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Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds
https://orcid.org/0000-0002-7462-4217
Urban stormwater is a conduit for pollutants such as nutrients and tire-wear compounds through streams to the Great Lakes receiving waters. The transformation product of tire antiozonant 6PPD, 6PPD-quinone (6PPD-Q), is implicated in causing fish mortality. Urban streams entering Lake Ontario and waters adjacent to urban centers in Toronto and Hamilton, Ontario, were assessed for 6PPD-Q and its potential to impact aquatic life. Sampling occurred during fall and spring dry- and wet-weather flows in 2021–2022, overlapping with fish spawning times. Concentrations of 6PPD-Q were elevated during wet-weather (maximum 82 ng/L) in streams with the greatest degree of urbanization and road density but were much lower (2.4–4.5 ng/L) in nearshore waters, suggesting rapid dilution. Precipitation, road density within watersheds, chloride (from road salts), and total phosphorus were correlated with 6PPD-Q concentrations, suggesting that such parameters may provide a means to identify and prioritize key stream habitats for further assessment. A screening level hazard assessment using application factors of 10–1000 and available toxicity end points for fish (rainbow trout, brook trout, coho salmon) showed that 6PPD-Q concentrations may pose a risk in urban streams and nearshore waters of the region. We recommend that stormwater quality control measures be assessed for their effectiveness in reducing 6PPD-Q concentrations.
Preliminary risk assessment shows potential for impacts to salmonids by tire compound 6PPD-Q in urban-impacted waters of western Lake Ontario.
Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds
https://orcid.org/0000-0002-7462-4217
Urban stormwater is a conduit for pollutants such as nutrients and tire-wear compounds through streams to the Great Lakes receiving waters. The transformation product of tire antiozonant 6PPD, 6PPD-quinone (6PPD-Q), is implicated in causing fish mortality. Urban streams entering Lake Ontario and waters adjacent to urban centers in Toronto and Hamilton, Ontario, were assessed for 6PPD-Q and its potential to impact aquatic life. Sampling occurred during fall and spring dry- and wet-weather flows in 2021–2022, overlapping with fish spawning times. Concentrations of 6PPD-Q were elevated during wet-weather (maximum 82 ng/L) in streams with the greatest degree of urbanization and road density but were much lower (2.4–4.5 ng/L) in nearshore waters, suggesting rapid dilution. Precipitation, road density within watersheds, chloride (from road salts), and total phosphorus were correlated with 6PPD-Q concentrations, suggesting that such parameters may provide a means to identify and prioritize key stream habitats for further assessment. A screening level hazard assessment using application factors of 10–1000 and available toxicity end points for fish (rainbow trout, brook trout, coho salmon) showed that 6PPD-Q concentrations may pose a risk in urban streams and nearshore waters of the region. We recommend that stormwater quality control measures be assessed for their effectiveness in reducing 6PPD-Q concentrations.
Preliminary risk assessment shows potential for impacts to salmonids by tire compound 6PPD-Q in urban-impacted waters of western Lake Ontario.
Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds
https://orcid.org/0000-0002-7462-4217
Urban stormwater is a conduit for pollutants such as nutrients and tire-wear compounds through streams to the Great Lakes receiving waters. The transformation product of tire antiozonant 6PPD, 6PPD-quinone (6PPD-Q), is implicated in causing fish mortality. Urban streams entering Lake Ontario and waters adjacent to urban centers in Toronto and Hamilton, Ontario, were assessed for 6PPD-Q and its potential to impact aquatic life. Sampling occurred during fall and spring dry- and wet-weather flows in 2021–2022, overlapping with fish spawning times. Concentrations of 6PPD-Q were elevated during wet-weather (maximum 82 ng/L) in streams with the greatest degree of urbanization and road density but were much lower (2.4–4.5 ng/L) in nearshore waters, suggesting rapid dilution. Precipitation, road density within watersheds, chloride (from road salts), and total phosphorus were correlated with 6PPD-Q concentrations, suggesting that such parameters may provide a means to identify and prioritize key stream habitats for further assessment. A screening level hazard assessment using application factors of 10–1000 and available toxicity end points for fish (rainbow trout, brook trout, coho salmon) showed that 6PPD-Q concentrations may pose a risk in urban streams and nearshore waters of the region. We recommend that stormwater quality control measures be assessed for their effectiveness in reducing 6PPD-Q concentrations.
Preliminary risk assessment shows potential for impacts to salmonids by tire compound 6PPD-Q in urban-impacted waters of western Lake Ontario.
Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds
Helm, Paul A. (author) / Raby, Melanie (author) / Kleywegt, Sonya (author) / Sorichetti, Ryan J. (author) / Arabian, Grace (author) / Smith, Derek (author) / Howell, E. Todd (author) / Thibeau, John (author)
ACS ES&T Water ; 4 ; 1422-1432
2024-04-12
Article (Journal)
Electronic Resource
Unknown
Lake Ontario , tire wear , 6PPD-Q , streams , stormwater
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