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Re: Phreeqci

I am unsing Phreeqci under Windows98, PIII/1000MH, 128 M RAM,
and I am having a couple of problems:
> 1) After running a case, when the last time step is reached, the
calculations stops and then it tries automatically to open the newly
generated output file, but it last a lot, a very long period of time
(several minutes trying to open the file) and often it hungs the program
(not responding...).

Are you running a transport problem? It could be that the output file is
very large and your system is having trouble with it. You can limit the
data that is written to the output file with -print_cells and

> 2) In the input file I have defined a Kinetics bloc and a Rates bloc in a
batch simulation. A very single 1st order kinetic law is defined but often
the program hungs because it does not converge. It is very strange because
the final concentration is only the half of the initial, the time steps are
very small (1 second),....I am not able to get than the simulation go
farther (seversl days) and the final concentration several orders of
magnitude smaller than the initial.

The time step for kinetics is defined either in the KINETICS data block or
the TRANSPORT (or ADVECTION) data block, depending on the type of
simulation you are running. The value is defined in seconds. The default
value is 1 second. Sounds like you may be using the default value and
should define your own time step.

If these suggestions don't help, please send the input file (and the
database file if it is different from the database files distributed with
PhreeqcI). I'll take a look at it.


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

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