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Thursday, July 30, 2020 | History

1 edition of Surface-complexation modeling of radionuclide adsorption in subsurface environments found in the catalog.

Surface-complexation modeling of radionuclide adsorption in subsurface environments

Surface-complexation modeling of radionuclide adsorption in subsurface environments

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Published by Division of High-Level Waste Management, Office of Nuclear Material Safety and Safeguards, U.S. Nuclear Regulatory Commission in Washington, DC .
Written in English

    Subjects:
  • Radioisotopes -- Migration -- Mathematical models.,
  • Adsorption -- Mathematical models.,
  • Surface chemistry -- Mathematical models.

  • Edition Notes

    Other titlesSurface complexation modeling of radionuclide adsorption in subsurface environments.
    StatementD.B. Kent ... [et al.].
    ContributionsKent, Douglas B., U.S. Nuclear Regulatory Commission. Office of Nuclear Material Safety and Safeguards. Division of High-Level Waste Management., Stanford University. Dept. of Civil Engineering., Sandia National Laboratories.
    The Physical Object
    Paginationxi, 113, 4 p. :
    Number of Pages113
    ID Numbers
    Open LibraryOL15399887M

    Several different surface complexation modeling approaches exist to describe the adsorption of solutes from water onto the surfaces of mineral phases. The Generalized Composite surface complexation modeling approach considers the surfaces of a mixed mineral assemblage, such as soils or sediments, to.   These results indicate that this model could be used as a first approximation in predicting U(VI) adsorption and transport in the subsurface. U(VI) adsorption also decreased at pH >10, even in the absence of carbonate, which is of potential importance to U(VI) mobility in extreme environments present in the subsurface at some DOE facilities.

    1 Application of the Surface Complexation Model to the Biosorption of Cu(II) and Pb(II) ions onto Pseudomonas pseudoalcaligenesBiomass Ruixia Liu1,2,*, Yonghui Song1,2 and Hongxiao Tang3 (1) State Key Laboratory of Environmental Criteria and Risk Assessment (SKLECRA), Chinese Research Academy of Environmental Sciences, Beijing , P.R. Surface-Complexation Modeling of Radionuclide Adsorption in Subsurface Environments. SAND; NUREG/CR SAND; NUREG/CR .

    Radionuclide Sorption in High-Level Waste Performance Assessment: Abstraction of Results from Experiments and Surface-Complexation Models. Workshop on Conceptual Model Development for Subsurface Reactive Transport Modeling of Inorganic Contaminants, Radionuclides, and Nutrients, April , The ability of predicting the fate and transport of heavy metals in the environment relies on the efficient modeling of sorption. A major challenge of geochemical modeling is to predict sorption as a function of varying environmental conditions, which can be achieved using surface complexation models (SCM).


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Surface-complexation modeling of radionuclide adsorption in subsurface environments Download PDF EPUB FB2

Get this from a library. Surface-complexation modeling of radionuclide adsorption in subsurface environments. [Douglas B Kent; U.S. Nuclear Regulatory Commission.

Division of High-Level Waste Management.; Stanford University. Department of Civil Engineering.; Sandia National Laboratories.;]. Description Surface Complexation Modelling deals with various aspects associate to the modelling of solutes adsorption from of solutes from aqueous solutions to minerals.

The individual contributions cover fundamental aspects and applications. Applications cover case studies and present consistent surface complexation parameter sets. Surface Complexation Modelling presents the state-of-the-art of surface complexation modelling and suggests ideas for further model development.

A number of chapters are authored by scientists working on nuclear waste storage, where the retention of radionuclides contributes to preventing radionuclide migration from the repository to the biosphere.5/5(1). Surface complexation models are chemical models that can account for the effects of variable chemical conditions, such as pH, on adsorption reactions.

Author: S. Goldberg. A surface complexation model was set up using Generalized Composite approach based on Eu(III) adsorption in NaCl electrolyte, supported by X-ray photoelectron spectroscopy and verified by Eu(III.

Clearly, an appropriate approach to model radionuclide transport in a subsurface system must account for the coupling of radionuclide redox chemistry with major biogeochemical processes.

Various reaction-transport models have been developed in recent years for modeling redox chemistry of subsurface systems (e.g., MacQuarrie et al.,McNab.

The Surface Complexation Model is a general concept considering the interfacial equilibrium caused by specific reactions of bulk species with active surface groups.

Accordingly, both the Langmuir and the Freundlich isotherms may be derived from the general expression for. Davis JA, Randall JD () Application of surface complexation modeling to describe uranium (VI) adsorption and retardation at the uranium mill tailings site at Naturita, Colorado.

Nuclear Regulatory Commission Office of Nuclear Regulatory Research, Washington, DC. Surface complexation models for contaminant adsorption have the potential to increase the confidence and scientific credibility of transport modeling by reducing the uncertainty in quantifying retardation and providing a means of quantifying that uncertainty.

Chemical models, such as surface complexation models, provide a molecular description of anion adsorption reactions using an equilibrium approach.

Two such models, the constant capacitance model and the triple layer model, are described in the present study. An alternative approach for modeling Cu adsorption on kaolinite was proposed by Jung et al., who used a triple layer surface complexation model assuming that Cu binds as an innersphere monodentate complex on an amphoteric aluminol site and as an outersphere monodentate complex on a deprotonatable silanol site.

subsurface. This study integrated batch experiments of U(VI) adsorption to synthetic and biogenic MnO 2, surface complexation modeling, ζ-potential analysis, and molecular-scale characterization of adsorbed U(VI) with extended X-ray absorption fine structure (EXAFS) spectroscopy.

The surface complexation model included. Surface charge and point of zero charge (PZC) Surface complexation leads to surface-charged solid surfaces.

Electric surface charges govern characteristic chemical and physical phenomena such as ion exchange, adsorption, swelling, colloidal stability, and flow behavior (Sposito, ).It is well known that the surface charges on layered silicates and insoluble oxides depend on the pH of.

@article{osti_, title = {Surface complexation modeling of arsenate adsorption on soil minerals}, author = {Manning, B A and Goldberg, S}, abstractNote = {Arsenic (As) is a toxic trace element that occurs naturally in some groundwaters of the semiarid southwestern United States and can be mobilized from soils during irrigated agricultural practices.

A Generalized Composite surface complexation model (GC-SCM) was developed for the Naturita aquifer background sediments (NABS) based on fitting batch U(VI) adsorption data. With only two surface reactions (four surface species), the GC-SCM without.

Adsorption–desorption reactions are important processes that affect the transport of contaminants in the environment. Various empirical approaches, such as the distribution coefficient and Freundlich and Langmuir isotherm equations, have been used to represent adsorption.

Surface complexation modeling (SCM) is a powerful tool to describe/predict metal and radionuclide adsorption *Author for correspondence (Email: [email protected]). onto different geological materials.

The ultimate goal for the application of SCM is to predict adsorption in multi-component systems [7]. The SCM approaches can be di. Surface complexation models have been incorporated into subsurface transport models at several fi eld sites, although simplifying assumptions are needed to deal with heterogeneous materials.

d modeling approach, the surface complexation model (SCM) accounts for variations in chemical conditions and aqueous speciation, and thus can describe spatial and temporal changes of metal and radionuclide adsorption [Waite et al., ; Pabalan et al., ; Kohler et al., ; Koretsky, ; Davis, ; Davis et al., ; Curtis et al.

Unlike the K {sub d} approach, surface complexation (SC) reactions, in conjunction with ion exchange and precipitation, can be used to describe radionuclide reactive transport as a function of changing environmental conditions. They provide a more robust basis for describing radionuclide retardation in geochemically dynamic environments.

Mass Action Expressions for Bidentate Adsorption in Surface Complexation Modeling: Theory and Practice. Environmental Science & Technology47 (9), DOI: /ese. Andrew W. Miller and Yifeng Wang. Radionuclide Interaction with Clays in Dilute and Heavily Compacted Systems: A Critical Review.(English).

Article. Abstract Available. WILLIAMSON-MA. RIMSTIDT-JD. p AR7: URANIUM INFILTRATION FROM A RIVER TO SHALLOW GROUNDWATER. (English). Article. Abstract Available. LIENERT-C. SHORT-SA.

VONGUNTEN-HR. p AR8: URANIUM(VI) ADSORPTION TO FERRIHYDRITE - APPLICATION OF A SURFACE COMPLEXATION MODEL. (English). Article. .Subsurface / 2 Occurrence of Aluminum Oxides and Hydroxides in Surface Water / 4 adsorption data on oxides with a unique model. Refusing to be intimidated by the Dzombak and Morel used a surface-complexation model with a simple solid–.