Soil organic matter, local sorption isotherms

These divisions may each involve several sorption mechanisms, but if they yield a local reaction that can be accurately described with an appropriate isotherm model, they can be incorporated in equation 2. The behavior and resulting local isotherm forms for three major classes of reactions will be examined here sorption by evolutionally immature soil organic matter sorption by natural mineral phases and sorption by diagenetically altered and evolutionally mature organic matter. 

Distributed Reactivity Model. Isotherm relationships observed for natural systems may well be expected to reflect composite sorption behavior resulting from a series of different local isotherms, including linear and nonlinear adsorption reactions. For example, an observed near-linear isotherm might result from a series of linear and near-linear local sorption isotherms on m different components of soft soil organic matter and p different mineral matter surfaces. The resulting series of sorption reactions, because they are nearly linear, can be approximated in terms of a bulk linear partition coefficient, KDr that is... 

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