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Environmentally Relevant Chemical Mixtures of Concern in Waters of United States Tributaries to the Great Lakes

Sammy Farag by Sammy Farag
August 14, 2018
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Elliott, SM; Brigham, ME; Kiesling, RL; Schoenfuss, HL; Jorgenson, ZG

INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT, 14 (4):509-518; 10.1002/ieam.4041 JUL 2018

Abstract: The North American Great Lakes are a vital natural resource that provide fish and wildlife habitat, as well as drinking water and waste assimilation services for millions of people. Tributaries to the Great Lakes receive chemical inputs from various point and nonpoint sources, and thus are expected to have complex mixtures of chemicals. However, our understanding of the co-occurrence of specific chemicals in complex mixtures is limited. To better understand the occurrence of specific chemical mixtures in the US Great Lakes Basin, surface water from 24 US tributaries to the Laurentian Great Lakes was collected and analyzed for diverse suites of organic chemicals, primarily focused on chemicals of concern (e.g., pharmaceuticals, personal care products, fragrances). A total of 181 samples and 21 chemical classes were assessed for mixture compositions. Basin wide, 1664 mixtures occurred in at least 25% of sites. The most complex mixtures identified comprised 9 chemical classes and occurred in 58% of sampled tributaries. Pharmaceuticals typically occurred in complex mixtures, reflecting pharmaceutical-use patterns and wastewater facility outfall influences. Fewer mixtures were identified at lake or lake-influenced sites than at riverine sites. As mixture complexity increased, the probability of a specific mixture occurring more often than by chance greatly increased, highlighting the importance of understanding source contributions to the environment. This empirically based analysis of mixture composition and occurrence may be used to focus future sampling efforts or mixture toxicity assessments. (C) 2018 SETAC

https://setac.onlinelibrary.wiley.com/doi/abs/10.1002/ieam.4041

The post Environmentally Relevant Chemical Mixtures of Concern in Waters of United States Tributaries to the Great Lakes appeared first on Facts About Water.

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