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Lindane Diffusion in Soil¹

ABSTRACT

Vapor and "nonvapor" diffusion of lindane was measured in Gila silt loam at various soil-water contents. The apparent vapor diffusion coefficient (D_v') increased rapidly as water content increased to 4%. There was a gradual decrease in D_v' as water content increased from 4 to 20% and then a rapid decrease at water contents greater than 20%. The "nonvapor" apparent diffusion coefficient (D_s') also reached a maximum at 4% water content and declined at water contents between about 4 and 20%. D_s' increased as water content was increased above 20%.

Apparently diffusion in the "nonvapor" phase occurs at the water-air and water-solid interface as well as in the water. The contribution of these pathways to the total transfer is dependent upon water content. It was assumed that the water-solid diffusion coefficient would be constant at water contents above 4%. The air-water interface diffusion was highest at 4% water content and decreased at higher water contents. Diffusion in water was essentially zero at water contents below 15% and increased with increasing water contents above this value.

¹ This work has been supported in part by USDA Cooperative Agreement no. 12-14-100-9016(41).

² Former Postgraduate Research Soil Scientist; Professor of Soil Physics. and Assistant Professor of Soil Science, Univ. of California, Riverside, Calif. 92502; and Soil Scientist and Professor of Soils, USDA-ARS and Colorado State Univ., Fort Collins, Colo., respectively. Present address of senior author: The National parks Commission, Belair National Park, Belair, South Australia 5052.

Received for publication March 1, 1972. Accepted for publication July 5, 1972.