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PT05 Atmospheric Transport and Fate
(PT072) Importance of atmospheric interactions to PCB cycling in the Hudson and Delaware River Estuaries.
Totten, Lisa1, Rowe, Amy1, Yan, Shu1, 1 Rutgers University, New Brunswick, NJ, USA
ABSTRACT- Recent efforts to establish TMDLs (Total Maximum Daily Loads) for polychlorinated biphenyls (PCBs) in the tidal Delaware and Hudson Rivers have vastly expanded our understanding of the loadings and losses in these systems. While the importance of the atmosphere as a sink for PCBs (via air-water exchange and volatilization) is relatively well understood, the atmosphere as a source of PCBs is becoming an important issue in achieving the 1,000- to 10,000-fold reductions in PCBs loads required by the TMDLs. Neither of these systems can meet current PCB water quality standards due to atmospheric inputs alone. Recent evidence also suggests that gas-phase PCBs are more bioavailable to phytoplankton than PCBs in the water column which are sorbed to suspended matter. Thus efforts in the Delaware River Basin have begun to focus on tracking down sources of atmospheric PCBs. The role of indirect atmospheric deposition in supporting stormwater PCB concentrations is also a concern.
Key words: volatilization, stormwater, toxic chemicals, TMDL
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