The only way that I can think of is to recalculate the pe in USER_PUNCH. The following is an example for iron. You would have to code an equation for each redox couple. David SOLUTION 1 temp 10 pH 5 pe 4 Fe(2) 1 Fe(3) 1 USER_PUNCH -heading pe_Fe(2)/Fe(3) 10 pe_fe = LA("Fe+3") - LA("Fe+2") - LK_SPECIES("Fe+3") 20 PUNCH pe_fe END David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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