Hi Dave, I ran this file through PHREEQC to get a CO2 number. I wanted to plot the water on a Phase diagram which uses pCO2 , to find out if We are in the calcite or the dolomite field. at 25 deg the file was not converging, then I realized that the field temperature was 15 degs C. It runs at 15 and at every temperature up to and including 20. At 21 degrees it no longer converges. I thought this was curious. I am wondering if increasing the allowable iterations will allow convergence. Or do I recalculate the phase diagram for 15 deg C? The sample is from groundwater in a slag fill deposit in Indiana. Jorie (See attached file: slag.in)
Attachment:
slag.in
Description: Binary data
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/msg00175.html
Email:dlpark@usgs.gov
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 2940 since Jan 22, 1998.