Adsorption of fulvic acid on goethite

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 r...

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Bibliographic Details
Published inGeochimica et cosmochimica acta Vol. 64; no. 1; pp. 51 - 60
Main Authors Filius, Jeroen D., Lumsdon, David G., Meeussen, Johannes C.L., Hiemstra, Tjisse, Van Riemsdijk, Willem H.
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 2000
Subjects
ADSORPTION
AQUATIC ECOSYSTEMS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL SCIENCES
FULVIC ACIDS
GOETHITE
IONIC CONDUCTIVITY
PH VALUE
Sectie Bodemkwaliteit
SORPTIVE PROPERTIES
Sub-department of Soil Quality
WIMEK
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Summary: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.
ISSN:0016-7037
1872-9533
DOI:10.1016/S0016-7037(99)00176-3