title: The nutrient, total petroleum hydrocarbon and heavy metal contents in the seawater of Bohai Bay, China: Temporal-spatial variations, sources, pollution statuses, and ecological risks.
abstract: Seawater samples collected between 2007 and 2012 were determined the concentrations of nutrient (DIN and DIP), total petroleum hydrocarbon (TPH), and six different heavy metals (As, Cu, Zn, Pb, Cd and Hg). The DIN, DIP, TPH, Pb, and Cd concentrations decreased from 2007 to 2009 or 2010 and increased after 2010. However, the Hg and Cu concentrations increased from 2007 to 2012. In contrast, the As and Zn gradually decreased during the study period. All of the pollutant concentrations gradually decreased from the shoreline to the offshore sites. PCA result showed that urban and port areas, agriculture, and atmospheric deposition were the main sources of pollutants in the bay. Although most of the pollutants were present at concentrations bellow the highest seawater quality standards in China, eutrophication was a risk in Bohai Bay. In addition, DIN was the main pollutant and was responsible for the eutrophication risk in Bohai Bay.
authors.affiliation: Laboratory of Environmental Protection in Water Transport Engineering, Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China. Electronic address: pengshitaotj@126.com.
authors.forename: Shitao
authors.initials: S
authors.lastname: Peng
mesh_terms: D061006:Bays / Q000737:chemistry*; D002681:China; D004463:Ecology; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D006838:Hydrocarbons / Q000032:analysis; D008628:Mercury / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D010578:Petroleum / Q000032:analysis*; D012306:Risk; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D006838:Hydrocarbons; D019216:Metals, Heavy; D010578:Petroleum; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Bohai Bay; Ecological risk; Heavy metals; Nutrients; Pollution status; Total petroleum hydrocarbons