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David,
Thanks for your recent help on executing
phreeqci.
I have another problem that I hope you can help me with:
I have mixed a groundwater with 129 ppm SO4-2 (specified as S) with
Fe_metal and observed that the water reaches saturation with respect to several
Fe oxide and sulfide phases and as well as As2S3. As expected, pe drops
like a rock. Magenite has the greatest degree of saturation of the Fe
phases.
Allowing magnetite, pyrite, and orpiment to "exist" shows that
only magnetite ppts, leaving pH high but perhaps unrealistically high
(12+) so that HS- is trivial relative to other S species
and the sulfides do not form.
Do I need to define reactions for the other S species and the
orpiment, pyrite, etc.?
Also, can you comment on reaction precipitation
sequence?
Thanks,
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