Spectroscopic Identification of Ternary Cm−Carbonate Surface Complexes
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 loade...
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| Veröffentlicht in: | Environmental science & technology 2010-02, Vol.44 (3), p.921-927 |
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| creator | Fernandes, M. Marques Stumpf, T Baeyens, B Walther, C Bradbury, M. H |
| description | 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. |
| doi_str_mv | 10.1021/es902175w |
| format | Article |
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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. 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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.</description><subject>Adsorption</subject><subject>Alumina</subject><subject>Aluminum Oxide</subject><subject>Applied sciences</subject><subject>Atmospheric pollution</subject><subject>Carbon dioxide</subject><subject>Carbonates - chemistry</subject><subject>Chemical elements</subject><subject>Curium - chemistry</subject><subject>Environmental Processes</subject><subject>Environmental science</subject><subject>Exact sciences and technology</subject><subject>Fluorescence</subject><subject>Pollution</subject><subject>Salt</subject><subject>Spectrum Analysis</subject><subject>Surface Properties</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqF0c1q3DAQB3BREprttoe-QDGFUHJwOrIsSzoW0yQLgRyygd6MLI_AwbZcySbNG-ScR-yTRGE3u5AccprLj_n4DyFfKZxSyOhPDCoWwe8-kAXlGaRccnpAFgCUpYoVf47IpxBuASBjID-SowyAQ8GLBbm4HtFM3gXjxtYkqwaHqbWt0VPrhsTZZI1-0P4-Kfv_D4-l9rUb9ITJ9eytNpiUrh87_IfhMzm0ugv4ZVuX5Obs97q8SC-vzlflr8tU58CmtLHKNqphYKhQtbamxhoaDhQhp6KQRQ6yBo4oTI5ZoYVolERlCil1nvGaLcmPTd_Ru78zhqnq22Cw6_SAbg6VohIY54q_KwVjgnKQIsrvr-Stm-PZXahiYJSznNKITjbIxLSCR1uNvu1jNBWF6vkN1e4N0X7bNpzrHpudfMk9guMt0MHozno9mDbsXcaUEnm2d9qE_VJvBz4BQFibUA</recordid><startdate>20100201</startdate><enddate>20100201</enddate><creator>Fernandes, M. 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| subjects | Adsorption Alumina Aluminum Oxide Applied sciences Atmospheric pollution Carbon dioxide Carbonates - chemistry Chemical elements Curium - chemistry Environmental Processes Environmental science Exact sciences and technology Fluorescence Pollution Salt Spectrum Analysis Surface Properties |
| title | Spectroscopic Identification of Ternary Cm−Carbonate Surface Complexes |
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