Tejaswi,

Eh will not be important for the dissolution/precipitation of calcite or
fluorite. You can look up an average value from a textbook such as The
Geochemistry of Natural Waters by Drever, or Water Chemistry by Stumm and
Morgan. If your water is continental groundwater, you can assume a density
of 1.0 g/cm3. Is a good assumption.

The model I have used is a more recent version, PHREEQCI, which has a
friendly user interface that makes it easier to input the data.

Best,

Luis E Marin



De: hydrologymodel@...
[mailto:hydrologymodel@...] En nombre de Tejaswi
Enviado el: Lunes, 19 de Octubre de 2009 09:07 a.m.
Para: gw model; hyd forum; hydrology model
Asunto: [hydrologymodel] Need Help - WATEQ4F

Dear Members,

I have recently downloaded the WATEQ4F software and I primarily intend to
calculate the Saturation Indices of some minerals, especially that of
calcite and fluorite.

I have the following doubts;

1) I dont have (not calculated) Eh values for my ground water samples. So,
what should be the iTenput value in Eh column? Whether it should be 0 or 9?

2) I have not measured the density of my water samples? So, what value
should I input under the Density column?

3) What should be the input value for Ehopt 1 to Ehopt 9? I dont have these
values?

Kindly help.

Thanks and regards;
Tejaswi