Example 4–Evaporation and Homogeneous Redox Reactions
Evaporation is accomplished by removing water from the chemical
system. Water can be removed by several methods: (1) water can be specified
as an irreversible reactant with a negative reaction coefficient in the
REACTION keyword input, (2) the solution can be mixed with pure water which
is given a negative mixing fraction in MIX, or (3) "H2O" can be specified as
the alternative reaction in EQUILIBRIUM_PHASES keyword input, in which case
water is removed or added to the aqueous phase to attain equilibrium with a
specified phase. This example uses the first method; the REACTION data block
is used to simulate concentration of rainwater by approximately 20-fold by
removing 95 percent of the water. The resulting solution contains only about
0.05 kg of water. In a subsequent simulation, the MIX keyword is used to
generate a solution that has the same concentrations as the evaporated
solution, but has a total mass of water of approximately 1 kg. The example
can be run using the phrRunString routine.
phrLoadDatabaseString(phreeqc.dat) phrSetOutputStringsOn(TRUE) phrRunString(ex4) phrGetOutputStrings()
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