Download FIGURE 60. A model for the indirect-leaching attack mechanism. As... metal-sulfide-attached cell of Thiobacillus ferrooxidans. Panel A is modified from...

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294
FIGURE 60. A model for the indirect-leaching attack mechanism. As catalyzed by a
metal-sulfide-attached cell of Thiobacillus ferrooxidans. Panel A is modified from Sand
et al. (1995) and shows an exaggerated exopolymer layer of the outer membrane of the
cell. The attack occurs in this outer layer between the cell and the metal sulfide grain and
is mediated by ferric iron hexahydrate (Fe(H2O)63+) and thiosulfate as an intermediate
sulfur compound. Panel B is modified from Nordstrom and Southam (1997) and shows
the bioenergetics of iron oxidation and the typical reactions that occur inside the cell.
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