OCCURRENCE OF POLYBROMINATED DIPHENYLETHERS, POLYCHLORINATED DIBENZO-P-DIOXINS, DIBENZOFURANS AND BIPHENYLS IN COASTAL SEDIMENTS (NW ADRIATIC SEA, ITALY) INTRODUCTION AND OBJECTIVES Polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and biphenyls (PCBs) are ubiquitous and persistent contaminants in the marine environment , . PCDDs and PCDFs (PCDD/Fs) and PCBs are released from various sources, such as incinerators, chemical industries, and municipal wastewater effluents. The contamination in the marine environment also includes a variety of brominated flame retardants . This group of emerging pollutants includes polybrominated diphenyl ethers (PBDEs), which are used in a variety of commercial applications (plastics, textiles, electronic circuitry and other materials) to prevent fires. Due to their hydrophobic properties, these compounds tend to strongly partition to particulate matter in the marine environment and settle through the water column to the sediments, which act as their final sink. In this study, sediment samples were analyzed to determine levels and spatial trends of contaminants associated with historical industrial activities in the area (PCDDs/PCDFs, dl-PCBs), compared to more modern industrial chemicals (PBDEs). Samples were collected from Pialassa Baiona, an eutrophic coastal lagoon located along the northern Adriatic coast of Italy. Although the area is a wetland of international importance (RAMSAR Convention, EU Wild Birds Directive, EU Habitats and Species Directive), significant agricultural, urban and industrial activities have released toxic chemical pollutants into the lagoon. EXPERIMENTAL Four sampling areas were selected combining the distance from industrial inputs (near and far) and the distance from the sea (near and far) (Figure 1). Two areas were located near to the anthropogenic disturbance (i.e. industrial area), along the southern edge of the lagoon (areas 1 and 2), and two areas were located
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- Fall '20
- Polychlorinated biphenyl, D. Fabbri