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 349912
Title Modeling the interactions between humics, ions, and mineral surfaces
Author(s) Riemsdijk, W.H. van; Koopal, L.K.; Kinniburgh, D.G.; Benedetti, M.F.; Weng, L.P.
Source Environmental Science and Technology 40 (2006)24. - ISSN 0013-936X - p. 7473 - 7480.
Department(s) Chair Soil Chemistry and Chemical Soil Quality
Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) donnan membrane technique - natural organic-matter - chemical-equilibrium models - site binding models - fulvic-acid - heterogeneous surfaces - proton binding - affinity distributions - copper-binding - trace-metals
Abstract Model VI and the NICA-Donnan model are two successful models presently available for describing metal ion binding by humic materials. Both models deal with the complexity of the underlying processes (intrinsic heterogene ity, partial correlation between affinity distributions, variable stoichiometry, electrostatics) in a pragmatic way. The parameters of the NICA-Donnan model and their determination are discussed. The current interpretation of the ion-specific "non-ideality" parameters, ni, found in the NICA-Donnan model, emphasizes their role in determining the stoichiometry for the competitive binding of ions. The ratio nM/nH is reflected in the corresponding exchange ratios and the pH dependence of the metal ion binding. Experimental complications occur in testing models. Although Model VI and the NICA-Donnan models have much in common, there are differences that may become more apparent as the models are more widely tested. Recently ion binding to complexes of humics and oxides has been described by combining the NICA-Donnan model (ion binding to humics) with the CD-MUSIC model (ion binding to oxides). The impact of humic to oxide binding on both cation and anion binding is briefly discussed.
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