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首页> 外文期刊>Journal of great lakes research >Legacy polychlorinated organic pollutants in the sediment of the Great Lakes
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Legacy polychlorinated organic pollutants in the sediment of the Great Lakes

机译：大湖沉积物中的传统多氯有机污染物

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Legacy, organic pollutants, including polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), naphthalenes (PCNs), and diphenyl ethers (PCDEs) were quantified in sediments of the Laurentian Great Lakes of North American. A total of 40 cores (939 core segments) and 198 Ponar surface grab samples were collected from the five Great Lakes between 2010 and 2014. Median concentrations in Ponar grab samples were 8.4, 0.27, 0.05, 0.19 and 0.01 ng/g dry weight (dw) for total-PCBs, Sigma(7)PCDDs, 10PcDFs, Sigma(2)PcNs, and Sigma 7PCDEs, respectively. By using Geographic Information Systems Analysis with the inverse distance weight (IDW) interpretation of the spatial distribution of the chemical inventory at coring sites, total mass loads in the five lakes combined were estimated to be 511, 15.3, 5.3, 20.7 and 2.9 t for total-PCBs, Sigma(7)PCDDs, Sigma(7)PCDFs, Sigma(12)PCNs, and Sigma 7PCDEs, respectively. Patterns of spatial distributions revealed pollution hotspots and provided evidence for historical local sources. Concentrations of residues in Ponar grabs and inventories at coring sites, when normalized to concentrations of organic carbon, exhibited statistically significantly correlations with latitude and longitude of the sampling sites for all five chemical groups. At most coring sites, concentrations have been decreasing towards the sediment surface. At locations relatively close to known or suspected sources, estimated half-times for all classes of chemicals were approximately 20 years. The declining trends of PCDDs and PCDFs were unclear at some locations, suggesting the presence of currently active emission sources. (C) 2018 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：传统的有机污染物，包括北美劳伦式大湖沉积物中的多氯联苯（PCBs），二苯并-对-二恶英（PCDDs），二苯并呋喃（PCDFs），萘（PCNs）和二苯醚（PCDEs）被定量。在2010年至2014年之间，从五个大湖地区总共采集了40个岩心（939个岩心段）和​​198个Ponar表面抓取样品。Ponar抓取样品的中位数浓度为干重8.4、0.27、0.05、0.19和0.01 ng / g（ dw）分别用于总PCB，Sigma（7）PCDD，10PcDF，Sigma（2）PcN和Sigma 7PCDE。通过使用地理距离信息系统分析并用反距离权重（IDW）解释取心地点的化学库存的空间分布，估计五个湖泊的总质量负荷分别为511、15.3、5.3、20.7和2.9 t总PCB，Sigma（7）PCDD，Sigma（7）PCDF，Sigma（12）PCN和Sigma 7PCDE。空间分布格局揭示了污染热点，并为当地历史资源提供了证据。当归一化为有机碳浓度时，取心地点的Ponar抓斗和清单中的残留物浓度与所有五个化学组的采样地点的经度和纬度在统计上均具有显着相关性。在大多数取芯位置，浓度一直朝着沉积物表面降低。在相对接近已知或可疑来源的地点，估计所有类别化学品的半衰期约为20年。在某些地方，PCDDs和PCDFs的下降趋势尚不清楚，这表明存在活跃的排放源。 （C）2018国际大湖研究协会。由Elsevier B.V.发布。保留所有权利。

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