[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: non-convergence




> The radium01.txt runs (converge in that sense), just
give gabage results. I did remove the knobs data
block.

PHREEQC doesn't really know how to remove a solid solution completely. The
results are ok with the interpretation that when the concentrations of
each component is on the order of 1e-14 or less, the solid has completely
dissolved. In your case, barite is the predominant phase and when the
saturation index for barite drops below 0, then the solid solution is
undersaturated and does not exist. The details for the solid solution
(moles, mole fractions, etc) are garbage when the solid solution does not
exist.

I may try to add some logic on this for the printout, but unless you see
some problem with the compositions when the solid solution is present, I
think the results are alright.

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




Project Home Page
Complete Water Resources Division Software
USGS Home Page
Water Resources Division Home Page
NRP Home Page
Help Page
USGS Privacy Statement       

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: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/mail/msg00062.html
Email:dlpark@usgs.gov
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1760 since Jan 22, 1998.