title: Particle-size-fractioned transfer of dioxins from sediments to water columns by resuspension process.
abstract: Particle-size-fractioned transfer of dioxins from sediments to water columns by resuspension process was investigated, using supernatant samples obtained from shaking experiments of sediment-water pairs simulating natural disturbances. The concentrations (dry-matter mass basis) of individual compounds (C(fraction)) in two particle size fractions (0.1-1 and 1-10 microm) in the supernatants were generally slightly higher than those in the original sediment (C(sed)). C(fraction)/C(sed) ratios ranged from 0.45 to 5.9 (median 1.5) without consistent differences among congener groups or consistent correlations against the number of chlorine atoms. The dioxin concentrations in the water column associated with the remaining sediment particles can therefore be estimated by those in the original sediment and by the concentration of suspended sediment particles in the water. The concentration of each compound in the remaining sediment particles (mostly 0.1-10 microm in size) can be roughly estimated by multiplying the concentration in the original sediment by 1.5.
authors.affiliation: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Kimiyoshi
authors.initials: K
authors.lastname: Kitamura
authors.forename: Takeo
authors.initials: T
authors.lastname: Sakurai
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Choi
authors.forename: Jun
authors.initials: J
authors.lastname: Kobayashi
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Imaizumi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Suzuki
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Morita
mesh_terms: D004147:Dioxins / Q000032:analysis*; D004463:Ecology / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D007564:Japan; D010316:Particle Size; D052638:Particulate Matter; D012989:Soil Pollutants / Q000737:chemistry*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004147:Dioxins; D052638:Particulate Matter; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical