Components or Exchanges

When more than one adsorbed species or more than two ion-exchanged species interact in some manner, equilibrium becomes more complicated. Usually, thermodynamics provides a sound basis for prediction. 

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Some of the ions could be retarded by soil components or exchanged with soil and rock, and these changes might differ locally. 

For small systems involving three or fewer components (or exchanging pools in the instance of kinetic models) the solution to Eq. (2) can be mapped analytically from its exponential form... 

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