I'm modeling the dilution/concentration of stream solutions at 1 -> 2. Can I use the flow volume ratios at pt.1:pt. 2 to estimate solution fractions to compare against the sol'n 1:sol'n 2 fractions given in Phreeqc ? I can adjust this ratio by changing the uncertainty limit. I'm not sure about your setup. If streams A and B mix to form stream C, then yes, the mixing fractions of A and B should be approximately the relative flows of A and B. Let me know if this is a reasonable interpretation of solution fractions in your model. I've also noticed that the H2O(g) mole transfer is in the 10 to 100 range (does this limit use of the model since it is > 1 ?). You need to interpret the numbers carefully. All of the mole transfers, including water, are in moles. There are 55.5 moles H2O per kilogram, so addition of 55.5 moles of H2O would represent a dilution by a factor of 2. Mixing fractions can be interpreted as number of kilograms of water water. If H2O is removed (negative mole transfer), then it is probably the result of a mixing fraction greater than 1 for one or more of the initial solutions. There is a mole balance on H, which is essentially a mole balance on water. If you convert everything to either moles or kilograms, you will find conservation of water. David 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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