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In this study an interesting sampling medium - earthworm casts was examined in a highly Hg contaminated\udarea. Enrichment factor (EF) has been applied to assess elevated concentrations of analyzed elements in earthworm\udcasts and to determine elevated concentrations of these elements in soils and casts with regard to European average\udconcentrations in topsoil. In a previous study (Teršič & Gosar, 2012) it was shown that Hg contents and dispersion\udin casts from studied roasting site are comparable to those in soil, which indicates that soil contamination\udis substantially reflected in contamination of earthworm casts. Therefore the comparison between elemental\udconcentrations in earthworm casts and soil was investigated with the intention to assess the reflection of possible\udsoil contamination in casts. Besides Hg contamination, elevated concentrations of As, Ca, Cd, Mo, Pb and U were\udalso determined in earthworm casts. The calculated EFs show moderate enrichment of casts with Ca, Sr and P and\udminimal enrichment with Mg, Zn and Cu. Cast, SOM (surface organic matter rich soil layer) and soil enrichments\udwith regard to the European averages show extreme enrichment of all studied media with Hg, followed by significant\udenrichment with Mo and Cd and moderate enrichment with As. Spatial distributions of analyzed elements in casts\udmostly show similar pattern as in soil, however, because of the different nature of different earthworm species\udand specific properties of different elements, the data about cast contamination can only serve as an approximate\udprediction about the dispersion and distribution of contaminant in soil

Earthworm casts as a sampling medium – a case study from highly contaminated Hg roasting site Pšenk (Idrija area, Slovenia)