Dear Mr.Parkhurst, Is it possible to do diffusion modeling using PHREEQC? I've tried using POLLUTE, but it doesn't do upwards diffusion. I have a laboratory diffusion cell and I am trying to model upwards diffusion of metals from the tailings into a clean overlying water cover and then estimate diffusion coefficients of metals. Initially, the water has a concentration of zero, and each day the concentration of contaminants increased in the water cover, until an equilibrium value was reached. I know the pore water and solid elemental concentrations of contaminants in the tailings. Thanks, Vicky Peacey
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