----- Original Message ----- From: "David L Parkhurst" <dlpark@xxxxxxxx> To: "Bernd Ehret" <bernd.ehret@xxxxxxxxxxxxx> Sent: Thursday, June 28, 2001 4:33 PM Subject: Re: Transport problem > David > > > David Parkhurst (dlpark@xxxxxxxx) > U.S. Geological Survey > Box 25046, MS 413 > Denver Federal Center > Denver, CO 80225 > Thank you very much for your information. It's a pity but there are always some more questions: 1) identifier -alkalinity in SELECTED_OUTPUT o.k. 2) > Both versions appear to be consistent in calculating a pH of 10. I believe > the program is making the proper calculation for the conditions that you > have specified. You need to look at the changes in the distribution of > species for the surface complexes to see what is causing the high pH > values. It is probably related to the selection of log K values for the > surface complexes and the initial conditions. I have done the calculation without surface complexes - and there are the same results for pH and only very small differences for concentrations in cell 20 shift 20, see excel sheets. Bernd bernd.ehret@xxxxxxxxxxxxx ehbernd@xxxxxx
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