Factors Controlling Phosphate Interaction with Iron Oxides
| Autor: | Liping Weng, Tjisse Hiemstra, Willem H. van Riemsdijk |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Environmental Engineering
Bodemscheikunde en Chemische Bodemkwaliteit Inorganic chemistry ion adsorption Management Monitoring Policy and Law Ferric Compounds phosphorus loss Phosphates Water Purification Ion chemistry.chemical_compound Adsorption Dissolved organic carbon Molecule Magnesium Organic matter surface structural approach Silicic acid Waste Management and Disposal by-products organic-matter Water Science and Technology chemistry.chemical_classification WIMEK Molecular Structure Sulfates humic substances Silicon Compounds charge-distribution Hydrogen-Ion Concentration Phosphate Pollution water interface Bicarbonates donnan model parameters Models Chemical chemistry Calcium Composition (visual arts) fulvic-acid Water Pollutants Chemical Soil Chemistry and Chemical Soil Quality |
| Zdroj: | Journal of Environmental Quality 41 (2012) 3 Journal of Environmental Quality, 41(3), 628-635 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2011.0250 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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