To understand the pollution characteristics and distributions of microplastics in the Dagu River, an important inland river that flows to Jiaozhou Bay, the abundance, particle size, shape, color, and polymer type of microplastics in the surface waters and floodplain sediments were investigated. The results showed that the abundance of microplastics in the surface waters varied be-tween 0.68 and 3.96 items L?1. The abundance of microplastics in the floodplain sediments varied between 115.5 and 495 items kg?1. The distribution of microplastics in the river has obvious characteristics: 1) The abundance of microplastics downstream was signifi-cantly higher than that upstream. 2) The abundance of microplastics decreased significantly in the estuary. 3) The abundance of mi-croplastics was higher in densely populated areas. 4) Factors such as effluent discharge from sewage treatment plants and inflow of tributaries affect the abundance of microplastics in rivers. The main polymer types of microplastics were polypropylene (PP), poly-ethylene (PE), and polyvinyl chloride (PVC). Both the abundance and polymer types of microplastics show a positive correlation between the surface waters and floodplain sediment samples, indicating that the microplastics in surface waters and floodplain sedi-ments come from the same source. The present study demonstrates that the abundance, distribution, and sources of microplastics might be affected by geology, hydrogeology, land use types, and anthropogenic activities. This study provides basic data for the study of microplastics in rivers and provides a reference for the establishment of microplastic control measures.

JIAO Jie;CHEN Gang;YANG Zechuan;LI Zhengyan;HU Hong

College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;College of Marine Life Science,Ocean University of China,Qingdao 266100,China

中国海洋大学学报（自然科学英文版）

[1]JIAO Jie;CHEN Gang;YANG Zechuan;LI Zhengyan;HU Hong-.Microplastics in Surface Waters and Floodplain Sediments of the Dagu River in the Jiaodong Peninsula, China)[J].中国海洋大学学报（自然科学英文版）,2022(06):1538-1548

Floodplain,Dagu,croplastics,hydrogeology

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