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Adsorption/Desorption hysteresis in organic pollutant and soil/sediment interaction.

Adsorption and desorption of pollutants to soil and sediment materials are major fate mechanisms. The hypothesis that adsorption and desorption are reversible processes has been tested. The organic pollutants naphthalene, phenanthrene, and p-dichlorobenzene have been studied in the laboratory using batch reactors at room temperature from a few hours to over 2 months. The adsorption experiments were at equilibrium within 1-4 days and could be modeled using simple linear isotherms with K p values consistent with published K oc and K ow relationships. Desorption experiments were conducted with the contaminated sediments by successive dilutions