title: Historical trends in persistent organic pollutants and metals recorded in sediment from Lake Ellasjøen, Bjørnøya, Norwegian Arctic.
abstract: Ellasjøen receives contaminants from both atmospheric and biological transport (seabird guano). Historical trends of selected persistent organic pollutants and metals were determined by interpretation of down-core contaminant profiles in conjunction with sediment layer ages, determined by the (210)Pb method. Polychlorinated biphenyls (PCBs) and dichloro-diphenyl-trichloroethane and metabolites (DDTs) increased from about 1930 until 1970 (max. sum PCBs 71.8 ng/g dry weight (dw), max sum DDTs 4.0 ng/g dw), declining afterwards to 46.4 ng/g dw and 1.6 ng/g dw, respectively. Polybrominated diphenylethers (PBDEs) concentrations are increasing in Ellasjøen, reaching 0.73 ng/g dw in 2001. Hexabromocyclododekane (HBCD) was measured only in sediment from 1-2 cm depth (0.43 and 3.88 ng/g dw of alpha- and gamma-HBCD, respectively). Most metals (As, Cd, Co, Ni and Zn) showed a similar pattern as PCBs. No clear trends were observed for Cr, Pb or V. Mercury (Hg) has increased gradually since the beginning of the industrial era.
authors.affiliation: Akvaplan-niva, Polar Environmental Centre, N-9296 Tromsø, Norway. ae@akvaplan.niva.no <ae@akvaplan.niva.no>
authors.forename: A
authors.initials: A
authors.lastname: Evenset
authors.forename: G N
authors.initials: GN
authors.lastname: Christensen
authors.forename: J
authors.initials: J
authors.lastname: Carroll
authors.forename: A
authors.initials: A
authors.lastname: Zaborska
authors.forename: U
authors.initials: U
authors.lastname: Berger
authors.forename: D
authors.initials: D
authors.lastname: Herzke
authors.forename: D
authors.initials: D
authors.lastname: Gregor
mesh_terms: D001110:Arctic Regions; D003634:DDT / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D008670:Metals / Q000032:analysis*; D009664:Norway; D010573:Pesticide Residues / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis; D013995:Time
chemical_list: D004785:Environmental Pollutants; D006842:Hydrocarbons, Brominated; D006843:Hydrocarbons, Chlorinated; D008670:Metals; D010573:Pesticide Residues; C089796:hexabromocyclododecane; D003634:DDT; D011078:Polychlorinated Biphenyls