期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 9, 页码 6012-6021出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c01042
关键词
-
资金
- National Natural Science Foundation of China [42077118]
- National Key Research and Development Program of China [2020YFC1808000]
The study investigates the size distribution of microplastics in the soil environment, revealing trends in the size changes of microplastics under different land use settings and proposing conditional aging as a controlling factor for the size distribution. The model is suitable for describing the size distribution of microplastics from different sources and aging processes, and can be used for various research purposes such as source identification, transport modeling, and risk assessment.
Microplastics (MPs) are drawing increasing attention from the international community due to their potential threats to the ecosystem and human health. Although their occurrence and spatial distribution have been extensively studied in recent years, the relationship between their abundance and sizes remains unclear. Moreover, the underlying mechanisms dominating their size distribution have rarely been explored. In the present study, we developed a novel conditional fragmentation model to describe MP size distribution in the soil environment. It is proposed that the distribution of MPs is not a coincidence but controlled by conditional aging. The applicability of this model was tested using data collected from different land use settings in Beijing, China. A distinct downsizing phenomenon from fibers, films, and fragments to granules is observed. Undisturbed land use types accumulated larger sized MPs with higher stability, while human interference accelerated the fragmentation of MPs. Both morphological analysis and time-of-flight secondary ion mass spectroscopy (TOF-SIMS) observations provided direct evidence for the conditional fragmentation process. Furthermore, the model has proven to be suitable for describing the size distribution of MPs from various sources (including atmospheric deposition, transportation, and agriculture) and aging processes (such as mechanical abrasion, chemical oxidation, and photochemical transformation). It is proposed that this model can be used for various purposes in MP-related studies, especially source identification, transport modeling, and risk assessment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据