J. Prenzel, SULFATE SORPTION IN SOILS UNDER ACID DEPOSITION - COMPARISON OF 2 MODELING APPROACHES, Journal of environmental quality, 23(1), 1994, pp. 188-194
Soil acidification under the impact of acid deposition Is often modele
d by adsorption isotherms. The assumption of solubility equilibria for
basic Al sulfates is an alternative modeling approach. Similarities a
nd differences between both concepts are discussed. A simple solubilit
y equilibrium model is defined and used to demonstrate that the second
model can explain results that are well describef by typical adsorpti
on isotherms. The same model can also explain a pH dependency of adsor
ption isotherms that has been widely reported. In the application to a
ssumed soil acidification scenarios, predictions Pre presented that co
uld not be described by an adsorption isotherm approach.