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Identification of magnetic particulates in road dust accumulated on roadside snow using magnetic, geochemical and micro-morphological analyses |
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| Authors: | Bu?ko Micha? S Magiera Tadeusz Johanson Bo Petrovský Eduard Pesonen Lauri J |
| Institution: | a Division of Geophysics and Astronomy, Department of Physics, P.O. Box 64, Gustaf Hällströmin katu 2, 00014 University of Helsinki, Finland b Institute of Environmental Engineering, Polish Academy of Sciences, ul. Sklodowskiej-Curie 34, 41-819 Zabrze, Poland c Department of Land Protection, Opole University, ul. Oleska 22, 45-052 Opole, Poland d Electron Optical Laboratories (EPMA, SEM-EDS), Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland e Institute of Geophysics ASCR, Bo?ní II/1401, 141 31 Prague 4, Czech Republic |
| Abstract: | The aim of this study is to test the applicability of snow surveying in the collection and detailed characterization of vehicle-derived magnetic particles. Road dust extracted from snow, collected near a busy urban highway and a low traffic road in a rural environment (southern Finland), was studied using magnetic, geochemical and micro-morphological analyses. Significant differences in horizontal distribution of mass specific magnetic susceptibility (χ) were noticed for both roads. Multi-domain (MD) magnetite was identified as the primary magnetic mineral. Scanning electron microscope (SEM) analyses of road dust from both roads revealed: (1) angular-shaped particles (diameter ∼1-300 μm) mostly composed of Fe, Cr and Ni, derived from circulation of motor vehicles and (2) iron-rich spherules (d ∼ 2-70 μm). Tungsten-rich particles (d < 2 μm), derived from tyre stud abrasion were also identified. Additionally, a decreasing trend in χ and selected trace elements was observed with increasing distance from the road edge. |
| Keywords: | Road dust Snow Vehicle emissions Magnetic properties Geochemical analyses |
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