Biological oxidation of nitric oxide in a humisol |
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| Authors: | P. F. Dunfield Roger Knowles |
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| Affiliation: | (1) Department of Natural Resource Sciences, McGill University, Macdonald Campus, 21111 Lakeshore Rd., Ste. Anne de Bellevue, Quebec, H9X 3V9, Canada Tel.: (514) 398–7751; Fax. (514)–398–7990; e-mail: eh13@musica.mcgill.ca, CA |
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| Abstract: | Consumption of nitric oxide (NO) in a humisol was studied at 0.1–2 ppmv NO, a range representative of 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 25oC, but contributed relatively more to total NO consumption at higher temperatures. Biological NO-consuming activity was highest at 25oC, 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. Received: 12 March 1996 |
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| Keywords: | Humisol Nitrate Nitric oxide Nitrite Nitrogen dioxide Acetylene |
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