Sorption of heavy metals and organic pollutants on natural
materials can be described by linear, Freundlich, or Langmuir isotherms. All
three isotherms can be calculated by PHREEQC, as shown in this example for
Cd+2 sorbing on a loamy soil (Christensen, 1984; Appelo and Postma, 2005). A
more mechanistic approach, also illustrated here, is to model the
distribution of Cd+2 over the sorbing components in the soil, in this case,
in and on organic matter, clay minerals, and iron oxyhydroxides. The example
can be run using the
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