Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions
Evaluation of the mobility behaviour of radionuclides under highly saline and alkaline conditions is a major concern for the performance assessment of radioactive waste disposal. The aim of this study was to determine the effect of up to 2.8 mol/kg<sub>solution</sub> content of NaNO<s...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/3/325 |
| _version_ | 1797609970509807616 |
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| author | Nathalie Macé Jacques Page Pascal E. Reiller |
| author_facet | Nathalie Macé Jacques Page Pascal E. Reiller |
| author_sort | Nathalie Macé |
| collection | DOAJ |
| description | Evaluation of the mobility behaviour of radionuclides under highly saline and alkaline conditions is a major concern for the performance assessment of radioactive waste disposal. The aim of this study was to determine the effect of up to 2.8 mol/kg<sub>solution</sub> content of NaNO<sub>3</sub>, on the solubility and the retention of U(VI) at 22 °C onto a hardened cement paste (HCP) prepared from ordinary Portland cement (CEM I). To avoid the interference of the high salt concentration and ionic strength, and because of the expected low solubility of uranium under such alkaline conditions, time-resolved laser fluorescence spectroscopy (TRLFS) was selected to accurately measure U(VI) concentration in solution using the standard addition method in 85% H<sub>3</sub>PO<sub>4</sub>. This allows both limiting the dilution and matrix effects and determining the resulting [U(VI)] in solution with acceptable precision for the distribution factor (R<sub>d</sub>) in both sorption and desorption experiments. The operational solubility limit measured at high ionic strength lowered by a factor of three compared to the reference cementitious condition, and its R<sub>d</sub> values decreased by a factor ca. four. The sorption of U(VI) appears to be reversible under these conditions. |
| first_indexed | 2024-03-11T06:08:54Z |
| format | Article |
| id | doaj.art-0021e563baa24d55a05358a9a2b757f4 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T06:08:54Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-0021e563baa24d55a05358a9a2b757f42023-11-17T12:47:02ZengMDPI AGMinerals2075-163X2023-02-0113332510.3390/min13030325Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline ConditionsNathalie Macé0Jacques Page1Pascal E. Reiller2Université Paris-Saclay, CEA, Service de Physico-Chimie, 91191 Gif-sur-Yvette, FranceUniversité Paris-Saclay, CEA, Service de Physico-Chimie, 91191 Gif-sur-Yvette, FranceUniversité Paris-Saclay, CEA, Service de Physico-Chimie, 91191 Gif-sur-Yvette, FranceEvaluation of the mobility behaviour of radionuclides under highly saline and alkaline conditions is a major concern for the performance assessment of radioactive waste disposal. The aim of this study was to determine the effect of up to 2.8 mol/kg<sub>solution</sub> content of NaNO<sub>3</sub>, on the solubility and the retention of U(VI) at 22 °C onto a hardened cement paste (HCP) prepared from ordinary Portland cement (CEM I). To avoid the interference of the high salt concentration and ionic strength, and because of the expected low solubility of uranium under such alkaline conditions, time-resolved laser fluorescence spectroscopy (TRLFS) was selected to accurately measure U(VI) concentration in solution using the standard addition method in 85% H<sub>3</sub>PO<sub>4</sub>. This allows both limiting the dilution and matrix effects and determining the resulting [U(VI)] in solution with acceptable precision for the distribution factor (R<sub>d</sub>) in both sorption and desorption experiments. The operational solubility limit measured at high ionic strength lowered by a factor of three compared to the reference cementitious condition, and its R<sub>d</sub> values decreased by a factor ca. four. The sorption of U(VI) appears to be reversible under these conditions.https://www.mdpi.com/2075-163X/13/3/325radionuclideuranylcementitious mediasaline plumeNaNO<sub>3</sub>luminescence |
| spellingShingle | Nathalie Macé Jacques Page Pascal E. Reiller Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions Minerals radionuclide uranyl cementitious media saline plume NaNO<sub>3</sub> luminescence |
| title | Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions |
| title_full | Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions |
| title_fullStr | Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions |
| title_full_unstemmed | Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions |
| title_short | Uranium(VI) Sorption onto Hardened Cement Paste under High Saline and Alkaline Conditions |
| title_sort | uranium vi sorption onto hardened cement paste under high saline and alkaline conditions |
| topic | radionuclide uranyl cementitious media saline plume NaNO<sub>3</sub> luminescence |
| url | https://www.mdpi.com/2075-163X/13/3/325 |
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