This example uses the phase-equilibrium, cation-exchange, and
surface-complexation reaction capabilities of PHREEQC in combination with
advective-transport capabilities to model the evolution of water in the
Central Oklahoma aquifer. The geochemistry of the aquifer has been described
by Parkhurst and others (1996). Two predominant water types occur in the
aquifer: a calcium magnesium bicarbonate water with pH in the range of 7.0
to 7.5 in the unconfined part of the aquifer and a sodium bicarbonate water
with pH in the range of 8.5 to 9.2 in the confined part of the aquifer. In
addition, marine-derived sodium chloride brines exist below the aquifer and
presumably in fluid inclusions and dead-end pore spaces within the aquifer.
Large concentrations of arsenic, selenium, chromium, and uranium occur
naturally within the aquifer. Arsenic is associated almost exclusively with
the high-pH, sodium bicarbonate water type. The example can be run using the
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