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natasha543

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Everything posted by natasha543

  1. Hi all, I'm trying to calculate A and B using the expression given in Helgeson(1969). The values I get seem to be quite off from the values given in the database and in Helgeson(1969). I think it's because my water density and dielectric constant calculations are wrong. Does anyone know what water densities and dielectric constants (as a function of temperature) were used to calculate A(T) and B(T) in thermo.dat? Also, I notice in thermo.dat that B(T) is tabulated without a factor of 10^8. Is this factored in by GWB or am I misunderstood in thinking that the coefficients B have a magnitude of 10^8? Many thanks, Natasha
  2. Thank you very much, Brian. This helped a lot. Natasha
  3. I am trying to use Spece8 to calculate activities using the Bdot model. I have in situ data of chemical composition. I'm altering the Debye-Huckel coefficients for different temperatures. I am only going to use geochemists workbench to calculate the log(a) values for these species. I notice that logK values don't appear in the Bdot equations. So my question is, would I need to go through and alter all the logK values for the secondary species and redox reactions in thermo.dat? Are these logK values important in the Bdot model? Many thanks, Natasha
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