Occurrence of PCDD/Fs and dioxin-like PCBs in superficial sediment of Portuguese estuaries |
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Authors: | Margarida Nunes Anaïs Vernisseau Philippe Marchand Bruno Le Bizec Fernando Ramos Miguel A Pardal |
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Institution: | 1. CFE–Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Apartado 3046, 3001-401, Coimbra, Portugal 2. CEF–Center for Pharmaceutical Studies, Health Sciences Campus, Bromatology Lab, Pharmacy Faculty, University of Coimbra, Azinhaga de Santa Comba, 3000-548, Coimbra, Portugal 3. LUNAM Université, Oniris, Laboratoire d’étude des Résidus et Contaminants dans les Aliments (LABERCA), F-44307, Nantes, France
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Abstract: | Superficial sediments collected from seven estuarine systems located along the Portuguese coast were analyzed for 7 polychlorinated dibenzo-p-dioxins (PCDDs), 10 polychlorinated dibenzofurans (PCDFs), and 12 dioxin-like polychlorinated biphenyls (dl-PCBs). Total PCDD/F concentration ranged from 4.6 to 464 pg g?1 dry weight (dw), while that of dl-PCBs varied from 26.6 to 8,693 pg g?1 dw. In general, the highest PCDD/F and dl-PCB concentrations were associated with densely populated and industrially impacted areas. Additionally, PCDD/F revealed a predominance of octachlorodibenzodioxin (OCDD) to total PCDD/Fs, while PCB 118 was the major contributor to total dl-PCBs. This study provided a global perspective of the contamination status of Portuguese estuaries by dioxin-like compounds and allowed a comparison between the investigated systems and other systems worldwide. PCDD/F and dl-PCB levels found in the collected sediments were lower than those of highly impacted areas from different parts of the globe. Nevertheless, comparison with guidelines and quality standards from other countries indicated that some Portuguese estuarine areas with a high industrialization level present PCDD/F and dl-PCB concentrations in superficial sediment that may constitute a risk to aquatic organisms. |
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