期刊
CHEMOSPHERE
卷 83, 期 10, 页码 1345-1352出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2011.02.081
关键词
PCDD/Fs; Dioxin-like PCBs; Congeners profile; Mondego estuary
资金
- FCT (Portuguese Foundation for Science and Technology) [SFRH/BD/46969/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/46969/2008] Funding Source: FCT
The concentrations of 17 polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs), and 12 dioxin-like polychlorinated biphenyls (dl-PCBs) were measured in sediment and key species as an initial investigation on PCDD/Fs and dl-PCBs contamination in the Mondego estuary (Portugal). The results demonstrated that the values of the total PCDD/Fs (Sigma PCDD/Fs) concentrations were considerably lower than those of the sum of dl-PCBs (Sigma dl-PCBs) in all the studied samples. Regarding the contribution of individual congeners. OCDD was the predominant PCDD/F and the mono-ortho PCB 118 and PCB 105 were the dominant PCBs in the majority of the samples. Our results suggest that PCDD/Fs and PCBs behave quite differently along the aquatic food web: Sigma PCDD/Fs concentrations were lower in higher trophic-level organisms with fish presenting a distinct PCDD/Fs congeners profile; on the contrary, the higher Sigma dl-PCBs values were found in upper-level biota, although not exclusively, and quite similar dl-PCBs congener profiles were observed in nearly all the studied species. (C) 2011 Elsevier Ltd. All rights reserved.
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