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 326590
Title Modeling the binding of fulvic acid by goethite: The speciation of adsorbed FA molecules
Author(s) Filius, J.D.; Meeussen, J.C.L.; Hiemstra, T.; Riemsdijk, W.H. van
Source Geochimica et Cosmochimica Acta 67 (2003)8. - ISSN 0016-7037 - p. 1463 - 1474.
Department(s) Sub-department of Soil Quality
Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) natural organic-matter - nica-donnan model - humic substances - surface complexation - competitive adsorption - proton binding - hydrous oxides - ion-binding - iron-oxide - charge
Abstract Under natural conditions, the adsorption of ions at the solid-water interface may be strongly influenced by the adsorption of organic matter. In this paper, we describe the adsorption of fulvic acid (FA) by metal (hydr)oxide surfaces with a heterogeneous surface complexation model, the ligand and charge distribution (LCD) model. The model is a self-consistent combination of the nonideal competitive adsorption (NICA) equation and the CD-MUSIC model. The LCD model can describe simultaneously the concentration, pH, and salt dependency of the adsorption with a minimum of only three adjustable parameters. Furthermore, the model predicts the coadsorption of protons accurately for an extended range of conditions. Surface speciation calculations show that almost all hydroxyl groups of the adsorbed FA molecules are involved in outer sphere complexation reactions. The carboxylic groups of the adsorbed FA molecule form inner and outer sphere complexes. Furthermore, part of the carboxylate groups remain noncoordinated and deprotonated. Copyright (C) 2003 Elsevier Science Ltd.
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