1ESM 219Nov 5th: S, Fe, Hg cycles and microbesMicrobes in the S cycleThe global balance of sulfur. Artificial emissions are derived from human activities. An asterisk indicates a process that is partially or solely due to microbial action.NOTE:Biological and chemicalS cycling are at similar rates.DMSO=dimethyl sulfoxideDMS =dimethyl sulfideSulfur and sulfide oxidation•sulfur oxidation (autrophic or heterotrophic)•Lowers pH•Thiobacillusare everywhere•Beggiatoa– mixotroph: organic cmpd for C, H2S for energy•Oxidation reactions (can involve NO3-)– So+ 3/2 O2+ H2O →H2SO4-587 kJ/rxn– H2S + 2O2→SO42-+ 2H+-798.2 kJ/rxn–HS- + ½ O2+ H+→So+ H2O-209.4 kJ/rxn– S2O32-+H2O+2O2→2SO42-+2H+-822.6 kJ/rxn
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