Talk:Acid sulfate soil

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Soil Low‑importance

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Assessment

Seems like a good time to tag this article, as it's starting to look quite good. I've provisionally rated it as Start-Class on the assessment scale. ropable 00:15, 27 June 2007 (UTC)[reply]

ASS remediation/restoration

I'd like to expand the section on rehabilitation. I'll have a hunt around for references and case studies in the next couple of days. ropable 01:21, 4 July 2007 (UTC)[reply]

Jes Sammut is currently doing remediation work in Indonesia for post-Tsunami reconstruction of the Shrimp farming. You might like to look at it. Sippawitz (talk) 23:13, 21 May 2008 (UTC)[reply]

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Reaction Check

Came across this article while doing some research. Something seems a little off about the stoichiometry listed for the oxidation of pyrite reaction listed.

As listed in the article, the reaction is 2 FeS2 + 9 O2 + 4 H2O → 8 H(+) + 4 SO4(2-) + 2 Fe(OH)3

However, the hydrogen atoms are not balanced in this equation. Building from the half reactions below, I come up with something slightly different:

Oxidation Fe(2+) → Fe(3+) + 1 e(-)

S2(2-) → 2 S(6+) + 14 e(-)

Combine these into one oxidation equation to get: FeS2 → Fe(3+) + 2 S(6+) +15 e(-)

Reduction O2 + 4 e(-) → 2 O(2-)

Total Reaction 4 FeS2 + 15 O2 → 4 Fe(3+) + 8 S(6+) + 30 O(2-)

And add in water for aqueous conditions to get the final net equation (we need 44 oxygens total on the right side to convert all Fe(3+) to Fe(OH)3 and S(6+) to SO4(2-), and we have 30 oxygen atoms already, so we just need to add 14 H2O to the left side and add H+ on the right to balance the hydrogens):

4 FeS2 + 15 O2 + 14 H2O → 4 Fe(OH)3 + 8 SO4(2-) + 16 H(+)

A quick google scholar search reveals several highly cited and reputable articles that support this stoichiometry (e.g. R. Lowson, Chem. Rev., 1982, 82 (5), pp 461–497). If there's nothing I'm missing, perhaps someone with the knowledge to edit the article with proper formatting can fix it.

Best Regards,

KB