title: Estimation of sources and inflow of dioxins and polycyclic aromatic hydrocarbons from the sediment core of Lake Suwa, Japan.
abstract: To elucidate the historical changes in polychlorinated dibenzo-p-dioxin (PCDD), polychlorinated dibenzofuran (PCDF), coplanar polychlorinated biphenyl (co-PCB), and polycyclic aromatic hydrocarbon (PAH) inflows in Lake Suwa, their concentrations in the sediment core were analyzed in 5 cm interval. The maximum concentrations (depth cm) of PCDDs/DFs, co-PCBs, and PAHs were 25.2 ng/g dry (30-35 cm), 19.0 ng/g dry (30-35 cm), and 738, 795 ng/g dry (50-55 cm, 30-35 cm), respectively. Age and sedimentation rate of the sediment were estimated from the vertical changes in apparent density. Deposition rate of dioxins and PAHs were calculated from the concentration and sedimentation rate of the sediment. The results indicate that large amounts of dioxins and PAHs flowed into the lake in flood stage compared to normal stage.
authors.affiliation: Research and Education Center for Inlandwater Environment, Shinshu University, 5-2-4 Kogandori, Suwa, Nagano 392-0027, Japan. s03a601@amail.shinshu-u.ac.jp
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Ikenaka
authors.forename: Heesoo
authors.initials: H
authors.lastname: Eun
authors.forename: Eiki
authors.initials: E
authors.lastname: Watanabe
authors.forename: Fujio
authors.initials: F
authors.lastname: Kumon
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Miyabara
mesh_terms: D001572:Benzofurans / Q000032:analysis; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D007564:Japan; D011078:Polychlorinated Biphenyls / Q000032:analysis; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D011891:Rain; D012989:Soil Pollutants / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls