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Nitrosation of Soil Organic Matter: III. Nature of Gases Produced by Reaction of Nitrite with Lignins, Humic Substances, and Phenolic Constituents Under Neutral and Slightly Acidic Conditions¹

ABSTRACT

Molecular nitrogen, nitrous oxide (N₂O), nitric oxide (NO), and CO₂ were identified in the gases formed by reacting NO₂^- with soils, humic and fulvic acids, lignins, lignin-building units, and polyphenols in aqueous buffer solutions of pH 6 and 7 in the absence of oxygen. The composition of the mixture of gases was dependent upon the nature of the material examined, with relatively larger amounts of N₂ being produced from the humic and fulvic acids. Compounds containing methoxyl groups failed to yield detectable amounts of methyl nitrite (CH₃ONO) at the pH levels found in most soils. The reaction of NO with humic substances in the absence of oxygen led to the production of N₂O and CO₂.

¹ Contribution from the Department of Agronomy, University of Illinois, Urbana. Supported by Regional Research Funds (NC-55).

² Professor of Soil Chemistry, University of Illinois; Assistant Soil Scientist, Georgia Exp. Sta., Experiment, Ga.; Principal Research Scientist, CSIRO, Canberra City, A.C.T., Australia; and Undergraduate Student, University of Illinois, respectively.

Received for publication June 9, 1969. Accepted for publication January 9, 1970.

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