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Atmospheric deposition, retention, and stream export of dioxins and PCBs in a pristine boreal catchment |
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| Authors: | Bergknut Magnus Laudon Hjalmar Jansson Stina Larsson Anna Gocht Tilman Wiberg Karin |
| Institution: | a Umeå University, Department of Chemistry, SE-901 87 Umeå, Sweden b Swedish University of Agricultural Sciences (SLU), Department of Forest Ecology and Management, SE-901 83 Umeå, Sweden c University of Tuebingen, Center for Applied Geoscience, 72076 Tuebingen, Germany d Swedish University of Agricultural Sciences (SLU), Department of Aquatic Sciences and Assessment, SE-750 07 Uppsala, Sweden |
| 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. |
| Keywords: | Dioxin Atmospheric deposition Diffuse pollution Retention Catchment |
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