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RE: Release of PHREEQC 2.7 and PhreeqcI

Dr. Parkhurst:

I am trying to use PHREEQC to simulate the formation of green rust (iron
corrosion product). Its foumula is considered to be Fe4Fe2(OH)12SO4------the
first Fe is in 2nd valence and the second Fe is in 3rd valence (So I might
write it as Fe(II)4Fe(III)2(OH)12SO4. But the PHASE data block in PHREEQC
seems only to accept single valent element on left hand side. I thought of
SOLID-SOLUTION but the green rust is not yed considered as any aggregate of
other phases. I don't know if there is any other way to handle this problem.

the reaction equation is:

Fe4Fe2(OH)12SO4 = 5Fe(OH)2 + Fe2+2 + SO4-2 + 1/2O2 + H2O

Thanks a lot for your help.

Yong Wang @BU

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