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Predicting sulphate adsorption/desorption in forest soils: evaluation of an extended Freundlich equation

Gustafsson (forward), Jon Petter and Akram, Muhammad and Tiberg, Charlotta (2015). Predicting sulphate adsorption/desorption in forest soils: evaluation of an extended Freundlich equation. Chemosphere. 119, 83-89
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Official URL: http://dx.doi.org/10.1016/j.chemosphere.2014.05.06...

Abstract

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. (C) 2014 Elsevier Ltd. All rights reserved.

Authors/Creators:Gustafsson (forward), Jon Petter and Akram, Muhammad and Tiberg, Charlotta
Title:Predicting sulphate adsorption/desorption in forest soils: evaluation of an extended Freundlich equation
Series/Journal:Chemosphere (0045-6535)
Year of publishing :2015
Depositing date:1 July 2015
Volume:119
Page range:83-89
Number of Pages:7
Publisher:Elsevier
ISSN:0045-6535
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P33 Soil chemistry and physics
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Agrovoc terms:sulphates, spodosols, acidification, soil pH, forest soils
Keywords:Sulphate adsorption, Spodosols, Acidification, Freundlich, pH
URN:NBN:urn:nbn:se:slu:epsilon-e-2772
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2772
Additional ID:
Type of IDID
Web of Science (WoS)000347739600012
DOI10.1016/j.chemosphere.2014.05.067
ID Code:12356
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:01 Jul 2015 08:17
Metadata Last Modified:24 Jun 2016 23:15

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