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Reduction and Oxidation Reactions Oxidation states: Cl3C-CCl3 2e- Cl2CCCl2 2Cl- Ph-NO2 6H 6e- Ph-NH2 2H2O SO42-

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Reduction and Oxidation Reactions Oxidation states: Cl3C-CCl3 2e- Cl2CCCl2 2Cl- Ph-NO2 6H 6e- Ph-NH2 2H2O SO42-

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    2. Redox Reactions Chapter 14

    3. Redox reactions may be abiotic or biological

    4. Common environmental redox reactions

    8. Reduction potentials

    9. Oxidation reactions:

    10. Oxidation of phenols by Mn(III/IV) oxides:

    18. One-electron reduction potentials more halogens = more favorable reduction potential

    29. Microbial dechlorination of PCBs So far, seen only in aquatic sediments Mediated by chloroflexi Use organochlorine compounds as electron acceptors Some spp are also sulfate reducers Usually removes chlorines at meta and para but not ortho positions Several pathways identified

    30. Dechlorination pathways

    31. PCBs 47 and 51 build up as intermediates

    32. Further dechlorination of PCBs 47 & 51 by a different pathway (bacterial consortium?)

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