Abstract
Competitive sorption and transport of cations plays a key role in soil fertility, contaminant displacement, and colloid mobilization in soils and sediments. Understanding the movement of cations in heterogeneous, natural porous media is, therefore, of great importance. Typically, many different cations are present in such systems and they compete with each other for binding sites. Competitive cation binding can lead to quite complex transport phenomena in such multicomponent systems. Our objective was to investigate the competitive binding of three major cations (Ca 2+, Mg 2+, and Na +) in a natural soil material and to predict multicomponent transport from competitive binary and ternary adsorption isotherms. Various single-site and multiple-site models based on competitive Langmuir or cation exchange equations were tested.
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