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> In the meantime, do you know of any papers or texts which provide
simplified instructions for PHREEQC operation?

Some day, I guess I should write some documentation that is simpler. We may
eventually write some wizards that lead you through some of the common
modeling situations. For now, you have to struggle with the manual or work
from the examples.

> Is there a chat-room or other internet site where I could ask specific
questions regarding the programme?  I would specifically like a detailed
explanation of how the code calculates pH using forward-modeling

Here the manual may help. There is a description of the aqueous charge
balance equation. Basically pH is adjusted to attain charge balance (or
maintain a charge imbalance from the initial solution) in forward modeling.
It gets more complicated if surface complexation (without the diffuse layer
calculation) is included.


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

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