title: Atmospheric deposition, retention, and stream export of dioxins and PCBs in a pristine boreal catchment.
abstract: The mass-balance between diffuse atmospheric deposition of organic pollutants, amount of pollutants retained by the terrestrial environment, and levels of pollutants released to surface stream waters was studied in a pristine northern boreal catchment. This was done by comparing the input of atmospheric deposition of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) and PCBs with the amounts exported to surface waters. Two types of deposition samplers were used, equipped with a glass fibre thimble and an Amberlite sampler respectively. The measured fluxes showed clear seasonality, with most of the input and export occurring during winter and spring flood, respectively. The mass balance calculations indicates that the boreal landscape is an effective sink for PCDD/Fs and PCBs, as 96.0-99.9 % of received bulk deposition was retained, suggesting that organic pollutants will continue to impact stream water in the region for an extended period of time.
authors: Umeå University, Department of Chemistry, SE-901 87 Umeå, Sweden. magnus.bergknut@chem.umu.se
authors: Magnus
authors: M
authors: Bergknut
authors: Hjalmar
authors: H
authors: Laudon
authors: Stina
authors: S
authors: Jansson
authors: Anna
authors: A
authors: Larsson
authors: Tilman
authors: T
authors: Gocht
authors: Karin
authors: K
authors: Wiberg
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D001572:Benzofurans / Q000032:analysis / Q000737:chemistry; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D004787:Environmental Pollution / Q000706:statistics & numerical data; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry; D011891:Rain / Q000737:chemistry; D045483:Rivers / Q000737:chemistry*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D055814:Wilderness
chemical_list: D000393:Air Pollutants; D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls