Occurrence of Atrazine and Related Compounds in Sediments of Upper Great Lakes

Surface grab and core sediment samples were collected from Lakes Michigan, Superior, and Huron from 2010 to 2012, and concentrations of herbicides atrazine, simazine, and alachlor, as well as desethylatrazine (DEA), were determined. Concentrations of atrazine in surface grabs ranged from 0.01 to 1.7...

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Bibliographic Details
Published in:	Environmental science & technology Vol. 50; no. 14; pp. 7335 - 7343
Main Authors:	Guo, Jiehong, Li, Zhuona, Ranasinghe, Prabha, Bonina, Solidea, Hosseini, Soheil, Corcoran, Margaret B, Smalley, Colin, Kaliappan, Rajashankar, Wu, Yan, Chen, Da, Sandy, Andy L, Wang, Yawei, Rockne, Karl J, Sturchio, Neil C, Giesy, John P, Li, An
Format:	Journal Article
Language:	English
Published:	United States American Chemical Society 19-07-2016
Subjects:	Atrazine Contaminated sediments Environmental Monitoring Environmental science Geologic Sediments Herbicides Lakes Michigan Sediments Water Pollutants, Chemical USA, Michigan L., Saginaw Bay North America, Huron L USA, Illinois, Michigan L North America, Great Lakes
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Summary:	Surface grab and core sediment samples were collected from Lakes Michigan, Superior, and Huron from 2010 to 2012, and concentrations of herbicides atrazine, simazine, and alachlor, as well as desethylatrazine (DEA), were determined. Concentrations of atrazine in surface grabs ranged from 0.01 to 1.7 ng/g dry weight and are significantly higher in the southern basin of Lake Michigan (latitude <44°) than other parts of the three lakes. The highest concentration of alachlor was found in sediments of Saginaw Bay in Lake Huron. The inventory and net fluxes of these herbicides were found to decline exponentially from the south to the north. The concentration ratio of DEA to atrazine (DEA/ATZ) increased with latitude, suggesting degradation of atrazine to DEA during atmospheric transport. DEA/ATZ also increased with sediment depth in the sediment cores. Diffusion of deposited herbicides from the upper sediment into deeper sediments has occurred, on the basis of the observed patterns of concentrations in dated sediment cores. Concentrations of atrazine in pore water were estimated and were higher than those reported for the bulk waters, suggesting the occurrence of solid-phase deposition of atrazine through the water column and that contaminated sediments act as a source releasing atrazine to the overlying water.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0013-936X 1520-5851
DOI:	10.1021/acs.est.6b00706