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. Learn all about how ageing affects dog behaviour at nighttime. 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. physical injury, combined toxicity with external pollutants and chemical risk of additives and low-molecular products).
We further reviewed the potential impacts of aging process on the risks of MPs (i.e. 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.
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. However, the low degradation rate of MPs in natural processes greatly limits the understanding of long-term aging behavior. After being discarded into the environment, the microplastics (MPs) will undergo weathering effects.
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