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61,005 resultsShowing papers similar to Occurrence, impact factors, and pollution risk assessment of microplastics in a typical semi-arid urban river in northwest China
ClearOccurrence and distribution of microplastics in surface sediments of a typical river with a highly eroded catchment, a case of the Yan River, a tributary of the Yellow River
Microplastic contamination was characterized in riverbed sediments of rivers on the Loess Plateau in northwest China, an area subject to heavy erosion, finding widespread contamination dominated by polyethylene and polypropylene fragments. The study fills a gap in knowledge on microplastic pollution in inland arid and semi-arid river systems.
Contributions from typical sources to microplastics in surface water of a semiarid urban river
Researchers quantified the contributions of typical sources to microplastic pollution in the Yellow River's Lanzhou section. The study found that wastewater treatment plant effluent and urban tributaries were the dominant sources, with fibers and fragments composed mainly of polyethylene terephthalate and polyamide, highlighting the role of urban areas in river microplastic contamination.
Distribution of microplastics in Lanzhou section of the Yellow River: Characteristics, ecological risk assessment, and factors analysis
Researchers surveyed microplastic contamination in surface water and sediments along the Lanzhou section of China's Yellow River. They found that most particles were small fibrous fragments of PET and polypropylene, with higher abundances during the dry season, and that human activity and weather patterns influenced microplastic distribution. Ecological risk assessments indicated the overall pollution level in this stretch of the river was relatively low.
Seasonal influence on pollution index and risk of multiple compositions of microplastics in an urban river
A seasonal study of microplastics in an urban river in China found higher abundance in the dry season (183 items per square meter) compared to the wet season (102 items per square meter). Risk assessment indicated that fibers and small fragments posed the greatest ecological risk, with polymer-specific hazard quotients varying by season.
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.
Microplastics in surface waters and sediments of the Wei River, in the northwest of China
Microplastics were measured in surface water and sediments across the Wei River basin in northwest China, finding water concentrations of 3.67–10.7 items/L and sediment concentrations of 360–1,320 items/kg, with fibers (50.1%) and small particles (<0.5 mm) dominant. The study documents widespread microplastic contamination in the largest tributary of the Yellow River, driven by urbanization and agricultural runoff.
[Distribution, Risk, and Influencing Factors of Microplastics in Surface Water of Huangshui River Basin].
Researchers collected 63 surface water samples across the Huangshui River Basin on the Qinghai-Tibet Plateau during the wet season, using metallographic microscopy and Fourier infrared spectroscopy to characterize microplastic distribution, and applied risk index and pollution load index models to evaluate ecological risks.
Spatial–Temporal Distribution and Ecological Risk Assessment of Microplastics in the Shiwuli River
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.
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.
Distribution, Sources, and Ecological Risk Assessment of Microplastics in the Lower Minjiang River
Researchers characterized microplastic abundance, morphology, and polymer composition in surface water and sediments from the lower Minjiang River in China, then used pollution load indices and ecological risk assessments alongside socioeconomic data to identify likely pollution sources and ecological impacts.
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.
Microplastic pollution characteristics and ecological risk assessment in the Wuding River Basin, China
Researchers surveyed microplastic pollution in the Wuding River, a tributary of China's Yellow River, collecting samples from 19 sites across water and sediment. They found that microplastic abundance varied significantly across locations, with fibers being the dominant shape, and identified population density and land use as key factors influencing contamination levels. The ecological risk assessment indicated that certain areas of the basin face moderate to high risk from microplastic pollution.
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 in Chinese Rivers: A detailed analysis of distribution, risk factors, and ecological impact
Researchers aggregated data from 2,474 microplastic samples across 165 publications to assess ecological risk in Chinese rivers, finding widespread contamination with average abundance varying substantially by watershed characteristics. A revised risk assessment accounting for particle morphology and polymer toxicity raised concern levels beyond previous estimates.
[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.
Notable ecological risks of microplastics to Minjiang River ecosystem over headwater to upstream in Eastern Qinghai-Tibetan Plateau
Scientists measured microplastic pollution along 291 kilometers of the Minjiang River on the Qinghai-Tibetan Plateau and found levels increased near more populated areas. The most common types were polyethylene and polypropylene fragments smaller than 500 micrometers. Risk assessments showed medium to very high pollution levels in the river water, raising concerns about contamination even in remote highland regions.
Pollution characteristics and prospective risk of microplastics in the Zhengzhou section of Yellow River, China
Researchers analyzed microplastic pollution across fourteen sampling sites in the Zhengzhou section of the Yellow River in China. The study found microplastic concentrations ranging from 2.33 to 15.50 particles per liter, higher than other inland Chinese rivers, with fibers and fragments being the dominant types and polyethylene the most common polymer.
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.
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.
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.
Characteristics, Contamination Levels, and Ecosystem Risk Assessment of Microplastics in Surface Water of a Highly Urbanized River from a Developing Country
Researchers characterized microplastic contamination in an urban river near a megacity in a developing country, finding concentrations of 350 to 660 particles per cubic meter of water. Polyethylene and polypropylene from household and municipal waste were the most common types, and a risk assessment found concerning contamination levels at several sampling sites. The study highlights how rivers in developing nations can serve as major pathways for microplastics to reach the ocean and enter the food chain.
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.
Microplastic pollution in urban rivers within China's Danxia landforms: Spatial distribution characteristics, migration, and risk assessment
Researchers surveyed microplastic contamination in surface water, sediment, and groundwater across six cities in China's ecologically fragile Danxia landform region. They found moderate levels of contamination, with urban wastewater and agricultural runoff identified as the primary sources. The study suggests that these unique and ecologically sensitive landscapes face real microplastic pollution risks tied to nearby human activity.
Spatial variability of microplastic pollution on surface of rivers in a mountain-plain transitional area: A case study in the Chin Ling-Wei River Plain, China
Researchers measured microplastic pollution in surface waters from mountain tributaries to the main stream in the Chin Ling-Wei River Plain in China. They found concentrations ranging from 2.3 to 21 items per liter, with higher levels in the main stream compared to tributaries, and 82% of particles being fragments and films. The study suggests that as rivers flow from mountains to more developed plains, microplastic pollution risk increases sharply due to more diverse land use and human activity.