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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

Journal of Hazardous Materials 2023 55 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 60 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Bingjie Li, Bingjie Li, Bingjie Li, Mingchang Guan, Mingchang Guan, Yuting Zhang Bingjie Li, Zeyu Chen, Yuting Zhang Ruichen Mao, Mingchang Guan, Bingjie Li, Jinxi Song, Bingjie Li, Jinxi Song, Zeyu Chen, Yuting Zhang Jinxi Song, Mingchang Guan, Ruichen Mao, Jinxi Song, Mingchang Guan, Yuting Zhang Jinxi Song, Mingchang Guan, Mingchang Guan, Mingchang Guan, Yuting Zhang Yuting Zhang Yuting Zhang Zeyu Chen, Zeyu Chen, Mingchang Guan, Bingjie Li, Jinxi Song, Zeyu Chen, Jinxi Song, Ruichen Mao, Bin Tang, Jiawei Zhao, Mingchang Guan, Yuting Zhang Ruichen Mao, Jinxi Song, Bin Tang, Jinxi Song, Bin Tang, Jinxi Song, Yongqing Long, Jiawei Zhao, Ruichen Mao, Yongqing Long, Ruichen Mao, Yongqing Long, Yongqing Long, Jinxi Song, Ruichen Mao, Ruichen Mao, Bin Tang, Ruichen Mao, Ruichen Mao, Bin Tang, Bin Tang, Mingchang Guan, Jiawei Zhao, Mingchang Guan, Jiawei Zhao, Jiawei Zhao, Jiawei Zhao, Mingchang Guan, Wenjin Xu, Wenjin Xu, Mingchang Guan, Wenjin Xu, Wenjin Xu, Yuting Zhang

Summary

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.

Study Type Environmental

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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