Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 384821
Title Chemodynamics of aquatic metal complexes: From small ligands to colloids
Author(s) Buffle, J.; Leeuwen, H.P. van
Source Environmental Science and Technology 43 (2009)19. - ISSN 0013-936X - p. 7175 - 7183.
DOI https://doi.org/10.1021/es900894h
Department(s) Physical Chemistry and Colloid Science
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2009
Keyword(s) debye-huckel theory - dynamic speciation - physicochemical parameters - humic substances - bio interfaces - outer-sphere - kinetics - flux - adsorption - binding
Abstract Recent progress in understanding the formation/dissociation kinetics of aquatic metal complexes with complexants in different size ranges is evaluated and put in perspective, with suggestions for further studies. The elementary steps in the Eigen mechanism, i.e., diffusion and dehydration of the metal ion, are reviewed and further developed. The (de)protonation of both the ligand and the coordinating metal ion is reconsidered in terms of the consequences for dehydration rates and stabilities of the various outer-sphere complexes. In the nanoparticulate size range, special attention is given to the case of fulvic ligands, for which the impact of electrostatic interactions is especially large. In complexation with colloidal ligands (hard, soft, and combination thereof) the diffusive transport of metal ions is generally a slower step than in the case of complexation with small ligands in a homogeneous solution. The ensuing consequences for the chemodynamics of colloidal complexes are discussed in detail and placed in a generic framework, encompassing the complete range of ligand sizes
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