||Analysis of Polychlorinated Biphenyl (PCB) Loading Trends in Lake Michigan.
Rodgers, P. W. ;
Swain, W. R. ;
||Limno-Tech, Inc., Ann Arbor, MI. ;Amsterdam Univ. (Netherlands) .;Environmental Research Lab.-Duluth, MN.
Water pollution ;
Lake Michigan ;
Chlorine organic compounds ;
Chemical analysis ;
Periodic variations ;
Polychlorinated biphenyls ;
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PCB concentrations in coregonid fishes (bloater chubs) collected from Lake Michigan between 1972 and 1980 are used to infer a historical loading trend for polychlorinated biphenyls (PCBs). A mass balance model was developed to describe the dynamics of PCBs by assuming that historical fish concentrations are proportional to concurrent water column concentrations of PCB. The validity of this assumption is strengthened, since the data represent a single species of fish (a pelagic feeder), a specific age class of the species, and a single laboratory performing the collections and analysis of the data. The results of model analysis indicate that PCB loading to Lake Michigan during the period of observation can be described by a linearly decreasing trend. The calibrated model also forecasts the response of selected fish species to various loading scenarios. (Copyright (c) Internat. Assoc. Great Lakes Res., 1983.)