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Trace Element Emissions on Aerosols from Motor Vehicles John M. Ondov,+ Wllllam H. Zoller, and Glen E. Gordon’
Department of Chemistry, University of Maryland, College Park. Maryland 20742
rn Concentrations and size distributions of 27 elements in aerosols collected near a highway and in a highway tunnel were measured on filter and cascade-impactor samples. Concentrations of many elements rise strongly near highways due to entrainment of road dirt. These elements are predominantly associated with large particles that settle out near the highway. Concentrations of elements relative to P b on motor-vehicle aerosols of appreciable atmospheric residence time are as follows: Br, 0.39 f 0.05; C1,0.22 f 0.04; Ca, 0.11 f 0.045; Fe, 0.08 f 0.04; Mg, 0.075 f 0.030; Al, 0.07 f 0.02; Zn, 0.017 f 0.004; Ba, 0.015 f 0.004; Cu, 0.007 f 0.003; Mn, 0.003 f 0.001; Cd, 0.0024 f 0.0006; Sb, 0.0014 f 0.0003; Ni, 0.0008 f 0.0006; Co 0.00011 f 0.00004; Se O.ooOo81 f O.oooO34. The Ba/Pb ratio of aerosols from motor vehicles suggests that they are a major source of Ba in many U.S. cities. Except for Pb, Br, C1, and Ba, motor-vehicle contributions for most elements measured account for
