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PHREEQC Question

Dr. Parkhurst:
I want to simulate the movement of an acidic water through a calcite-bearing soil and graphically illustrate the "banding" that one would see as Fe and Al hydroxides, and thereafter Mn oxides, precipitate.  But I am not sure how to setup the advection block to output the correct data to the selected output file.  I should be able to do this with one cell, and move progressived pore volumes through.  Somehow I need to graphically display the amount of mineral versus a "distance" rather than a pore volume ( i think).  One thing I have done is produced a titration curve where I reacted calcite with the water in increments, and indeed it shows Fe and Al precipitating before Mn.  But, it would be nice to have a "depth versus mineral concentration" plot that shows the banding I have observed in the field.  Can you provide any suggestions?  Thank you.
David B. Levy, Ph.D.
Summit Geoscience
3200 Azalea No. F4
Fort Collins, CO 80526
(970) 493-8600

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