||First Order Mass Balance Model for the Sources, Distribution and Fate of PCBs in the Environment.
Whitmore., Frank C. ;
||Versar, Inc., Springfield, Va.;Environmental Protection Agency, Washington, D.C. Office of Toxic Substances.
||474-5G; EPA-68-01-3259; EPA/460/6-77/006;
Air pollution ;
Water pollution ;
Chlorine organic compounds ;
Lake Michigan ;
Great Lakes ;
Mathematical models ;
Mass transfer ;
Atmospheric models ;
Polychlorinated biphenyls ;
||Some EPA libraries have a fiche copy filed under the call number shown.
A first order model for the sources, distribution and fate of PCBs in an aquatic system is described. The model is then applied to Lake Michigan and to the Great Lakes Systems. The results obtained from the model indicate that atmospheric sources are a major PCB input to the Great Lakes. Because of the great water mass of the lakes, the PCB concentration appears to be storage controlled rather than loss controlled. The major loss mechanisms are found to be co-evaporation from the airwater interface and entrapment with sediments. It is estimated that if all inputs or PCBs rate Lake Michigan were eliminated, it would take more than 70 years for the concentration of PCBs in the water to decrease by 50 per cent.