Centro Interdipartimentale di Ricerca per le Scienze Ambientali (C.I.R.S.A.), University of Bologna, Campus di Ravenna, Ravenna 48123, Italy.
National Research Council of Italy, Institute of Marine Sciences (CNR-ISMAR), Via Gobetti 101, 40129 Bologna, Italy.
Sci Total Environ. 2016 Aug 15;562:580-587. doi: 10.1016/j.scitotenv.2016.04.086. Epub 2016 Apr 22.
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.
本研究调查了采集自亚得里亚海西部南北轴向五个横截面上的沉积物中多氯联苯（PCBs）的来源、历史趋势和存量。在沉积物岩芯中，总多氯联苯（∑28 PCBs）的浓度范围为<检测限（limit of detection）至 9.0ngg(-1)，在最近的沉积物中则为 0.1 至 2.2ngg(-1)。PCB 浓度的时间记录显示出与历史 PCB 生产和使用的共同模式，最大峰值出现在 20 世纪 60 年代至 80 年代之间。与峰值水平相比，过去二十年沉积的沉积物中的 PCB 减少了约 40%至 80%，反映了自 20 世纪 70 年代末以来对 PCB 生产和使用的禁令。PCB 水平以及高氯化同系物的存在向南减少，表明波河是亚得里亚海西部 PCBs 的主要来源。这进一步得到了 PCB 存量的估计，在波河三角洲前缘（256ngcm(-2))的存量比中、南部亚得里亚海分别高出约 4-7 倍，比深亚得里亚海高出约 100 倍。
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