Xavier Gaona
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View article: Solubility, Speciation and Thermodynamics of PuCO <sub>3</sub> OH(cr) in Carbonate Containing NaCl Solutions
Solubility, Speciation and Thermodynamics of PuCO <sub>3</sub> OH(cr) in Carbonate Containing NaCl Solutions Open
The solubility, aqueous speciation, and solid phase formation of trivalent plutonium, Pu(III) was investigated for the first time in pH near‐neutral 0.10 M NaCl solutions under the presence of carbonate at T = (23 ± 2) °C in the frame of a…
View article: The role of halides in the bonding and electronic structure of actinyl(VI) halides - energy match driven stability
The role of halides in the bonding and electronic structure of actinyl(VI) halides - energy match driven stability Open
The role of the equatorial ligands and their influence on the electronic structure and bonding properties of uranyl and other actinyls are not well understood and thus at the forefront of actinide research. In the study presented here, we …
View article: Development and improvement of thermodynamic understanding for use in nuclear waste disposal safety case
Development and improvement of thermodynamic understanding for use in nuclear waste disposal safety case Open
Development and Improvement of Thermodynamic Understanding for use in nuclear waste disposal Safety Case (DITUSC) is a work package within the Eurad-2 project. This 24-month strategic study aims to enhance scientific knowledge to predict l…
View article: THEREDA - Thermodynamic Reference Database
THEREDA - Thermodynamic Reference Database Open
Part of the process to ensure the safety of radioactive waste disposal is the predictive modeling of the solubility of all relevant toxic components in a complex aqueous solution. To ensure the reliability of thermodynamic equilibrium mode…
View article: <i>Ab Initio</i> Speciation of Tc-Gluconate Complexes in Aqueous Systems
<i>Ab Initio</i> Speciation of Tc-Gluconate Complexes in Aqueous Systems Open
Tc-gluconate complexes in aqueous systems were recently reported and characterized by Tc L3-edge X-ray absorption near-edge structure (XANES) measurements [Dardenne, K.; Inorg. Chem. 2021, 60, 12285-12298]. The puzzling result was reported…
View article: Structural characterization of amorphous hydrous Zr(IV) oxide and the transformation occurring under hydrothermal conditions
Structural characterization of amorphous hydrous Zr(IV) oxide and the transformation occurring under hydrothermal conditions Open
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View article: Solubility, speciation and thermodynamics of Fe in reducing aqueous KCl solutions
Solubility, speciation and thermodynamics of Fe in reducing aqueous KCl solutions Open
Iron corrosion phases influence chemical conditions in several anthropogenic applications. New experimental data and thermodynamic models derived in this work allow accurate predictions of Fe behavior under relevant environmental condition…
View article: Improved Pitzer activity model for Tc(<scp>iv</scp>) solubility and hydrolysis in the Tc(<scp>iv</scp>)–Na<sup>+</sup>–K<sup>+</sup>–Ca<sup>2+</sup>–Mg<sup>2+</sup>–H<sup>+</sup>–Cl<sup>−</sup>–OH<sup>−</sup>–H<sub>2</sub>O(l) system
Improved Pitzer activity model for Tc(<span>iv</span>) solubility and hydrolysis in the Tc(<span>iv</span>)–Na<sup>+</sup>–K<sup>+</sup>–Ca<sup>2+</sup>–Mg<sup>2+</sup>–H<sup>+</sup>–Cl<sup>−</sup>–OH<sup>−</sup>–H<sub>2</sub>O(l) system Open
The study provides an extended and improved Pitzer model for Tc( iv ) in NaCl, KCl, CaCl 2 and MgCl 2 systems, which can be implemented in geochemical calculations of relevance in the context of nuclear waste disposal.
View article: Uptake of H<sup>14</sup>CO<sub>3</sub><sup>−</sup>/<sup>14</sup>CO<sub>3</sub><sup>2−</sup> by calcite: impact of ISA and chloride
Uptake of H<sup>14</sup>CO<sub>3</sub><sup>−</sup>/<sup>14</sup>CO<sub>3</sub><sup>2−</sup> by calcite: impact of ISA and chloride Open
Retention of inorganic 14 C by calcite quantified and mechanistically assessed under advanced cement degradation conditions.
View article: Gluconate and formate uptake by hydrated cement phases
Gluconate and formate uptake by hydrated cement phases Open
The uptake of formate and gluconate by C–S–H, AFm phases, ettringite and hydrated Portland cement (PC) was studied at pH 13 by batch sorption experiments. The formation of gluconate and formate-AFm phases was observed in pure systems, but …
View article: Solubility, complexation and thermodynamics of the Tc(IV)–isosaccharinic acid system: Trends in the M(IV) series
Solubility, complexation and thermodynamics of the Tc(IV)–isosaccharinic acid system: Trends in the M(IV) series Open
Isosaccharinic acid (HISA, or ISA in its deprotonated form) is the main degradation product of cellulose under alkaline conditions. It can form strong complexes with radionuclides and other toxic metal ions, eventually enhancing their mobi…
View article: Thermodynamic description of U(IV) solubility and hydrolysis in chloride systems: Pitzer activity model for the system U4+–Na+–Mg2+–Ca2+–H+–Cl––OH––H2O(l)
Thermodynamic description of U(IV) solubility and hydrolysis in chloride systems: Pitzer activity model for the system U4+–Na+–Mg2+–Ca2+–H+–Cl––OH––H2O(l) Open
This study presents updated chemical, thermodynamic, and activity models for the system U4+–Na+–Mg2+–Ca2+–H+–Cl––OH––H2O(l) derived using the Pitzer formalism and a strict ion interaction approach. The models build on comprehensive solubil…
View article: Uptake of Cm (III) and Eu (III) by C–S–H phases under saline conditions in presence of EDTA: A batch sorption and TRLFS study
Uptake of Cm (III) and Eu (III) by C–S–H phases under saline conditions in presence of EDTA: A batch sorption and TRLFS study Open
Eu (III) and Cm (III) uptake by calcium silicate hydrate phases (C–S–H) was investigated in presence of EDTA in NaCl and CaCl2 solutions. Different experimental parameters, i.e., ionic strength (0.1 m ≤ I'm ≤ 5.05 m), ligand concentration …
View article: Degradation of the polyacrylonitrile-based UP2W material under cementitious conditions
Degradation of the polyacrylonitrile-based UP2W material under cementitious conditions Open
UP2W is a polyacrylonitrile-based filter aid material used in nuclear power plants, which is disposed in repositories for low and intermediate level radioactive waste. The degradation of UP2W was investigated in a series of batch experimen…
View article: Uptake of chloride and isosaccharinic acid by cement paste with high slag content (CEM III/C)
Uptake of chloride and isosaccharinic acid by cement paste with high slag content (CEM III/C) Open
The uptake of chloride (Cl−) and isosaccharinic acid (ISA, main degradation product of cellulose) by cement paste with high slag content (CEM III/C) was investigated with batch sorption experiments with 36Cl and inactive ISA. A weak uptake…
View article: Citrate sorption on cement hydrates
Citrate sorption on cement hydrates Open
The interaction of citrate with hydrated Portland cement and its main hydrates: C-S-H (0.8 ≤ Ca/Si ≤ 1.4), ettringite, monosulfo-, hemi- and monocarboaluminate is investigated. The solubility of citrate-AFm and citrate-AFt was determined. …
View article: Thermodynamics of the Eu(<scp>iii</scp>)–Mg–SO<sub>4</sub>–H<sub>2</sub>O and Eu(<scp>iii</scp>)–Na–SO<sub>4</sub>–H<sub>2</sub>O systems. Part II: spectroscopy experiments, complexation and Pitzer/SIT models
Thermodynamics of the Eu(<span>iii</span>)–Mg–SO<sub>4</sub>–H<sub>2</sub>O and Eu(<span>iii</span>)–Na–SO<sub>4</sub>–H<sub>2</sub>O systems. Part II: spectroscopy experiments, complexation and Pitzer/SIT models Open
Thermodynamic description of complex sulfate systems of relevance for nuclear waste disposal. Pitzer and SIT models including aqueous complexes derived for the Eu( iii )–Mg/Na–SO 4 –H 2 O system based on solubility experiments and TRLFS me…
View article: Thermodynamics of the Eu(<scp>iii</scp>)–Mg–SO<sub>4</sub>–H<sub>2</sub>O and Eu(<scp>iii</scp>)–Na–SO<sub>4</sub>–H<sub>2</sub>O systems. Part I: solubility experiments and the full dissociation Pitzer model
Thermodynamics of the Eu(<span>iii</span>)–Mg–SO<sub>4</sub>–H<sub>2</sub>O and Eu(<span>iii</span>)–Na–SO<sub>4</sub>–H<sub>2</sub>O systems. Part I: solubility experiments and the full dissociation Pitzer model Open
A thermodynamic description of complex sulfate systems of relevance for nuclear waste disposal is provided. A full dissociation Pitzer model is derived for the system Eu( iii )–Mg/Na–SO 4 –H 2 O based on solubility experiments and comprehe…
View article: Solids, colloids, and the hydrolysis of tetravalent uranium in chloride media
Solids, colloids, and the hydrolysis of tetravalent uranium in chloride media Open
Understanding of the properties of dissolution and precipitation of Uranium under reducing geochemical conditions is important in radioactive waste management and assessments of natural uranium deposits. The mechanism of forming UO 2+y fro…
View article: Editorial: Solubility phenomena in the context of nuclear waste disposal
Editorial: Solubility phenomena in the context of nuclear waste disposal Open
EDITORIAL article Front. Nucl. Eng., 21 November 2023Sec. Radioactive Waste Management Volume 2 - 2023 | https://doi.org/10.3389/fnuen.2023.1332806