Jump to content

[OLD] Fe/As redox and sorption


webmaster
 Share

Recommended Posts

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?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...