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Degradation and Leaching of Acrylamide in Soil¹

ABSTRACT

Since some uses of acrylamide could cause ground water contamination, potential hazards were assessed by evaluating the degradation and leaching of ¹⁴C-acrylamide (labelled at the carboxyl position) in four soils: silt loam, clay loam, loamy fine sand, and loam. The soil degradation study utilized the biometer flask method. Acrylamide half-life (t_1/2) was estimated by the time required for release of one-half the evolved ¹⁴CO₂. Half-life was influenced by incubation temperature, acrylamide concentration, and the season at which the soil was collected. At ambient temperature (22°C), half-lives ranged from 18 to 45 hours for 25 ppm acrylamide (on a soil basis). Decreasing temperature or increasing acrylamide concentration increased half-life. Half-life was two and one-half times greater in soil gathered in spring than the same soil gathered in summer. When acrylamide was incubated in anaerobically maintained soil, it apparently metabolized more slowly. Leaching was evaluated by soil TLC. R_f values, which ranged from 0.64 to 0.88, place acrylamide into the "mobile class."

Key Words: metabolism • chemical movement in soil • potential ground water contamination

¹ Contribution from Syracuse Res. Corp. was supported by Office of Toxic Substances, USEPA, Contract no. 68-01-2679.

² Research Associate, Research Assistant, and Division Director, respectively, Life and Material Sci. Div., Syracuse Res. Corp., Syracuse, NY 13210.

Received for publication March 2, 1978.

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