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Toxicity of micro and nano tire particles and leachate for model freshwater organisms.

TitleToxicity of micro and nano tire particles and leachate for model freshwater organisms.
Publication TypeJournal Article
Year of Publication2022
AuthorsCunningham B, Harper B, Brander S, Harper S
JournalJ Hazard Mater
Date Published2022 May 05
KeywordsAnimals, Daphnia, Fresh Water, Microplastics, Plastics, Water Pollutants, Chemical, Zebrafish

Environmental sampling has documented a diversity of microplastics, including high levels of black rubber- generally identified as tire debris. Though organisms have been shown to ingest tire particles (TPs), past research focused on toxicity of leachate alone, overlooking potential effects of particles. To address these gaps, we assessed the toxicity of micro (1-20 µm) and nano (<1 µm) TPs for two model organisms, embryonic Zebrafish Danio rerio and the crustacean Daphnia magna. To assess effects on development, Zebrafish embryos were exposed to concentrations of TPs or leachate ranging from 0 to 3.0 × 10 particles/ml and 0-100% respectively (n = 4). Greater mortality and sublethal malformations were observed following nano TP and leachate exposures as compared to micro TPs. Unique abnormalities between the exposures indicates that there is both chemical and particle-specific toxicity. We also observed D. magna mortality following a 48 h exposure of neonate to TPs or leachate, ranging from 0 to 3.3 × 10 particles/ml and 0-100% respectively (n = 3). Though, particle-enhancement of toxicity was observed for both Zebrafish and D. magna, overall sensitivity to TPs differed. It is important to identify differential toxicities across species to achieve an understanding of the environmental impacts of TPs and the chemicals they leach.

Alternate JournalJ Hazard Mater
PubMed ID35236035
Project Reference: 
Nano-scale Plastic Aquatic Toxicology

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