title: Current status of short- and medium chain polychlorinated n-alkanes in top predatory fish across Canada.
abstract: Short and medium chain polychlorinated n-alkanes (sPCAs and mPCAs) were measured in top predatory fish from nine freshwater bodies across Canada in 2010-2011. Maximum sPCA concentrations were measured in brook trout from Kejimikujik Lake in Nova Scotia (10±8 ng g(-1) wet weight) while the lowest concentrations were found in lake trout from Kusawa Lake in the Yukon (2±3 ng g(-1) wet weight). The presence of sPCAs in fish from these sites is strongly suggestive of long range atmospheric transport, given the absence of known point sources. The highest mPCA concentrations (11-12 ng g(-1) wet weight) were found in lake trout from Lakes Huron, Erie and Ontario. These results showed that fish from sites impacted mostly by atmospheric sources contained higher concentrations of sPCAs than mPCAs while the opposite was observed in sites impacted by industrialization. C12H20Cl6, C12H19Cl7, C14H24Cl6 and C14H23Cl7 were the most abundant homologue groups observed. Lake trout from Lake Huron showed a markedly different sPCA homologue profile, characterized by higher abundances of C11H15Cl9 and C12H17Cl9, indicating local sources. Principal components analysis of sPCA homologues abundances showed that C12H20Cl6, C12H19Cl7, C11H18Cl6, C11H17Cl7 were associated with lakes influenced by atmospheric sources while C11H16Cl8, C12H18Cl8, C11H15Cl9, C12H17Cl9 were associated with sites influenced by urban/industrial sources. Finally, concentrations of sPCAs in Lake Ontario lake trout collected in 2011 decreased 6.6-fold compared to 2001, however no significant differences were observed for mPCAs.
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada. Electronic address: libiasaborido@yahoo.ca.
authors: Libia
authors: L
authors: Saborido Basconcillo
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada.
authors: Sean M
authors: SM
authors: Backus
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada.
authors: Daryl J
authors: DJ
authors: McGoldrick
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada.
authors: Donna
authors: D
authors: Zaruk
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada.
authors: Ed
authors: E
authors: Sverko
authors: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada.
authors: Derek C G
authors: DC
authors: Muir
mesh_terms: D000473:Alkanes / Q000032:analysis*; D000818:Animals; D002170:Canada; D020387:Food Chain; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D060106:Lakes; D014337:Trout; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000473:Alkanes; D006843:Hydrocarbons, Chlorinated; D014874:Water Pollutants, Chemical
keywords: Atmospheric transport; Chlorinated paraffins; Fish; Homologue group patterns; Polychlorinated n-alkanes