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- Title
Barium and other trace metals as indicators of vehicle emissions
- Authors
Bargagli, R.; Monaci, F.
- Abstract
In the Siena urban environment, unwashed Q. ilex leaves had a significantly higher Al, Ba, Cr, Fe, Mn, Na, Ni, Pb, Ti, and V content thansamples from a neighbouring Mediterranean maquis. Significant relationships between element pairs indicated both the presence of metals emitted by motor vehicles and lithophilic elements, presumably from soil particles, resuspended by wind or turbulence generated by traffic.In order to minimize the effects of soil dust contamination and to seek clues to the metal sources, the estimated substrate contribution was subtracted from the raw concentrations of elements in Q. ilex leaves. Normalization for local soil composition confirmed that automotive emissions are the principal source of pollution in Siena. On the basis of a very significant relationship between normalized concentrations of Pb and Ba and the presence of the latter element in diesel and unleaded gasoline, Ba was recognized as a valuable tracer for vehicle emissions, in the place of Pb.
- Subjects
BIOINDICATORS; TRACE metals; CITIES &; towns; AIR pollution
- Publication
Water, Air & Soil Pollution, 1997, Vol 100, Issue 1-2, p89
- ISSN
0049-6979
- Publication type
Article