期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 779, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.146589
关键词
Microplastics; Horizontal and vertical profiles; Size distribution; The Haihe River; Northern China
资金
- National Natural Science Foundation Committee of China [41991311]
- National Key Research and Development Program of China [2019YFC1804204]
- China Scholarship Council
This study investigated the vertical distribution and composition of microplastics in the water columns and surface sediments of an urban seagoing river in northern China. The results showed that microplastic abundance in the bottom water was significantly higher than in the surface and intermediate waters. The study highlights the importance of considering microplastics in bottom water when assessing overall abundance in aquatic environments.
Studies focused only on surface water may underestimate microplastic abundance in aquatic environments. This was the first survey to investigate the vertical (surface, intermediate, and bottom waters) distribution and com-position of microplastics (MPs) in the water columns and surface sediments collected from an urban seagoing river in northern China. Microplastic abundance in the water columns ranged from 5.6 to 31.4 items.L-1 and from 2141 to 10,035 items.kg(-1) dry weight (dw) in the surface sediments. Polyethylene dominated throughout the water columns to the surface sediments, in which low- and high-density polyethylene (LDPE and HDPE) were dominant in the water columns and surface sediments, respectively. The dominant shape of MPs was fibers/lines in both the water column and the surface sediment samples. Different from the estimations, the average abundance of MPs in the surface and intermediate waters was significantly lower (p < 0.01) than that in the bottom water, which may be due to the resuspension of small-sized MPs in the bottom water. As the MPs size increased, their vertical distributions in the water columns were more affected by the water depth. The results showed that MPs were detained in the water columns of river system, and the high concentrations of MPs in the bottom water could not be neglected. (C) 2021 Elsevier B.V. All rights reserved.
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