The remaining congeners,
PCBs 20, 28, 52, 126 and 169 were absent in all samples analyzed.
PCB profile was dominated by hexachlorobiphenyls accounting for
69.5% of the total PCBs, followed by pentachlorobiphenyls constituting
15.0%, and heptachlorobiphenyl PCB 180 making up 14.1%
of the total measured levels, while tetrachlorobiphenyls and decachlorobiphenyl
PCB 209 made up a small percentage of the total
PCB residue accounted only for 1.8% and 0.5%, respectively.