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Toxicological effects of microplastic fibers from different disposable face masks on Caenorhabditis elegans
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Researchers tested the toxic effects of microplastic fibers from three types of disposable face masks on the soil-dwelling roundworm C. elegans. Exposure to microplastics from KF94 masks and particulate respirators caused the most significant harm, including reduced growth, impaired reproduction, and increased oxidative stress. The findings highlight that pandemic-related mask waste breaking down in soil environments could pose risks to organisms that live there.
During the COVID-19 pandemic, the widespread use of disposable face masks generated substantial waste, much of which ends up in terrestrial environments. However, the impact of this discarded material on soil ecosystems remains poorly understood. This study investigated the toxicological effects of microplastics derived from three types of disposable face masks (KF94, medical, and particulate respirator) and a polypropylene reference material on the soil nematode Caenorhabditis elegans (C. elegans). Exposure to 0.3 % (w/w, microplastic/soil) microplastics from KF94 masks and particulate respirators significantly reduced offspring numbers. Mass spectrometry (MS)-based metabolomic analysis revealed distinct metabolic alterations in C. elegans exposed to microplastics. Both KF94 masks and particulate respirators commonly disrupted the polyamine biosynthesis pathway but exhibited differing impacts on associated metabolites. High-resolution MS analysis of plastic additives extracted from the masks suggested that these differential metabolic changes could be attributed to various additives, including phthalates known to exhibit reproductive toxicity in C. elegans. These findings highlight the potential risk of plastic additives from disposed face masks disrupting soil ecosystems, raising concerns about their long-term environmental impact on soil health and biodiversity.
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Post COVID-19 pandemic: Biofragmentation and soil ecotoxicological effects of microplastics derived from face masks
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Researchers studied how meltblown face mask filters fragment into nanofibers in soil and found that the resulting particles inhibited reproduction in springtails, stunted their growth, and impaired reproductive function in earthworms. The study estimated that nanofiber generation from mask fragments is likely to occur in soils following the pandemic. The findings emphasize the importance of proper mask disposal to prevent long-term microplastic damage to soil ecosystems.
The environmental impact of mask-derived microplastics on soil ecosystems
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Researchers reviewed how discarded face masks from the COVID-19 pandemic break down into microplastics and affect soil ecosystems. They found that mask-derived microplastics alter soil structure, change microbial community composition, and can release harmful chemical additives into the ground. The study suggests that the massive increase in mask waste during the pandemic has created a new and significant source of soil microplastic pollution.
Microplastics Effects on Reproduction and Body Length of the Soil-Dwelling Nematode Caenorhabditis elegans
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Researchers compared the effects of conventional low-density polyethylene microplastics and biodegradable polymer microplastics on reproduction and body length in the soil nematode C. elegans. The study found that microplastic exposure affected these organisms, highlighting that even biodegradable plastics may pose risks to soil-dwelling invertebrates and that terrestrial microplastic toxicity deserves greater research attention.
Effects of microplastics from disposable medical masks on terrestrial invertebrates
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Researchers investigated how microplastics from disposable medical masks affect soil invertebrates including woodlice, mealworms, and enchytraeids over 21 days. While the microplastics did not cause severe effects on survival or reproduction, the study found transient immune responses in woodlice and changes in energy metabolism in mealworms, particularly from outer-layer mask particles. The long-term fitness implications of these sublethal responses remain unclear.
Ecological risk of microplastics in soil ecosystem: Insights from nematodes
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Lab tests with roundworms (including C. elegans) and field studies of riverbank soils along the Yangtze examined how microplastics affect soil life. Microplastics harmed worms above certain levels, changed their behavior, and altered soil microbial activity and energy flow, with effects depending on plastic type, aging and environmental conditions.
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