Polychlorinated biphenyls (PCBs) in sediments from the western Adriatic Sea: Sources, historical trends and inventories.
Sources, historical trends and inventories of polychlorinated biphenyls (PCBs) were investigated in sediments collected in five transects along the north-south axis of the western Adriatic Sea. The concentration of total PCBs (∑28 PCBs) ranged from <LOD (limit of detection) to 9.0ngg(-1) in the sediment cores and between 0.1 and 2.2ngg(-1) in recent sediments. Chronological records of PCB concentrations displayed a common pattern with historical PCB production and use, with the maximum peak values detected between the 1960s and the 1980s. Sediments deposited within the last two decades presented a ~40% to ~80% PCB reduction in comparison to the peak levels, reflecting the ban on PCB production and use since the late 1970s. PCB levels along with the presence of high-chlorinated congeners decreased southwards, indicating the Po River as the major source of PCBs in the western Adriatic Sea. This is further corroborated by the estimated inventories of PCBs, which were ~4-7 times higher in the Po River prodelta (256ngcm(-2)) in comparison to the middle and southern Adriatic, respectively, and about 100 times higher than the in the deep Adriatic Sea.
Centro Interdipartimentale di Ricerca per le Scienze Ambientali (C.I.R.S.A.), University of Bologna, Campus di Ravenna, Ravenna 48123, Italy. Electronic address: tatiane.combi4@unibo.it.
Tatiane
T
Combi
National Research Council of Italy, Institute of Marine Sciences (CNR-ISMAR), Via Gobetti 101, 40129 Bologna, Italy.
Stefano
S
Miserocchi
National Research Council of Italy, Institute of Marine Sciences (CNR-ISMAR), Via Gobetti 101, 40129 Bologna, Italy.
Leonardo
L
Langone
Centro Interdipartimentale di Ricerca per le Scienze Ambientali (C.I.R.S.A.), University of Bologna, Campus di Ravenna, Ravenna 48123, Italy; Department of Physics and Astronomy, University of Bologna, Bologna, Italy.
Roberta
R
Guerra
D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007558:Italy; D009792:Oceans and Seas; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
Adriatic mud-wedge; Fluxes; Homologue patterns; Persistent organic pollutants; Sediment cores