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Lopez-Odriozola L, Shaw S, Abrahamsen-Mills L, Waters C, Natrajan LS. Identification and Quantification of Multiphase U(VI) Speciation on Gibbsite with pH Using TRLFS and PARAFAC of Excitation Emission Matrices. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:17916-17925. [PMID: 39315992 PMCID: PMC11466309 DOI: 10.1021/acs.est.4c06133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Revised: 09/16/2024] [Accepted: 09/17/2024] [Indexed: 09/25/2024]
Abstract
The significant abundance of uranium in radioactive waste inventories worldwide necessitates a thorough understanding of its behavior. In this work, the speciation of uranyl(VI), (UO22+) in a gibbsite system under ambient conditions has been determined as a function of pH by deconvolution and analysis of luminescence spectroscopic data. Uniquely, a combined experimental and statistical approach utilizing time-resolved luminescence spectroscopy and parallel factor analysis (PARAFAC) of excitation emission matrices has been successfully utilized to identify four separate luminescent U(VI) species in the uranyl-gibbsite system for the first time. The speciation of all luminescent U(VI) species in an environmentally relevant system over a pH range of 6-11 is discerned through the analysis of emission fingerprints at low temperature (20 K). Comparison of the deconvoluted luminescence spectra with mineral standards and geochemical models of the system allows the assignment of the luminescent chemical species as metaschoepite, Na-compreignacite, surface adsorbed ≡AlO2-UO2(OH) and ≡AlO2-UO2(CO3)24- complexes, with assignments supported by fitting of extended X-ray absorption fine structure data. The combined spectroscopic techniques in this study show that assignment and quantification of uranyl(VI) species in a sorption system over a large pH range can be accurately achieved using PARAFAC to deconvolute a three way emission spectroscopic data set.
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Affiliation(s)
- Laura Lopez-Odriozola
- Centre
for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K.
| | - Samuel Shaw
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, U.K.
| | | | - Charlotte Waters
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, U.K.
| | - Louise S. Natrajan
- Centre
for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K.
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2
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Cha W, Park TH, Park JH. Progress of energy-related radiochemistry and radionuclide production in the Republic of Korea. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The field of radiochemistry in the Republic of Korea has expanded greatly over the last three decades to meet the rapid growth of technological demands in various areas such as nuclear energy and nuclear technologies for human health and environmental protection. Major research activities, which were initially centered at the Korea Atomic Energy Research Institute (KAERI), have gradually spread to major universities and the commercial sector. In this review, progress and recent research trends in nuclear and radiochemistry in Korea are summarized. The main research outcomes achieved by KAERI scientists are highlighted, with emphasis on basic actinide chemistry in nuclear fuel cycles, the radioanalytical chemistry of various radionuclides from radioactive waste and the environment, and medical radionuclide production. In addition, recent efforts to promote radiochemical education and future perspectives are briefly outlined.
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Affiliation(s)
- Wansik Cha
- Nuclear Chemistry Research Laboratory , Korea Atomic Energy Research Institute , 989-111 Daedeok-daero, Yuseong-gu , Daejeon 34057 , Republic of Korea
| | - Tae-Hong Park
- Radioactive Waste Chemical Analysis Center , Korea Atomic Energy Research Institute , 989-111 Daedeok-daero, Yuseong-gu , Daejeon 34057 , Republic of Korea
| | - Jeong Hoon Park
- Accelerator Radioisotope Development Laboratory , Korea Atomic Energy Research Institute , 989-111 Daedeok-daero, Yuseong-gu , Daejeon 34057 , Republic of Korea
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3
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Kim HK, Lee DW, Park S, Chang Jung E, Lim SH, Cha W, Cho HR. Structural and spectroscopic studies of spontaneously formed crystalline Eu(iii)-aliphatic dicarboxylates at room temperature. RSC Adv 2022; 12:4047-4053. [PMID: 35425458 PMCID: PMC8981011 DOI: 10.1039/d1ra07565a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 01/20/2022] [Indexed: 11/28/2022] Open
Abstract
Complexation of actinides and lanthanides with carboxylic organic ligands is a critical issue affecting radionuclide migration from deep geological disposal systems of spent nuclear fuel. A series of Eu(iii)-aliphatic dicarboxylate compounds, as chemical analogs of radioactive Am(iii) species, Eu2(Ox)3(H2O)6, Eu2(Mal)3(H2O)6, and Eu2(Suc)3(H2O)2, were synthesized and characterized using X-ray crystallography and time-resolved laser fluorescence spectroscopy to examine the ligand-dependent binding modes and the corresponding changes in spectroscopic properties. Powder X-ray crystallography results confirmed that all of the compounds presented a crystalline polymer structure with a trigonal prism square-face tricapped polyhedron geometry centered on Eu(iii) in a nine-coordinate environment involving nine oxygen atoms. This study captures the transition of the coordination modes of aliphatic dicarboxylate ligands from side-on to end-on binding as the carbon chain length increases. This transition is illustrated in malonate bindings involving a combination of side-on and end-on modes. Strongly enhanced luminescence, especially for the hypersensitive peak, indicates a low site symmetry in the formation of solid compounds. The number of remaining bound water molecules was estimated from the resultant increased luminescence lifetimes, which were in good agreement with crystal structures. The excitation-emission matrix spectra of these crystalline polymers suggest that Ox ligands promote the sensitized luminescence of Eu(iii), especially in the UV region. In the case of Mal and Suc ligands, charge transfer occurs in the opposite direction from Eu(iii) to the ligands under UV excitation, resulting in weaker luminescence.
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Affiliation(s)
- Hee-Kyung Kim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Dong Woo Lee
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Sojeong Park
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Euo Chang Jung
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Sang Ho Lim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Wansik Cha
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
| | - Hye-Ryun Cho
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute Daejeon 34057 Republic of Korea
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4
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Behera N, Sethi S. Unprecedented Catalytic Behavior of Uranyl(VI) Compounds in Chemical Reactions. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Nabakrushna Behera
- School of Chemistry Sambalpur University Jyoti Vihar – 768019 Sambalpur Odisha India
| | - Sipun Sethi
- School of Chemistry Sambalpur University Jyoti Vihar – 768019 Sambalpur Odisha India
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5
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Long-term mobility of uranium in the granitic KURT site using isotopic analysis and sequential chemical extraction. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07380-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Oher H, Vercouter T, Réal F, Shang C, Reiller PE, Vallet V. Influence of Alkaline Earth Metal Ions on Structures and Luminescent Properties of Na mM nUO 2(CO 3) 3(4-m-2n)- (M = Mg, Ca; m, n = 0-2): Time-Resolved Fluorescence Spectroscopy and Ab Initio Studies. Inorg Chem 2020; 59:15036-15049. [PMID: 33000939 DOI: 10.1021/acs.inorgchem.0c01986] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The luminescence spectra of triscarbonatouranyl complexes were determined by experimental and theoretical methods. Time-resolved laser-induced fluorescence spectroscopy was used to monitor spectra of uranyl and bicarbonate solutions at 0.1 mol kgw-1 ionic strength and pH ca. 8. The concentrations of Mg2+ and Ca2+ in the samples were chosen in order to vary the proportions of the alkaline earth ternary uranyl complexes MgUO2(CO3)32-, CaUO2(CO3)32-, and Ca2UO2(CO3)3. The luminescence spectrum of each complex was determined by decomposition in order to compare it with the simulated spectra of model structures NamMnUO2(CO3)3(4-m-2n)- (M = Mg, Ca; m, n = 0-2) obtained by quantum chemical methods. The density functional theory (DFT) and time-dependent (TD)-DFT methods were used with the PBE0 functional to optimize the structures in the ground and excited states, respectively, including relativistic effects at the spin-free level, and water solvent effects using a continuum polarizable conductor model. The changes in the structural parameters were quantified with respect to the nature and the amount of alkaline earth counterions to explain the luminescence spectra behavior. The first low-lying excited state was successfully computed, together with the vibrational harmonic frequencies. The DFT calculations confirmed that uranyl luminescence originates from electronic transitions from one of the four nonbonding 5f orbitals of uranium to an orbital that has a uranyl-σ (5f, 6d) character mixed with the 2p atomic orbitals of the carbonate oxygens. Additional single-point calculations using the more accurate TD-DFT/CAM-B3LYP allow one to determine the position of the luminescence "hot band" for each structure in the range 467-476 nm and compared fairly well with experimental reports at around 465 nm. The complete luminescence spectra were built from theoretical results with the corresponding assignment of the electronic transitions and vibronic modes involved, mainly the U-Oax stretching mode. The resulting calculated spectra showed a very good agreement with experimental band positions and band spacing attributed to MgUO2(CO3)32-, CaUO2(CO3)32-, and Ca2UO2(CO3)3. The evolution of luminescence intensities with the number of alkaline earth metal ions in the structure was also correctly reproduced.
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Affiliation(s)
- Hanna Oher
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France.,UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
| | - Thomas Vercouter
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Florent Réal
- UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
| | - Chengming Shang
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Pascal E Reiller
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Valérie Vallet
- UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
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7
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Shang C, Reiller PE. Determination of formation constants and specific ion interaction coefficients for CanUO2(CO3)3(4−2n)− complexes in NaCl solution by time-resolved laser-induced luminescence spectroscopy. Dalton Trans 2020; 49:466-481. [DOI: 10.1039/c9dt03543e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The formation constants of CaUO2(CO3)32− and Ca2UO2(CO3)3(aq) were determined in NaCl medium at ionic strengths between 0.1 and 1 mol kgw−1 using time-resolved laser-induced luminescence spectroscopy (TRLS).
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Affiliation(s)
- Chengming Shang
- Den – Service d’Études Analytiques et de Réactivité des Surfaces (SEARS)
- CEA
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette CEDEX
- France
| | - Pascal E. Reiller
- Den – Service d’Études Analytiques et de Réactivité des Surfaces (SEARS)
- CEA
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette CEDEX
- France
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8
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Jo Y, Kim HK, Yun JI. Complexation of UO 2(CO 3) 34- with Mg 2+ at varying temperatures and its effect on U(vi) speciation in groundwater and seawater. Dalton Trans 2019; 48:14769-14776. [PMID: 31549713 DOI: 10.1039/c9dt03313k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ternary alkaline earth metal uranyl tricarbonate complexes, MnUO2(CO3)32n-4 (M = Mg and Ca), have been considered to be the major U(vi) species contributing to uranium mobility in natural water. Although MgUO2(CO3)32- can account for a substantial portion of U(vi) in a Mg2+-rich aqueous system and most processes regarding uranium are subjected to variable temperatures, chemical thermodynamic data for the prediction of the formation of MgUO2(CO3)32- at variable temperatures are still unknown. To fill the knowledge gap in the current chemical thermodynamic database, ultraviolet/visible (UV/Vis) absorption spectroscopy was employed to determine the formation constants (log K') of MgUO2(CO3)32- at varying temperatures of 10-85 °C in 0.5 mol kg-1 NaCl. The formation constants at infinite dilution, log K°, were obtained with specific ion interaction theory (SIT), and an increasing tendency of log K° with temperature was observed. Using calorimetric titration, the endothermic molar enthalpy of reaction (ΔrHm) of Mg2+ complexation with UO2(CO3)34- was determined at 25 °C. According to the chemical thermodynamic data obtained in this work, approximation models for the prediction of the temperature-dependent formation constant at a given temperature were examined and the constant enthalpy approximation with modification to the isoelectric reaction showed a satisfactory agreement with our experimental results. Finally, the effects of temperature on U(vi) speciation in Mg2+-rich groundwater and U(vi) extraction from seawater by amidoxime derivatives were examined. For the first time, this work provides important chemical thermodynamic data of MgUO2(CO3)32n-4 to assess the impact of temperature on U(vi) behaviour in groundwater and seawater.
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Affiliation(s)
- Yongheum Jo
- Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
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9
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Kim HK, Jeong K, Cho HR, Jung EC, Kwak K, Cha W. Spectroscopic speciation of aqueous Am(iii)–oxalate complexes. Dalton Trans 2019; 48:10023-10032. [DOI: 10.1039/c9dt01087d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Speciation, thermodynamic stability, and structural information of aqueous oxalato-Am(iii) complexes were resolved by combinatorial use of UV-Vis-LWCC, TRLFS, and DFT calculations.
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Affiliation(s)
- H.-K. Kim
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - K. Jeong
- Department of Chemistry
- Nuclear and WMD Protection Research Center
- Korea Military Academy
- Seoul 01805
- Republic of Korea
| | - H.-R. Cho
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - E. C. Jung
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - K. Kwak
- Center for Molecular Spectroscopy and Dynamics
- Institute for Basic Science (IBS)
- Seoul 02841
- Republic of Korea
- Department of Chemistry
| | - W. Cha
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
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10
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Jo Y, Kirishima A, Kimuro S, Kim HK, Yun JI. Formation of CaUO2(CO3)32− and Ca2UO2(CO3)3(aq) complexes at variable temperatures (10–70 °C). Dalton Trans 2019; 48:6942-6950. [DOI: 10.1039/c9dt01174a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ternary complexation of calcium uranyl tricarbonate species, CaUO2(CO3)32− and Ca2UO2(CO3)3(aq), which are the predominant U(vi) complexes in groundwater and seawater, was investigated at variable temperatures from 10 to 70 °C.
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Affiliation(s)
- Yongheum Jo
- Department of Nuclear and Quantum Engineering
- Daejeon 34141
- Republic of Korea
| | - Akira Kirishima
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai
- Japan
| | - Shingo Kimuro
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai
- Japan
| | - Hee-Kyung Kim
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - Jong-Il Yun
- Department of Nuclear and Quantum Engineering
- Daejeon 34141
- Republic of Korea
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11
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He W, Ma J, Qian J, Liu H, Hua D. Adsorption-assistant detection of trace uranyl ion with high sensitivity and selectivity in the presence of SBA-15. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-5749-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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12
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Takao K, Tsushima S. The oxidation of borohydrides by photoexcited [UO2(CO3)3]4−. Dalton Trans 2018; 47:5149-5152. [DOI: 10.1039/c8dt00559a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemistry of [UVIO2(CO3)3]4− has not been well-explored because of its barely luminescent nature. Herein, we have demonstrated the oxidation of borohydrides by photoexcited [UVIO2(CO3)3]4−.
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Affiliation(s)
- Koichiro Takao
- Laboratory for Advanced Nuclear Energy
- Institute of Innovative Research
- Tokyo Institute of Technology
- 152-8550 Tokyo
- Japan
| | - Satoru Tsushima
- Tokyo Tech World Research Hub Initiative (WRHI)
- Institute of Innovative Research
- Tokyo Institute of Technology
- Japan
- Institute of Resource Ecology
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13
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Formation, stability and structural characterization of ternary MgUO2(CO3)3
2− and Mg2UO2(CO3)3(aq) complexes. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2643] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The formation of ternary Mg-UO2-CO3 complexes under weakly alkaline pH conditions was investigated by time-resolved laser fluorescence spectroscopy (TRLFS) and extended X-ray absorption fine structure (EXAFS) and compared to Ca-UO2-CO3 complexes. The presence of two different Mg-UO2-CO3 complexes was identified by means of two distinct fluorescence lifetimes of 17±2 ns and 51±2 ns derived from the multi-exponential decay of the fluorescence signal. Slope analysis in terms of fluorescence intensity coupled with fluorescence intensity factor as a function of log [Mg(II)] was conducted for the identification of the Mg-UO2-CO3 complexes forming. For the first time, the formation of both MgUO2(CO3)3
2− and Mg2UO2(CO3)3(aq) species was confirmed and the corresponding equilibrium constants were determined as log β0
113=25.8±0.3 and log β0
213=27.1±0.6, respectively. Complementarily, fundamental structural information for both Ca-UO2-CO3 and Mg-UO2-CO3 complexes was gained by extended EXAFS revealing very similar structures between these two species, except for the clearly shorter U-Mg distance (3.83 Å) compared with U-Ca distance (4.15 Å). These results confirmed the inner-sphere character of the Ca/Mg-UO2-CO3 complexes. The formation constants determined for MgUO2(CO3)3
2− and Mg2UO2(CO3)3(aq) species indicate that ternary Mg-UO2-CO3 complexes contribute to the relevant uranium species in carbonate saturated solutions under neutral to weakly alkaline pH conditions in the presence of Mg(II) ions, which will induce notable influences on the U(VI) chemical species under seawater conditions.
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