Historical record and fluxes of DDTs at the Palos Verdes Shelf Superfund site, California
文献类型：期刊论文
| 作者 | Schlenk, Daniel; Liao, Chunyang; Taylor, Allison R.; Kenney, William F.; Gan, Jay |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2017-10-15 |
| 卷号 | 581期号:0页码:697-704 |
| 关键词 | Palos Verdes Shelf Sediment Cores Ddts Historical Trends Mass Fluxes |
| 英文摘要 | Marine sediments at many locations in the world are contaminated with a wide range of persistent organic pollutants. The Palos Verdes Shelf (PVS) is located in the ocean off the coast of Los Angeles, California and has been listed as a Superfund site by the US EPA since 1997, because of heavy contamination Of DDTs and PCBs. However, little is known about the historical trend in the deposition of DDTs as a result of decades-long discharge of wastewater effluents. In this study, sediment cores were taken from the PVS site and deteralined for DDT and its metabolites including DDE and DDD (denoted as DDTs). Individual DDTs were found in the majority (95%) of the samples analyzed. The highest Sigma DDT concentrations were found in three cores along the 60-meter isobath With geometric means of 31300, 7490, and 5010 ng/g dw and medians of 82400, 17300, and 5200 ng/g dw, respectively. Among DDT congeners, p,p'-DDE, o,p'-DDE and p,p'-DDD were predominant, contributing to approximately 54%, 27%, and 14% of the Sigma DDTs in sediment. The vertical profiles of concentrations of contaminants in the sediment cores were examined. For most of the cores, a steady increase in the concentrations of DOTs during 1940s to 1980s was observed, while the concentrations declined gradually toward the surficial layers. On the basis of the mass flux of DDTs calculated and the area of the PVS Superfund site, We estimated the total deposition amount of DDTs in sediment and the deposition amount of Sigma DDTs in this region during 1947-1971 was 132 tons, which was fairly dose to what was reported in earlier studies for industrial wastewater discharge in the PVS site (870-1450 tons). Our findings suggest that the elevated levels of DDTs in sediment from the PVS site are linked to the discharge of these contaminants between the 1940s-1980s. (C) 2016 Elsevier B.V. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/39330]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Schlenk, Daniel,Liao, Chunyang,Taylor, Allison R.,et al. Historical record and fluxes of DDTs at the Palos Verdes Shelf Superfund site, California[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,581(0):697-704. |
| APA | Schlenk, Daniel,Liao, Chunyang,Taylor, Allison R.,Kenney, William F.,&Gan, Jay.(2017).Historical record and fluxes of DDTs at the Palos Verdes Shelf Superfund site, California.SCIENCE OF THE TOTAL ENVIRONMENT,581(0),697-704. |
| MLA | Schlenk, Daniel,et al."Historical record and fluxes of DDTs at the Palos Verdes Shelf Superfund site, California".SCIENCE OF THE TOTAL ENVIRONMENT 581.0(2017):697-704. |
入库方式： OAI收割
来源：生态环境研究中心
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