Adsorption of fulvic acid on goethite
Identifieur interne : 002010 ( Main/Exploration ); précédent : 002009; suivant : 002011Adsorption of fulvic acid on goethite
Auteurs : Jeroen D. Filius [Pays-Bas] ; David G. Lumsdon [Royaume-Uni] ; Johannes C. L. Meeussen [Royaume-Uni] ; Tjisse Hiemstra [Pays-Bas] ; Willem H. Van Riemsdijk [Pays-Bas]Source :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1999.
Abstract
The adsorption of fulvic acid by goethite was determined experimentally as a function of concentration, pH, and ionic strength. The data were described with the CD-MUSIC model of Hiemstra and Van Riemsdijk (1996), which allows the distribution of charge of the bound fulvate molecule over a surface region. Simultaneously, the concentration, pH, and salt dependency of the binding of fulvic acid can be described. Using the same parameters, the basic charging behavior of the goethite in the absence of fulvic acid could be described well. The surface species used in the model indicate that inner sphere coordination of carboxylic groups of the fulvate molecule is important at low pH, whereas at high pH the outer sphere coordination with reactive groups of the fulvate molecule with high proton affinity is important.
Url:
DOI: 10.1016/S0016-7037(99)00176-3
Affiliations:
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The data were described with the CD-MUSIC model of Hiemstra and Van Riemsdijk (1996), which allows the distribution of charge of the bound fulvate molecule over a surface region. Simultaneously, the concentration, pH, and salt dependency of the binding of fulvic acid can be described. Using the same parameters, the basic charging behavior of the goethite in the absence of fulvic acid could be described well. The surface species used in the model indicate that inner sphere coordination of carboxylic groups of the fulvate molecule is important at low pH, whereas at high pH the outer sphere coordination with reactive groups of the fulvate molecule with high proton affinity is important.</div></front></TEI><affiliations><list><country><li>Pays-Bas</li><li>Royaume-Uni</li></country></list><tree><country name="Pays-Bas"><noRegion><name sortKey="Filius, Jeroen D" sort="Filius, Jeroen D" uniqKey="Filius J" first="Jeroen D." last="Filius">Jeroen D. 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