Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
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<strong>Environmental</strong> <strong>Geochemistry</strong>DM Sherman, University of Bristol2007/2008Fe 2+ Oxidation facilitated by BacteriaThiobacillus ferrooxidansis the most importantbacteria that facilitates theoxidation of pyrite bygenerating Fe 3+ 4Fe 2+ (aq) + O 2 + 4H + → 4Fe 3+ (aq) + 4H 2 OThiobacillus ferrooxidans is acidophillic, autotropic <strong>and</strong>fixes its carbon from atmospheric CO 2 .Kinetics of Pyrite Oxidation by Fe 3+ FeS 2 (aq) + 14Fe 3+ (aq) + 8H 2 O(l) →15Fe 2+ (aq) + 2SO 42-(aq) + 16H + (aq)rate (moles/m 2 -s) = 10 !8.58 [Fe 3+ ] 0.3[Fe 2+ ] 0.47 [H ] 0.32At pH 2.0 with [Fe] tot = 10 -2 <strong>and</strong> [Fe 2+ ]/[Fe 3+ ] = 0.01,t 1/2 = 150 days for 0.05m 2 /g.Page 6
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