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Legacy polychlorinated organic pollutants in the sediment of the Great Lakes TEXT SIZE: A A A
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.

Publication name

 JOURNAL OF GREAT LAKES RESEARCH, 44 (4):682-692; 10.1016/j.jglr.2018.02.002 AUG 2018


 Li, An; Guo, Jiehong; Li, Zhuona; Lin, Tian; Zhou, Shanshan; He, Huan; Ranansinghe, Prabha; Sturchio, Neil C.; Rockne, Karl J.; Giesy, John P.

Corresponding author(s) 

 LI An 
 Univ Illinois, Sch Publ Hlth, Chicago, IL 60612 USA
 Zhejiang Univ Technol, Coll Environm, Hangzhou 310032, Zhejiang, Peoples R China
 Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310000, Zhejiang, Peoples R China 

 Author(s) from IGCAS  LIN Tian

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