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Leachates from tyres induce acute toxicity in fish, influence of tyre type and age
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Researchers tested the acute toxicity of leachates from different tire types and ages on fish, finding that tire leachates cause dose-dependent mortality. The toxicity varied with tire composition and age, with newer tire formulations in some cases producing more harmful leachates.
Tyres are an important source of microplastics (so called tyre wear particles (TWP)) and chemicals in the environment. Given their composition and the quantity produced every year, tyres are of particular concern in terms of the effects they could have on species, especially in marine ecosystems. Specifically, it has already been shown that a chemical derived from tyres caused the death of Coho salmon (Oncorhynchus kisutch) in urbanized watersheds. In this work, we evaluated the acute toxicity of leachates obtained from three different tyres (1 new and 2 road-worn tyres) on embryonic and larval stages of marine medaka (Oryzias melastigma). Leachates were obtained from millimetric pieces of cut tyres incubated for 14 days in filtered seawater (25‰). The exposure lasted 12 days with hatching at 10 days and different endpoints were considered: mortality, developmental defects, morphology of eggs and larvae, heartbeats, hatching and larval swimming activity. These experiments revealed a dose-dependent effect of the leachates on early life stages of marine medaka for all endpoints considered with a LOEC obtained with 10 Also see: https://micro2024.sciencesconf.org/559100/document
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Leachates from tyres induce acute toxicity in fish, influence of tyre type and age
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This study examined how leachates from tires induce acute toxicity in fish, comparing effects across different tire types and ages to assess how composition and weathering influence leachate hazard. Tire leachates caused acute toxicity in fish at concentrations relevant to roadway runoff, with leachate toxicity varying significantly by tire type and degree of weathering.
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Researchers quantified how leachate toxicity from tire wear particles (TWP) changes with weathering over time, using aging experiments and toxicity bioassays to map the temporal dynamics of toxic compound release. Toxicity peaked during early weathering as soluble compounds leached rapidly, then declined, providing data relevant to risk assessment of TWP in stormwater runoff.
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Researchers investigated the toxicity of tire wear particles and their chemical leachates on bacteria in marine sediments. The study found that aged tire wear particles were more toxic than pristine ones, and that leachates were even more harmful than the particles themselves, with zinc identified as the primary toxicity-causing substance.
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