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Urban areas and associated human activities (industry, traffi, processes of mining and ore extracting, etc.)\udhave induced anthropogenic emissions of potentially toxic trace elements (PTTE), which can present risk to living\udorganisms and ecosystems in case of enriched levels. An example of such area in Slovenia is the Idrija town, the\udcentral part of the second largest Hg mining district in the world, which is heavily contaminated with Hg in all\udenvironmental compartments. The knowledge about levels and distribution of other PTTE in Idrija is very limited\uddue to the outstanding Hg related problems. In this study the geochemical investigation of PTTE (As, Cd, Co, Cr, Cu,\udMo, Ni, Pb and Zn) was performed in urban stream and road sediments of Idrija town for the fist time. In addition,\udsolid phases of PTTE were observed using SEM/EDS and their potential sources were assessed. The results show\udthat the levels of PTTE in urban stream and road sediments are mostly below international guidelines, except for\udCu some high values were measured in road sediments. The highest Cu level was determined in the vicinity of a\udcommutator production industry. The associations of Cu with other elements in solid phases are very diverse, which\udis why the analyses could not reveal the specifi source of high Cu levels

Geochemical investigations of potentially toxic trace elements in urban sediments of Idrija