David, Hello from Seattle. We are teaching Environmental Chemical Modeling at UW again this year and featuring PHREEQC again. I'm wondering how you would go about setting up a sequential redox problem where you have some initial concentrations of O2, NO3, MnO2, FeOOH, SO4 and organic matter as Solution 1 and you let the organic matter react sequentially with O2, NO3, MnO2, FeOOH and SO4. Then you would follow with reaction progress the concentrations of the O2, NO3, Mn2+, Fe2+ SO4, HS- and possibly CH4. You could also follow pe with reaction progress. This sequence come up all the time in sediments and groundwater and you must have done something like this already. Best wishes, Jim Murray ********************************************************************************* James W. Murray Phone (206) 543-4730 School of Oceanography Fax (206) 685-3351 Box 357940 jmurray@xxxxxxxxxxxxxxxx University of Washington Room 413 Ocean Sciences Building Seattle WA 98195-7940 :) Home Page: http://www.ocean.washington.edu/people/faculty/jmurray/jwmhome.html *********************************************************************************
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