title: Parameterization and evaluation of sulfate adsorption in a dynamic soil chemistry model.
abstract: Sulfate adsorption was implemented in the dynamic, multi-layer soil chemistry model SAFE. The process is modeled by an isotherm in which sulfate adsorption is considered to be fully reversible and dependent on sulfate concentration as well as pH in soil solution. The isotherm was parameterized by a site-specific series of simple batch experiments at different pH (3.8-5.0) and sulfate concentration (10-260 micromol 1(-1)) levels. Application of the model to the Lake Gardsj6n roof covered site shows that including sulfate adsorption improves the dynamic behavior of the model and sulfate adsorption and desorption delay acidification and recovery of the soil. The modeled adsorbed pool of sulfate at the site reached a maximum level of 700 mmol/m(2) in the late 1980s, well in line with experimental data.
authors.affiliation: Department of Chemical Engineering II, Lund University, P.O. Box 124, SE 221 00 Lund, Sweden. liisa.martinson@chemeng.lth.se
authors.forename: Liisa
authors.initials: L
authors.lastname: Martinson
authors.forename: Mattias
authors.initials: M
authors.lastname: Alveteg
authors.forename: Per
authors.initials: P
authors.lastname: Warfvinge
mesh_terms: D000327:Adsorption; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D012989:Soil Pollutants / Q000032:analysis*; D013431:Sulfates / Q000737:chemistry*; D013548:Sweden
chemical_list: D012989:Soil Pollutants; D013431:Sulfates