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Oxidation and reduction
Electron donors= reducing agents: tend to donate electrons
Electron acceptors= oxidizing agents: tend to accept electrons
- Oxidation can mean:
- • Gain of oxygen atoms• Loss of hydrogen atoms• Increase in ionic charge• Decrease in electron densityThis may be summarized as Increase in Oxidation State
- • Gain of hydrogen atoms• Loss of oxygen atoms• Decrease in ionic charge• Increase in electron densityThis may be summarized as Decrease in Oxidation State.
N, Fe, S, C that are good electron acceptors/donors
- red:N20, N2, NH4
Order of preference for electron acceptors in resp., sequence over time and with
depth in soil
Sequence in time- Beginning with oxygen depletion, nitrate reduction, iron reduction, then sulfate reduction.
depth- wetland soils have shallow oxidized layer over reduced layer, and soil profiles with depth show a similar sequence of high to low energy redox reactions.