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Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea

文献类型：期刊论文

作者Dasgupta, Shamik1; Peng, Xiaotong1; Xu, Hengchao1; Ta, Kaiwen1; Chen, Shun1,2; Li, Jiwei1; Du, Mengran1
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2021-04-15
卷号765页码:10
关键词Plastics Polychlorinated biphenyl (PCB) Organochlorine pesticide (OCP) South China Sea Marine pollution
ISSN号0048-9697
DOI10.1016/j.scitotenv.2020.144228
英文摘要Large 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.
资助项目National 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研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000616232300039
出版者ELSEVIER
资助机构National Key Research and Development Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.idsse.ac.cn/handle/183446/8511]  
专题专家咨询委员会
深海科学研究部_深海地质与地球化学研究室
通讯作者Peng, Xiaotong
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：深海科学与工程研究所

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