||Polychlorinated Biphenyls in the Surface Waters and Bottom Sediments of the Major Drainage Basins of the United States.
Dennis., D. Steve ;
||Environmental Protection Agency, Washington, D.C. Office of Pesticide Programs.
Chlorine organic compounds ;
Surface waters ;
United States ;
Puerto Rico ;
Polychlorinated biphenyls ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Data gathered from monitoring activities indicate the widespread occurrence of PCB's in surface waters and bottom sediments of the major drainage basins of the United States. A preliminary assessment of PCB levels shows median residue levels of the positive detections for the years 1971 to 1974 ranging between 0.1 to 3.0 micrograms/l for unfiltered water samples and from 1.2 to 160.0 micrograms/kg for bottom sediments. The highest levels were found in basins east of the Mississippi and bottom sediments may contain concentrations of PCB's many times higher than those in the overlying water.