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 441292
Title Factors Controlling Phosphate Interaction with Iron Oxides
Author(s) Weng, L.P.; Riemsdijk, W.H. van; Hiemstra, T.
Source Journal of Environmental Quality 41 (2012)3. - ISSN 0047-2425 - p. 628 - 635.
Department(s) Chair Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) surface structural approach - donnan model parameters - charge-distribution - ion adsorption - humic substances - water interface - phosphorus loss - organic-matter - fulvic-acid - by-products
Abstract Factors such as pH, solution ion composition, and the presence of natural organic matter (NOM) play a crucial role in the effectiveness of phosphorous adsorption by iron oxides. The interplay between these factors shows a complicated pattern and can sometimes lead to controversial results. With the help of mechanistic modeling and adsorption experiments, the net macroscopic effect of single and combined factors can be better understood and predicted. In the present work, the relative importance of the above-mentioned factors in the adsorption of phosphate was analyzed using modeling and comparison between the model prediction and experimental data. The results show that, under normal soil conditions, pH, concentration of Ca, and the presence of NOM are the most important factors that control adsorption of phosphate to iron oxides. The presence of Ca not only enhances the amount of phosphate adsorbed but also changes the pH dependency of the adsorption. An increase of dissolved organic carbon from 0.5 to 50 mg L-1 can lead to a >50% decrease in the amount of phosphate adsorbed. Silicic acid may decrease phosphate adsorption, but this effect is only important at a very low phosphate concentration, in particular at high pH.
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