Submitted to: Soil Science Society of America Special Publication Book Chapter
Publication Type: Review Article
Publication Acceptance Date: April 21, 2003
Publication Date: June 24, 2005
Citation: Goldberg, S.R. 2005. Equation and models describing adsorption processes in soils. In: Chemical Processes in Soils. M.A.Tabatabai and D.L. Sparks, (eds.) Soil Science Society of America Special Publication Book Series. Madison, WI. Chapter 10 pp:489-517. Interpretive Summary: Not required.
Technical Abstract: Adsorption reactions lead to a loss of a chemical species from solution and its surface accumulation. Adsorption reactions can be described by various empirical and chemical models. Empirical models include: the distribution coefficient, the Freundlich adsorption isotherm, and the Langmuir adsorption isotherm. Surface complexation models are chemical models and include: the constant capacitance model, the diffuse layer model, and the triple layer model. These empirical and chemical models are discussed. Adjustable parameters in the surface complexation models are: surface site density, capacitance densities, and surface complexation constants. Methods of obtaining these parameters as well as the numerical solution of the equilibria posed with surface complexation models are presented. Limitations in application of surface complexation models to soil systems are indicated.