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Pethes I. Towards the correct microscopic structure of aqueous CsCl solutions with a comparison of classical interatomic potential models. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Bioremediation potential of hexavalent chromium-resistant Arthrobacter globiformis 151B: study of the uptake of cesium and other alkali ions. INTERNATIONAL MICROBIOLOGY : THE OFFICIAL JOURNAL OF THE SPANISH SOCIETY FOR MICROBIOLOGY 2022; 25:745-758. [PMID: 35768673 DOI: 10.1007/s10123-022-00258-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 05/04/2022] [Accepted: 06/07/2022] [Indexed: 10/17/2022]
Abstract
Cesium (Cs+) enters environments largely because of global release into the environment from weapons testing and accidents such as Fukushima Daiichi and Chernobyl nuclear waste. Even at low concentrations, Cs+ is highly toxic to ecological receptors because of its physicochemical similarity to macronutrient potassium (K+). We investigated the uptake and accumulation of Cs+ by Arthrobacter globiformis strain 151B in reference to three similar alkali metal cations rubidium (Rb+), sodium (Na+), and potassium (K+). The impact of hexavalent chromium (Cr+6) as a co-contaminant was also evaluated. A. globiformis 151B accumulated Cs+ and Cr6+ in a time-dependent fashion. In contrast, the uptake and accumulation of Rb+ did not exhibit any trends. An exposure to Cs+, Rb+, and Cr+6 triggered a drastic increase in K+ and Na+ uptake by the bacterial cells. That was followed by the efflux of K+ and Na+, suggesting a Cs+ "substitution." Two-dimensional gel-electrophoresis of bacterial cell proteomes with the following mass-spectrometry of differentially expressed bands revealed that incubation of bacterial cells with Cs+ induced changes in the expression of proteins involved in the maintenance of cellular homeostasis and reactive oxygen species removal. The ability of A. globiformis 151B to mediate the uptake and accumulation of cesium and hexavalent chromium suggests that it possesses wide-range bioremediation potential.
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3
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Reynolds JG. A method to apply Zavitsas' aqueous electrolyte model to multicomponent solutions and its equivalence to Zdanovskii's rule. AIChE J 2021. [DOI: 10.1002/aic.17487] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Nair AS, Bagchi B. Rigid Cations Induce Enhancement of Microheterogeneity and Exhibit Anomalous Ion Diffusion in Water-Ethanol Mixtures. J Phys Chem B 2021; 125:12274-12291. [PMID: 34726411 DOI: 10.1021/acs.jpcb.1c07698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Because of the amphiphilic nature of ethanol in the aqueous solution, ions cause an interesting microheterogeneity where the water molecules and the hydroxy groups of ethanol preferentially solvate the ions, while the ethyl groups tend to occupy the intervening space. Using computer simulations, we study the dynamics of rigid monovalent cations (Li+, Na+, K+, and Cs+) in aqueous ethanol solutions with chloride as the counterion. We vary both the size of the ions and the composition of the mixture to explore size- and composition-dependent ion diffusion. The relative stability of enhanced microheterogeneous configurations makes ion diffusion slower than what would be surmised by using the bulk properties of the mixture, using the Stokes-Einstein relation. We study the structure through partial radial distribution functions and the stability through coordination number fluctuations. The ion diffusion coefficient exhibits sharp re-entrant behavior when plotted against viscosity varied by composition. Our studies reveal multiple anomalous features of ion motion in this mixture. We formulate a mode-coupling theory (MCT) that takes into account the interaction between different dynamical components; MCT can incorporate the effects of heterogeneous dynamics and nonlinearity in composition dependence that arise from the feedback between mutually dependent ion-solvent dynamics.
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Affiliation(s)
- Anjali S Nair
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Biman Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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Reynolds JG. Solubilities in aqueous nitrate solutions that appear to reverse the law of mass action. Phys Chem Chem Phys 2021; 23:21407-21418. [PMID: 34553199 DOI: 10.1039/d1cp03124d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-ideal aqueous electrolyte solutions have been studied since the start of the application of thermodynamics to chemistry in the late 19th century. The present study examines some of the most extreme non-ideal behavior ever observed: solubilities of alkali and NH4+ nitrate salts in water that appear to behave the opposite of how the Law of Mass Action would predict. A literature review discovered that the solubilities of NH4NO3 and many alkali nitrate salts increases when another nitrate-bearing electrolyte is added to solution. These occurrences were in concentrated solutions with insufficient water to provide all ions their preferred hydration number without sharing waters between ions. This water deficit results in the formation of contact ion-pairs as well as larger ion-clusters. These ion-clusters may be favored when there is more than one type of monovalent cation present.
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Affiliation(s)
- Jacob G Reynolds
- Washington River Protection Solutions, LLC, P. O. Box 850, Richland, WA, 99352, USA.
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6
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Kai MF, Zhang LW, Liew KM. Atomistic insights into structure evolution and mechanical property of calcium silicate hydrates influenced by nuclear waste caesium. JOURNAL OF HAZARDOUS MATERIALS 2021; 411:125033. [PMID: 33454570 DOI: 10.1016/j.jhazmat.2020.125033] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 12/24/2020] [Accepted: 12/29/2020] [Indexed: 06/12/2023]
Abstract
The fundamental mechanisms underlying the influence of nuclear wastes on concrete properties remain poorly understood, especially at the molecular level. Herein, caesium ions (Cs+) are introduced into calcium silicate hydrates (CSH) to investigate its effect using molecular dynamics simulation. Structurally, a swelling phenomenon is observed, attributed to the CSH interlayer expansion as Cs+ occupies larger space than Ca2+. The diffusion of interlayer water, Ca2+ and Cs+, following an order of water > Cs+ > Ca2+, is accelerated with increasing Cs+ content, owing to three mechanisms: expanded interlayer space, weakened interfacial interaction, and loss of chemical bond stability. Mechanically, the Young's modulus and strength of CSH are degraded by Cs+ due to two mechanisms: (1) the load transfer ability of interlayer water and Ca2+ is weakened; (2) the load transfer provided by Cs+ is very weak. Additionally, a "hydrolytic weakening" mechanism is proposed to explain the mechanical degradation with increasing water content. This study also provides guidance for studying the influence of other wastes (like heavy metal ions) in concrete.
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Affiliation(s)
- M F Kai
- Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
| | - L W Zhang
- Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - K M Liew
- Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
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7
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Smirnov PR. Structure of the Nearest Environment of
Na+, K+,
Rb+, and Cs+ Ions in
Oxygen-Containing Solvents. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220090169] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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8
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Reynolds JG. The (almost) ideal thermodynamics of aqueous rubidium nitrite solutions from 0.3 to 62.3 molal. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Lynes O, Austin J, Kerridge A. Ab initio molecular dynamics studies of hydroxide coordination of alkaline earth metals and uranyl. Phys Chem Chem Phys 2019; 21:13809-13820. [PMID: 31210212 DOI: 10.1039/c9cp00142e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Ab initio molecular dynamics (AIMD) simulations of the Mg2+, Ca2+, Sr2+ and UO22+ ions in either a pure aqueous environment or an environment containing two hydroxide ions have been carried out at the density functional level of theory, employing the generalised gradient approximation via the PBE exchange-correlation functional. Calculated mean M-O bond lengths in the first solvation shell of the aquo systems compared very well to existing experimental and computational literature, with bond lengths well within values measured previously and coordination numbers in line with previously calculated values. When applied to systems containing additional hydroxide ions, the methodology revealed increased bond lengths in all systems. Proton transfer events (PTEs) were recorded and were found to be most prevalent in the strontium hydroxide systems, likely due to the low charge density of the ion and the consequent lack of hydroxide coordination. For all alkaline earths, intrashell PTEs which occurred outside of the first solvation shell were most prevalent. Only three PTEs were identified in the entire simulation data of the uranium dihydroxide system, indicating the clear impact of the increased charge density of the hexavalent uranium ion on the strength of metal-oxygen bonds in aqueous solution. Broadly, systems containing more charge dense ions were found to exhibit fewer PTEs than those containing ions of lower charge density.
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Affiliation(s)
- Olivia Lynes
- Department of Chemistry, Faraday Building, Lancaster University, Lancaster, LA1 4YB, UK.
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10
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Zhou L, Xu J, Xu L, Wu X. Importance of van der Waals effects on the hydration of metal ions from the Hofmeister series. J Chem Phys 2019; 150:124505. [PMID: 30927898 DOI: 10.1063/1.5086939] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The van der Waals (vdW) interaction plays a crucial role in the description of liquid water. Based on ab initio molecular dynamics simulations, including the non-local and fully self-consistent density-dependent implementation of the Tkatchenko-Scheffler dispersion correction, we systematically studied the aqueous solutions of metal ions (K+, Na+, and Ca2+) from the Hofmeister series. Similar to liquid water, the vdW interactions strengthen the attractions among water molecules in the long-range, leading to the hydrogen bond networks softened in all the ion solutions. However, the degree that the hydration structure is revised by the vdW interactions is distinct for different ions, depending on the strength of short-range interactions between the hydrated ion and surrounding water molecules. Such revisions by the vdW interactions are important for the understanding of biological functionalities of ion channels.
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Affiliation(s)
- Liying Zhou
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Jianhang Xu
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Limei Xu
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Xifan Wu
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
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11
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Hydration of counterions interacting with DNA double helix: a molecular dynamics study. J Mol Model 2018; 24:171. [DOI: 10.1007/s00894-018-3704-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 06/06/2018] [Indexed: 12/12/2022]
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12
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Zhang W, Fang C, Fang Y, Zhu F, Zhou Y, Liu H, Li W. Structure of aqueous cesium metaborate solutions by X-ray scattering and DFT calculation. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.12.099] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Watanabe HC, Kubillus M, Kubař T, Stach R, Mizaikoff B, Ishikita H. Cation solvation with quantum chemical effects modeled by a size-consistent multi-partitioning quantum mechanics/molecular mechanics method. Phys Chem Chem Phys 2017; 19:17985-17997. [DOI: 10.1039/c7cp01708a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the condensed phase, quantum chemical properties such as many-body effects and intermolecular charge fluctuations are critical determinants of the solvation structure and dynamics.
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Affiliation(s)
- Hiroshi C. Watanabe
- Research Center for Advanced Science and Technology
- The University of Tokyo
- Tokyo 153-8904
- Japan
- Department of Applied Chemistry
| | - Maximilian Kubillus
- Institute of Physical Chemistry and Center for Functional Nanostructures
- Karlsruhe Institute of Technology
- Karlsruhe 73131
- Germany
| | - Tomáš Kubař
- Institute of Physical Chemistry and Center for Functional Nanostructures
- Karlsruhe Institute of Technology
- Karlsruhe 73131
- Germany
| | - Robert Stach
- Institute of Analytical Bioanalytical Chemistry
- Ulm University
- Ulm 89081
- Germany
| | - Boris Mizaikoff
- Institute of Analytical Bioanalytical Chemistry
- Ulm University
- Ulm 89081
- Germany
| | - Hiroshi Ishikita
- Research Center for Advanced Science and Technology
- The University of Tokyo
- Tokyo 153-8904
- Japan
- Department of Applied Chemistry
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14
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Investigation on species distribution and EXAFS structure of aqueous rubidium pentaborate solutions. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.12.081] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Vašák M, Schnabl J. Sodium and Potassium Ions in Proteins and Enzyme Catalysis. Met Ions Life Sci 2016; 16:259-90. [DOI: 10.1007/978-3-319-21756-7_8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Smirnov PR. Comparative analysis of structural parameters of the nearest surrounding of nitrate and perchlorate ions in aqueous solutions of electrolytes. RUSS J GEN CHEM+ 2014. [DOI: 10.1134/s1070363214100016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Smirnov PR. Comparative review of structural parameters of the nearest surrounding of monoatomic cations in water and methanol media. RUSS J GEN CHEM+ 2013. [DOI: 10.1134/s1070363213110017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Shiga M, Masia M. Boundary based on exchange symmetry theory for multilevel simulations. II. Multiple time scale approach. J Chem Phys 2013; 139:144103. [DOI: 10.1063/1.4823729] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ikeda T, Boero M. Communication: Hydration structure and polarization of heavy alkali ions: A first principles molecular dynamics study of Rb+ and Cs+. J Chem Phys 2012; 137:041101. [DOI: 10.1063/1.4742151] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Abstract
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The hydration of the alkali metal ions in aqueous solution
has been studied by large angle X-ray scattering (LAXS) and double
difference infrared spectroscopy (DDIR). The structures of the dimethyl
sulfoxide solvated alkali metal ions in solution have been determined
to support the studies in aqueous solution. The results of the LAXS
and DDIR measurements show that the sodium, potassium, rubidium and
cesium ions all are weakly hydrated with only a single shell of water
molecules. The smaller lithium ion is more strongly hydrated, most
probably with a second hydration shell present. The influence of the
rubidium and cesium ions on the water structure was found to be very
weak, and it was not possible to quantify this effect in a reliable
way due to insufficient separation of the O–D stretching bands
of partially deuterated water bound to these metal ions and the O–D
stretching bands of the bulk water. Aqueous solutions of sodium, potassium
and cesium iodide and cesium and lithium hydroxide have been studied
by LAXS and M–O bond distances have been determined fairly
accurately except for lithium. However, the number of water molecules
binding to the alkali metal ions is very difficult to determine from
the LAXS measurements as the number of distances and the temperature
factor are strongly correlated. A thorough analysis of M–O
bond distances in solid alkali metal compounds with ligands binding
through oxygen has been made from available structure databases. There
is relatively strong correlation between M–O bond distances
and coordination numbers also for the alkali metal ions even though
the M–O interactions are weak and the number of complexes of
potassium, rubidium and cesium with well-defined coordination geometry
is very small. The mean M–O bond distance in the hydrated sodium,
potassium, rubidium and cesium ions in aqueous solution have been
determined to be 2.43(2), 2.81(1), 2.98(1) and 3.07(1) Å, which
corresponds to six-, seven-, eight- and eight-coordination. These
coordination numbers are supported by the linear relationship of the
hydration enthalpies and the M–O bond distances. This correlation
indicates that the hydrated lithium ion is four-coordinate in aqueous
solution. New ionic radii are proposed for four- and six-coordinate
lithium(I), 0.60 and 0.79 Å, respectively, as well as for five-
and six-coordinate sodium(I), 1.02 and 1.07 Å, respectively.
The ionic radii for six- and seven-coordinate K+, 1.38
and 1.46 Å, respectively, and eight-coordinate Rb+ and Cs+, 1.64 and 1.73 Å, respectively, are confirmed
from previous studies. The M–O bond distances in dimethyl sulfoxide
solvated sodium, potassium, rubidium and cesium ions in solution are
very similar to those observed in aqueous solution. The hydration of alkali metal ions has been studied by large angle
X-ray scattering, LAXS, and double difference infrared spectroscopy.
The obtained M−O bond distances from LAXS have been compared
to relevant crystal structures, conclusions about hydration numbers
in aqueous solution have been made, and new ionic radii have been
proposed. Hydration numbers of six, seven, eight and eight are proposed
for the sodium, potassium, rubidium and cesium ions in aqueous solution.
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Affiliation(s)
- Johan Mähler
- Department of Chemistry, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden
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Smirnov PR, Trostin VN. Structural parameters of Ca2+ ion nearest neighbors in aqueous solution of its salts. RUSS J GEN CHEM+ 2009. [DOI: 10.1134/s1070363209080027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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