You are generating a negative iron concentration with your MIX 88 definition: Fe 1 -.0013 3.3e-3 2 0 3 .0705 1.2e-5 95 .9307 4.6e-8 Calculated iron concentration is -3.3e-6. If Equilibrium_phases 2 had 3.3e-6 or more of Fe(OH)3(a), the program would add sufficient iron to make a nonnegative concentration. However, the moles of Fe(OH)3(a) is 0 and the system as a whole has a negative amount of iron. The program quits. It does appear to be a bug in PhreeqcI. It should give the message "Negative concentration in system." and return to the main screen of PhreeqcI. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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 1196 since Jan 22, 1998.