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Predicting sulphate adsorption/desorption in forest soils: Evaluation of an extended Freundlich equation
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Swedish University of Agricultural Sciences, Sweden.ORCID iD: 0000-0001-8771-7941
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2015 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 119, p. 83-89Article in journal (Refereed) Published
Abstract [en]

Sulphate adsorption and desorption can delay the response in soil acidity against changes in acid input. Here we evaluate the use of an extended Freundlich equation for predictions of pH-dependent SO4 adsorption and desorption in low-ionic strength soil systems. Five B horizons from Spodosols were subjected to batch equilibrations at low ionic strength at different pHs and dissolved SO4 concentrations. The proton coadsorption stoichiometry (eta), i.e. the number of H+ ions co-adsorbed for every adsorbed SO42- ion, was close to 2 in four of five soils. This enabled the use of a Freundlich equation that involved only two adjustable parameters (the Freundlich coefficient K-F and the non-ideality parameter m). With this model a satisfactory fit was obtained when only two data points were used for calibration. The root-mean square errors of log adsorbed SO4 ranged from 0.006 to 0.052. The model improves the possibility to consider SO4 adsorption/desorption processes correctly in dynamic soil chemistry models.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 119, p. 83-89
Keyword [en]
Sulphate adsorption, Spodosols, Acidification, Freundlich, pH
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-161630DOI: 10.1016/j.chemosphere.2014.05.067ISI: 000347739600012PubMedID: 24972174Scopus ID: 2-s2.0-84919712850OAI: oai:DiVA.org:kth-161630DiVA, id: diva2:797636
Funder
Swedish Research Council Formas, 2011-1691
Note

QC 20150324

Available from: 2015-03-24 Created: 2015-03-13 Last updated: 2017-12-04Bibliographically approved

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