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[Temporal and Spatial Distribution and Risk Assessment of Microplastics in Multiple Media of an Urban River].
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Researchers collected water and sediment samples from the Guanzhong section of the Weihe River Basin during wet and dry seasons to characterize the temporal and spatial distribution and risk of microplastics in an urban river system. Using density flotation and multiple analytical methods, they systematically documented microplastic abundance, morphology, and polymer composition across multiple environmental media.
The increasingly serious pollution of microplastics （MPs） in urban rivers has attracted global attention. At present, there is a lack of research on the spatiotemporal distribution of microplastics in inland rivers. In order to understand the spatiotemporal dynamic characteristics of microplastics in urban rivers, water and sediment samples were collected from the Guanzhong section of the Weihe River Basin during the wet and dry seasons. The abundance, morphological characteristics, and polymer types of microplastics in the sediment were systematically studied using multiple density flotation extraction and spectral analysis methods to clarify the spatiotemporal distribution and migration characteristics of microplastics in the watershed. The results showed that the variation range of microplastics in river water was 1.02-10.32 items·L-1, and the variation range of microplastics in sediment was 220.30-2 840.40 items·kg-1. Both surface water and sediment showed significantly higher abundance during the dry season than during the wet season （P<0.05）. The particle size of microplastics was mainly small particles with sizes of <0.1 mm and 0.5-1 mm, and fibers were the main shape of microplastics in the sediments. Polyethylene （PE） and polypropylene （PP） were the main types of microplastics. The overall pollution risk was mild pollution. The results of this study can provide some reference for the scientific understanding of microplastic pollution in urban rivers and the formulation of plastic control measures.
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[Microplastic Pollution Status and Ecological Risk Evaluation in Weihe River].
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This Chinese study characterized microplastic abundance, shapes, sizes, colors, and polymer types in the Weihe River in northwest China. The findings document significant microplastic contamination in a major regional river that drains one of China's most densely populated agricultural areas, raising concerns about both ecosystem and human health.
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Researchers investigated microplastic dynamics in an urban river network in eastern China, finding abundances of 2.3 to 104.6 particles per liter that were significantly higher during wet seasons and concentrated near commercial, industrial, and wastewater discharge areas.
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This study assessed microplastic pollution across an urban river network in China, finding that land-use type and water physicochemical properties jointly influence microplastic distribution, with industrial and residential areas contributing highest loads.
[Composition and Distribution of Microplastics in the Water and Sediments of Urban Rivers in Beijing].
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Researchers measured microplastic concentrations in water and sediments from eight sampling points along urban rivers in Beijing. Microplastics were widespread, with fibers being the most common type, likely from laundry and textile sources. Urban rivers are important conduits that transport microplastics from cities into larger water bodies and ultimately the ocean.
Spatial–Temporal Distribution and Ecological Risk Assessment of Microplastics in the Shiwuli River
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Researchers mapped the spatial and temporal distribution of microplastics in water and sediment of the Shiwuli River, an urban river in Hefei, China, across flood and non-flood seasons. Microplastic concentrations were higher during flood season and at downstream sites influenced by urban runoff and wastewater. Ecological risk assessment indicated moderate to high polymer-related risks, pointing to urban rivers as significant sources of microplastic pollution that require targeted management.
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