ON THE SOURCES OF PCBs AND PBDEs TO LAKE MJØSA, NORWAY
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چکیده
Introduction Lake Mjøsa is the largest lake in Norway, with a surface area of 365 km. High levels of some contaminants in fish from the lake have caused public attention and concerns, and health authorities recommend that the consumption of certain species should be restricted. This study describes key results from an initial study aimed at identifying and quantifying the sources that control current levels of selected contaminants in lake Mjøsa. An important objective has been to evaluate the relative significance of the atmospheric pathway, including an assessment of local versus long-range atmospheric transport for selected PCBs (polychlorinated biphenyls) and PBDEs (polybrominated diphenyl ethers). A multimedia fate model has additionally been developed and evaluated as part of the project to evaluate (i) if the levels of PCBs in the lake can be explained by the current understanding of existing sources, as well as (ii) if there are significant knowledge gaps related to the sources, pathways and environmental fate of PCBs in lake Mjøsa.
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