Hi Jim, Hope all is well in Seattle. Here's an input file that titrates the electron acceptors with CH2O. It's split in two pieces, on adds a mmol of CH2O to use up oxygen and nitrogen and the second part titrates the iron, manganese, and sulfate. At the end, a few mmol of CH4 have been produced. A spreadsheet file "redox.sel" is created which lists some of the pertinent information. You may need to download the latest version of PhreeqcI from http://www.brr.cr.usgs.gov/projects/GWC_coupled to get teh file suffixes to automatically recognize PhreeqcI files. Take care, David (See attached file: redox.pqi) David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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