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vol. 5, nr. 3 (2005)
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Influence of anthropogenic platinum on environment
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Monika Bojanowska
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Department of Chemistry, University of Agriculture, ul. Akademicka 15, 20-290 Lublin |
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vol. 5 (2005), nr. 3,
pp. 535-541
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abstract:
Platinum occurs naturally at very low concentrations. This situation is changing with the release of platinum-group-metals from automobile catalysts. Modern catalytic converters consist of a wash-coated cordierite monolith with Pt, Rh and/or Pd dispersed on the surface. Platinum and/or palladium are used to oxidize carbon monoxide and hydrocarbons, rhodium must be present to reduce nitrogen oxides. The use of catalytic converters on automobile exhaust has a significant effect by eliminating about 90% of impurities, but leads to emission of platinum. Consequently the platinum concentration in road dust and in soils along heavily frequented roads is increasing.
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keywords:
catalytic converter, platinum emission, environment
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original in:
Polish
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