title: Historical changes in the concentrations of polycyclic aromatic hydrocarbons (PAHs) in Lake Peipsi sediments.
abstract: The distribution of 11 individual polycyclic aromatic hydrocarbons (PAHs) was analysed in a (210)Pb dated sediment core from the deepest area of Lake Peipsi and in four surface sediment samples taken from littoral areas. According to the concentrations in the core three groups of PAHs may be distinguished: (1) relatively stable concentrations of PAHs within the whole studied time interval; (2) very low concentrations in sediments accumulated before intensive anthropogenic impact (from 19th century up to the 1920s) following a slight increase and (3) an overall increase in PAH concentrations since the 1920s up to the present. Comprehensive analysis of PAHs in the core and monitoring data obtained in the 1980s together with the lithology of sediments show that an increase of anthropogenically induced PAHs correlates well with the history of fuel consumption in Estonia and speaks about atmospheric long-distance transport of PAHs. The continuous increase of PAH concentrations since the 1920s do not support the earlier hypothesis about the dominating impact of the oil shale fired power plants near the lake, because their emissions decreased significantly in the 1990s. The concentration of PAHs in the deep lake core sample correlates well with the content of organic matter, indicating absorption and co-precipitation with plankton in the sediment.
authors.affiliation: Institute of Ecology at Tallinn University, Uus-Sadama 5, Tallinn, Estonia. punning@tlu.ee
authors.forename: Jaan-Mati
authors.initials: JM
authors.lastname: Punning
authors.forename: Jaanus
authors.initials: J
authors.lastname: Terasmaa
authors.forename: Tiit
authors.initials: T
authors.lastname: Vaasma
authors.forename: Galina
authors.initials: G
authors.lastname: Kapanen
mesh_terms: D000818:Animals; D004784:Environmental Monitoring / Q000266:history*; D004787:Environmental Pollution; D004957:Estonia; D005579:Fossil Fuels; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000266:history; D012426:Russia; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000266:history
chemical_list: D005579:Fossil Fuels; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical