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Effect of humic acid on the sorption of Cm(III) onto γ-Al2O3 studied by the time-resolved laser fluorescence spectroscopy
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X. K. Wang
Veröffentlicht/Copyright:
25. September 2009
Summary
Sorption of Cm(III) onto γ-alumina coated with humic acid (HA) is studied by the Time Resolved Laser Fluorescence Spectroscopy (TRLFS). The experiments are performed at 0.1 M NaClO4, 0.44 g/L γ-Al2O3, 10 mg/L HA and at a metal ion concentration of 2×10-7 mol/L. At the investigated pH range (4 to 10) HA is completely sorbed to γ-Al2O3. The excitation spectrum of Cm(III) bound to HA/γ-Al2O3 in the wavelength range 370-400 nm exhibits broad flat bands very different from those obtained for the Cm(III) aquo ion and the Cm(III)-γ-Al2O3 surface complex, respectively. The spectrum, lacking distinctive structure due to intramolecular energy transfer processes, points to the predominant binding of the Cm(III) to surface-bound HA. TRLFS experiments performed at two different excitation wavelengths (λex=355 and 396.6 nm) allow for a differentiation of humic-bound and non-humic-bound Cm(III). Differences in fluorescence spectra obtained at the different excitation wavelengths are found at pH<6.9. They are due to the presence of the non-complexed Cm(III) aquo ion which is not detected in the indirect excitation mode (λex=355 nm). At pH≥7, the fluorescence spectra obtained by indirect and direct excitation become congruent and again point to the existence of only humic-bound Cm(III) species. Comparison of peak maxima and fluorescence lifetimes for Cm(III)-HA and Cm(III)-HA/γ-Al2O3, however, reveal differences. The results clearly indicate a contribution of the γ-Al2O3 surface to the Cm(III) binding and, thus, suggest the formation of ternary complexes such as >Al-O-Cm(III)(HA).
Published Online: 2009-9-25
Published in Print: 2004-11-1
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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- Actinide chemistry: from weapons to remediation to stewardship
- Thermodynamics and solubility of (UxNp1-x)O2(am) solid solution in the carbonate system
- Solubility and colloid formation of Th(IV) in concentrated NaCl and MgCl2 solution
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- On Mo-Ru-Tc-Pd-Rh-Te alloy particles extracted from spent fuel and their leaching behavior under Ar and H2 atmospheres
- Modeling of the complex formation of metal ions with humic acids
- Application of the NICA-Donnan model for proton, copper and uranyl binding to humic acid
- Protonation and complexation of isosaccharinic acid with U(VI) and Fe(III) in acidic solutions: potentiometric and calorimetric studies
- Carbonate complexation of neptunium(IV) in highly basic solutions
- Fluorescence characteristics of complex formation of europium(III)-salicylate
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- Electrochemical aspects of radiolytically enhanced UO2 dissolution
- Effect of alpha radiolysis on doped UO2 dissolution under reducing conditions
- The redox behaviour of plutonium in humic rich groundwater
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- Uranium adsorption on weathered schist – intercomparison of modelling approaches
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- Distribution and geochemical association of actinides in a contaminated soil as a function of grain size
- Interactions between anionic complex species of actinides and negatively charged mineral surfaces
- Measurements and modelling of Pm sorption onto TiO2 and goethite
- Effect of humic acid on the sorption of Cm(III) onto γ-Al2O3 studied by the time-resolved laser fluorescence spectroscopy
- Am(III) and Eu(III) uptake on hematite in the presence of humic acid
- Luminescence properties of tetravalent uranium in aqueous solution
- Scanning transmission X-ray microscopy as a speciation tool for natural organic molecules
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- Influence of humic substances on the 63Ni migration through crushed rock media
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- Results of the colloid and radionuclide retention experiment (CRR) at the Grimsel Test Site (GTS), Switzerland – impact of reaction kinetics and speciation on radionuclide migration
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Artikel in diesem Heft
- Preface: Migration Conference 2003
- Actinide chemistry: from weapons to remediation to stewardship
- Thermodynamics and solubility of (UxNp1-x)O2(am) solid solution in the carbonate system
- Solubility and colloid formation of Th(IV) in concentrated NaCl and MgCl2 solution
- Effect of reducing agents on the uranium concentration above uranium(IV) amorphous precipitate in Boom Clay pore water
- On Mo-Ru-Tc-Pd-Rh-Te alloy particles extracted from spent fuel and their leaching behavior under Ar and H2 atmospheres
- Modeling of the complex formation of metal ions with humic acids
- Application of the NICA-Donnan model for proton, copper and uranyl binding to humic acid
- Protonation and complexation of isosaccharinic acid with U(VI) and Fe(III) in acidic solutions: potentiometric and calorimetric studies
- Carbonate complexation of neptunium(IV) in highly basic solutions
- Fluorescence characteristics of complex formation of europium(III)-salicylate
- The reduction of U(VI) by near field hydrogen in the presence of UO2(s)
- Electrochemical aspects of radiolytically enhanced UO2 dissolution
- Effect of alpha radiolysis on doped UO2 dissolution under reducing conditions
- The redox behaviour of plutonium in humic rich groundwater
- The fate of radiolytic oxidants during spent fuel leaching in the presence of dissolved near field hydrogen
- Structural changes of uranyl moiety with reduction from U(VI) to U(V)
- Trivalent actinide coprecipitation with powellite (CaMoO4): Secondary solid solution formation during HLW borosilicate-glass dissolution
- Reproducibility of the uptake of U(VI) onto degraded cement pastes and calcium silicate hydrate phases
- Uranium adsorption on weathered schist – intercomparison of modelling approaches
- Contribution of minerals to the sorption of U(VI) on granite
- Distribution and geochemical association of actinides in a contaminated soil as a function of grain size
- Interactions between anionic complex species of actinides and negatively charged mineral surfaces
- Measurements and modelling of Pm sorption onto TiO2 and goethite
- Effect of humic acid on the sorption of Cm(III) onto γ-Al2O3 studied by the time-resolved laser fluorescence spectroscopy
- Am(III) and Eu(III) uptake on hematite in the presence of humic acid
- Luminescence properties of tetravalent uranium in aqueous solution
- Scanning transmission X-ray microscopy as a speciation tool for natural organic molecules
- Formation of hydroxyapatite in soils using calcium citrate and sodium phosphate for control of strontium migration
- Influence of humic substances on the 63Ni migration through crushed rock media
- U, Th, Eu and colloid mobility in a granite fracture under near-natural flow conditions
- Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms
- Interactions of trivalent and tetravalent heavy metal-siderophore complexes with Pseudomonas fluorescens
- In-situ diffusion of HTO, 22Na+, Cs+ and I- in Opalinus Clay at the Mont Terri underground rock laboratory
- Results of the colloid and radionuclide retention experiment (CRR) at the Grimsel Test Site (GTS), Switzerland – impact of reaction kinetics and speciation on radionuclide migration
- Fracture flow and radionuclide transport in block-scale laboratory experiments
- Comparison between in situ and laboratory diffusion studies of HTO and halides in Opalinus Clay from the Mont Terri
- Solubility constraints on uranium concentrations in groundwaters of the Tono uranium deposit, Japan
- Mobility of uranium in tertiary argillaceous sediments – a natural analogue study
- Redistribution of U, Pb and REE in association with alteration of uranium minerals from the Koongarra deposit, Northern Territory, Australia
- Towards a common thermodynamic database for speciation models
- Geochemically derived non-gaseous radionuclide source term for the Asse salt mine – assessment for the use of a Mg(OH)2-based backfill material
- Simulation of remediation alternatives for a 137Cs contaminated soil
- Simulating reactive transport in time dependent multiphase flow problems
- Reactive transport modelling of a spent fuel repository in a stiff clay formation considering excavation damaged zones
- Coupled transport/reaction modelling of copper canister corrosion aided by microbial processes
