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Field evidence and modeling validation of biogeochemical controls on the deposition of persistent organic pollutants in the deep ocean

Journal of Hazardous Materials 2024 7 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Mengyang Liu, Mengyang Liu, Minggang Cai, Fajin Chen, Kmy Leung Mengyang Liu, Minggang Cai, Haowen Zheng, Mengyang Liu, Mengyang Liu, Mengyang Liu, Mengyang Liu, Mengyang Liu, Mengyang Liu, Mengyang Liu, Weimin Wang, Mengyang Liu, Kmy Leung Minggang Cai, Minggang Cai, Mengyang Liu, Jiandong Ye, Weimin Wang, Hongliang Li, Mengyang Liu, Mengyang Liu, Minggang Cai, Meng Yan, Meng Yan, Mengyang Liu, Mengyang Liu, Haowen Zheng, Minggang Cai, Kmy Leung Kmy Leung Fajin Chen, Fajin Chen, Kmy Leung Minggang Cai, Linghao Lou, Fajin Chen, Mengyang Liu, Fajin Chen, Mengyang Liu, Linghao Lou, Mengyang Liu, Minggang Cai, Kmy Leung Haowen Zheng, Haowen Zheng, Minggang Cai, Fajin Chen, Kmy Leung Minggang Cai, Kmy Leung Minggang Cai, Kmy Leung Minggang Cai, Minggang Cai, Minggang Cai, Fajin Chen, Weimin Wang, Fajin Chen, Kmy Leung Minggang Cai, Minggang Cai, Kmy Leung Haifeng Zhang, Kmy Leung Kmy Leung Mengyang Liu, Haowen Zheng, Kmy Leung Chunqing Chen, Fajin Chen, Minggang Cai, Minggang Cai, Mengyang Liu, Minggang Cai, Kmy Leung Minggang Cai, Chunqing Chen, Chunqing Chen, Chunqing Chen, Kmy Leung Minggang Cai, Mengyang Liu, Kmy Leung Minggang Cai, Jiandong Ye, Haowen Zheng, Linghao Lou, Linghao Lou, Minggang Cai, Kmy Leung Minggang Cai, Minggang Cai, Mengyang Liu, Minggang Cai, Minggang Cai, Minggang Cai, Minggang Cai, Minggang Cai, Meng Yan, Haowen Zheng, Kmy Leung Minggang Cai, Kmy Leung Linghao Lou, Linghao Lou, Minggang Cai, Minggang Cai, Minggang Cai, Minggang Cai, Minggang Cai, Minggang Cai, Kmy Leung Kmy Leung Kmy Leung

Summary

Surface sediments from the deep Eastern Indian Ocean (2161–4545 m) contained organochlorine pesticides (36.7–762.0 pg/g) and PCBs (25.5–110.0 pg/g) delivered primarily by long-range atmospheric transport, with mid-ocean ridge hydrodynamics influencing local deposition and accumulation patterns.

Study Type Environmental

Deposition in the deep ocean plays a crucial role in the global sink of persistent organic pollutants (POPs), yet observation-based assessments of their biogeochemical cycling are scarce. In this study, surface sediments were collected from deep sea of the Eastern Indian Ocean (2161-4545 m) and analyzed for organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs). Long-range atmospheric transport was identified as the dominant pathway for OCPs (36.7-762.0 pg/g) and PCBs (25.5-110.0 pg/g) to reach the basin area from surrounding agricultural, manufacturing, and combustion emissions. Besides the TOC-dependent deposition, unique hydrodynamic conditions in the mid-ocean ridge might influence the transport and accumulation of POPs by altering their resuspension and repartitioning processes. Results of the machine learning analysis suggested that logK, TOC content, and pollutant residence time in the ocean are important parameters in determining PCB concentrations in the Indian Ocean. Additionally, concentrations of POPs generally exhibited logarithmic relationships with microplastic abundances, indicating that microplastics act as potential carriers for transporting these pollutants to deep-sea sediments. This study revealed the biogeochemical controls on the deposition of OCPs and PCBs in the Indian Ocean by combining field observation and model simulation. Given the rapid rate of surface warming and various biogeochemical responses in the Indian Ocean, it is recommended to conduct long-term, high-resolution field observations to understand the dynamic fate of POPs in these changing ocean environments.

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