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Modelling the fate of hydrophobic organic contaminants in a boreal forest catchment PDF Print E-mail

The MCN project “Landscape Regulation Of Contaminant Mobility” has within a framework of an associated project, headed by Associate Professor Karin Wiberg, recently published two scientific publications. This adresses the second article.
 The fate of hydrophobic organic compounds (HOCs) in soils and waters in a northern boreal catchment was explored through the development of a chemical fate model in a well-characterised catchment system dominated by two land types: forest and mire. Input was based solely on atmospheric deposition, dominated by accumulation in the winter snowpack. Release from soils was governed by the HOC concentration in soil, the soil organic carbon fraction and soil-water DOC content. The modelled export of selected HOCs in surface waters ranged between 11 and 250 ng day−1 during the snow covered period, compared to 200 and 9600 ng/d during snow-melt; highlighting the importance of the snow pack as a source of these chemicals. The predicted levels of HOCs in surface water were in reasonable agreement to a limited set of measured values, although the model tended to over predict concentrations of HOCs for the forested sub-catchment, by over an order of magnitude in the case of hexachlorobenzene and PCB 180. This possibly reflects both the heterogeneity of the forest soils and the complicated and changing hydrology experienced between the different seasons.

The fate of hydrophobic organic contaminants in a boreal forest catchment is connected to the flux of dissolved organic carbon and seasonal deposition.

Modelling the fate of hydrophobic organic contaminants in a boreal forest catchment: A cross disciplinary approach to assessing diffuse pollution to surface waters.

Environmental Pollution, Volume 158, Issue 9, September 2010, Pages 2964-2969

Authors: Magnus Bergknut, Sandra Meijer, Crispin Halsall, Anneli Agren, Hjalmar Laudon, Stephan Kohler, Kevin C. Jones, Mats Tysklind, Karin Wiberg

Direct web link: http://dx.doi.org/10.1016/j.envpol.2010.05.027