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Parimi A, Mosher E, Schreckenbach G. Periodic trends in trivalent actinide halides, phosphates, and arsenates. Dalton Trans 2023; 52:18035-18044. [PMID: 37987618 DOI: 10.1039/d2dt02725a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Due to the limited abundance of the actinide elements, computational methods, for now, remain an exclusive avenue to investigate the periodic trends across the actinide series. As every actinide element can exhibit a +3-oxidation state, we have explored model systems of gas-phase actinide trihalides, phosphates, and arsenates across the series to capture the periodic trends. By doing so, we were able to capture the periodic trends down the halogen series as well, and for the first time we are reporting a study on actinide astatides. Using scalar and spin-orbit relativistic Density Functional Theory (DFT) calculations, we have explored the variations in bond lengths, bond angles, and the charges on actinides (An). Despite the use of different sets of ligands, the trends remain similar. The properties of trivalent Pa, U, Np, and Pu are nearly identical; similar ionic radii could be the reason. The actinide elements show a tendency to exhibit a pre-Pu and a post-Cm behaviour, with Am acting as a switch. This could be due to the change in the behaviour from d-f-type to f-filling/d-type at around Pu-Cm in the actinides as already proposed in the previous literature. Bond lengths in the AnX3 increase down the halide series, and the atomic charges decrease on the actinide elements.
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Affiliation(s)
- Ashutosh Parimi
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.
| | - Emmalee Mosher
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.
| | - Georg Schreckenbach
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.
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Wu R, Fan Y, Wu Y, Zhou S, Tang S, Feng X, Tan X, Wang J, Liu L, Jin Y, Xia C. Insights into mechanism on organic acids assisted translocation of uranium in Brassica juncea var. foliosa by EXAFS. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2020; 218:106254. [PMID: 32421586 DOI: 10.1016/j.jenvrad.2020.106254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 02/03/2020] [Accepted: 03/16/2020] [Indexed: 06/11/2023]
Abstract
Citric acid (CA) and Lactic acid (LA) were used as additives to study the mechanism of organic acid promoting the root-to-shoot translocation of uranium (U) in Brassica juncea var. foliosa from molecular and tissue levels. Firstly, the distribution of U in plants under the condition of different organic acids concentrations were studied. The accumulation of U in leafs of 1 mM CA group and 5 mM LA group reached 2225 and 1848 mg/kg respectively, which was about 5 times that of the control group. Secondly, the speciation and distribution of U in plant roots after exposure to different culture solutions were studied by EXAFS and SEM. The result of EXAFS found that the complex of U with organic acids resulted in the U accumulated in the roots was the uranyl carboxylate speciation, while the control group only was the uranyl phosphate speciation. SEM results showed that the lactic acids could enhanced the translocation of U from the cortex to the stele. Thirdly, we further studied the apoplastic pathway and the symplastic pathway of U translocation using transpiration inhibitor and metabolism inhibitor. Compared with the control group, it was likely that the complex of U with organic acids were translocated into the shoot of plants through the apoplastic pathway.
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Affiliation(s)
- Rulei Wu
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yu Fan
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yixuan Wu
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Sai Zhou
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Siqun Tang
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Xiaojie Feng
- Logistic Engineering University, Chongqing, 401311, China
| | - Xiaoli Tan
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Jianmei Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610064, China
| | - Li Liu
- College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yongdong Jin
- College of Chemistry, Sichuan University, Chengdu, 610064, China.
| | - Chuanqin Xia
- College of Chemistry, Sichuan University, Chengdu, 610064, China.
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Xie Y, Chen C, Ren X, Wang X, Wang H, Wang X. Emerging natural and tailored materials for uranium-contaminated water treatment and environmental remediation. PROGRESS IN MATERIALS SCIENCE 2019; 103:180-234. [DOI: https:/doi.org/10.1016/j.pmatsci.2019.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/25/2023]
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Song W, Wang X, Chen Z, Sheng G, Hayat T, Wang X, Sun Y. Enhanced immobilization of U(VI) on Mucor circinelloides in presence of As(V): Batch and XAFS investigation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 237:228-236. [PMID: 29486456 DOI: 10.1016/j.envpol.2018.02.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 01/16/2018] [Accepted: 02/19/2018] [Indexed: 06/08/2023]
Abstract
The combined pollution of radionuclides and heavy metals has been given rise to widespread concern during uranium mining. The influence of As(V) on U(VI) immobilization by Mucor circinelloides (M. circinelloides) was investigated using batch experiments. The activity of antioxidative enzymes and concentrations of thiol compounds and organic acid in M. circinelloides increased to respond to different U(VI) and As(V) stress. The morphological structure of M. circinelloides changed obviously under U(VI) and As(V) stress by SEM and TEM analysis. The results of XANES and EXAFS analysis showed that U(VI) was mainly reduced to nano-uraninite (nano-UO2, 30.1%) in U400, while only 9.7% of nano-UO2 was observed in the presence of As(V) in U400-As400 due to the formation of uranyl arsenate precipitate (Trögerite, 48.6%). These observations will provide the fundamental data for fungal remediation of uranium and heavy metals in uranium-contaminated soils.
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Affiliation(s)
- Wencheng Song
- Anhui Province Key Laboratory of Medical Physics Technology and Center of Medical Physics and Technology, Hefei Institutes of Physical Sciences and Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei 230031, PR China; College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Xiangxue Wang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Zhongshan Chen
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Guodong Sheng
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; College of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, PR China
| | - Tasawar Hayat
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China
| | - Xiangke Wang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China; NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Yubing Sun
- College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
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Yuan F, Cai Y, Yang S, Liu Z, Chen L, Lang Y, Wang X, Wang S. Simultaneous sequestration of uranyl and arsenate at the goethite/water interface. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5086-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Zhu Y, Elzinga EJ. Macroscopic and Spectroscopic Assessment of the Cosorption of Fe(II) with As(III) and As(V) on Al-Oxide. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13369-77. [PMID: 26505978 DOI: 10.1021/acs.est.5b04525] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The cosorption of Fe(II) with As(III) and As(V) in anoxic suspensions of γ-Al2O3 at pH 7.5 was investigated with batch kinetic experiments and synchrotron EXAFS analyses. Single-sorbate results showed that Fe(II) formed secondary Fe(II)-Al(III)-layered double hydroxide (LDH) phases during reaction with the Al-oxide sorbent, whereas As(III) and As(V) formed inner-sphere surface complexes. The kinetics and mechanisms of Fe(II) and As(III) sorption were identical in dual-sorbate and single-sorbate experiments, indicating that the processes involved operate independently. In contrast, As(V) and Fe(II) interacted strongly during cosorption. Fe(II) enhanced the rate and extent of As(V) removal from solution, but did not affect the mechanism of As(V) adsorption. Conversely, As(V) hindered the formation of Fe(II)-Al(III)-LDH, slowing down precipitation at low As(V) concentrations and preventing it at high concentrations. This was attributed to interference of adsorbed As(V) with the Al supply needed for Fe(II)-Al(III)-LDH precipitation, possibly combined with enhanced surface complexation of Fe(II) cations promoted by anionic As(V) surface species. No evidence was found for redox reactions between Fe(II) and As(V) or As(III), or for precipitation of Fe-arsenic phases. These results improve our understanding of the geochemistry of Fe(II) and arsenic in reducing environments, and demonstrate the utility of mechanistic studies on geochemically complex model systems.
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Affiliation(s)
- Ying Zhu
- Rutgers University , Department of Earth & Environmental Sciences, 101 Warren Street, Newark, New Jersey 07102, United States
| | - Evert J Elzinga
- Rutgers University , Department of Earth & Environmental Sciences, 101 Warren Street, Newark, New Jersey 07102, United States
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Hur H, Reeder RJ. Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption spectroscopy analysis. J Colloid Interface Sci 2015; 461:249-260. [PMID: 26402784 DOI: 10.1016/j.jcis.2015.09.011] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 09/01/2015] [Accepted: 09/02/2015] [Indexed: 11/24/2022]
Abstract
Mechanisms of tungstate sorption on the mineral boehmite (γ-AlOOH) were studied using batch uptake experiments and X-ray absorption spectroscopy. Batch uptake experiments over the pH range 4-8 and [W]=50-2000 μM show typical oxyanion behavior, and isotherm experiments reveal continued uptake with increasing tungstate concentration without any clear uptake maximum. Desorption experiments showed that sorption is irreversible at pH 4 and partly reversible at pH 8. Tungsten L1- and L3-edge XANES spectroscopy indicates that all sorbed tungstates are octahedrally coordinated, even though the dominant solution species at pH 8 is a tetrahedral monotungstate. Tungsten L3-edge EXAFS analysis shows that sorbed tungstate occurs as polymeric form(s), as indicated by the presence of corner- and edge-sharing of distorted tungstate octahedra. The occurrence of polymeric tungstate on the surface at pH 8 indicates that sorption is accompanied by polymerization and a coordination change from tetrahedral (in solution) to distorted octahedral (on the surface). The strong tendency for tungstate polymerization on boehmite can explain the continued uptake without an apparent maximum in sorption, and the limited desorption behavior. Our results provide the basis for a predictive model of tungstate uptake by boehmite, which can be important for understanding tungstate mobility, toxicity, and bioavailability.
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Affiliation(s)
- Hyuck Hur
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA
| | - Richard J Reeder
- Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA.
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Zhang H, Liu Q, Wang J, Liu J, Yan H, Jing X, Zhang B. Preparation of magnetic calcium silicate hydrate for the efficient removal of uranium from aqueous systems. RSC Adv 2015. [DOI: 10.1039/c4ra08678c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Preparation of a magnetic adsorbent for uranium with rapidly and effectively adsorption characteristics via sonochemical and in situ growth method.
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Affiliation(s)
- Hongsen Zhang
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
- College of Environmental and Chemical Engineering
| | - Qi Liu
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
| | - Jun Wang
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
- College of Material Science and Chemical Engineering
| | - Jingyuan Liu
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
| | - Huijun Yan
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
| | - Xiaoyan Jing
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
| | - Bin Zhang
- Key Laboratory of Superlight Material and Surface Technology
- Ministry of Education
- Harbin Engineering University
- P. R. China
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Troyer LD, Tang Y, Borch T. Simultaneous reduction of arsenic(V) and uranium(VI) by mackinawite: role of uranyl arsenate precipitate formation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:14326-14334. [PMID: 25383895 DOI: 10.1021/es5037496] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Uranium (U) and arsenic (As) often occur together naturally and, as a result, can be co-contaminants at sites of uranium mining and processing, yet few studies have examined the simultaneous redox dynamics of U and As. This study examines the influence of arsenate (As(V)) on the reduction of uranyl (U(VI)) by the redox-active mineral mackinawite (FeS). As(V) was added to systems containing 47 or 470 μM U(VI) at concentrations ranging from 0 to 640 μM. In the absence of As(V), U was completely removed from solution and fully reduced to nano-uraninite (nano-UO2). While the addition of As(V) did not reduce U uptake, at As(V) concentrations above 320 μM, the reduction of U(VI) was limited due to the formation of a trögerite-like uranyl arsenate precipitate. The presence of U also significantly inhibited As(V) reduction. While less U(VI) reduction to nano-UO2 may take place in systems with high As(V) concentrations, formation of trögerite-like mineral phases may be an acceptable reclamation end point due to their high stability under oxic conditions.
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Affiliation(s)
- Lyndsay D Troyer
- Department of Chemistry, Colorado State University , 1872 Campus Delivery, Fort Collins, Colorado 80523, United States
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Affiliation(s)
- Kate Maher
- Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States
| | | | - Gordon E. Brown
- Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States
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Gezahegne WA, Hennig C, Tsushima S, Planer-Friedrich B, Scheinost AC, Merkel BJ. EXAFS and DFT investigations of uranyl arsenate complexes in aqueous solution. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:2228-2233. [PMID: 22229913 DOI: 10.1021/es203284s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Uranium and arsenic often co-occur in nature, for example, in acid mine drainage waters. Interaction with arsenic is thus important to understand uranium mobility in aqueous solutions. For the present study, EXAFS spectroscopy was used to investigate the formation and identify the structure of aqueous uranyl arsenate species at pH 2. The nearest U-As distance of 3.39 Å, observed in shock-frozen liquid samples, was significantly shorter than that observed in solid uranyl arsenate minerals. The shorter bond length indicated that the solution contained a bidentate-coordinated species, in contrast to the monodentate coordination in solid uranyl arsenate minerals. The U-As coordination number of 1.6 implied that two uranyl arsenate species with U:As ratios of 1:1 and 1:2 formed in nearly equal proportions and that the hydrated uranyl ion was present only as a minor component. The two uranyl arsenate species could not be differentiated spectroscopically, since their U-As distances were equal. A comparison based on DFT modeling indicated for both the 1:1 and the 1:2 species, that the bidentate arsenates were bound to uranium with one of the binding oxygen atoms being protonated. Based on the present spectroscopic study, the two species that will have to be considered in acidic uranium-arsenic-rich solutions are thus UO(2)H(2)AsO(4)(+), and UO(2)(H(2)AsO(4))(2)(0).
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Guan X, Dong H, Ma J, Lo IM, Dou X. Performance and mechanism of simultaneous removal of chromium and arsenate by Fe(II) from contaminated groundwater. Sep Purif Technol 2011. [DOI: 10.1016/j.seppur.2011.04.034] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Del Nero M, Galindo C, Barillon R, Madé B. TRLFS evidence for precipitation of uranyl phosphate on the surface of alumina: environmental implications. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:3982-3988. [PMID: 21469705 DOI: 10.1021/es2000479] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We studied the ligand-enhanced sorption of uranyl ions (1-12 μM) on α-alumina colloids suspended in (and pre-equilibrated with) solutions at various concentrations of phosphate ions (P(T) = 0-900 μM). A highly sensitive technique, time resolved laser-induced fluorescence spectroscopy (TRLFS), was used to examine the chemical speciation of uranyl sorbed at trace concentrations (0.4-4 μmol U·g⁻¹). The suspensions with P(T) ≥ 100 μM exhibited high uranyl adsorption, and a very high intensity of fluorescence that increased with the sorbed amounts of phosphate and uranyl. These samples exhibited similar spectral and temporal characteristics of fluorescence emission, evidencing a uniform speciation pattern and a single coordination environment for sorbed U, despite large variation in parameters such as aqueous uranyl speciation, U loading, and extent of coverage of alumina by secondary Al phosphates precipitating on the surface. The results pointed formation of surface precipitates of uranyl phosphates, which are characterized by high quantum yield, peak maxima at positions similar to those of U(VI) phosphate minerals and four lifetimes indicating distortions, in-homogeneities or varying number of water molecules in the lattice. The findings have major implications for our understanding of the mechanisms of immobilization of U at trace levels on surfaces of oxides submitted to phosphated solutions in soils with low pH.
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Affiliation(s)
- Mirella Del Nero
- Institut Pluridisciplinaire Hubert Curien, UMR 7178 CNRS/UdS, Strasbourg Cedex 2, France.
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Tang Y, Reeder RJ. Enhanced uranium sorption on aluminum oxide pretreated with arsenate. Part I: Batch uptake behavior. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:4446-4451. [PMID: 19603660 DOI: 10.1021/es802369m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We explored mechanisms for increasing U(VI) sorption by pretreating alumina surfaces with arsenate, which has a high affinity for binding with uranyl and is an analog for phosphate. Batch experiments were conducted at pH approximately 4 by pretreating a gamma-alumina surface with arsenate, followed by the addition of uranyl. Parallel experiments were conducted with different alumina loadings as well as As and U concentrations. Results show positive correlations between U(VI) uptake and [As]ini/[U]ini (ratio between the initial As solution concentration for pretreatment and the initial U solution concentration), suggesting the formation of ternary surface complexes and/or precipitates. Desorption experiments show partial irreversibility of the adsorbed U, suggesting less likelihood of remobilization. The pretreatment process results in enhanced U uptake and enhanced stability of the sorbed U, and provides a basis for designing other treatment processes for selective remediation applications.
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Affiliation(s)
- Yuanzhi Tang
- Department of Geosciences and Center for Environmental Molecular Science, State University of New York, Stony Brook, New York 11794-2100, USA.
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