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Predicting sulphate...
Predicting sulphate adsorption/desorption in forest soils : Evaluation of an extended Freundlich equation
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- Gustafsson, Jon Petter (author)
- Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Swedish University of Agricultural Sciences, Sweden,Institutionen för mark och miljö,Department of Soil and Environment
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- Akram, Muhammad (author)
- KTH,Mark- och vattenteknik
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- Tiberg, Charlotta (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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(creator_code:org_t)
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- Elsevier, 2015
- 2015
- English.
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In: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 119, s. 83-89
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- Sulphate adsorption
- Spodosols
- Acidification
- Freundlich
- pH
Publication and Content Type
- ref (subject category)
- art (subject category)
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