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Published in Soil Sci Soc Am J 50:72-75 (1986)
© 1986 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Decomposition of Methyl Nitrite in Solutions and Soils1

A. M. T. Magalhães and P. M. Chalk2

ABSTRACT

The role of hydrolysis as a process affecting the concentration of CH3ONO in the soil atmosphere was investigated by measuring the sorption of CH3ONO and the formation of NO-2 and NO-3 in two soils (–33-kPa soil water potential) and three solutions in the dark at 20°C for 10 h. Soil pH and the pH of distilled H2O decreased on absorption of CH3ONO. In acidic solutions (distilled H2O and 0.1 M H2SO4), > 90% of CH3ONO was recovered as NO-3, whereas to an alkaline soil and 0.2 M NaOH, > 80% was recovered as NO-2. Only 0 to 7% of CH3ONO remained in the atmosphere. In an acid soil only 50% of CH3ONO was recovered as [CH3ONO + NO-2 + NO-3]-N. Recoveries of N in {gamma}-irradiated and nonirradiated soils did not differ significantly. The data indicate that CH3ONO was rapidly hydrolysed in solutions and in soils [CH3ONO + H2O {rightleftharpoons} CH3OH + HNO2], and that NO-3 formed via the self-decomposition of HNO2. The low recovery of N in the acid soil may have been due to the participation of HNO2 in chemodenitrification reactions. The rapid hydrolysis of CH3ONO is likely to inhibit the emission of CH3ONO formed in soils, and to cause the sorption of CH3ONO evolved from soils in closed systems.

NOTES

1 Contribution from the School of Agriculture and Forestry, Univ. of Melbourne, Parkville 3052, Australia.

2 Graduate Student and Senior Lecturer in Soil Science, respectively.

Received for publication February 11, 1985. Accepted for publication August 19, 1985.






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Copyright © 1986 by the Soil Science Society of America.