> My current focus, working with Jim Hendry, is developing reactive transport models with PHREEQC for centrifugation experiments on clay till, evaluating exchange coefficients & carbonate equilibria etc. PHREEQC is useful to scale these experiments of diffusive-advective transport at accelerated gravity to match solute diffusion profiles at field scale. > A question which I can't find addressed in FAQ: > Is it possible to identify exchangers and alkalinity for SELECTED_OUTPUT with USER_PUNCH ? The alkalinity is available in the function ALK in Basic. The units are equivalents per kilogram water. A complete list of functions is on page 127 of the manual. 10 PUNCH ALK*1000*61 # print alkalinty as HCO3 > It would be helpful to include exchanger composition and to perform unit conversions for alkalinity etc. Exchange species are included in the species functions, so you can get the molality of CaX2 with the function MOL("CaX2"). Exchange species names can also be used in the functions LA, LM, and ACT. Total number of exchange sites is TOT("X") for the default exchange in the database. 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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