Abstract
In a 2-year period bulk precipitation, near surface groundwater and river water samples were simultaneously collected within 15 river basins of Northeastern Bavaria and analyzed among others for α-BHC,γ-BHC, fluoranthene, benzo-a-pyrene, indeno-cd-pyrene and benzo-ghi-perylene. With the aid of hydrographs the BHCs' and PAHs' annual loads had been calculated for river and groundwaters. The average loads of seven river basins each for two well-defined natural regions (the ancient earthblock and the scarplands) had been compared. Out of mass balances the following main conclusions were possible: (1) the input of BHCs and PAHs through bulk precipitation is about 30- to 400-fold higher than the river output in fairly natural, unpolluted rivers; atmospheric long range transport appears to be the main input source for both BHCs and PAHs. (2) Only 1 to 2% of the BHCs' and PAHs' input in the ancient earthblock and < 1% in the scarplands percolate into the surface groundwater, the scarplands being the more effectiv filter. (3) Land use of watersheds is so far only relevant for river water pollution by sewage effluents. There is neither significant evidence for precipitation input, nor for groundwater contamination.
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