Abstract
The intersection of adsorption-pH curves for phosphate and arsenate by variable charge soils were observed at different ionic strengths (a characteristic pH). Above this pH, the adsorption of the two anions increased with increasing ionic strength, whereas below it the reverse trend occurred. Under the acidic conditions, Cu(II) adsorption by goethite and γ-Al2O3 also increased with the increasing ionic strength. The change of the adsorption plane potential on variable-charge soils and Fe/Al oxides with ionic strength was responsible for the variation of specific adsorption of the anions and Cu(II). The zeta potential of soil colloids and Fe/Al oxides changed with ionic strength as an opposite trend to their surface charges. This gave an experimental proof to support the interpretation.
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References
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© 2010 Zhejiang University Press, Hangzhou and Springer-Verlag Berlin Heidelberg
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Xu, R., Jiang, J., Cheng, C. (2010). Effect of Ionic Strength on Specific Adsorption of Ions by Variable Charge Soils: Experimental Testification on the Adsorption Model of Bowden et al. . In: Xu, J., Huang, P.M. (eds) Molecular Environmental Soil Science at the Interfaces in the Earth’s Critical Zone. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05297-2_24
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DOI: https://doi.org/10.1007/978-3-642-05297-2_24
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