Evaluation of temporal and age-related trends of chemically and biologically generated 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin equivalents in lake ontario lake trout, 1977 to 1993

摘要

Levels of selected non-, mono-, and di-ortho-substituted polychlorinated biphenyl (PCB) congeners, polychlorinated dibenzo-p-dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) were determined in 4-year-old lake trout from the eastern basin of Lake Ontario, collected from 1977 to 1993. Results confirm that overall levels of contaminants have decreased steadily in lake trout since 1997, and that coplanar PCB levels do not appear to be increasing over time in relation to levels of other PCBs.