|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5751430||1619712||2017||13 صفحه PDF||سفارش دهید||دانلود رایگان|
- Trace metals evolution in the sediment record of polluted areas from industrial times.
- Identify effects of environmental management on the Barcelona City Continental Shelf.
- Trace metal decrease of up to an order of magnitude after taking corrective measures.
- Extremely high mercury levels drastically reduced by environmental regulations.
- Still high pollution because of the difficulty of pollutant management during floods.
The evolution of trace metal pollution on the Barcelona city continental shelf during the last few decades was studied by analyzing the historical records of trace metals in sediment cores and surface sediment samples taken at the same locations in 1987 and in 2008. Polluted surface samples taken in 1987 reached enrichment factors of up to 490 for Hg, about 40 for Pb and Cd, and about 17 for Zn, Cr and Cu. The data show a decline of up to one order of magnitude in the trace metal content of surface sediments during the last few decades, with maximum enrichment factors of between 20 and 30 for Hg and Cd and between 5 and 12 for Zn, Cr, Pb and Cu. Although present-day pollution is still significant, it is evident that environmental regulations that are in place, including the operation since 1979 of wastewater treatment plants built in the BesÃ²s River watershed, have drastically reduced the pollution levels in this highly populated and industrialized Mediterranean area. However, water discharge during heavy rain events exceeds the treatment capacity of the existing facilities, leading to the maintenance of still high levels of metals in sediments of the Barcelona city shelf.
Journal: Science of The Total Environment - Volume 579, 1 February 2017, Pages 755-767