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Formation of Dimethylnitrosamine, a Carcinogen and Mutagen, in Soils Treated with Nitrogen Compounds¹

ABSTRACT

Dimethylamine was formed from trimethylamine in a spodosol (pH 3.8), a silty clay loam (pH 5.8), and a silt loam (pH 6.5). Dimethylnitrosamine appeared if the soils were amended with the tertiary amine and nitrate or nitrite or with dimethylamine and nitrite. The amines were added to soil to a concentration of 50 and 500 ppm as nitrogen. The nitrosamine also was produced from the tri- or dimethylamine in the spodosol in the absence of supplemental inorganic nitrogen. The fungicide, thiram, was converted to dimethylnitrosamine in the spodosol treated with nitrate or nitrite. The identity of the nitrosamine was verified by ultraviolet spectrometry and thin-layer and gas chromatography. Dimethylamine and dimethylnitrosamine disappeared with time from the soils.

¹ Contribution from the Dep. of Agron., New York State College of Agr. and Life Sciences, Cornell University, Ithaca. 14850. Agronomy Paper no. 1007.

² Research Assistants and Professor of Soil Science, respectively, Cornell University, Ithaca, N.Y. 14850. The present address of the senior author is International Institute of Tropical Agriculture, P.M.B. 5320, Ibadan, Nigeria. The second author is now at Dep. of Microbiology, Univ. of Ghent, Belgium.

Received for publication January 2, 1973. Accepted for publication March 20, 1973.

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