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PREFACTOR¶
Specifies coefficients for defining prefactors in mineral precipitation-dissolution reactions.
Required Cards:¶
- PREFACTOR_SPECIES <string>
Name of prefactor species. Appears as subscripts j and i in above equation corresponding to primary and secondary species.
- RATE_CONSTANT <float> <optional units_string>
Kinetic rate constant associated with prefactor species (see MINERAL_KINETICS). (default units [mol/m2/sec])
Optional Cards:¶
- ACTIVATION_ENERGY <float>
Activation energy associated with rate constant
. [J/mol]- ALPHA <float>
parameter in above equation.- BETA <float>
parameter in above equation.- ATTENUATION_COEF <float>
in above equation.
Examples (data from Palandri and Kharaka (2004))¶
CHEMISTRY ... MINERAL_KINETICS K-Feldspar PREFACTOR RATE_CONSTANT -12.41d0 mol/m^2-sec ACTIVATION_ENERGY 38.d0 / PREFACTOR RATE_CONSTANT -10.06d0 mol/m^2-sec ACTIVATION_ENERGY 51.7d0 PREFACTOR_SPECIES H+ ALPHA 0.5d0 / / PREFACTOR RATE_CONSTANT -21.20 mol/m^2-sec ACTIVATION_ENERGY 94.1d0 PREFACTOR_SPECIES H+ ALPHA -0.823d0 / / / / ... END