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Desorption of Lindane from Soil as Related to Vapor Density¹

ABSTRACT

Vapor-phase desorption of soil-applied lindane (-BHC) was studied by measuring vapor density of lindane as affected by soil-water content, temperature, and lindane concentration. Water content had no effect on vapor density until the soil was dried to a water content below one molecular layer of water. When more than a monomolecular layer of water was present in Gila silt loam, vapor density increased with temperature and lindane concentration until a saturated vapor density, equal to that of lindane without soil was reached at 50, 55, and 62 ppm lindane at 20, 30, and 40C, respectively. Isotherms relating soil lindane concentration to relative vapor density were similar to isotherms relating soil lindane concentration to solution concentration indicating that Henry's Law, p = kc, can be used to predict pesticide behavior in the soil-water system. Desorption isotherms for lindane on Gila silt loam and bentonite fitted the Freundlich equation. Freundlich constants for vaporphase lindane were similar to those reported previously by others for adsorption of lindane from the solution phase by soil materials.

¹ Contribution from the Southwest Branch, Soil & Water Conservation Research Division, ARS, USDA in cooperation with the University of California, Riverside.

² Soil Scientist and Chemist, USDA, respectively.

Received for publication December 1, 1969. Accepted for publication February 20, 1970.