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Issue 3, 2012
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Concentrations of DDTs and dieldrin in Long Island Sound sediment

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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.

Graphical abstract: Concentrations of DDTs and dieldrin in Long Island Sound sediment

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Publication details

The article was received on 04 Aug 2011, accepted on 15 Dec 2011 and first published on 26 Jan 2012

Article type: Paper
DOI: 10.1039/C2EM10642F
Citation: J. Environ. Monit., 2012,14, 878-885
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    Concentrations of DDTs and dieldrin in Long Island Sound sediment

    L. Yang, X. Li, P. Zhang, M. E. Melcer, Y. Wu and U. Jans, J. Environ. Monit., 2012, 14, 878
    DOI: 10.1039/C2EM10642F

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