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With spatial distribution, risk evaluation of heavy metals and microplastics to emphasize the composite mechanism in hyporheic sediments of Beiluo River
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Researchers mapped heavy metal and microplastic contamination in river sediments in China, finding that cadmium, lead, and arsenic posed the highest contamination risk, while fiber-shaped microplastics under 500 micrometers were most common. Heavy metals were found concentrated on microplastic surfaces through electrostatic attraction and bacterial biofilms, meaning the plastics serve as carriers for toxic metals in the water. This combined pollution is concerning because river sediments can release contaminants into water used for drinking and agriculture.
This study aimed to assess the hazardous impacts of heavy metals (HMs) enrichment on the surface of microplastics (MPs) in the hyporheic zone. The present work analyzed the spatial distribution and risk evaluation of HMs (V, Cr, Mn, Co, Ni, Cu, Zn, As, Cd, and Pb) and MPs and the mechanism of HMs enrichment on MPs in the sediments. The highest rates of contamination were for Cd, Pb, and As. The main types of MPs were fiber, blue, and a size smaller than 500 µm. The lower reaches of the Beiluo River had the most serious HMs and MPs pollution, especially BL-10 (HMs: CF-Cd, 41.91; EF-Cd, 50.87; Igeo-Cd, 4.80; RI, 1291; P, 29.83; MPs: abundance, 890 ± 18 items/kg). Meanwhile, the principal component analysis showed that natural, industrial activities, and agricultural production and transportation were primary HMs sources in sediments, and Cd, Co, and Pb were the main enriched metals on the surface of MPs. More importantly, regarding the interaction mechanism of these composite pollutants, we concluded that electrostatic adsorption and biofilm mediation were the main mechanisms of the synergistic effect. Overall, our findings provide a theoretical basis for further research on the ecotoxicity of composite pollutants in aquatic environments.
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Interaction and bacterial effects of microplastics pollution on heavy metals in hyporheic sediments of different land-use types in the Beiluo River Basin
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Researchers studied how microplastics and heavy metals interact in river sediments across different land-use types in a Chinese river basin. They found that microplastics concentrated more heavily in shallow sediments and that the metals detected on microplastic surfaces were present at much higher levels than in surrounding sediment. The study suggests that microplastics may serve as concentrators and carriers of heavy metal contamination, potentially amplifying pollution risks.
The competition of heavy metals between hyporheic sediments and microplastics of driving factors in the Beiluo River Basin
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Researchers studied the competitive enrichment of heavy metals between river sediments and microplastics in the Beiluo River Basin. They found that while sediments generally had higher heavy metal concentrations overall, microplastics selectively accumulated certain metals at higher rates depending on environmental conditions. The study highlights that microplastics in river systems can act as carriers that redistribute heavy metal contamination in complex ways.
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Researchers investigated microplastic contamination in river sediments of an urban canal in Zhenjiang City, China, finding an average abundance of over 2,000 particles per kilogram across seasons. The study found that microplastics acted as carriers for heavy metals like cadmium, copper, and lead, with factors such as polymer type, particle size, and surface weathering influencing adsorption capacity. Evidence indicates that smaller, more weathered microplastics in sediments may concentrate higher levels of toxic metals.
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Spatial distributions of macronutrients, heavy metals and microplastics in surface sediments of the mainstem and lakes in the middle part of the Yellow River Basin
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Researchers mapped the distribution of macronutrients, heavy metals, and microplastics in sediments along the middle section of the Yellow River and adjacent lakes in China. They found that microplastic concentrations ranged from 233 to 3,333 items per kilogram in river sediments, with nylon as the dominant polymer type. Contamination levels increased significantly after the river flowed through intensive agricultural areas, with urban lakes showing the highest heavy metal concentrations.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.