The aim of this work was to determine the content of the residues of the most commonly detected organohalogens and polychlorinated biphenyls in biomaterial. It is also the introduction of frogs as a new fine indicator of pollution in aquatic and terrestrial systems, due to their abundance all over Europe and their habitats in still and running waters. The residues of organohalogens and polyaromatic hydrocarbons in frog liver samples were taken from four sites - the river Danube and canal DTD in Vojvodina (northern part of Serbia), from the river Dubasnica near the town of Bor and in the Zlot canyon, Serbia, Yugoslavia. They were determined using gas chromatography with mass detector (GC/MS) and they indicate the high level of contamination of the chosen aquatic and terrestrial ecosystems by HCH, PCB, PAH and herbicides.

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