PCBs, PBDEs and pesticides released to the Arctic Ocean by the Russian Rivers Ob and Yenisei

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• 作者：JoLynn Carroll ; Vladimir Savinov ; Tatiana Savinova ; Salve Dahle ; Robert McCrea ; Derek C. G. Muir
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：January 1, 2008
• 年：2008
• 卷：42
• 期：1
• 页码：69 - 74
• 全文大小：255K
• 年卷期：v.42,no.1(January 1, 2008)
• ISSN：1520-5851

文摘

The Ob and Yenisei Rivers contribute 37% of riverine freshwater inputs to the Arctic Basin and thus represent an important pathway for the land−Arctic ocean exchange of contaminants. Sampling was carried out in the Yenisei (2003) and Ob (2005) River estuaries and Kara Sea to address the general lack of reliable dissolved contaminant flux data for these major rivers. Contaminant analyses were performed by high resolution mass spectrometry on sample extracts taken from filtered large volume water samples (50–100 L) and concentrated in situ onto XAD-2 resin columns. Hexachlorocyclohexanes (HCHs), the polychlorinated biphenyl (PCB) mixtures Sovol and trichlorodiphenyl, dichlorodiphenyltrichloroethane (DDT), as well as “penta” brominated technical mixtures of polybrominated diphenyl ethers (PBDEs) are important contributors to persistent organohalogen contamination for these waterways. Dissolved fluxes to the Kara Sea were estimated at ΣHCH 246 kg/yr, ΣPCB 63 kg/yr, ΣDDT 16 kg/yr, hexachlorobenzene 8 kg/yr, α-endosulfan 8 kg/yr, dieldrin 5 kg/yr, ΣPBDE 4 kg/yr, and chlordanes 4 kg/yr. Contaminant fluxes from these rivers are similar to those reported for major Canadian rivers, confirming expectations that the Ob and Yenisei are also major point sources for the Arctic basin.