Modeling of Sulfate Adsorption on Andisols for Implementation in the SAFE Model
- Tamon Fumoto* and
- Harald Sverdrup
Sulfate adsorption models were investigated in this study to simulate the pH dependence of SO2−4 and H+ adsorption on Andisols and thereby show the effects on acidification and recovery processes of Andisols. An extended constant capacitance model (ECCM), which assumed protonation of surface -OH groups and outer-sphere complexation of SO2−4, proved valid to simulate SO2−4 and H+ adsorption on Andisols when evaluated using batch experiment data of SO2−4 and base cation adsorption at pH 4 to 5 and low ionic strengths. According to the ECCM calculation, SO2−4 adsorption was reproduced by an empirical equation using SO2−4 and H+ concentrations and H+ adsorption was approximated by another empirical equation using pH and SO2−4 adsorption. Since these two empirical equations are quite simple, they will be an efficient SO2−4 adsorption submodel in SAFE, the dynamic soil chemistry model to simulate the soil acidification and recovery processes.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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