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SORPTION

Specifies parameters for sorption reactions.

Required Cards:

SORPTION

Opens the sorption reaction block.

Optional Cards:

ION_EXCHANGE_RXN

Sorption defined through ion exchange reactions.

ISOTHERM_REACTIONS

Sorption reactions defined by isotherms (e.g. linear, Langmuir, Freundlich).

SURFACE_COMPLEXATION_RXN

Opens surface complexation reaction block.

Examples

For a complete soil-column transport example using ion exchange, see the Ion Exchange benchmark based on the experiments of Voegelin et al. (2000).

SORPTION
  ISOTHERM_REACTIONS
    Tracer
      DISTRIBUTION_COEFFICIENT 0.25d3
    /
    Tracer2
      DISTRIBUTION_COEFFICIENT 0.5d3
      FREUNDLICH_N 1.67  ! 1/n = 0.6
    /
  /
  SURFACE_COMPLEXATION_RXN
    EQUILIBRIUM
    MINERAL Kaolinite
    SITE >FeOH 0.00636
    COMPLEXES
      >FeOHUO3
      >FeOHUO2++
    /
  /
  ION_EXCHANGE_RXN
    MINERAL Calcite
    CEC 1.e-1
    CATIONS
      Na+   1.d0 REFERENCE
      Ca++  3.38638672536d0
      Mg++  6.00240096038d0
    /
  /
END