Abstract
Two different laboratory experiments were undertaken to investigate whether the aging of polychlorinated biphenyls (PCBs) in soils affects their soil−air partitioning behavior. In the first, portions of a sandy loam soil were spiked and stored in glass jars for 3−392 days to artificially age the PCB residues. Soil−air partition coefficients (KSA) were then determined using a solid-phase fugacity meter. In the second experiment, a sewage sludge that had been highly contaminated with PCBs more than 30 years ago and stored in a lagoon was obtained and blended with soil. An additional 10 PCB congeners, which were shown not to be naturally present in the sludge-amended soil, were added. Aliquots of the spiked sludge-amended soil were stored for 1−42 days. After each storage period, the relative partitioning of the native and spiked congeners from the sludge-amended soil into the air was measured. Results from the two experiments showed that aging, by either storage in glass jars or exposure to natural processe...
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