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