There's not really a good way to account for pressure in PHREEQC. The effect is relatively small, on the order of .1 log units in K. You can find the partial molal volumes and correct the log K of calcite, but to do it right, you would have to correct all the K's for all the aqueous species. Probably all you can do is adjust the calcite K and throw a little uncertainty into your interpretation. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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