NDLI: Concentrations of DDTs and dieldrin in Long Island Sound sediment

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Xiqing Yang, Lijia Wu, Youxian Jans, Urs Zhang, Pengfei Melcer, Michael E.
Copyright Year	2012
Abstract	The concentrations of three frequently detected organochlorine pesticides (OCPs) and one degradation product, p,p′-DDT, p,p′-DDD, dieldrin, and p,p′-DDE were determined in recently collected (2005–2006) and archived (1986–1989) surficial sediments and sediment cores from Long Island Sound (LIS). The concentration of dieldrin ranged from 0.05 to 5.27 ng g−1 dry weight in the surficial sediments, and from 0.05 to 11.7 ng g−1 dry weight in the sediment cores. Total DDXs (the sum of p,p′-DDE, p,p′-DDD and p,p′-DDT) concentrations ranged from 1.31 to 33.2 ng g−1 in surficial sediments and 1.11 to 66.4 ng g−1 in sediment cores. The results indicate that the three OCPs and DDE were still widely present in LIS surficial sediments two decades after the use of these pesticides in the United States was banned. In addition, the surficial concentrations did not decrease significantly when compared to the concentrations in archived samples collected two decades ago. Sediments in the western part of LIS were more contaminated (with concentrations in some western sites being still above probable effect levels) than those in the eastern part, probably as a result of the net westward sediment transport in LIS. The three OCPs and DDE were detected at all depths (down to ∼50 cm) in the sediment cores, and concentration profiles indicated a depositional sedimentary environment with significant sediment mixing. Such mixing may redistribute OCPs deposited earlier (deeper in sediment bed) to the sediment surface and lead to enhanced persistence of OCP concentrations in surficial sediments.
Starting Page	878
Ending Page	885
Page Count	8
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	14
Issue Number	3
Journal	Journal of Environmental Monitoring
DOI	10.1039/c2em10642f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DDD OCP Long Island Sound United States Organochloride DDT Dieldrin Sediment Sediment transport
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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