Abstract
One approach to describing sorption phenomena in transport processes in soils is the assumption of simultaneous equilibria for several chemical reactions with solubility of minerals and ion exchange replacing “sorption”. The paper presents a technique for the transformation of chemical reactions (assumed to be in equilibrium) into mathematical equations and for the numerical calculation of the equilibrium concentrations from these equations. The presentation is built upon an example of a model for an acid soil including solubility of aluminiumhydroxide, Al-complexes and ion exchange.
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