EXCHANGE_SPECIES

To define a half reaction and relative mass action constant for each exchange species. In general, EXCHANGE_SPECIES is used in the file with the thermodynamic database, but additional information can be stored in the input file phreeqc.in. A specific block is available in the HYDRUS-1D GUI to provide additional thermodynamic data (Solute Transport – HP2 Definition: Additions to Thermodynamic Database).

EXCHANGE_SPECIES

association reactions

log_k

delta_h

-analytical_expression

-gamma

-davies

-no_check

-mole_balance

-add_constant

-add_logk

association reaction      association reaction for an exchange species. The defined species is the first species at the right hand side of the equal sign.

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