||Contamination of Fish by 2,3,7,8-Tetrachlorodibenzo-P-Dioxin: A Survey of Fish from Major Watersheds in the United States.
Kuehl, D. W. ;
Butterworth, B. C. ;
McBride, A. ;
Kroner, S. ;
Bahnick, D. ;
||Environmental Research Lab.-Duluth, MN. ;Wisconsin Univ.-Superior. Center for Lake Superior Environmental Studies.
Water pollution effects(Animals) ;
Mass spectroscopy ;
Soil contamination ;
Quality assurance ;
Quality control ;
United States ;
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A survey of contamination of fish from major watersheds in the United States by 18.104.22.168-TCDD has been conducted by the U.S. EPA. Bottom feeding and predator fish were collected at 90 statistically selected and 305 regionally selected sites and analyzed by GC/MS. It was found that 19% of the statistically sampled sites and 31% of the regionally selected sites were contaminated at or above a minimum level of detection varying from 0.5 to 2.0 pg/g. Ten percent of all samples were contaminated at levels greater than 5.0 pg/g. It was also observed that a subset of samples collected at sites near discharge from pulp/paper manufacture (N=28) had a higher frequency of TCDD contamination above 5.0 pg/g (38%). The subset of samples also contained the sample of the greatest level of TCDD contamination (85 pg/g).