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An investigation into the aging mechanism of disposable face masks and the interaction between different influencing factors
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Researchers found that a single disposable face mask can release between 39,000 and 938,000 microplastic particles as it breaks down over three months under environmental conditions like UV light and saltwater. The aging masks also released heavy metals and absorbed other pollutants like antibiotics from their surroundings. This highlights that improperly discarded face masks are a significant and growing source of microplastic and chemical pollution.
In the natural environment, a symphony of environmental factors including sunlight exposure, current fluctuations, sodium chloride concentrations, and sediment dynamics intertwine, potentially magnifying the impacts on the aging process of disposable face masks (DFMs), thus escalating environmental risks. Employing Regular Two-Level Factorial Design, the study scrutinized interactive impacts of ultraviolet radiation, sand abrasion, acetic acid exposure, sodium chloride levels, and mechanical agitation on mask aging. Aging mechanisms and environmental risks linked with DFMs were elucidated through two-dimensional correlation analyses and risk index method. Following a simulated aging duration of three months, a single mask exhibited the propensity to release a substantial quantity of microplastics, ranging from 38,800 ± 360 to 938,400 ± 529 particles, and heavy metals, with concentrations from 0.06 ± 0.02 μg/g (Pb) to 29.01 ± 1.83 μg/g (Zn). Besides, specific contaminants such as zinc ions (24.24 μg/g), chromium (VI) (4.20 μg/g), thallium (I) (0.92 μg/g), tetracycline (0.51 μg/g), and acenaphthene (1.73 μg/g) can be adsorbed significantly by aged masks. The study elucidates pivotal role of interactions between ultraviolet radiation and acetic acid exposure in exacerbating the environmental risks associated with masks, while emphasizing the pronounced influence of many other interactions. The research provides a comprehensive understanding of the intricate aging processes and ensuing environmental risks posed by DFMs, offering valuable insights essential for developing sustainable management strategies in aquatic ecosystems.
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A multi-analytical approach to investigate UV-induced degradation and micro/nanoparticle release from disposable plastic face masks
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Researchers subjected disposable face masks to long-term UV-B aging in water to assess degradation and pollutant release. Aging caused structural fragmentation, surface oxidation, and the release of chemical additives and micro/nano-plastic particles, demonstrating that improperly disposed masks become a persistent source of both MPs and chemical contaminants.
Release study of microplastic fibres and heavy metals from disposable surgical face masks in aqueous medium: the effect of physio-chemical factors and shear forces
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Researchers studied the release of microplastic fibers and heavy metals from disposable surgical face masks in water under various conditions. They found that physical factors like agitation and UV exposure significantly increased the rate of microplastic and metal release from the masks. The findings raise concerns about the environmental impact of discarded face masks as they degrade in aquatic systems.
Release of microplastics from disposable face mask in tropical climate
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Researchers found that disposable face masks — a major source of pandemic waste — release hundreds of microplastic particles per mask into water, with release rates increasing significantly at higher temperatures and with longer aging, raising concerns about their contribution to environmental plastic pollution.
The behavior of microplastics and nanoplastics release from UV-aged masks in the water
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UV irradiation of three types of disposable masks in water progressively damaged their structure over 15-30 days, releasing microplastics and nanoplastics at rates that increased exponentially with irradiation time, with an estimated release of up to 3.66 x 10^10 particles per mask over 1-3 years of environmental exposure.
Release kinetics of microplastics from disposable face masks into the aqueous environment
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Researchers measured microplastic release from three types of disposable face masks into water over 24 hours, characterizing the release kinetics and identifying mask type and environmental conditions as key factors affecting microplastic shedding rates.
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