Untersuchungen von Sedimentkernen des Bodensees I. Profile der polycyclischen aromatischen Kohlenwasserstoffe / Investigation on Drilling Cores of Sediments of Lake Constance I. Profiles of the Polycyclic Aromatic Hydrocarbons

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Abstract
The content of polycyclic aromatic hydrocarbons (PAH) from sediment layers of Bodensee areas differently exposed to environmental burden were determined. 32 PAH and 10 nitrogen containing PAH were identified by comparison with authentic samples. A method of quantitativ enrichment and gasdiromatographic determination of PAH containing 4-7 rings is described. In a comparative profile analysis only 20 most abundant PAH have been regarded. Low burdened areas (entre of the lake, 250m deep; Güttingen) show only 10 - 20% of the PAH content of high-burdened areas (mouth of Argen and Schüssen). The qualitative and quantitative composition of the PAH fraction (PAH-profile) from different layers of a sediment drilling core are very similar whereas profiles from different regions can be distinguished. The concentration of PAH increases from the surface to a layer with maximum burden (1965 - 1970) and then decreases to a remaining concentration (1900). From the typical PAH profile and some characteristic compounds as e.g. benzo (b) -naphtho (2,1-d) thiophan, benz (a/c) acridines, benzo (a/b/c)-carbazoles, dibenzacridines, and dibenzcarbazoles some potential sources as motor- car traffic, petroleum, fuel oil, and used lubricating oil can be excluded. Coal combustion smoke gas is supposed to be the main source of emission.

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