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Distribution characteristics and risk assessment of microplastics in Lake Bosten
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Lake Bosten in northwestern China — a large, semi-closed lake in an arid region — was found to be significantly contaminated with microplastics, with concentrations varying by location and season in both surface water and sediments. Transparent fibers were the most common type, likely originating from agricultural plastics and textile sources prevalent in the region. The study also conducted a risk assessment suggesting that microplastic pollution in the lake poses an ecological concern for aquatic organisms living there.
Abstract As emerging global contaminants, microplastics (MPs)’ environmental fate and risks have expanded from marine to freshwater systems, yet semi-closed arid lakes remain understudied. This study systematically evaluates MPs pollution in Bosten Lake, revealing abundances of 1.33–9.43 n/L (surface water) and 151.55–953.31 n/kg (sediments) with pronounced spatiotemporal heterogeneity. Spatial hotspots correlated with functional zones: pastoral (B8), transportation (B2, B10), and tourism areas (B11, B12) were primary sources, driven by agricultural plastics, tire wear particles, and tourism debris. Temporally, dry season MPs in water increased by 32.4% due to prolonged hydraulic retention. White (54.09%) and black (30.07%) are the dominant components of MPs in Lake Bosten, with 0.1–0.5 mm, fibrous polypropylene MPs being the most common. Ecological Risk Index (RI) showed seasonal divergence: 92.3% of wet season sediment sites exhibited extreme risks (RI > 1000, e.g., inflow area B13), while dry season RI declined to moderate levels (e.g., B8 decreased from 1335.13 to 188.22) via reduced terrestrial inputs and degradation. This highlights dual “hydrological-anthropogenic” drivers, necessitating dynamic controls during tourism peaks, fishing, and traffic surges to mitigate MPs risks in arid closed-basin lakes.
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Distribution characteristics and risk assessment of microplastics in Lake Bosten
AI summary Read the abstract
Researchers systematically investigated the distribution, characteristics, and ecological risks of microplastics in Bosten Lake — China's largest inland freshwater lake — finding surface water abundances of 1.33-9.43 items/L and sediment concentrations of 152-953 items/kg dry weight dominated by white and black polypropylene fibers and fragments. Potential sources include residential activities, tourism, agriculture, and fisheries, with seasonal variation in risk and an overall high-risk designation using the potential ecological risk index.
Microplastics and their interaction with microorganisms in Bosten Lake sediment
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Researchers conducted the first study of microplastic contamination in the sediment of Bosten Lake in China, finding plastics throughout the lake with the highest levels near populated areas. The most common types were PET and polyethylene, primarily in fiber form. Certain bacteria associated with plastic breakdown were more abundant in heavily contaminated areas, but the presence of microplastics in this freshwater system raises concerns about their entry into the food chain.
Abundance and distribution of microplastics in water and sediment of Baiyangdian Lake, Northern China
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Researchers surveyed Baiyangdian Lake in northern China and found microplastics at concentrations of 1,000 to 20,000 particles per liter across water depths and sediments. Fibers were the dominant type, highlighting widespread contamination in a major freshwater lake system.
Microplastics in Sediment and Surface Water of West Dongting Lake and South Dongting Lake: Abundance, Source and Composition
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Microplastics were found in both surface water and sediments of West Dongting Lake and South Dongting Lake in China, with fibers and fragments as the dominant types and concentrations influenced by proximity to urban and agricultural land use. The study provides the first data on microplastic contamination in China's second-largest freshwater lake system.
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