Migration of microplastics in hyporheic zone sediments: Beiluo River, China

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-09-26 DOI:10.1007/s12665-025-12574-w

Yan Zhang, Mingchang Guan, Peng Shi, Jinxi Song, Lingzhou Cui

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引用次数: 0

Abstract

Microplastics (MPs) are plastic particles smaller than 5 mm that settle from surface waters into sediments. They can then be transferred to deep sediments via hyporheic exchange. Most studies on MPs in hyporheic zone sediments have been Limited to surface sediments. This study investigated the pollution, sources, and migration modes of MPs in sediments at various depths within the hyporheic zone of the Beiluo River. MPs were present in the surface water and sediments at different depths in the hyporheic zone. The average abundances of MPs in surface water and surface, middle, and deep sediments were 12 items·L⁻¹, 313 items·kg⁻¹, 206 items·kg⁻¹, and 166 items·kg⁻¹, respectively. The abundance of MPs in the sediments decreased with increasing depth. The physical characteristics of MPs were mainly fibrous, a small size (0.05–0.50 mm), and a blue color. The main polymer types of MPs were PE, PP, and PET. The main sources of MP pollution in the Beiluo River Basin were washing wastewater and agricultural mulch. Small MPs primarily migrated via hyporheic exchange. This process strongly influenced their vertical spatial distribution. The results of this study provide a basis for further research on the effects of hyporheic exchange on the vertical distribution of MPs in sediments.

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北罗江沉积物中微塑料的迁移研究

微塑料（MPs）是指从地表水沉降到沉积物中的小于5毫米的塑料颗粒。然后它们可以通过潜流交换转移到深层沉积物中。对深海带沉积物中MPs的研究大多局限于表层沉积物。本文研究了北罗江潜流带不同深度沉积物中MPs的污染、来源和迁移方式。MPs存在于潜流带不同深度的地表水和沉积物中。MPs在地表水、表层、中层和深层沉积物中的平均丰度分别为12项·L−1、313项·kg−1、206项·kg−1和166项·kg−1。沉积物中MPs丰度随深度增加而降低。MPs的物理特性主要是纤维状，尺寸小（0.05-0.50 mm），颜色为蓝色。MPs的主要聚合物类型是PE、PP和PET。北罗河流域的主要污染源是洗涤废水和农业地膜。小议员主要是通过隐性交换迁移的。这一过程强烈影响了它们的垂直空间分布。本研究结果为进一步研究潜流交换对沉积物中MPs垂直分布的影响提供了基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.