The work presents analysis and assessment of the degree contamination of bottom sediments of the Wisłok river with polycyclic aromatic hydrocarbons (PAHs). The samples of the bottomsediments were taken in the summer in 2012 in 6 research points by Environmental Authoritiesunder the State Monitoring for Environment. The concentration of the sum of 17 PAHs in the bottomsediments ranged from 0.218–8.437 mg kg–1of dry weight. Among PAHs surveyed, 4-ring congenershad the largest share, and 3-ring ones had the smallest share. The highest concentration was registered in the case of fluoranthene, also four-cyclic benzo(a)anthracene and pyrene had a largeshare. Where as the lowest concentration was registered for acenaphthene, acenaphthylene and fluorene. The work also identifies possible sources of PAHs in the bottom sediments analysed. The method used to identify the source of origin of PAHs in bottom sediments is comparison of the quotient of concentrations of compounds characterised by L/H low and high molecular masses and comparison of measured concentrations of analysed PAHs, e.g. Phe/Ant, Flt/Py, Flt/(Flt+Py),Ant/(Ant+Phe) as well as IndP/(IndP+BghiP). The values of indicators used for this purpose indicated contamination with compounds from the PAHs group of pyrolytic origin.
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