Abstract
AbstractManometric and infrared studies of the gaseous products formed by reacting HNO2 with humic and fulvic acids, lignins. lignin‐building units, and polyphenols showed the presence of N2, N2O, and CO2. In addition, methyl nitrite (CH3ONO) occurred in the gases obtained from lignins and certain phenolic derivatives. The CH3ONO originated through dismutation of phenolic ethers; the CO2 from decarboxylation of aromatic acids and cleavage of ring structures. Aromatic‐like substances interfere with the determination of free amino groups in soil organic matter by the Van Slyke nitrous acid method.
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