title: Osmium in environmental samples from Northeast Sweden. Part II. Identification of anthropogenic sources.
abstract: Osmium (Os) concentrations and (187)Os/(188)Os isotope abundance ratios measured in epiphytic lichens from Northeast Sweden have been used for the identification of anthropogenic emission sources of this element. Based on isotope abundance ratios and similarities in spatial distributions between Os and chromium, smelters operated on chromium ores from Kemi deposits have shown to be the most important factor affecting the airborne Os burden in the region. The extent of the exposure is reflected by lichen concentrations near the source exceeding those from remote areas by a factor of 1000. Contributions from metal foundries processing iron, copper, lead and zinc ores can also be seen, though, because of lower Os concentrations in the feedstock, on a considerably lower scale. Masked by these industrial emissions in the studied area, the impact of Os originating from automotive catalytic converters cannot be resolved at present.
authors: Division of Applied Geology, Luleå University of Technology, S-971 87 Luleå, Sweden. ilia.rodushkin@alsglobal.com
authors: Ilia
authors: I
authors: Rodushkin
authors: Emma
authors: E
authors: Engström
authors: Dieke
authors: D
authors: Sörlin
authors: Christer
authors: C
authors: Pontér
authors: Douglas C
authors: DC
authors: Baxter
mesh_terms: D002857:Chromium / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D006802:Human Activities; D007554:Isotopes; D008011:Lichens / Q000737:chemistry; D008669:Metallurgy; D009992:Osmium / Q000032:analysis*; D013548:Sweden; D001335:Vehicle Emissions
chemical_list: D004785:Environmental Pollutants; D007554:Isotopes; D001335:Vehicle Emissions; D002857:Chromium; D009992:Osmium