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Distribution and characteristics of microplastics in sediment at representative dredged material ocean dumping sites, China

Marine Pollution Bulletin 2023 9 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 40 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Yuying Yi, Yuying Yi, Yuying Yi, Yuxia Li, Yuying Yi, Yuxia Li, Lingna Kong, Lingna Kong, Yuxia Li, Lingna Kong, Lingna Kong, Lingna Kong, Yuxia Li, Xiaomeng Wang, Xiaomeng Wang, Hong Chen Yuxia Li, Yuxia Li, Lingna Kong, Jiayi Cheng, Jiayi Cheng, Jiayi Cheng, Jiayi Cheng, Lingna Kong, Jianbo Han, Jiayi Cheng, Xiaomeng Wang, Jianbo Han, Jiayi Cheng, Hong Chen Jianbo Han, Jiayi Cheng, Naidong Zhang, Naidong Zhang, Jiayi Cheng, Jianbo Han, Jianbo Han, Jianbo Han, Naidong Zhang, Xiaomeng Wang, Xiaomeng Wang, Hong Chen

Summary

This study investigated microplastic contamination in sediments at eight ocean dumping sites used for dredged material in China, finding an average abundance of about 113 particles per kilogram of dry sediment. Dumping activities appeared to be the dominant source of microplastics at only the most offshore site, while nearshore sites were influenced more by other inputs. The results highlight ocean dumping as an underappreciated pathway for introducing microplastics into coastal marine sediments.

Polymers

PET

Study Type Environmental

Dredged material ocean dumping activities are likely an important source of microplastics (MPs) in coastal areas but have received little attention globally. In this study, we investigated the spatiotemporal distribution and characteristics of MPs in sediments at eight dredged material dumping sites of China. MPs were separated from sediment through density flotation, and polymer types were identified using μ-FTIR. The results showed that the average MP abundance was 112.82 ± 109.68 items/kg d.w. The MPs were more abundant at nearshore dumping sites than at distant dumping sites. Dumping activities may be the main contributor of MPs to Site BD1, the farthest dumping site from shore, but only a minor source of MPs at the other dumping sites. The characteristics of MPs were dominated by transparent PET fibers <1 mm. Overall, sediments at the dumping sites exhibited relatively low to moderate concentrations of MPs in comparison to most other coastal sediments.

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