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Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea
Dasgupta, Shamik1; Peng, Xiaotong1; Xu, Hengchao1; Ta, Kaiwen1; Chen, Shun1,2; Li, Jiwei1; Du, Mengran1
2021-04-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume765Pages:10
AbstractLarge plastic litter (as opposed to microplastics and plastic pellets) could adsorb organic pollutants and thus pose a serious threat to the marine environment. We report high levels of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) adsorbed to plastic litter sampled from depths of 1800-3100 m in the Xisha Trough region of the northern South China Sea (NSCS). Sigma PCBs on plastics ranged from 126.9-142.1 ng/g, with tri-PCBs accounting for 92-97% of the total PCB concentrations in all samples. Levels of Sigma OCPs varied from 4280 to 5351 ng/g (average 4690 ng/g), with a total of 19 compounds detected in the seven samples. While no parent DDT (dichlorodiphenyltrichloroethane) was detected, op'-DDE (metabolite of DDT) was most abundant, with concentrations ranging from 947.5-1551.7 ng/g. SCHLs (heptachlor + heptachlor epoxide A + heptachlor epoxide B + cis-chlordane + trans-chlordane) ranged from 1083.1-1263.7 ng/g (mean 1153 ng/g) and accounted for 24% of Sigma OCPs. Various compositional ratios of HCH (hexachlorocyclohexane) and DDT metabolites improved our understanding of the sources and transport pathways of OCPs. The total absence of DDT may be a "ghost indicator" of no recent DDT inputs into the oceans. There could well be inputs of DDT, but only as the degraded metabolites DDE and DDD when they are adsorbed to seafloor plastic litter. A comparison of HCH isomer ratios in seafloor plastics with technical HCH ratios revealed that HCHs were possibly not from early residues but from later inputs. An ecological risk assessment of the contaminants indicated a high risk from Sigma DDTs, p,p-DDE, and gamma-HCH in all the sampled locations. Finally, we propose a descriptive model depicting the movements and transportation of PCBs and OCPs from the ocean surface to seafloor plastics in the NSCS. (C) 2020 Elsevier B.V. All rights reserved.
KeywordPlastics Polychlorinated biphenyl (PCB) Organochlorine pesticide (OCP) South China Sea Marine pollution
DOI10.1016/j.scitotenv.2020.144228
Indexed BySCI
Funding OrganizationNational Key Research and Development Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFC0300503] ; National Key Research and Development Program of China[2016YFC0302301] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22020703]
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000616232300039
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/8512
Collection深海科学研究部_深海地质与地球化学研究室
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Corresponding AuthorPeng, Xiaotong
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Hainan, Peoples R China
2.Southern Marine Sci & Engn Lab Zhuhai, Zhuhai 519000, Peoples R China
Recommended Citation
GB/T 7714
Dasgupta, Shamik,Peng, Xiaotong,Xu, Hengchao,et al. Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,765:10.
APA Dasgupta, Shamik.,Peng, Xiaotong.,Xu, Hengchao.,Ta, Kaiwen.,Chen, Shun.,...&Du, Mengran.(2021).Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea.SCIENCE OF THE TOTAL ENVIRONMENT,765,10.
MLA Dasgupta, Shamik,et al."Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea".SCIENCE OF THE TOTAL ENVIRONMENT 765(2021):10.
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