> You have solved my problem, but the question still remains: How does PHREEQC recognize a reductant in the CH2O (this compound had not been defined in database)? Does PHREEQC check a valency of each element? PHREEQC simply increments the total number of moles of C, H, O in the aqueous phase by the amount defined by the formula and reaction amount given in REACTION. In other words, it parses the formula that you give it for the elements and element stoichiometry and then adds these to the solution in the specified amounts. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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