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Horizontal and vertical distribution of microplastics in dam reservoir after impoundment.
Liu, Yixuan; Cao, Weigang; Hu, Yue; Zhang, Jie; Shen, Weibo.
Afiliación
  • Liu Y; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
  • Cao W; Science and Technology Resource Coordination Center of Hanzhong, Hanzhong, Shaanxi 723000, PR China.
  • Hu Y; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
  • Zhang J; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
  • Shen W; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, PR China. Electronic address: shenweibo@nwafu.edu.cn.
Sci Total Environ ; 832: 154962, 2022 Aug 01.
Article en En | MEDLINE | ID: mdl-35378186
In freshwater ecosystems, microplastics (MPs) are commonly found in reservoirs. However, limited information is available on the distribution of MPs in the reservoirs. In this study, we investigated the horizontal and vertical distribution characteristics of MPs in the Guanyingyan reservoir (the upper reaches of the Yangtze River, China) after impoundment and the influence of free-floating plant residues on the distribution of MPs. Results indicated that the MPs abundance in the horizontal distribution of the reservoir decreased significantly while the distance from the dam increased. The abundance of MPs in shoreline waters (average: 8.45 items L-1) was significantly higher than that in central waters (average: 4.80 items L-1). As for the vertical distribution, the percentages of fibers in the three water layers (surface, intermediate, and deep) have less variation when compared to other types of MPs. Besides, MPs who are less than 0.5 mm in size are the majority. With deeper underwater, there would be more MPs with particles smaller than 200 µm in size. At the same time, there would be fewer MPs with particles ranging from 200 to 500 µm in size. PS, PP, and PE are the main polymer types of surface water, while PVC, PE, and PET are the common type in deep water. In shoreline water, the dry weight of floating plant residues showed a positive correlation with microplastic abundance in different layers. As above said, this study confirmed that MPs in reservoirs after impoundment would tend to accumulate in the front section of the reservoir and the shoreline water. Besides, free-floating plant residues would accumulate in reservoirs, resulting in the sinking of MPs.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Microplásticos País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Microplásticos País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos