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61,005 resultsShowing papers similar to Spatial distribution and potential sources of microplastics in the Songhua River flowing through urban centers in Northeast China
ClearCharacteristics and distribution of microplastics in the surface water of the Songhua River in China
Microplastics were detected at all sampling sites along the Songhua River in northeast China, ranging from 1.09 to 15.97 items per liter with a mean of 5.72, and concentrations were highest near urban centers and lowest in upstream rural reaches, with fibers and fragments as the dominant morphologies.
Distribution characteristics of microplastics in urban rivers in Chengdu city: The influence of land-use type and population and related suggestions
Researchers surveyed microplastic concentrations in urban rivers of Chengdu, China, finding MP abundances of 20-763 items per liter in water and linking higher concentrations to dense residential areas and industrial land use. Polyethylene and polypropylene fibers dominated the MP assemblage, consistent with textile laundering and household waste as primary sources.
Microplastics profile in a typical urban river in Beijing
Researchers profiled microplastic pollution along the Qing River, a typical urban river in Beijing receiving effluent from four wastewater treatment plants, investigating how discharged microplastics distribute and transform as they move through an urban riverine system.
Distribution characteristics of microplastics in urban rivers of Songjiang District, Shanghai
Microplastics were found throughout urban river sections in Shanghai, China, with concentrations reflecting local population density and land use patterns. Urban rivers are a significant pathway for microplastic contamination flowing into coastal and marine environments.
Occurrence, potential sources, and ecological risk assessment of microplastics in the inland river basins in Northern China
Researchers surveyed microplastic pollution in a typical urban river system in Northern China, examining both surface water and sediment samples. They found that river sediments contained dramatically more microplastics than surface water, acting as a sink for this pollution, with polypropylene and polyethylene being the most common types. The study suggests that small fiber and fragment-shaped particles under 0.5 mm dominate these environments, likely originating from everyday plastic products and wastewater discharge.
Spatio-temporal distribution of microplastics in surface water of typical urban rivers in North China, risk assessment and influencing factors
Researchers measured microplastic levels in two urban rivers in North China across wet and dry seasons and found that concentrations generally increased from upstream to downstream. The most common plastics were polyethylene and polypropylene fibers, with natural factors dominating upstream and human activities driving pollution downstream. The study provides a reference for understanding how urbanization contributes to microplastic contamination in river systems.
Distribution and characteristics of microplastics in an urban river: The response to urban waste management
Microplastics were detected throughout surface water and sediments of an urban Chinese river (Nanming River) in both dry and wet seasons, with 25 different polymer types identified and the highest concentrations near sewage discharge points and plastic waste dump sites. The study shows that urban river management practices — particularly wastewater handling — are critical in controlling how much plastic reaches downstream ecosystems.
[Composition and Distribution of Microplastics in the Water and Sediments of Urban Rivers in Beijing].
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.
Microplastic pollution in sophisticated urban river systems: Combined influence of land-use types and physicochemical characteristics
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.
Spatiotemporal dynamics of microplastics in an urban river network area
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.
Measurement, quantification, and potential risk of microplastics in the mainstream of the Pearl River (Xijiang River) and its estuary, Southern China
Microplastic distribution was surveyed across the mainstream and estuary of China's Pearl River, finding higher concentrations near urban centers and establishing a detailed inventory of microplastic abundance, polymer types, and potential sources in this major waterway.
Characteristics and source-pathway of microplastics in freshwater system of China: A review
This national-scale review examines microplastic characteristics and source-pathway dynamics in Chinese freshwater systems including rivers, lakes, and reservoirs, synthesizing data showing that urban runoff, textile washing, and wastewater discharge are dominant sources. The authors identify key knowledge gaps in understanding microplastic transport from inland waters to the ocean in the world's largest plastic-producing country.
Distribution and characteristics of microplastics in urban waters of seven cities in the Tuojiang River basin, China
Microplastics were detected in water across all seven cities surveyed in the Tuojiang River basin of southwest China, with fiber the most common form and polypropylene the dominant polymer. Cities with greater industrial economic output had higher microplastic concentrations, linking manufacturing activity to freshwater plastic pollution.
Source identification of microplastics in highly urbanized river environments and its implications for watershed management
Researchers identified the sources and pathways of microplastics entering highly urbanized rivers in the Shenzhen Bay watershed. The study found that 61.6% of annual microplastic loads came from point sources, with textile washing fibers accounting for over 92% of those, while nonpoint source contributions dominated during periods of heavy rainfall.
Occurrence and characteristics of microplastics in the Haihe River: An investigation of a seagoing river flowing through a megacity in northern China
Microplastics were found throughout the Haihe River in northern China at concentrations of 0.69 to 74.95 items per square meter, with fibers dominant and polyethylene and polypropylene the most common polymers. Weathering features including scratches and micropores on particle surfaces confirmed long-term environmental exposure before collection.
Distribution Patterns of Microplastics Pollution in Urban Fresh Waters: A Case Study of Rivers in Chengdu, China
Researchers surveyed microplastic pollution in urban rivers of Chengdu, China, finding concentrations of 5 to 10.5 items per liter, predominantly transparent fragments and fibers, with spatial distribution influenced by urbanization and wastewater discharge.
Microplastic Pollution in China’s Aquatic Systems: Spatial Distribution, Transport Pathways, and Controlling Strategies
This review synthesizes recent findings on microplastic pollution across China's rivers, lakes, reservoirs, and coastal waters. Researchers found that contamination levels vary dramatically by location, with urban waterways showing the highest concentrations and polypropylene and polyethylene being the most common polymer types. The study identifies rivers as major transport pathways carrying microplastics from inland areas to the sea and evaluates strategies for reducing this pollution.
Temporal and spatial variation of microplastics in the urban rivers of Harbin
Researchers surveyed microplastic contamination in two urban rivers in Harbin, China, across both dry and wet seasons. The study found that polypropylene and polyethylene were the dominant polymers in surface water, while PVC and PET were most common in sediment, with domestic wastewater and rainfall runoff as the main sources. Evidence indicates that riparian vegetation along the riverbanks helped reduce microplastic migration through natural filtration processes.
Occurrence and distribution of microplastics in an urban river: A case study in the Pearl River along Guangzhou City, China
Microplastics were measured in surface water and sediments at 14 sites along the urban Pearl River in Guangzhou, finding 379–7,924 items/m³ in water and 80–9,597 items/kg in sediment with polyethylene and polypropylene as dominant types, and a significant relationship between population density and microplastic abundance. The study documents extremely high microplastic contamination in an urban Chinese river and quantifies the influence of urbanization on microplastic loading.
The effects of riverside cities on microplastics in river water: A case study on the Southern Jiangsu Canal, China
Researchers studied microplastic contamination in the Southern Jiangsu Canal in China and found that riverside cities significantly increase microplastic levels in river water, with abundance rising by 26% to 211% after flowing through urban areas. The study found that microplastic concentrations correlated with regional GDP and population density, with PET, polycarbonate, and polyethylene being the most common polymer types detected.
Microplastic Pollution in Typical Subtropical Rivers in Eastern China: A Case Study of the Feiyun River Basin
Researchers systematically studied microplastic pollution in the Feiyun River Basin in eastern China using field sampling and spectroscopic analysis. They found microplastic concentrations ranging from 3.7 to 36.4 items per liter, predominantly small particles and fragments, with polyethylene and polypropylene as the most common polymer types, indicating significant freshwater contamination in this subtropical river system.
Microplastics pollution in inland freshwaters of China: A case study in urban surface waters of Wuhan, China
Researchers characterized microplastic pollution in inland freshwaters across urban suburban areas of China, finding contamination that reflected land use intensity and population density in the surrounding catchments.
Research Progress of Microplastic Pollution Status and Risk Assessment of Typical Rivers in China
Rivers across China carry substantial microplastic loads, and this review finds that abundance is closely tied to population density, with urban rivers showing higher concentrations than rural ones. More than 60% of microplastics detected in most rivers were smaller than 1 mm — the size range most readily ingested by aquatic organisms and most difficult to remove by conventional treatment. The authors identify sewage plants, surface runoff, and atmospheric deposition as the main sources, and flag gaps in current risk assessment frameworks for river microplastics.
[Microplastic Pollution Status and Ecological Risk Evaluation in Weihe River].
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.