Journal
SCIENCE
Volume 371, Issue 6525, Pages 185-189Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abd6951
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Funding
- NSF [1608464, 1803240]
- EPA [01J18101, DW-014-92437301]
- Washington State Governors Funds
- Burges Fellowship
- Regional Monitoring Program for Water Quality in San Francisco Bay
- FAPESP [2018/16040-5, 2019/14770-9]
- NSERC [ALLRP 549399, RGPIN-2019-04165]
- Canada Foundation for Innovation (CFI)
- Ontario Ministry of Research and Innovation
- Krembil Foundation
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1608464] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1803240] Funding Source: National Science Foundation
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [18/16040-5] Funding Source: FAPESP
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Research on coho salmon in the U.S. Pacific Northwest revealed unexpected risks of a highly toxic quinone transformation product of the tire rubber antioxidant 6PPD. This implies toxicological relevance for burned-off tire rubber residues to aquatic species.
In U.S. Pacific Northwest coho salmon (Oncorhynchus kisutch), stormwater exposure annually causes unexplained acute mortality when adult salmon migrate to urban creeks to reproduce. By investigating this phenomenon, we identified a highly toxic quinone transformation product of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD), a globally ubiquitous tire rubber antioxidant. Retrospective analysis of representative roadway runoff and stormwater-affected creeks of the U.S. West Coast indicated widespread occurrence of 6PPD-quinone (<0.3 to 19 micrograms per liter) at toxic concentrations (median lethal concentration of 0.8 +/- 0.16 micrograms per liter). These results reveal unanticipated risks of 6PPD antioxidants to an aquatic species and imply toxicological relevance for dissipated tire rubber residues.
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