Abstract
Purpose
Many large inland rivers are contaminated by historic industrial and agricultural activities along their shorelines. Redistribution of contaminated river sediments via dredging or flooding can reintroduce previously stored toxic persistent organic pollutants into the aquatic environment.
Materials and methods
We used multiple lines of evidence, including chemical measurements using gas chromatography-high-resolution mass spectrometry and cell-based bioassays using the fish liver cell line RTL-W1, to determine the risk to aquatic biota associated with sediment in three reservoirs and one delta lake in the Saskatchewan River, a large Canadian prairie river.
Results
Concentrations of dioxins and furans (maximum ~ 30 ng kg−1 dry weight) and polycyclic aromatic hydrocarbons (maximum < 300 μg kg−1 dry weight) were generally low in sediments, though hotspots were identified in parts of reservoirs rich in clay and organic matter wherein these chemicals accumulated. Concentration measurements agreed well with bioassay results, as the samples with the highest chemical concentrations induced the greatest EROD activity (biological equivalent concentration = 4010 ng kg−1). With one exception, all fishes tested were below the tolerable intake level for dioxins, and PAH metabolites were only rarely detected in bile, suggesting limited risk to human consumers.
Discussion
Based on our findings, the overall effects of dioxins and dioxin-like chemicals on biota in this system are likely limited. Nonetheless, disturbance and intentional movement of sediments in this river basin for potential sediment restoration in the future should be done cautiously, paying attention to sediment characteristics and local hotspots.
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Acknowledgements
The authors are grateful to Mr. Gary Carriere and the Cumberland House Fishermen’s Co-op for their generous help during fieldwork. Dr. Markus Brinkmann is currently a faculty member of the Global Water Futures (GWF) program, which received funds from the Canada First Research Excellence Funds (CFREF). This research was funded through the GWF project “We need more than just water: Assessing sediment limitation in a large freshwater delta.” This research was supported by a grant from the Canada Foundation for Innovation (CFI) towards analytical infrastructure, as well as NSERC Discovery grants to Drs. Brinkmann and Jardine. We acknowledge the support of Mr. Saurabh Prajapati in creating the map of sampling sites included in this article.
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Brinkmann, M., Petersen, S., Pelletier, A. et al. Multiple lines of evidence to assess risk from dioxins and dioxin-like chemicals in sediment and fish from waterbodies along a large prairie river. J Soils Sediments 24, 414–424 (2024). https://doi.org/10.1007/s11368-023-03620-w
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DOI: https://doi.org/10.1007/s11368-023-03620-w