webmaster Posted December 27, 2004 Share Posted December 27, 2004 From: Brian Gibney Subject: Fe/As redox and sorption I am modeling the sorption of arsenic to Fe(OH)3 under the following circumstances: 1) Arsenic consistently oxidized, Fe redox slides from reduced to oxidized 2) Fe consistently oxidized, As redox slides from reduced to oxidized The basis for my reaction has been set up as below: hematite/Fe+++ = 1 free gram e-/O2 = 0 Eh Na = 100 mmolal Cl- = 100 mmolal (charge balance) SO4- = 10 mmolal Ca++ = 10 mmolal As(OH)4- = 0.1 mmolal H+ = 7 (pH) Reactants: react 1 g Fe(OH)3 ppd slide Eh to 1 Plots of reactions don't show a decrease in As sorption at low Eh (as iron is reduced), as one would expect. Any suggestions? Quote Link to comment Share on other sites More sharing options...
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