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Fe 3+

Electrical Potential Generated by the Iron Cycle. Air. O 2. O 2. Water. +. H 2 O. H 2 O. Sediment. Fe 3+. Fe 3+. e -. -. Fe 2+. Start. 2H +. 2H +. e -. e -. Organic Matter. CO 2. Continue.

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Fe 3+

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  1. Electrical Potential Generated by the Iron Cycle Air O2 O2 Water + H2O H2O Sediment Fe3+ Fe3+ e- - Fe2+ Start 2H+ 2H+ e- e- Organic Matter CO2 Continue The oxidation of organic matter to CO2 by bacteria in the anaerobic zones of sediment produces an excess of reactive electrons at the bottom of the column. Some of these electrons are transferred directly to the bottom electrode (anode). Others are used by bacteria to reduce Fe3+ to Fe2+. This reduced iron can then be oxidized back to Fe3+ at the anode which takes up the extra electron. The presence of oxygen at the top of the column causes a deficit of electrons. The difference between concentrations of electrons at the top and bottom of the column produces an electrical potential or charge. We can measure the potential by connecting the top and bottom electrodes. The electrons at the anode will flow to the cathode where they will react with oxygen to form water. Potential is measured in volts and the rate of flow (current) is measured in amps.

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