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Increased Aquatic Toxicity of Tire Wear Particles Following Oxidative Aging: Mechanism Insights into Matrix Loosening and Transformation Products
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Tiny bits of tire rubber wash into rivers and lakes, and this study found that sunlight and ozone exposure make them even more toxic over time, not less. As the particles break down, they release new chemical byproducts that made up nearly half of the harmful effects seen in zebrafish embryos, even at very low, real-world exposure levels. This matters because it suggests weathered tire particles in waterways could pose bigger risks to aquatic life (and potentially the food chain) than current safety testing accounts for, since most assessments don't look for these newly formed breakdown chemicals.
Tire wear particles (TWPs) are a significant component of traffic-related contaminants in aquatic environment. However, the mechanisms by which environmental aging reshapes their toxicological profile are not well understood. In this study, we mechanistically investigated the effects of ultraviolet (UV) and ozone aging on TWP leaching behavior and zebrafish embryotoxicity. UV and ozone aging enhance TWP embryotoxicity, and aged TWPs exhibit sustained developmental toxicity, even at environmentally relevant 1-10% dilutions, indicating a significantly lowered threshold for aquatic hazard. This toxicological surge is fundamentally driven by particle matrix loosening. Oxidative degradation of the polymer backbone reduces mass-transfer resistance, thereby accelerating pollutant release kinetics by up to twofold. Non-target screening (FTICR-MS) further reveals that, while legacy additives are depleted, aging generates a large suite of highly oxygenated transformation products (TPs). These newly formed compounds emerge as dominant drivers of risk, accounting for nearly half (45%) of the total calculated toxic burden in ozone-aged TWPs leachates. Together, these results demonstrate that environmental weathering transforms TWPs from relatively inert solids into highly mobile and persistent chemical vectors. This underscores the necessity of incorporating non-target oxidation products into risk assessment frameworks to prevent severely underestimating the ecological hazards posed by weathered tire-derived contaminants.
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Researchers tested how sunlight exposure changes the chemical composition and toxicity of substances leaching from tire tread particles in water. They found that light-exposed tire particle leachates were significantly more toxic to zebrafish embryos, causing developmental abnormalities and reduced survival at lower concentrations. The study suggests that the environmental weathering of tire-derived microplastics can make their chemical releases more hazardous to aquatic life over time.
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A study on the aquatic degradation of tire wear particles: Impact of environmental factors and material formulations
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This study assessed how tire wear particles degrade in freshwater environments under varying environmental conditions including UV radiation and water chemistry. The degradation process alters particle properties in ways that may increase toxicity to aquatic organisms.
Deciphering the aging-driven transformation of tire wear particles: Reshaping adsorption, leaching dynamics, and biointerfacial impacts
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Researchers reviewed how environmental aging — via photooxidation, mechanical abrasion, and biodegradation — transforms tire wear particles by increasing surface area and polarity, promoting additive leaching and the formation of reactive free radicals, collectively amplifying ecological toxicity beyond what fresh particles alone would cause.
Behavior of compounds leached from tire tread particles under simulated sunlight exposure
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This study examined what happens to chemicals that leach from tire tread particles when exposed to sunlight. While sunlight broke down about a third of the leached compounds, it also created new transformation products, some of which may be more harmful than the originals. Since tire particles are a major source of microplastics in waterways, understanding how their chemicals change in sunlight is important for assessing real-world health risks.
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