Traffic-related platinum group elements (PGE) in soils from Mexico City |
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| Authors: | Ofelia Morton Harald Puchelt Elizabeth Hernndez Elena Lounejeva |
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| Institution: | a Instituto de Geofisica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico DF 04510, Mexico;b Institut für Petrographie and Geochemie der Universität, Karlsruhe, Germany;c Instituto de Geología, Universidad Nacional Autónoma de México, Cuidad Universitaria, Mexico D.F., Mexico |
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| Abstract: | The first evaluation of the distribution of platinum group elements (PGE) derived from automobile catalytic converters in urban soil samples in Mexico City was carried out. There are more than four millions cars in Mexico City and, at the present time, one third of them have catalytic converters. PGE concentrations in soils exposed to high traffic densities exceed the natural background values by upto two orders of magnitude and are directly influenced by traffic conditions. The highest concentrations of Pt, Pd and Rh in the analyzed samples are about 300, 70 and 40 μg/l, respectively. Although the PGE concentrations found in soil samples are relatively low, they represent an accumulation of only 10 yr. It is likely that the use of catalytic converters will dramatically change the distribution of these metals in the urban environment in the next decades. |
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| Keywords: | platinum-group elements (PGE) catalytic converter environment anthropogenic emissions |
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