title: Comparison of historical record of PCDD/Fs, dioxin-like PCBs, and PCNs in sediment cores from Jiaozhou Bay and coastal Yellow Sea: implication of different sources.
abstract: The concentrations of polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs), dioxin-like polychlorinated biphenyls (PCBs), and polychlorinated naphthalenes (PCNs) were measured in two sediment cores collected from Jiaozhou Bay. The concentrations of PCDD/Fs, dioxin-like PCBs, and PCNs in the cores were in the range of 2.8-26.3, 7.1-82.4 and 3.9-56.4 pg/g dw, respectively. The depth profiles of total concentrations PCDD/Fs and dioxin-like PCBs were similar in the sediment core J37 inside Jiaozhou Bay, but different from those in the sediment core J94 outside the bay, suggesting the different sources. In both cores Tri-CNs and Tetra-CNs were dominant, similar to the PCNs composition of some Halowax technical products. The maximal PCNs contamination occurred in the mid-1970s (outside the Bay) and early-1990s (inside the Bay). An increase of the indicator CN congeners characteristic for thermal source in the top layers of the sediment core inside the bay indicated that the contribution from the municipal solid waste incineration has been more important in recent years.
authors.affiliation: National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Pan
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Yang
authors.forename: Sachi
authors.initials: S
authors.lastname: Taniyasu
authors.forename: Leo Wai Yin
authors.initials: LW
authors.lastname: Yeung
authors.forename: Jerzy
authors.initials: J
authors.lastname: Falandysz
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Yamashita
mesh_terms: D001572:Benzofurans / Q000032:analysis*; D002681:China; D004147:Dioxins / Q000032:analysis*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D017745:Incineration; D009281:Naphthalenes / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001572:Benzofurans; D004147:Dioxins; D009281:Naphthalenes; D014874:Water Pollutants, Chemical; C023614:dibenzofuran; D011078:Polychlorinated Biphenyls; C020887:dibenzo(1,4)dioxin