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Gaseous Products Produced by Anaerobic Reaction of Sodium Nitrite with Oxime Compounds and Oximes Synthesized from Organic Matter¹

ABSTRACT

Hydroxylamine was reacted with a number of soil organic matter sources to produce organic matter oximes. This reaction has been used to measure the carbonyl groups in organic matter. The soil organic matter, organic matter oximes, oxime compounds, and aromatic compounds were reacted with buffered (pH 5.0 and pH 6.0) NaNO₂ solutions in evacuated Rittenberg tubes. The gaseous products resulting from these nitrate reactions were analyzed by gas chromatography and compared to determine the nature of soil organic matter oximes and to determine if such oximes could be a source of N₂O production in soils. All oxime compounds studied, except dimethylglyoxime and the quinone oximes, which produced NO, formed N₂O as their major gaseous products. The major gaseous product from organic matter oximes, organic matter, and aromatic compounds was NO. The results suggest that if the reaction product of NH₂OH and organic matter is an oxime, the oxime resembles or reacts like quinone oximes or dimethyl-glyoximes. The negligible amounts of N₂O produced from the reaction of NaNO₂ with organic matter oximes suggests that this is probably not a pathway for N₂O loss from soils.

¹ Contribution from the Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, in cooperation with Colorado Agr. Exp. Sta., Scientific Jour. Series no. 1394.

² Research Soil Scientist, USDA, Fort Collins, Colo.

Received for publication March 19, 1969. Accepted for publication May 1, 1969.