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Review of the artificially-accelerated aging technology and ecological risk of microplastics

Liu, Peng, Shi, Yanqi, Wu, Xiaowei, Wang, Hanyu, Huang, Hexinyue, Guo, Xuetao, Gao, Shixiang·2021·Science of The Total Environment

Abstract

After being discarded into the environment, the microplastics (MPs) will undergo weathering effects. However, the low degradation rate of MPs in natural processes greatly limits the understanding of long-term aging behavior. By critically reviewing 82 articles in Web of Science from 2015 to 2020, the paper summarized different laboratory technologies including light irradiation, chemical oxidation, heat treatment and γ-ray irradiation to simulate and accelerate the aging of MPs, and evaluated the feasibility by comparison with natural processes. The advantages of laboratory technologies are that aging conditions can be artificially controlled and that the labor and time costs can be saved, whereas the laboratory system is too simple to simulate complex aging processes in the environment. We further reviewed the potential impacts of aging process on the risks of MPs (i.e. physical injury, combined toxicity with external pollutants and chemical risk of additives and low-molecular products). The overall risks are seemingly enhanced by aging process due to the high ingestion by organisms, the strong interaction with pollutants and the release of MP-derived organic compounds. Further studies on the aging behavior of MPs should be focused on the laboratory techniques that can simulate multiple processes of natural aging, the long-term fragmentation behavior of MPs, the effect of aging on growth rate of biofilm in MPs and ingestion property by organisms, and the relationship between aging property of MPs and release rate of chemicals in leachates.

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Metadata

Authors
Liu, P., Shi, Y., Wu, X., Wang, H., Huang, H., Guo, X., & Gao, S.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-05
Volume
768
Pages
144969
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3127564628
Cited by
223
References
24
FWCI
8.23
Type
journal article
Language
en
Open access
closed
Funders
  • China Postdoctoral Science Foundation (2020M680160)
  • National Natural Science Foundation of China (21876076)

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Liu, P., Shi, Y., Wu, X., Wang, H., Huang, H., Guo, X., & Gao, S. (2021). Review of the artificially-accelerated aging technology and ecological risk of microplastics. Science of The Total Environment. https://doi.org/10.1016/j.scitotenv.2021.144969

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