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Effect of Bulk Density on the Diffusion and Volatilization of Dieldrin from Soil¹

ABSTRACT

The rate of volatilization of dieldrin from a buried soil layer generally increased as the bulk density of an overlying soil layer decreased. The rate of diffusion through soil and, therefore, the rate of volatilization is controlled by the bulk density of the soil. The rate of volatilization of dieldrin from a buried soil layer increased with time, reaching a maximum level when diffusion through the overlying soil layer neared a steady state. The volatility rate was proportional to the initial dieldrin concentration in the buried soil layer. The volatilization of dieldrin from treated soil is concluded to be controlled by a diffusion process once the surface soil pesticide concentration is reduced.

Key Words: pesticide residues • vapor phase diffusion

¹ Contribution from the Department of Soil Science and Agricultural Engineering and the Agricultural Research Service, USDA, University of California, Riverside. This work has been supported by USDA Cooperative Agreement No. 12-14-100-9016(41).

² Assistant Professor of Soil Science and former Graduate Student, University of California, Riverside, and Soil Scientist, USDA, Riverside, Calif. 92502.

Received for publication October 26, 1971.