VOLATILIZATION OF NITROUS ACID FROM UPLAND SOILS

概要

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In order to identify the chemical form of the toxic nitrogenous gas volatilized from upland soils especially from vinyl house soils, laboratory experiments were carried out with two Andosols collected form vinyl houses in Ibaraki Prefecture. Results were as follows. 1) Nitrite ion was detected in the alkaline absorbents which absorbed nitrogenous gas volatilized from the soils, but nitrate ion was not detected in these absorbents. 2) The same amount of nitrite-N and nitrate-N was found in the alkaline solution which absorbed nitrogen dioxide (N0_2) gas. 3) When sodium nitrite was added to the buffer solutions with various pH (4, 5, and 6), nitrogenous gas volatilization occurred even at pH 6, and nitrite ion was found in the alkaline absorbents whereas nitrate ion was not detected. From the results obtained, it is suggested that nitrous acid is the chemical form of the nitrogenous gas volatilized from upland soils.
社団法人日本土壌肥料学会の論文