Biological oxidation of nitric oxide in a humisol
1997
Dunfield, P.F. | Knowles, R.
Consumption of nitric oxide (NO) in a humisol was studied at 0.1-2 ppmv NO, a range representative a NO concentrations in ammonium-fertilized soil. Denitrification was not a major sink for NO. The principal NO- consuming reaction was a biological oxidation, leading ultimately to nitrate (NO3-). Nitrogen dioxide (NO2) and nitrite (NO2-) may have been intermediates in this pathway. An abiological reaction accounted for about 25% of the NO-consuming activity in soil at 90% H2O (d.w.) and 25 degrees C, but contributed relatively more to total NO consumption at higher temperatures. Biological NO-consuming activity was highest at 25 degrees C, while the abiological activity increased exponentially with temperature. The product of the abiological reaction was neither NO3-, NO2-, nor nitrous oxide (N2O), and the reaction did not require O2.
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