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Microplastics and nanoplastics released from a PPE mask under a simulated bushfire condition
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Researchers found that burning PPE face masks under simulated bushfire conditions releases significant quantities of microplastics and nanoplastics from polypropylene fibres, adding wildfire and incineration as underappreciated sources of plastic particle pollution.
Due to COVID-19, large amounts of personal protective equipment (PPE) have been used, and many PPE units are made of plastics, such as face masks. The masks can be burned naturally in a bushfire or artificially at the incineration plants, and release microplastics and nanoplastics from the mask plastic fibres. A fire can cause the plastic, such as polypropylene (PP) fibres, to be molten and stick to the solid surface, such as glass, soil, concrete or plant, as films or islands, due to the binding property of the molten plastic material. Once the films or islands are peeled off in the processes such as weathering, ageing, or treatment and clean-up, there are residuals leftover, which are identified as nanoplastics and microplastics via Raman imaging, with the significant release amount of ~1100 nanoplastics / 10 µm or ~11 billion / cm, and ~50 microplastics / 420 µm or ~12 million / cm. Moreover, surface group is deviated on the plastic surface, which can also be distinguished and visualised as well via Raman imaging, down to nano size. This test validates the Raman imaging approach to capture microplastics and nanoplastics, and also provides important information about the fate and transportation of PPE mask in the environment, particularly when subjected to a fire. Overall, Raman imaging can be an effective option to characterise the microplastics and nanoplastics, along with the deviated surface group.
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Researchers investigate how the surge in single-use face masks and personal protective equipment during the COVID-19 pandemic became a significant new source of micro- and nanoplastic pollution, tracing the environmental pathways from widespread PPE disposal to contamination of ecosystems.
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Researchers conducted smoldering laboratory experiments with PVC, PP, LDPE, PET, and PS plastics and used aerosol mass spectrometry to characterise the physical and chemical properties of nanoplastic particles emitted, finding that plastic burning generates large quantities of nanoplastics and thermo-oxidation products that represent a significant but poorly quantified global source of atmospheric nano-sized plastic particles.
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Researchers simulated real-world mask usage and found that commonly used face masks — including surgical and cloth types — shed measurable quantities of microplastic particles that could be inhaled by the wearer, raising concerns about respiratory exposure during prolonged mask use.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.