文献类型：期刊文献

英文题名：Distribution and sources of DDT and its metabolites in porewater and sediment from a typical tropical bay in the South China Sea

作者：Peng, Shiyun[1,2,3,4];Kong, Deming[4];Li, Liting[4];Zou, Chunlin[1,2,3];Chen, Fajin[4];Li, Meiju[1,2,3];Cao, Tao[1,2,3];Yu, Chiling[1,2];Song, Jianzhong[1,2];Jia, Wanglu[1,2];Peng, Ping'an[1,2,3]

机构：[1]Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China;[2]Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Environm Protect & Resourc, Guangzhou 510640, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China

年份：2020

卷号：267

外文期刊名：ENVIRONMENTAL POLLUTION

收录：SCI-EXPANDED(收录号：WOS:000631909700040)、、EI(收录号：20203809185147)、Scopus(收录号：2-s2.0-85090722484)、WOS

基金：This study was financially supported by the National Natural Science Foundation of China (41673117, 41606070) and the Marine Science Research Team Project of Guangdong Ocean University (002026002004). We thank Yafei Meng, Guosheng Chen, and Weijia Feng for their field sampling assistance. We greatly appreciate the assistance of editor and two anonymous reviewers for the helpful comments that greatly improved the quality of this manuscript. This is contribution No. IS-2901 from GIGCAS.

语种：英文

外文关键词：DDT and Its metabolites; Porewater; Degradation; Dissolved organic carbon

外文摘要：Dichlorodiphenyltrichloroethane (DDT) is well known for its harmful effects and has been banned around the world. However, DDT is still frequently detected in natural environments, particularly in aquaculture and harbor sediments. In this study, 15 surface sediment samples were collected from a typical tropical bay (Zhanjiang Bay) in the South China Sea, and the levels of DDT and its metabolites in sediment and porewater samples were investigated. The results showed that concentrations of DDXs (i.e., DDT and its metabolites) in bulk sediments were 1.58-51.0 ng g(-1) (mean, 11.5 ng g(-1)). DDTs (DDT and its primary metabolites, dichlorodiphenyldichloroethane (DDD) and dichlorodiphenyldichloroethylene (DDE)) were the most prominent, accounting for 73.2%-98.3% (86.1% +/- 12.8%) of the DDXs. Additionally, high-order metabolites (i.e., 1-chloro-2,2-bis(4'-chlorophenyl)ethylene (p,p'-DDMU), 2,2-bis(p-chlorophenyl)ethylene (p,p'-DDNU), 2,2-bis(p-chlorophenyl)ethanol (p,p'-DDOH), 2,2-bis(p-chlorophenyl) methane (p,p'-DDM), and 4,4'-dichlorobenzophenone (p,p'-DBP)) were also detected in most of the sediment and porewater samples, with DDMU and DBP being predominant. The DDTs concentration differed among the sampling sites, with relatively high DDTs concentrations in the samples from the aquaculture zone and an area near the shipping channel and the Haibin shipyard. The DDD/DDE ratios indicated a reductive dichlorination of DDT to DDD under anaerobic conditions at most of the sampling sites of Zhanjiang Bay. The possible DDT degradation pathway in the surface sediments of Zhanjiang Bay was p,p'-DDT/p,p'-DDD(p,p'-DDE)/p,p'-DDMU/p,p'-DDNU/. /p,p'-DBP. The DDXs in the sediments of Zhanjiang Bay were mainly introduced via mixed sources of industrial DDT and dicofol, including fresh input and historical residue. The concentrations of DDXs in porewater samples varied from 66.3 to 250 ng L--1,L- exhibiting a distribution similar to that in the accompanying sediments. However, the content of high-order metabolites was relatively lower in porewater than in sediment, indicating that high-order degradation mainly occurs in particles. Overall, this study helps in understanding the distribution, source, and degradation of DDT in a typical tropical bay. (c) 2020 Elsevier Ltd. All rights reserved.