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Bridging the gap: Environmentally relevant aging of microplastics under laboratory conditions
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Researchers reviewed approaches to simulate environmental aging of microplastics under controlled laboratory conditions, evaluating how well lab protocols replicate real-world weathering. The review identified gaps between laboratory aging methods and actual outdoor weathering outcomes, recommending more environmentally realistic test conditions.
Microplastics (MPs) are characterized by a great diversity in terms of size, shape and chemical composition. In addition, environmental plastics undergo the processes of aging, altering their composition and properties. Many studies have focused on simulating the environmental aging of MPs mainly using accelerated aging by UV radiation. MPs also undergo biotic aging in the aquatic environment and biofilm are likely to develop on their surface. This type of aging, however, is not yet well understood. Some studies use well-defined algal/bacterial cultures under controlled conditions, while others age them in the natural environment where conditions are not controlled at all. In response to the need to produce biotically aged MPs for laboratory research, we have developed a method of aging MPs in natural stream water under controlled conditions that combines the best of the latter two approaches – aging is driven by natural microbial consortia in stream water but under controlled laboratory conditions. We have been using this method in laboratory research for the last six years. This method, in combination with innovative assessments of biofilm development, enable us to observe the growth phase of biofilms on microplastics, to compare biofilm development in terms of their structural and functional properties on different polymers, to evaluate how biofilms affect the toxicity and bioavailability of MPs to aquatic organisms, and to show how the shape of MPs influences biofilm growth and how biotic aging affects different properties of MPs such as shape, morphology, density, and adsorption properties. The results obtained contribute significantly to the understanding of the biotic aging of MPs and their effects, behavior, and fate in the environment. Also see: https://micro2024.sciencesconf.org/558700/document
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Bridging the gap: Environmentally relevant aging of microplastics under laboratory conditions
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This study compared laboratory-simulated aging of microplastics to outdoor weathering under real environmental conditions, aiming to determine whether accelerated lab protocols produce realistic analogs of environmentally aged particles. Significant differences were found between lab-aged and outdoor-aged microplastics, highlighting a methodological gap in the field.
Weathering pathways and protocols for environmentally relevant microplastics and nanoplastics: What are we missing?
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This review highlights a major gap in microplastics research: most lab studies use brand-new, pristine plastic particles, but microplastics in the real world have been weathered by sunlight, water, and biological activity. Weathered microplastics behave differently, releasing more chemicals and interacting with organisms in ways that fresh plastics do not. Only about 10% of published studies have used aged microplastics, meaning current risk assessments may not reflect the true dangers of environmental microplastic exposure.
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Researchers reviewed how microplastics change physically and chemically over time in the environment — a process called 'aging' — and found that standard lab methods for detecting microplastics were mostly developed using fresh, unaged plastics, making it harder to accurately measure real-world contamination. Improved analytical methods that account for aged microplastics are needed for reliable environmental assessment.
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