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Showing 1 to 9 of 9 for “"surface complexation modeling"”.
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Surface complexation modeling of Pb(II), Cd(II) and Se(IV) onto iron hydroxides in single and bisolute systems
… fate and transport of metal ion contaminants in surface and groundwaters. Surface Complexation Models (SCMs) have emerged as the most promising tools for predicting contaminant ion sorption to iron (hydr)oxides. The reliability of SCMs is highly dependent on the ability to select appropriate …
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Application of surface complexation modeling to the adsorption of uranium(VI) onto hematite in the presence of humic and fulvic acids, The
Includes bibliographical references (pages 154-160).
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Pore-scale processes : quantification of the controls on the transport of Ra and Cr, and development of a novel geochemical visualization tool
… sorption to minerals and organic matter, and complexation with ligands in solution. Depending on the contaminant of interest, the importance of these different processes will widely vary, and the natural heterogeneity of soil systems all further frustrate modeling of contaminant transport. …
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Application of phosphate and surfactant-modified zeolite for remediation/attenuation of trace elements in soil and coal fly ash
… leachate after SMZ treatment. Batch experiments, surface complexation modeling, and X-ray spectroscopic tools were used to elucidate the kinetics and mechanisms of arsenate (As(V)) and phosphate (Pi) adsorption on ferric hydroxide. Both oxyanions showed similar adsorptions during single-ion …
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Coupled arsenic, iron, and nitrogen cycling in arsenic-contaminated Upper Mystic Lake
… laboratory studies, and applied mass balance, surface complexation, and thermodynamic modeling to explore As cycling and its links to other elemental cycles (Fe, N, 02) in UML. Nitrate appears to control iron (Fe) and As cycling in the hypolimion of urban, eutrophic UML. In doing so, nitrate …
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Interaction of aqueous U(VI) with goethite, montmorillonite, and UO2(s)
<p>Uranium contamination in subsurface environments is a matter of great concern throughout the world. Fate and transport of uranium in the subsurface can be controlled by U(VI) adsorption and reduction onto common iron (oxy)hydroxides and clay minerals. Aqueous U(VI) can also exchange uranium …
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An Improved MUSIC Model for Gibbsite
… that have proposed MUSIC models for gibbsite surfaces have purported to achieve a very good fit with potentiometric titration data. However, in order to achieve such results, several significant parameters, such as the number of surface sites, site densities, and pKa values were sometimes …
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Competitive Adsorption of Arsenite and Silicic Acid on Goethite
The adsorption behavior of silicic acid and arsenite alone and competitively on goethite over a broad pH range (3-11) at environmentally relevant concentrations was investigated utilizing pH adsorption data and zeta potential measurements. Both addition scenarios (Si before As(III) and As(III) …
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Fate of metals in presence of minerals and mineral-organic assemblages
… sorption behavior was interpreted using surface complexation modeling (SCM). Two models (diffuse double layer and non-electrostatic) were evaluated for their ability to account for U(VI) binding to the carboxyl groups of the rhamnolipid coating as a function of the pH, total U(VI) …