Dear Dr. Parkhurst, Currently, I am working on modeling geochemistry for the acid sulfate soil in Thailand and I am intersted in using the PHREEQC inverse modeling to come up with amount of mass transfer between an upper (upgradient) and a lower (downgradient) locations. they both are in the same flowpath as teh water infiltrates downward. However, both locations are in the unsat zone. I am wondering if PHREEQC will be applicable in this case. I really appreaciate your help. Uma Seeboonruang
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