Seasonal pollution and surface characteristics of microplastics in surface water in the Wanzhou section of the Three Gorges Reservoir, China.

There have been a few reports on MP pollution in the TGR in recent years, showing an increasing trend in MP pollution with abundances of MPs of 1.36×10 7 items km −2 in surface water of the mainstream of the TGR, 1.19×10 7 items km −2 in Xiangxi River in 2015 (Zhang et al. 2015 ), 3.42×10 7 items km −2 in backwater areas of Xiangxi River in 2017 (Zhang et al. 2017 ), and 4.70±2.82×10 3 n m −3 in the mainstream of the TGR in 2018 (Di and Wang 2018 ).

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We considered P < 0.05 as significant and P < 0.01 as highly significant.

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