BIOL-2356EL Lecture Notes - Lecture 15: Hydrogen Sulfide, Sulfur Dioxide, Lithotroph
4 Mar 2020
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Chapter 15 - biogeochemistry #3: sulfur, heavy metals & pop. Associated with conditions adverse (harmful) to life. Actually, s is essential for all living organisms. Sulfur as a source of energy for primary production: Chemoautotroph bacteria fix carbon by oxidizing hydrogen sulfide (h 2 s) Chemoautotrophic sulfur bacteria oxidize h 2 s to produce energy they use this energy to reduce. Deep marine communities oxidize s for primary production. Occurs in hot springs, acidic tailings, acid mine drainages. Oxidation of iron and sulfur produces acid. S or sulfide is oxidized to sulfate (so 4 . Sulfate-reducing bacteria reduces sulfate to sulfide in order to get energy from organic matter! Sulfur compounds used as electron acceptors : needed for oxidation in biochemical processes. Oxidized iron: soil is red like rust. Anthropogenic sources (human activity): 96 (like the superstack) In sudbury, sulfur dioxide emissions were over 1. 25 tg in 1960.
