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Modeling the Transport of Metals with Rate-Limited EDTA-Promoted Extraction and Dissolution during EDTA-Flushing of Copper-Contaminated Soils

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Department of Civil Engineering, The Hong Kong University of Science and Technology, Hong Kong, China, and Department of Mathematics, The Hong Kong University of Science and Technology, Hong Kong, China
Cite this: Environ. Sci. Technol. 2007, 41, 10, 3660–3666
Publication Date (Web):April 17, 2007
https://doi.org/10.1021/es061756m
Copyright © 2007 American Chemical Society

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    Abstract

    EDTA-flushing of artificially contaminated soils enhanced Cu extraction but also induced mineral dissolution simultaneously. The mobilization and transport of these metal−EDTA complexes was investigated with column experiments. A quantitative transport model was proposed for simulating the experimental breakthrough curves of Cu, Fe, Al, and Ca. The rate-limited EDTA-promoted extraction and dissolution could be described by respective second-order kinetic terms, which were necessary for explaining the time-dependent depletion of extractable metals (sorbed and indigenous) in soils with continuous EDTA-flushing. Simultaneous simulation of extraction of sorbed Cu and dissolution of soil Fe, Al, and Ca is more conceptually accurate than individual modeling of each metal because the latter approach tends to overestimate the concentration of free EDTA during transport and thus underestimate the rate coefficients of EDTA-promoted dissolution. The fitted rate coefficients of Cu were about an order of magnitude larger than those of Fe and Al; these values probably reflect Cu extraction from weakly sorbed fractions and Fe and Al dissolution from amorphous oxides. The apparent retardation of Fe, Al, and Ca transport had to be taken into account by empirical determination, which was attributed to the metal lability in soils and thermodynamics of surface complexation.

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     Department of Civil Engineering.

    *

     Corresponding author e-mail:  [email protected]; phone:  852-2358-7157; fax:  852-2358-1534.

     Department of Mathematics.

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    EDTA-extractable amounts of Cu, Fe, Al, and Ca, calculated first-order rate coefficients, observed and simulated transport of Cu−EDTA complex alone, observed and simulated transport of all metal−EDTA complexes using first-order kinetic model, cumulative amounts of Fe and Al dissolution, and simulated and observed transport of total EDTA. This material is available free of charge via the Internet at http://pubs.acs.org.

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    24. Daniel C. W. Tsang, Irene M. C. Lo, Rao Y. Surampalli. Design, Implementation, and Economic/Societal Considerations of Chelant-Enhanced Soil Washing. 2012, 1-26. https://doi.org/10.1061/9780784412183.ch01
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    28. Irene M.C. Lo, Daniel C.W. Tsang, Theo C.M. Yip, Fei Wang, Weihua Zhang. Influence of injection conditions on EDDS-flushing of metal-contaminated soil. Journal of Hazardous Materials 2011, 192 (2) , 667-675. https://doi.org/10.1016/j.jhazmat.2011.05.067
    29. Irene M.C. Lo, Daniel C.W. Tsang, Theo C.M. Yip, Fei Wang, Weihua Zhang. Significance of metal exchange in EDDS-flushing column experiments. Chemosphere 2011, 83 (1) , 7-13. https://doi.org/10.1016/j.chemosphere.2011.01.040
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    31. Andrés Navarro, Francisco Martínez. The use of soil-flushing to remediate metal contamination in a smelting slag dumping area: Column and pilot-scale experiments. Engineering Geology 2010, 115 (1-2) , 16-27. https://doi.org/10.1016/j.enggeo.2010.07.001
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    34. Yeuk-Ki Tsoi, Kelvin Sze-Yin Leung. Simultaneous determination of seven elemental species in estuarine waters by LC-ICP-DRC-MS. Journal of Analytical Atomic Spectrometry 2010, 25 (6) , 880. https://doi.org/10.1039/b923343a
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