Inorganic Nitrogen Transformations Through the Oxidation and Reduction of Iron

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Abstract
In acid solution nitrate can be reduced by ferrous iron to N2 through such intermediates as nitrogen tetraoxide, nitrous acid, hyponitrous acid and nitrous oxide or through nitrogen tetraoxide, nitrous acid, nitric oxide, and nitrous oxide. These sequences show similarities to those occurring in the denitrification process. In a basic solution the reduction of nitrite to N2 may go through nitric oxide, N2O22‐, and nitrous oxide, or it may be reduced to ammonia through hydroxylamine, and hydrazine. Hydrazine and hydroxylamine are very unstable in the presence of iron in solution. In acid solution both hydrazine and hydroxylamine are oxidized by ferric iron to N2 and N2O. The amount of N2O formed is proportional to the ferric iron concentration.
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  • National Science Foundation

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