Hi David, I have a final question about surfaces in PHREEQC. I defined an organic surface for VOCs to sorb to. The three numbers that define the surface are (a) the number of moles of sites for sorption, (b) the specific surface area, and (c) the mass of the surface. However, when I explicitly define the number of moles of sites for sorption that 1L of water would partition to in an aquifer with a certain fraction of organic carbon, the other two numbers don't make a difference (I've varied them extensively and I've seen no sensitivity to those parameters). Is another way to do this? For example, can I not explicitly define the number of moles of sites for sorption and do this based on the mass and the specific surface area? Additionally, how does PHREEQC treat the K given for the sorption reaction? As always, thanks so much for your help! Margaret
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