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Hi David,
The output from a sorption routine in PHREEQC shows
that I have a certain number of moles of selenium species sorbed to Hfo_w.
However the solution composition shows the same number of moles present after
sorption as was initially specified in the input solution. Why is there no
apparent decrease in disolved Se? Does PHREEQC consider sorbed species to
be in solution?
Also, I'm confused about the specification of sites
and surface area in the surface data block. After reading the FAQ's on the
website I have the impression that the number of surface sites is either a
number of moles of sites to which 1 kg of solution will be added (FAQ 60) or the
number of moles of sites present on 1 mole of Fe (FAQ 61). Which is
correct? If I specify the moles of a site present (and the mass of solid
if sites are related to moles of solid) why is it necessary to specify surface
area.
Thanks, Shane
Shane Matolyak
MAXIM Technologies, Inc. PO Box 1413 Bozeman, MT 59771 406-582-8780 |
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