> 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
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1915 since Jan 22, 1998.