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Decomposition of Acrylamide in Soils¹

ABSTRACT

Acrylamide is a potential ground-water contaminant and is a known neurotoxin to man. Thus, information about its fate in soil is desired. The fate of N in acrylamide added to five soils was studied by performing analyses for NH₃, NH₄⁺, NO₂^–, and NO₃^– after incubation of acrylamide-treated soils for various times. The results showed that acrylamide-N is readily hydrolyzed in field-moist and air-dried soils under aerobic and waterlogged conditions and that acrylamide-N is converted to NO₂^– and NO₃^– under aerobic conditions. The percentage of acrylamide-N recovered as inorganic N increased with increasing temperature (10–30°C) and incubation time (2–21 d). After 3 d of incubation at 30°C under aerobic conditions, the percentage of acrylamide-N recovered as inorganic N ranged from 11% in Clarion soil to 76% in Canisteo soil. The corresponding recovery values after 14 d of incubation were 74% and 94%, respectively. Generally, the results with field-moist soils were similar to those obtained with air-dried soils. The recovery of acrylamide-N after 21 d of incubation under waterlogged conditions at 20°C ranged from 76% in Harps soil to 93% in one sandy (Chelsea) soil. Expressed as percentage of acrylamide-N added, the NH⁺-N produced in Clarion, Fayette, Harps, and Canisteo soils after 7 d of incubation under waterlogged conditions ranged from 18% in Clarion soil to 38% in Canisteo soil. The corresponding vlaues after 21 d of incubation were 81% and 90%, respectively. Significant amounts of NH₃ were volatilized from sandy and calcareous soils treated with acrylamide.

Key Words: nitrogen transformation • nitrification • ammonia volatilization • water pollution

¹ Journal Paper no. J-10547 of the Iowa Agric. and Home Econ. Exp. Stn., Ames. Project no. 2112.

² Graduate Student and Professor of Soil Biochemistry, respectively, Dep. of Agronomy, Iowa State University, Ames, Iowa 50011. Present address of the senior author is: Dep. of Biochemistry and Soil Science, University of Khartoum, Shambat, Sudan.

Received for publication February 12, 1982.

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