title: Polychlorinated dibenzo-p-dioxin and dibenzofuran concentration profiles in sediments and flood-plain soils of the Tittabawassee River, Michigan.
abstract: Concentrations of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in sediments and flood-plain soils collected along the Tittabawassee River in Michigan ranged from 102 to 53,600 pg/g, dry wt. Mean PCDD/PCDF concentrations in downstream sediment and soil were from 10- to 20-fold greater than those found at locations upstream of Midland, Michigan. Concentrations of PCDD/PCDF in sediments and flood-plain soils from the Tittabawassee watershed were comparable to those found in industrialized areas such as the Housatonic and lower Passaic Rivers in the U.S. Concentrations of PCDDs/PCDFs in soil and sediment were not correlated with total organic carbon (TOC) in sediments or soils. OCDD and 2,3,7,8-TeCDF were the predominant congeners in sediment/soil collected from locations downstream of Midland, Michigan. Principal component analysis of the PCDD/PCDF congener profile suggested the presence of sources originating from a mixture of chlorophenol and other chlorinated compound production. Mass balance analysis of TCDD equivalents (TCDD-EQs) derived from H4IIE-luc bioassay of sediment extracts and 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQs) estimated from instrumental analysis suggested that PCDDs/PCDFs were the major dioxin-like compounds present in sediments. A significant correlation existed between bioassay-derived TCDD-EQs and instrumentally measured TEQs (r2 = 0.94).
authors.affiliation: National Food Safety and Toxicology Center, Department of Zoology, Institute for Environmental Toxicology, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: Klara
authors.initials: K
authors.lastname: Hilscherova
authors.forename: Kurunthachalam
authors.initials: K
authors.lastname: Kannan
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Nakata
authors.forename: Nobuyasu
authors.initials: N
authors.lastname: Hanari
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Yamashita
authors.forename: Patrick W
authors.initials: PW
authors.lastname: Bradley
authors.forename: John M
authors.initials: JM
authors.lastname: McCabe
authors.forename: Allan B
authors.initials: AB
authors.lastname: Taylor
authors.forename: John P
authors.initials: JP
authors.lastname: Giesy
mesh_terms: D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007221:Industry; D008824:Michigan; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants