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 Bristol2007/2008Metabolic Processes•Heterotrophs: obtain carbon <strong>and</strong> energy from existingorganic carbon.•Autotrophs: reduce CO 2 to obtain organic C. Twokinds of autotrophs:•Photosynthetic organisms: obtain energy fromsunlight.•Chemolithoautotrophs: obtain energy by oxidizinginorganic compounds (Fe 2+ , NH 4+ , H 2 ).Heterotrophic Metabolism•Respiration: oxidation of organic carbon to CO 2 .This requires an electron acceptor such as O 2 :CH 2 O + O 2 = CO 2 + H 2 O•Fermentation: in the absence of an electronacceptor, organic C will play both roles:3CH 2 O + H 2 O = CO 2 + 2CH 3 OHPage ‹#›
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