Sulfide minerals oxidation

Gleisner, M. and Herbert, R.B. Jr. (2002) Sulfide mineral oxidation in freshly processed tailings batch experiments. 

Wunderly M. D., Blowes D. W., Frind E. O., and Ptacek C. J. (1996) Sulfide mineral oxidation and subsequent reactive transport of oxidation products in mine tailings impoundments a numerical model. Water Resour. Res. 32, 3173-3187. 

Nordstrom D. K. and Southam G. (1997) Geomicrobiology of sulfide mineral oxidation. In Geomicrobiology Interactions between Microbes and Minerals, (eds. J. E. Banfield and K. H. Nealson). Mineralogical Society of America, Washington, DC, vol. 35, 361—390. 

Impact of bacteria on the rate of sulfide-mineral oxidation... 

Sulfide-mineral oxidation by microbial populations has been postulated to proceed via direct or indirect mechanisms (Tributsch and Bennett, 1981a,b Boon and Heijnen, 2001 Fowler, 2001 Sand et al., 2001 Tributsch, 2001). In the direct mechanism, it is assumed that the action taken by the attached cell or bacterium on a metal sulfide will solubilize the mineral surface through direct enzymatic oxidation reactions. The sulfur moiety on the mineral surface is oxidized to sulfate without the production of any detectable intermediates. The indirect mechanism assumes that the cell or bacteria do not act directly on the sulfide-mineral surface, but catalyze reactions proximal to the mineral surface. The products of these bacterially catalyzed reactions act on the mineral surfaces to promote oxidation of the dissolved Fe(II) and S° that are generated via chemical oxidative processes. Ferrous iron and S°, present at the mineral surface, are biologically oxidized to Fe(III) and sulfate. Physical attachment is not required for the bacterial catalysis to occur. The resulting catalysis promotes chemical oxidation of the sulfide-mineral surface, perpetuating the sulfide oxidation process (Figure 1). 

Table 6 Comparison of sulfide-mineral oxidation rates from abiotic, microbial, and field measurements. 

The hydrology of field situations, whether arising from climatic patterns or of a contrived kind, has been much studied in relation to the pollutional aspects of metal and acid release by sulfide mineral oxidation (Andersen and... 

These sulfur species were present even in the strongly reducing zone. As described above, thiosulfate can form from dissolved sulfide(l, 2) and sulfide mineral oxidation(4). Also, it can form from polysulfide decompositlon( ). 

DK Nordstrom, G Southam. Geomicrobiology of sulfide mineral oxidation. In JF... 

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