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Hajihosseinloo A, Salahinejad M, Rofouei MK, Ghasemi JB. Exploratory and machine learning analysis of the stability constants of HgII- triazene ligands complexes. MAIN GROUP CHEMISTRY 2021. [DOI: 10.3233/mgc-210130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Knowing stability constants for the complexes HgII with extracting ligands is very important from environmental and therapeutic standpoints. Since the selectivity of ligands can be stated by the stability constants of cation–ligand complexes, quantitative structure–property relationship (QSPR) investigations on binding constant of HgII complexes were done. Experimental data of the stability constants in ML2 complexation of HgII and synthesized triazene ligands were used to construct and develop QSPR models. Support vector machine (SVM) and multiple linear regression (MLR) have been employed to create the QSPR models. The final model showed squared correlation coefficient of 0.917 and the standard error of calibration (SEC) value of 0.141 log K units. The proposed model presented accurate prediction with the Leave-One-Out cross validation ( Q LOO 2 = 0.756) and validated using Y-randomization and external test set. Statistical results demonstrated that the proposed models had suitable goodness of fit, predictive ability, and robustness. The results revealed the importance of charge effects and topological properties of ligand in HgII - triazene complexation.
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Affiliation(s)
| | - Maryam Salahinejad
- Maryam Salahinejad, Nuclear Science and Technology Research Institute, Tehran, Iran
| | | | - Jahan B. Ghasemi
- Department of Chemistry, Faculty of Science, University of Tehran, Tehran, Iran
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2
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DiBlasi NA, Tasi AG, Gaona X, Fellhauer D, Dardenne K, Rothe J, Reed DT, Hixon AE, Altmaier M. Impact of Ca(II) on the aqueous speciation, redox behavior, and environmental mobility of Pu(IV) in the presence of EDTA. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 783:146993. [PMID: 33866175 DOI: 10.1016/j.scitotenv.2021.146993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 04/01/2021] [Accepted: 04/03/2021] [Indexed: 06/12/2023]
Abstract
The impact of calcium on the solubility and redox behavior of the Pu(IV)-EDTA system was investigated using a combination of undersaturation solubility studies and advanced spectroscopic techniques. Batch solubility experiments were conducted in 0.1 M NaCl-NaOH-HCl-EDTA-CaCl2 solutions at constant [EDTA] = 1∙10-3 M, 1 ≤ pHm ≤ 11, and 1∙10-3 M ≤ [CaCl2] ≤ 2∙10-2 M. Additional samples targeted brine systems represented by 3.5 M CaCl2 and WIPP simulated brine. Redox conditions were buffered with hydroquinone (pe + pH ≈ 9.5) with selected samples prepared in the absence of any redox buffer. All experiments were performed at T = 22 °C under Ar atmosphere. In-situ X-ray absorption spectroscopy indicated that PuO2(ncr,hyd) was the solubility-controlling phase during the lifetime of all experiments and that aqueous plutonium was present in the +IV oxidation state across all experimental conditions except at pHm ≈ 1, where a small fraction of Pu(III) was also identified. Current thermodynamic models overestimate Pu(IV)-EDTA solubility in the absence of calcium by approximately 1-1.5 log10-units and do not describe the nearly pH-independent, increased solubility observed with increased calcium concentrations. The ternary Pu(IV)-OH-EDTA system without calcium was reevaluated using solubility data obtained in this work and reported in the literature. An updated thermodynamic model including the complexes Pu(OH)(EDTA)-, Pu(OH)2(EDTA)2-, and Pu(OH)3(EDTA)3- was derived. Solubility data collected in the presence of calcium follows a pH-independent trend (log m(Pu)tot vs. pHm), which can only be explained by assuming the formation of a quaternary complex, tentatively defined as CaPu(OH)4(EDTA)2-, in solution. The significant enhancement of plutonium solubility observed in the investigated brine systems supports the formation of a quaternary complex that is not outcompeted by Ca(EDTA)2-, even in concentrated CaCl2 solutions. Although the exact stoichiometry of the complex may need to be revisited, this new quaternary complex has a pronounced impact on plutonium predominance diagrams over a broad range of pH, pe, and calcium concentrations that are relevant to nuclear waste disposal.
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Affiliation(s)
- Nicole A DiBlasi
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, 301 Stinson-Remick, Notre Dame, IN 46556, United States of America
| | - Agost G Tasi
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Xavier Gaona
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany.
| | - David Fellhauer
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Kathy Dardenne
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Jörg Rothe
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Donald T Reed
- Los Alamos National Laboratory, 1400 University Dr., Carlsbad, NM 88220, United States of America
| | - Amy E Hixon
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, 301 Stinson-Remick, Notre Dame, IN 46556, United States of America.
| | - Marcus Altmaier
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
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3
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DiBlasi NA, Yalçintas E, Stanley FE, Reed DT, Hixon AE. Influence of ethylenediaminetetraacetic acid on the long-term oxidation state distribution of plutonium. CHEMOSPHERE 2021; 274:129741. [PMID: 33545584 DOI: 10.1016/j.chemosphere.2021.129741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 01/08/2021] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
Spectrophotometry was used to study the effect of EDTA on plutonium oxidation state distribution as a function of time, pH, and ligand-to-metal ratio (L/M) under anoxic conditions. Novel Pu(V)-EDTA absorption bands were identified at 571, 993, 1105, and 1150 nm with molar absorption coefficients of 15 ± 1, 6 ± 1, 10 ± 1, and 10 ± 1 cm-1M-1, respectively. Pu(V)-EDTA spectral changes occurred at L/M < 1, indicating only PuVO2(EDTA)3- formed with logK = 3.6 ± 0.3. Time-resolved experiments showed EDTA drastically increased the Pu(V/VI) reduction rate, which we propose is driven by amine lone-pair electron donation and the oxidative decarboxylation of EDTA. Oxidation of Pu(III)-EDTA to Pu(IV)-EDTA occurred on a slower time scale (110-237 days) than previously reported (<15 min) and is hypothesized to be radiolysis driven. Pu(V/VI)-EDTA and Pu(III)-EDTA both approached Pu(IV)-EDTA stabilization over time, yet Pu(V/VI)-EDTA solubility data was ≥ 1.0 log10 units higher than predicted by Pu(IV)-EDTA solubility models, indicating that current thermodynamic models are incomplete. Ultimately, the data show EDTA preferentially stabilizes Pu(IV) over time regardless of initial oxidation state, but Pu(V)-EDTA can persist under environmentally-relevant conditions, emphasizing the need to continue investigating redox reactions, speciation, and behavior of these complexes to support the transuranic waste disposal and surface remediation/containment efforts.
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Affiliation(s)
- Nicole A DiBlasi
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, 301 Stinson-Remick Hall, Notre Dame, IN, 46556, USA; Los Alamos National Laboratory, 1400 University Dr., Carlsbad, NM, 88220, USA
| | - Ezgi Yalçintas
- Los Alamos National Laboratory, 1400 University Dr., Carlsbad, NM, 88220, USA
| | - Floyd E Stanley
- Los Alamos National Laboratory, 1400 University Dr., Carlsbad, NM, 88220, USA
| | - Donald T Reed
- Los Alamos National Laboratory, 1400 University Dr., Carlsbad, NM, 88220, USA
| | - Amy E Hixon
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, 301 Stinson-Remick Hall, Notre Dame, IN, 46556, USA.
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4
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Zurita C, Tsushima S, Bresson C, Garcia Cortes M, Solari PL, Jeanson A, Creff G, Den Auwer C. How Does Iron Storage Protein Ferritin Interact with Plutonium (and Thorium)? Chemistry 2020; 27:2393-2401. [PMID: 32955137 DOI: 10.1002/chem.202003653] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/07/2020] [Indexed: 11/12/2022]
Abstract
The impact of the contamination of living organisms by actinide elements has been a constant subject of attention since the 1950s. But to date still little is understood. Ferritin is the major storage and regulation protein of iron in many organisms, it consists of a protein ring and a ferrihydric core at the center. This work sheds light on the interactions of early actinides (Th, Pu) at oxidation state +IV with ferritin and its ability to store those elements at physiological pH compared to Fe. The ferritin-thorium load curve suggests that ThIV saturates the protein (2840 Th atoms per ferritin) in a similar way that Fe does on the protein ring. Complementary spectroscopic techniques (spectrophotometry, infrared spectroscopy, and X-ray absorption spectroscopy) were combined with molecular dynamics to provide a structural model of the interaction of ThIV and PuIV with ferritin. Comparison of spectroscopic data together with MD calculations suggests that ThIV and PuIV are complexed mainly on the protein ring and not on the ferrihydric core. Indeed from XAS data, there is no evidence of Fe neighbors in the Th and Pu environments. On the other hand, carboxylates from amino acids of the protein ring and a possible additional carbonate anion are shaping the cation coordination spheres. This thorough description from a molecular view point of ThIV and PuIV interaction with ferritin, an essential iron storage protein, is a cornerstone in comprehensive nuclear toxicology.
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Affiliation(s)
- Cyril Zurita
- CNRS, Institut de Chimie de Nice, Université Côte d'Azur, 06108, Nice, France
| | - Satoru Tsushima
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328, Dresden, Germany.,World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, Meguro, 152-8550, Tokyo, Japan
| | - Carole Bresson
- CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
| | - Marta Garcia Cortes
- CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
| | - Pier Lorenzo Solari
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, 91192, Gif-sur-Yvette, Cedex, France
| | - Aurélie Jeanson
- CNRS, Institut de Chimie de Nice, Université Côte d'Azur, 06108, Nice, France
| | - Gaëlle Creff
- CNRS, Institut de Chimie de Nice, Université Côte d'Azur, 06108, Nice, France
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Solov'ev V, Tsivadze A, Marcou G, Varnek A. Classification of Metal Binders by Naïve Bayes Classifier on the Base of Molecular Fragment Descriptors and Ensemble Modeling. Mol Inform 2019; 38:e1900002. [DOI: 10.1002/minf.201900002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 03/15/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Vitaly Solov'ev
- A.N. Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of Sciences, Leninskiy prosp., 31 119071 Moscow Russia
| | - Aslan Tsivadze
- A.N. Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of Sciences, Leninskiy prosp., 31 119071 Moscow Russia
| | - Gilles Marcou
- Laboratoire de Chémoinformatique, UMR 7140 CNRSUniversité de Strasbourg 1, rue Blaise Pascal 67000 Strasbourg France
| | - Alexandre Varnek
- Laboratoire de Chémoinformatique, UMR 7140 CNRSUniversité de Strasbourg 1, rue Blaise Pascal 67000 Strasbourg France
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Friend MT, Zhao P, Zavarin M, Wall NA. Complexation of Plutonium(IV) with trans-1,2-Diaminocyclohexane-N,N,N′,N′-tetraacetic Acid (CDTA) in Acidic Solution. J SOLUTION CHEM 2019. [DOI: 10.1007/s10953-019-00859-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7
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Zong P, Cao D, Cheng Y, Wang S, Hayat T, Alharbi NS, Guo Z, Zhao Y, He C. Enhanced performance for Eu(iii) ion remediation using magnetic multiwalled carbon nanotubes functionalized with carboxymethyl cellulose nanoparticles synthesized by plasma technology. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00901e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of sodium carboxymethyl cellulose/iron oxides/MWCNTs composites by a plasma technique and their application to the decontamination of europium ions from aqueous solutions under controlled laboratory conditions.
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Affiliation(s)
- Pengfei Zong
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan
- P. R. China
| | - Duanlin Cao
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan
- P. R. China
| | - Yuan Cheng
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan
- P. R. China
| | - Shoufang Wang
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan
- P. R. China
| | - Tasawar Hayat
- Department of Mathematics
- Quaid-I-Azam University
- Islamabad
- Pakistan
- NAAM Research Group
| | - Njud S. Alharbi
- Biotechnology Research Group
- Department of Biological Sciences
- Faculty of Science
- King Abdulaziz University
- Jeddah
| | - Zhiqiang Guo
- School of Resources and Environmental Engineering
- Hefei University of Technology
- Hefei
- P. R. China
| | - Yaolin Zhao
- School of Nuclear Science and Technology
- Xi'an Jiaotong University
- Xi'an
- P. R. China
| | - Chaohui He
- School of Nuclear Science and Technology
- Xi'an Jiaotong University
- Xi'an
- P. R. China
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8
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Luchini C, Leguay S, Aupiais J, Cannes C, Le Naour C. Complexation of protactinium(v) with nitrilotriacetic acid: a study at the tracer scale. NEW J CHEM 2018. [DOI: 10.1039/c7nj04683a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexation of Pa(v) with nitrilotriacetic acid (NTA) in aqueous solution (1 M (Na,H)ClO4) was studied by solvent extraction at different acidities (pcH = 0.6; 1.0; 2.0 and 2.5) with the element at the tracer scale (CPa< 10−10M).
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Affiliation(s)
- C. Luchini
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | - S. Leguay
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | | | - C. Cannes
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | - C. Le Naour
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
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9
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Abstract
Abstract
Appropriate management of fission products in the reprocessing of spent nuclear fuel (SNF) is crucial in developing advanced reprocessing schemes. The addition of aqueous phase complexing agents can prevent the co-extraction of these fission products. A solvent extraction technique was used to study the complexation of Hf(IV) – an analog to fission product Zr(IV) – with oxalate at 15, 25, and 35°C in 1 M HClO4 utilizing a 175+181Hf radiotracer. The mechanism of the solvent extraction system of 10−5 M Hf(IV) in 1 M HClO4 to thenoyltrifluoroacetone (TTA) in toluene demonstrated a 4th-power dependence in both TTA and H+, with Hf(TTA)4 the only extractable species. The equilibrium constant for the extraction of Hf(TTA)4 was determined to be log K
ex=7.67±0.07 (25±1°C, 1 M HClO4). The addition of oxalate to the aqueous phase decreased the distribution ratio, indicating aqueous Hf(IV)-oxalate complex formation. Polynomial fits to the distribution data identified the formation of Hf(ox)2+ and Hf(ox)2 (aq) and their stability constants were measured at 15, 25, and 35°C in 1 M HClO4. van’t Hoff analysis was used to calculate Δr
G, Δr
H, and Δr
S for these species. Stability constants were observed to increase at higher temperature, an indication that Hf(IV)-oxalate complexation is endothermic and driven by entropy.
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Affiliation(s)
- Mitchell T. Friend
- Department of Chemistry, Washington State University, Pullman, WA, United States of America
| | - Nathalie A. Wall
- Department of Chemistry, Washington State University, Pullman, WA, United States of America
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The complexation of metal ions with various organic ligands in water: prediction of stability constants by QSPR ensemble modelling. J INCL PHENOM MACRO 2015. [DOI: 10.1007/s10847-015-0543-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Abraham F, Arab-Chapelet B, Rivenet M, Tamain C, Grandjean S. Actinide oxalates, solid state structures and applications. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.08.036] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Zeng M, Huang Y, Zhang S, Qin S, Li J, Xu J. Removal of uranium(vi) from aqueous solution by magnetic yolk–shell iron oxide@magnesium silicate microspheres. RSC Adv 2014. [DOI: 10.1039/c3ra45330h] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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Aryal BP, Paunesku T, Woloschak GE, He C, Jensen MP. A proteomic approach to identification of plutonium-binding proteins in mammalian cells. J Proteomics 2011; 75:1505-14. [PMID: 22146473 DOI: 10.1016/j.jprot.2011.11.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/29/2011] [Accepted: 11/19/2011] [Indexed: 11/18/2022]
Abstract
Plutonium can enter the body through different routes and remains there for decades; however its specific biochemical interactions are poorly defined. We, for the first time, have studied plutonium-binding proteins using a metalloproteomic approach with rat PC12 cells. A combination of immobilized metal ion chromatography, 2D gel electrophoresis, and mass spectrometry was employed to analyze potential plutonium-binding proteins. Our results show that several proteins from PC12 cells show affinity towards Pu(4+)-NTA (plutonium bound to nitrilotriacetic acid). Proteins from seven different spots in the 2D gel were identified. In contrast to the previously known plutonium-binding proteins transferrin and ferritin, which bind ferric ions, most identified proteins in our experiment are known to bind calcium, magnesium, or divalent transition metal ions. The identified plutonium interacting proteins also have functional roles in downregulation of apoptosis and other pro-proliferative processes. MetaCore™ analysis based on this group of proteins produced a pathway with a statistically significant association with development of neoplastic diseases.
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Affiliation(s)
- Baikuntha P Aryal
- Chemical Science and Engineering Division, Argonne National Lab, Argonne, IL, USA
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14
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Suzuki Y, Nankawa T, Francis AJ, Ohnuki T. Redox behavior of Ce(IV)/Ce(III) in the presence of nitrilotriacetic acid: A surrogate study for An(IV)/An(III) redox behavior. RADIOCHIM ACTA 2010. [DOI: 10.1524/ract.2010.1735] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Using cyclic voltammetry, we investigated the redox behavior of Ce(IV)/Ce(III), which is a surrogate for An(IV)/An(III) (An=actinides), in a solution of nitrilotriacetic acid (NTA) at 25 °C. The cyclic voltammogram of Ce in a 0.1 M NTA solution at pH 6 showed a reversible one-electron redox reaction for Ce(IV)/Ce(III) at 0.51 V vs. Ag/AgCl. This redox potential was much lower than that obtained in 1 M nitric acid, indicating that Ce(IV) was preferentially stabilized by complexation with NTA. The redox potential in the NTA solution was independent of the Ce concentration from 2 to 20 mM, NTA concentration from 5 to 200 mM and pH between 3 and 7. These results indicated that no polymerization and no additional coordination of NTA and OH− to the Ce(III)-NTA complex took place during the redox reaction. As the speciation calculation of Ce(III) in the NTA solution showed that the predominant species was CeIII(nta)2
3− (H3nta=NTA), the redox reaction of the Ce-NTA complex was expressed by the following: CeIV(nta)2
2−+e−⇋CeIII(nta)2
3−. The logarithm of the stability constant of CeIV(nta)2
2− was calculated to be 38.6±0.8 for I=0 from the redox potential shift of Ce(IV)/Ce(III) in the NTA solution. The value was in good accordance with the stability constant of the NpIV(nta)2
2− complex, demonstrating that the aqueous coordination chemistry of Ce(IV) with NTA is quite similar to that of An(IV). These results strongly suggest that a negative shift of the Pu(IV)/Pu(III) redox potential in the NTA solution should make Pu(IV) more stable than Pu(III) even in a reducing environment.
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Affiliation(s)
| | - T. Nankawa
- Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, 319-1195, Japan
| | | | - T. Ohnuki
- Japan Atomic Energy Research Institute, Advanced Science Research Center, Ibaraki, Japan
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