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Re: PHREEQC problem

> The problem is that  in the input file I say that the F- concentration
should be 5e-6, but when PHREEQEC is calculating the F- concentration
becomes 5.232e-006.

You are entering mol/L and PHREEQC is converting the concentrations to
mol/kg water. You have concentrations of about 1 mol/L for some
constituents and the conversion to mol/kg water involves density (assumed
1.0) and subtracting the mass of the solutes to find the mass of water. The
concentrations in mol/kgw are calculated by dividing by the calculated mass
of water.

If you set the units to mol/kgw, no conversion will be necessary.


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

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