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
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