文章基本信息

标题：Catchment-wide flooding significantly altered microplastics organization in the hydro-fluctuation belt of the reservoir
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作者：Yalan Chen ; Bo Gao ; Dongyu Xu 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：6
页码：1-16
DOI：10.1016/j.isci.2022.104401
语种：English
出版社：Elsevier
摘要：SummaryHydro-fluctuation belt (HFB) is the most sensitive area of a large reservoir. This research aimed to identify the impact of catastrophic flooding on the local microplastics organization in the HFB soil of the Three Gorges Reservoir, the largest reservoir in China. We found that the catchment-wide flooding efficiently alleviated the local microplastics abundance from 7,633 to 4,875 items/kg (from 44 to 18 mg/kg) but added to the pollution risk in the reservoir body. After flooding, the overall size distribution of local microplastics was minimally altered. Interestingly, the preferential retention of the small-sized polyethylene was found in HFB after flooding. Approximately 5.0×1014items (∼2,360 tons) of microplastics were evacuated into the reservoir, equivalent to 15.8 wt% of the plastic flux of the Yangtze River into the ocean. We observed that HFB is a significant source of local microplastics in reservoir, and the long-term source–sink transformation mechanism in the HFB should be further investigated.Graphical abstractDisplay OmittedHighlights•Microplastics were detected across all sites in hydro-fluctuation belt (HFB) soil•Flooding efficiently reduced local microplastics in HFB soil•Catastrophic flooding induced selective retention of microplastics in HFB soil•HFB soil was a significant source of microplastics in the reservoir basinEarth sciences; Environmental science; Environmental chemistry; Pollution