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RE: Interactive PHREEQC

Define a new exchanger with a new name and it should work. X has too much
baggage in the databases. Example uses Z; any unique alphabetic string can
be used; first letter must be capital.

Z     Z+
      Z+ = Z+
          log_k = 0.0
      HCO3- + Z+ = HCO3Z
          log_k = 0.9
      TcO4- + Z+ = TcO4Z
          log_k = 0.9

EXCHANGE 1 Hypothetical ion exchanger
      HCO3Z   0.24

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

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