Historical trends in persistent organic pollutants and metals recorded in sediment from Lake Ellasjøen, Bjørnøya, Norwegian Arctic

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• 作者：A. Evenset ; G.N. Christensen ; J. Carroll ; A. Zaborska ; U. Berger ; D. Herzke ; D. Gregor
• 关键词：Lake Ellasj&#xf8 ; en ; Sediment ; Dating ; Persistent organic pollutants ; Metals
• 刊名：Environmental Pollution
• 出版年：2007
• 期刊代码：28_02697491
• 类别：env
• 出版时间：March 2007
• 卷：146
• 期：1
• 页码：196-205
• 文件大小：479 K

摘要

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 ²¹⁰Pb 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 α- and γ-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.