

FOLLOWUS
1.College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2.Chongqing Research Academy of Ecology and Environmental Sciences, Chongqing 401147, China
zubo@cqjtu.edu.cn
Received:24 December 2022,
Accepted:21 February 2023,
Online First:09 March 2023,
Published:03 January 2024
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LI Wang,ZU Bo,LIU Yiwei,et al.Research Paper Microplastics in sediment of the Three Gorges Reservoir: abundance and characteristics under different environmental conditions[J].Journal of Oceanology and Limnology,2024,42(01):101-112.
LI Wang,ZU Bo,LIU Yiwei,et al.Research Paper Microplastics in sediment of the Three Gorges Reservoir: abundance and characteristics under different environmental conditions[J].Journal of Oceanology and Limnology,2024,42(01):101-112. DOI: 10.1007/s00343-023-2397-x.
Freshwater microplastic pollution is an urgent issue of global concern
and research on the distribution in reservoirs is lacking. We investigated the microplastic pollution levels in wet sediments collected from the Three Gorges Reservoir
the largest reservoir of China. Results show that microplastics were ubiquitous in the sediments of the Three Gorges Reservoir
and their abundance ranged from 59 to 276 pp/kg (plastic particles per kg
dry weight). Economic development and total population were important factors affecting the spatial heterogeneity of microplastic abundance
and the contribution of large cities along the reservoir to microplastic pollution should be paid with more attention. Fibrous microplastics were the most abundant type of microplastic particles in reservoir sediments
whereas polystyrene
polypropylene
and polyamide were the main types of polymers. The apparent spatial heterogeneity in morphology and color of microplastics is attributed to different anthropogenic or land-based pollution sources. Moreover
the accumulation of microplastics near the inlet of tributaries reflects the role of potential contributors of tributaries. More importantly
multiple bisphenols (BPs) and heavy metals detected at the microplastic surfaces indicate that microplastics can act as carriers of these pollutants in the environment in the same way as sediments did
which may alter the environmental fate and toxicity of these pollutants. Therefore
we conclude that the Three Gorges Reservoir had been contaminated with microplastics
which posed a stress risk for organisms who ingest them along with their associated pollutants (BPs
heavy metals).
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