Describe iron cycling that would likely occur where anaerobic groundwater seeps from the ground and encounters dissolved oxygen. Please include information about the various challenges iron oxiders and reducers would encounter and how the various strategies that they have developed to overcome these challenges. Solution Redox cycling of iron is key process which governs the energy flow and mobility of different aqueous and solid constituent in the soil. both the production and oxidation of iron are catalysed microbially in natural environment. Fe redox cycling plays an important role in global biogeochemistry of the earth. Although there is abiotic oxidation of iron various studies have demonstrated that microbial oxidation is very effective and they will complete the oxidation process which is left by the abiotic process at neutral pH microbial oxidation produces FeIIIi oxides which can be readily used as electron acceptors for dissimilatory FeIII reducing bacteria. Fe reducing bacteria are a diverse group which coupler oxidation of organic carbon to the reduction of soluble and solid phase FeIII forms this type of microbial oxide reduction results in FeII oxides. Examples of dissimilatory iron producing microbes are geobacter species, Geothrix... These microorganisms couple iron reduction to oxidation of a large variety of organic compounds especially geobacter species is tested because they have good ability to convert pollutants aromatic Hydrocarbons and chlorinated solvents. Under anoxice conditions nitrite is chemical oxidant of ferrous ion. Ferrous iron serveh as an electron donors for phototrophic Purple non sulphur bacteria and green sulphur bacteria under anoxic conditions. It was suggested that nitrate reducing and iron oxidizing bacteria or more important than phototrophs as they are not limited by the availability of light. The microbial anoxic iron cycling by Geobacter species which is capable of both dissimilatory iron reduction and nitrate dependent iron oxidation observed by Weber and iron respiration with formate as electron donors as well as iron oxidation with nitrate as electron acceptor demonstrated for the aerobic ammonium oxidizing bacteria..

1. Describe iron cycling that would likely occur where anaerobic groundwater seeps from the
ground and encounters dissolved oxygen. Please include information about the various
challenges iron oxiders and reducers would encounter and how the various strategies that they
have developed to overcome these challenges.
Solution
Redox cycling of iron is key process which governs the energy flow and mobility of different
aqueous and solid constituent in the soil. both the production and oxidation of iron are catalysed
microbially in natural environment.
Fe redox cycling plays an important role in global biogeochemistry of the earth.
Although there is abiotic oxidation of iron various studies have demonstrated that microbial
oxidation is very effective and they will complete the oxidation process which is left by the
abiotic process at neutral pH microbial oxidation produces FeIIIi oxides which can be readily
used as electron acceptors for dissimilatory FeIII reducing bacteria.
Fe reducing bacteria are a diverse group which coupler oxidation of organic carbon to the
reduction of soluble and solid phase FeIII forms this type of microbial oxide reduction results in
FeII oxides.
Examples of dissimilatory iron producing microbes are geobacter species, Geothrix...
These microorganisms couple iron reduction to oxidation of a large variety of organic
compounds especially geobacter species is tested because they have good ability to convert
pollutants aromatic Hydrocarbons and chlorinated solvents.
Under anoxice conditions nitrite is chemical oxidant of ferrous ion.
Ferrous iron serveh as an electron donors for phototrophic Purple non sulphur bacteria and green
sulphur bacteria under anoxic conditions. It was suggested that nitrate reducing and iron
oxidizing bacteria or more important than phototrophs as they are not limited by the availability
of light.
The microbial anoxic iron cycling by Geobacter species which is capable of both dissimilatory
iron reduction and nitrate dependent iron oxidation observed by Weber and iron respiration with
formate as electron donors as well as iron oxidation with nitrate as electron acceptor
demonstrated for the aerobic ammonium oxidizing bacteria.