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Solubility of triuranyl diphosphate tetrahydrate (TDT) and Na autunite at 23 and 50 °C
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Christopher R. Armstrong
Veröffentlicht/Copyright:
23. November 2010
Abstract
In this report we present experimental solubility data for well-characterized triuranyl diphosphate tetrahydrate (TDT: (UO2)3(PO4)2·4H2O) and Na autunite (Na[UO2PO4]· x H2O) at 23 and 50 °C in NaClO4-HClO4 solutions at pCH+=2. Duplicate samples of TDT in 0.1, 0.5, 1.0, 2.0 and 5.0 m solutions were equilibrated at 23 and 50 °C. TDT solid was synthesized and characterized with ICP-OES, ATR-IR and powder XRD before and after solubility experiments. The pH of the suspensions were monitored throughout the experiments. Equilibrium was achieved from undersaturation with respect to TDT and oversaturation for Na autunite. Steady-state conditions were achieved in all cases within 82 d. TDT was unstable at ionic strengths above 0.1 m, where its complete conversion to Na autunite was observed. The ion-interaction model was used to interpret the experimental solubility data. The solubility product, logߙKsp, for TDT was determined to be −49.7 and −51.3 at 23 and 50 °C respectively. logߙKsp for Na autunite was determined to be −24.4 (23 °C) and −24.1±0.2 (50 °C).
Published Online: 2010-11-23
Published in Print: 2010-11
© by Oldenbourg Wissenschaftsverlag, Pullman, WA 99163, Germany
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Artikel in diesem Heft
- Preface
- Solubility of tetravalent actinides in alkaline CaCl2 solutions and formation of Ca4[An(OH)8]4+ complexes: A study of Np(IV) and Pu(IV) under reducing conditions and the systematic trend in the An(IV) series
- Solubility of triuranyl diphosphate tetrahydrate (TDT) and Na autunite at 23 and 50 °C
- Effect of reduction on the stability of Pu(VI) hydrolysis species
- Retention and redox behaviour of uranium(VI) by siderite (FeCO3)
- Neptunium(V) complexation by natural pyoverdins and related model compounds
- Complexation of Nd(III) with tetraborate ion and its effect on actinide(III) solubility in WIPP brine
- Complexation of Tc(IV) with acetate at varying ionic strengths
- Uranyl photochemistry: decarboxylation of gluconic acid
- Influence of Boom Clay organic matter on the adsorption of Eu3+ by illite – geochemical modelling using the component additivity approach
- The role of green rust in the migration of radionuclides: An overview of processes that can control mobility of radioactive elements in the environment using as examples Np, Se and Cr
- A comparative batch sorption and time-resolved laser fluorescence spectroscopy study on the sorption of Eu(III) and Cm(III) on synthetic and natural kaolinite
- U(VI) sorption on granite: prediction and experiments
- Quantum chemical study of inner-sphere complexes of trivalent lanthanide and actinide ions on the corundum (0001) surface
- Quantum chemical modeling of uranyl adsorption on mineral surfaces
- Interaction of PuO2 thin films with water
- Molecular interactions of plutonium(VI) with synthetic manganese-substituted goethite
- Chlorine speciation in nuclear graphite: consequences on temperature release and on leaching
- Chemical status of U(VI) in cemented waste forms under saline conditions
- Influence of iron redox transformations on plutonium sorption to sediments
- Modelling of a large-scale in-situ migration experiment with 14C-labelled natural organic matter in Boom Clay
- Sorption and diffusion of Eu in sedimentary rock in the presence of humic substance
- Diffusion and sorption of neptunium(V) in compacted montmorillonite: effects of carbonate and salinity
- Uranium(VI) diffusion in low-permeability subsurface materials
- Distribution of Cs and Am in the solution-bentonite colloids-granite ternary system: effect of addition order and sorption reversibility
- Mechanisms of plutonium sorption to mineral oxide surfaces: new insights with implications for colloid-enhanced migration
- Understanding uranium behaviour at the Askola uranium mineralization
Schlagwörter für diesen Artikel
Autunite;
U(VI) phosphate minerals;
Actinide contaminant remediation
Artikel in diesem Heft
- Preface
- Solubility of tetravalent actinides in alkaline CaCl2 solutions and formation of Ca4[An(OH)8]4+ complexes: A study of Np(IV) and Pu(IV) under reducing conditions and the systematic trend in the An(IV) series
- Solubility of triuranyl diphosphate tetrahydrate (TDT) and Na autunite at 23 and 50 °C
- Effect of reduction on the stability of Pu(VI) hydrolysis species
- Retention and redox behaviour of uranium(VI) by siderite (FeCO3)
- Neptunium(V) complexation by natural pyoverdins and related model compounds
- Complexation of Nd(III) with tetraborate ion and its effect on actinide(III) solubility in WIPP brine
- Complexation of Tc(IV) with acetate at varying ionic strengths
- Uranyl photochemistry: decarboxylation of gluconic acid
- Influence of Boom Clay organic matter on the adsorption of Eu3+ by illite – geochemical modelling using the component additivity approach
- The role of green rust in the migration of radionuclides: An overview of processes that can control mobility of radioactive elements in the environment using as examples Np, Se and Cr
- A comparative batch sorption and time-resolved laser fluorescence spectroscopy study on the sorption of Eu(III) and Cm(III) on synthetic and natural kaolinite
- U(VI) sorption on granite: prediction and experiments
- Quantum chemical study of inner-sphere complexes of trivalent lanthanide and actinide ions on the corundum (0001) surface
- Quantum chemical modeling of uranyl adsorption on mineral surfaces
- Interaction of PuO2 thin films with water
- Molecular interactions of plutonium(VI) with synthetic manganese-substituted goethite
- Chlorine speciation in nuclear graphite: consequences on temperature release and on leaching
- Chemical status of U(VI) in cemented waste forms under saline conditions
- Influence of iron redox transformations on plutonium sorption to sediments
- Modelling of a large-scale in-situ migration experiment with 14C-labelled natural organic matter in Boom Clay
- Sorption and diffusion of Eu in sedimentary rock in the presence of humic substance
- Diffusion and sorption of neptunium(V) in compacted montmorillonite: effects of carbonate and salinity
- Uranium(VI) diffusion in low-permeability subsurface materials
- Distribution of Cs and Am in the solution-bentonite colloids-granite ternary system: effect of addition order and sorption reversibility
- Mechanisms of plutonium sorption to mineral oxide surfaces: new insights with implications for colloid-enhanced migration
- Understanding uranium behaviour at the Askola uranium mineralization
