Environmentally relevant chemical mixtures of concern in waters of United States tributaries to the Great Lakes

Integrated Environmental Assessment and Management
By: , and 



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. 

Study Area

Publication type Article
Publication Subtype Journal Article
Title Environmentally relevant chemical mixtures of concern in waters of United States tributaries to the Great Lakes
Series title Integrated Environmental Assessment and Management
DOI 10.1002/ieam.4041
Volume 14
Issue 4
Year Published 2018
Language English
Publisher Society of Environmental Toxicology and Chemistry
Contributing office(s) Minnesota Water Science Center
Description 10 p.
First page 509
Last page 518
Other Geospatial Great Lakes
Google Analytic Metrics Metrics page
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