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Re: bernd 09-10-01

You are generating a negative iron concentration with your MIX 88

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


David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

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