title: Estimation of Polychlorinated Biphenyl Sources in Industrial Port Sediments Using a Bayesian Semifactor Model Considering Unidentified Sources.
abstract: Using the chemical balance method, and considering the presence of unidentified sources, we estimated the origins of PCB contamination in surface sediments of Muroran Port, Japan. It was assumed that these PCBs originated from four types of Kanechlor products (KC300, KC400, KC500, and KC600), combustion and two kinds of pigments (azo and phthalocyanine). The characteristics of these congener patterns were summarized on the basis of principal component analysis and explanatory variables determined. A Bayesian semifactor model (CMBK2) was applied to the explanatory variables to analyze the sources of PCBs in the sediments. The resulting estimates of the contribution ratio of each kind of sediment indicate that the existence of unidentified sources can be ignored and that the assumed seven sources are adequate to account for the contamination. Within the port, the contribution ratio of KC500 and KC600 (used as paints for ship hulls) was extremely high, but outside the port, the influence of azo pigments was observable to a limited degree. This indicates that environmental PCBs not derived from technical PCBs are present at levels that cannot be ignored.
authors.affiliation: Environmental and Geological Research Department, Institute of Environmental Sciences, Hokkaido Research Organization , N19W12, Kita-ku, Sapporo, Hokkaido, 060-0819 Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Anezaki
authors.affiliation: Research Center for Environmental Preservation, Osaka University , 2-4 Suita, Osaka, 565-0871 Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
authors.affiliation: The Institute of Statistical Mathematics , 10-3 Midori-cho, Tachikawa, Tokyo 190-8562, Japan.|SOKENDAI , Shonan Village, Hayama, Kanagawa, 240-0193, Japan.
authors.forename: Nobuhisa
authors.initials: N
authors.lastname: Kashiwagi
mesh_terms: D001499:Bayes Theorem; D019015:Geologic Sediments / Q000032:analysis*; D007221:Industry; D007564:Japan; D008962:Models, Theoretical; D010150:Paint / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D025341:Principal Component Analysis; D012767:Ships
chemical_list: D011078:Polychlorinated Biphenyls