This example demonstrates the capabilities of PHREEQC to perform a series of geochemical simulations, with the final simulations relying on results from previous simulations within the same run. The example investigates diagenetic reactions that may occur in zones where seawater mixes with carbonate ground water. This example is take from the Phreeqc documentation that can be found here:

https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/html/final-72.html

Content

The example is divided into five simulations:

(A) Carbonate ground water is defined by equilibrating pure water with calcite at a of 10 -2.0 atm.
(B) Seawater is defined using the major-ion data.
(C) The two solutions are mixed together in the proportions 70 percent ground water and 30 percent seawater.
(D) The mixture is equilibrated with calcite and dolomite.
(E) the mixture is equilibrated with calcite only, to investigate the chemical evolution if dolomite precipitation is assumed to be negligible.