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PM06 Emerging Pollutants
(PM056) HBCD, PBDEs and DBDPE in fish from Lake Winnipeg, Manitoba (Canada).
Tomy, G1, Halldorson, T1, Danell, R1, Law, K1, Stern, G1, Gewutz, S2, Whittle, M3, Alaee, M4, Marvin, C4, 1 Department of Fisheries and Oceans, Winnipeg, Manitoba, Canada2 Department of Geography, Toronto, Ontario, Canada3 Department of Fisheries and Oceans, Burlington, Ontario, Canada4 Environment Canada, Burlington, Ontario, Canada
ABSTRACT- This study examined the extent of bioaccumulation and trophic transfer of brominated flame retardants (HBCD, PBDEs and DBDPE) in the pelagic food web of the south basin of Lake Winnipeg. Ranked as the tenth largest lake in the world with a surface area of 25 x 103 km2, water enters the lake from as far away as the eastern slopes of the Rocky Mountains, NW Ontario near Lake Superior and the northern tip of South Dakota. The south basin of Lake Winnipeg is populated by many small towns and cottage communities. Mean PBDE (sum of 39 congeners) lipid weight concentrations in fish muscle tissue were higher than HBCD and DBDPE. PBDE concentrations ranged from 11 ng/g in whitefish to 380 ng/g in goldeye. Mean concentrations in walleye (78 ng/g) were approximately two times lower than that in sauger (150 ng/g) and three times lower than in perch (212 ng/g) and burbot (240 ng/g). On a congener basis, BDEs-28/33, -47, -66, -100, -99, -153, -154 and -209 were consistently detected in all the fish species. BDE-209 accounted for the bulk of body burdens of PBDEs in walleye, perch, burbot and whitefish. All three HBCD isomers were detected in all the fish species from Lake Winnipeg with the -isomer consistently lower than the - and -isomers. Mean HBCD concentrations ranged from 3 ng/g in whitefish to 78 ng/g in burbot. Concentrations of HBCD in the other fish species were similar and ranged from 9 ng/g in sauger to 14 ng/g in walleye. DBDPE was detected in all the fish except whitefish at low ng/g levels.
Key words: Polybrominated diphenyl ether, Hexabromocyclododecane, decabromodiphenyl ethane, brominated flame retardants
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