm) on alumina (γ-Al2O3) and kaolinite was investigated by time resolved laser fluorescence spectroscopy (TRLFS) using the optical properties of Cm as a local luminescent probe. Measurements were performed at T < 20 K on Cm loaded γ-Al2O3 and kaolinite wet pastes prepared in the absence and presence of carbonate in order to pictorially illustrate any changes through a direct comparison of spectra from both systems. The red-shift of excitation and emission spectra, as well as the increase of fluorescence lifetimes observed in the samples with carbonate, clearly showed the influence of carbonate and was fully consistent with the formation of Cm(III) surface species involving carbonate complexes. In addition, the biexponential decay behavior of the fluorescence lifetime indicated that at least two different Cm(III) - carbonate species exist at the mineral - water interface. These results provide the first spectroscopic evidence for the formation of ternary Cm(III) - carbonate surface complexes.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Environmental Science(all)
- Environmental Chemistry
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In: Environmental Science and Technology, Vol. 44, No. 3, 05.01.2010, p. 921-927.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spectroscopic identification of ternary Cm - Carbonate surface complexes
AU - Marques Fernandes, M.
AU - Stumpf, Thorsten
AU - Baeyens, B.
AU - Walther, Clemens
AU - Bradbury, M. H.
PY - 2010/1/5
Y1 - 2010/1/5
N2 - The influence of dissolved CO2 on the sorption of trivalent curium (Cm) on alumina (γ-Al2O3) and kaolinite was investigated by time resolved laser fluorescence spectroscopy (TRLFS) using the optical properties of Cm as a local luminescent probe. Measurements were performed at T < 20 K on Cm loaded γ-Al2O3 and kaolinite wet pastes prepared in the absence and presence of carbonate in order to pictorially illustrate any changes through a direct comparison of spectra from both systems. The red-shift of excitation and emission spectra, as well as the increase of fluorescence lifetimes observed in the samples with carbonate, clearly showed the influence of carbonate and was fully consistent with the formation of Cm(III) surface species involving carbonate complexes. In addition, the biexponential decay behavior of the fluorescence lifetime indicated that at least two different Cm(III) - carbonate species exist at the mineral - water interface. These results provide the first spectroscopic evidence for the formation of ternary Cm(III) - carbonate surface complexes.
AB - The influence of dissolved CO2 on the sorption of trivalent curium (Cm) on alumina (γ-Al2O3) and kaolinite was investigated by time resolved laser fluorescence spectroscopy (TRLFS) using the optical properties of Cm as a local luminescent probe. Measurements were performed at T < 20 K on Cm loaded γ-Al2O3 and kaolinite wet pastes prepared in the absence and presence of carbonate in order to pictorially illustrate any changes through a direct comparison of spectra from both systems. The red-shift of excitation and emission spectra, as well as the increase of fluorescence lifetimes observed in the samples with carbonate, clearly showed the influence of carbonate and was fully consistent with the formation of Cm(III) surface species involving carbonate complexes. In addition, the biexponential decay behavior of the fluorescence lifetime indicated that at least two different Cm(III) - carbonate species exist at the mineral - water interface. These results provide the first spectroscopic evidence for the formation of ternary Cm(III) - carbonate surface complexes.
UR - http://www.scopus.com/inward/record.url?scp=75749140941&partnerID=8YFLogxK
U2 - 10.1021/es902175w
DO - 10.1021/es902175w
M3 - Article
C2 - 20050656
AN - SCOPUS:75749140941
VL - 44
SP - 921
EP - 927
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 3
ER -