Abstract
Field measurements of CCl3F and CCl2F2 in groundwater have shown that concentrations in recharge areas are often higher than those in water at equilibrium with the atmosphere. Sorption and desorption of these fluorocarbons from soil surfaces in response to changes in soil moisture may be responsible for this enrichment. Soil slurry experiments were performed to determine whether concentrations of aqueous fluorocarbons increased when water came into contact with dry soils. The aqueous concentrations of CCl3F increased by a factor of 83–981% after mixing water with soils. Concentrations of CCl2F2 in water increased over a range of 34.6–144% for six slurries and decreased in two slurries.
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