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首页> 外文期刊>Environmental Science & Technology >PCBs, PBDEs and pesticides released to the Arctic Ocean by the Russian Rivers Ob and Yenisei
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PCBs, PBDEs and pesticides released to the Arctic Ocean by the Russian Rivers Ob and Yenisei

机译：俄罗斯鄂毕河和叶尼塞河向北冰洋释放的多氯联苯，多溴二苯醚和农药

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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 ∑HCH 246 kg/yr, ∑PCB 63 kg/yr, ∑DDT 16 kg/yr, hexachlorobenzene 8 kg/yr, α-endosulfan 8 kg/ yr, dieldrin 5 kg/yr, ∑PBDE 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 0b and Yenisei are also major point sources for the Arctic basin.
机译：鄂毕河和叶尼塞河向北极盆地贡献了37％的河流淡水输入，因此代表了陆地-北极海洋污染物交换的重要途径。在Yenisei（2003）和Ob（2005）河口和卡拉海进行了采样，以解决这些主要河流普遍缺乏可靠的溶解性污染物通量数据的问题。通过高分辨率质谱对从过滤后的大量水样品（50-100 L）中提取的样品提取物进行污染物分析，然后将其原位浓缩到XAD-2树脂柱上。六氯环己烷（HCH），Sovol和三氯二苯基的多氯代联苯（PCB）混合物，二氯二苯基三氯乙烷（DDT）以及多溴代二苯醚（PBDEs）的“五溴”溴化技术混合物是造成这些水道持久受到有机卤素污染的重要因素。估计流向卡拉海的溶解通量为∑HCH 246千克/年，∑PCB 63千克/年，∑DDT 16千克/年，六氯苯8千克/年，α-硫丹8千克/年，狄氏剂5千克/年， ∑PBDE 4千克/年，氯丹4千克/年。这些河流的污染物通量与加拿大主要河流的污染物通量相似，证实了人们对0b和叶尼塞河也是北极盆地主要点源的期望。

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