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OVERRIDE_MINERAL_MASS_ACTION

Allows the user to override species and stoichiometries specified in the database with a custom formulation. This enables the use of a subset of species when calculating the mineral saturation index and affinity factor. One can also override the log Ks specified in the database.

Required Cards:

OVERRIDE_MINERAL_MASS_ACTION

Opens the block.

<string>

Specifies mineral name.

Optional Cards:

REACTION <string>

String of characters defining the new mass action equation.

LOGK <float 1> … <float N>

Log Ks that correspond to the temperatures in the database. If only one log K is specified, it is applied for all temperatures.

Examples

CHEMISTRY
  ...
  OVERRIDE_MINERAL_MASS_ACTION
    Calcite
      REACTION Calcite + H+ <-> Ca++ + 1. HCO3-
      LOGK 2.2257 1.8487 1.3330 0.7743 0.0999 -0.5838 -1.3262 -2.2154
    /
  /
  ...
END

CHEMISTRY
  ...
  OVERRIDE_MINERAL_MASS_ACTION
    Calcite
      REACTION Calcite + H+ <-> Ca++ + 1. HCO3-
    /
  /
  ...
END

CHEMISTRY
  ...
  OVERRIDE_MINERAL_MASS_ACTION
    Calcite
      LOGK 1.8487
    /
  /
  ...
END