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A critical review of tire wear particles aging and ecotoxicological consequences in terrestrial environments: Insights into environmentally persistent free radicals
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This review synthesizes evidence on how tire wear particles age in terrestrial environments and the resulting ecological consequences. Researchers found that UV-induced aging generates environmentally persistent free radicals and reactive oxygen species that amplify soil toxicity, while biodegradation may reduce some risks. The study highlights that characterizing aged tire wear particles remains difficult due to their compositional complexity and calls for standardized analytical methods.
Tire wear particles (TWPs), a major microplastic pollutant with global emissions estimated at 5.9 million tons annually, accumulate in terrestrial ecosystems, where aging processes critically influence their fate and ecotoxicity. This critical review synthesizes evidence on TWPs aging via oxidation, shear stress, and biodegradation, which alter their physicochemical properties. Aging processes, particularly UV-induced cleavage, generates environmentally persistent free radicals (EPFRs), often exacerbated by additives like carbon black and zinc oxide (ZnO). Key findings reveal that photoaging amplifies soil toxicity through reactive oxygen species (ROS) and EPFRs formation, as well as additive release, whereas biodegradation may attenuate risks by reducing contaminant bioavailability. Characterizing aged TWPs challenging due to matrix interferences and compositional complexity that hinder the reliability of analytical techniques such as Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Addressing these limitations requires standardized analytical protocols, long-term field investigations, and mechanistic models capable of capturing TWPs transformations and interactions within soil-plant systems to better inform effective pollution mitigation strategies.
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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.
In Vitro Assessment Reveals the Effects of Environmentally Persistent Free Radicals on the Toxicity of Photoaged Tire Wear Particles
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Researchers examined how tire wear particles change when exposed to sunlight and found that the aging process generates environmentally persistent free radicals on their surfaces. These radicals significantly increased the toxicity of the particles in laboratory cell tests, causing oxidative stress and DNA damage. The study suggests that weathered tire particles may be more harmful than freshly released ones, adding a new dimension to microplastic pollution concerns.
Aging of tire and road wear particles in terrestrial and freshwater environments - A review on processes, testing, analysis and impact.
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This review examines how tire and road wear particles (TRWPs) change after being released into the environment, covering processes like oxidation, UV degradation, and biodegradation. Researchers found that while some tire-aging knowledge applies to TRWPs, quantitative understanding of environmental aging remains largely lacking. The review outlines key knowledge gaps and next steps for future TRWP aging studies.
Effect of UV exposure and natural aging on the in vitro PAHs bioaccessibility associated with tire wear particles in soil
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Researchers examined how UV exposure and natural aging change the ability of tire wear particles to release polycyclic aromatic hydrocarbons in soil. They found that UV aging increased the surface reactivity of the particles and altered how readily these toxic compounds could be absorbed by living organisms. The study suggests that weathered tire particles in roadside soils may pose greater health risks than fresh ones.
A study on the aquatic degradation of tire wear particles: Impact of environmental factors and material formulations
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This study investigated how tire wear particles degrade in aquatic environments, examining the effects of environmental factors such as UV exposure and water chemistry on particle breakdown. The results showed that aquatic degradation alters tire wear particles in ways that may increase their ecotoxicological risk.
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