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Re: PHREEQC alk & exchanger output

> My current focus, working with Jim Hendry, is developing reactive
transport models with PHREEQC for centrifugation experiments on clay
till, evaluating exchange coefficients & carbonate equilibria etc.
PHREEQC is useful to scale these experiments of diffusive-advective
transport at accelerated gravity to match solute diffusion profiles at
field scale.

> A question which I can't find addressed in FAQ:

> Is it possible to identify exchangers and alkalinity for SELECTED_OUTPUT

The alkalinity is available in the function ALK in Basic. The units are
equivalents per kilogram water. A complete list of functions is on page 127
of the manual.

10 PUNCH ALK*1000*61   # print alkalinty as HCO3

> It would be helpful to include exchanger composition
and to perform unit conversions for alkalinity etc.

Exchange species are included in the species functions, so you can get the
molality of CaX2 with the function MOL("CaX2"). Exchange species names can
also be used in the functions LA, LM, and ACT. Total number of exchange
sites is TOT("X") for the default exchange in the database.


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

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