Air, Runoff And Soil Monitoring Of Highway
Pollution By Metals Along Highway Corridors
Author(s)
L.Y. Li & H. Preciado
Abstract
Heavy metal contamination resulting from vehicles is a continuing global
problem. This study monitored a highway, and evaluated the contribution of
traffic to metal contamination of roadside soils from atmospheric and runoff
processes. The metals investigated were Pb, Zn, Cu, Fe, and Mn. Dust deposition
measured using a Frisbee dust gauge showed a rapid decrease in deposition with
distance from the highway. Surface soil samples in the right-of-way (ROW)
exhibited a similar pattern for lead, copper and zinc up to the edge of the ROW
(12 m from the shoulder). At the edge of the ROW, deposition was still two or
three times greater than background dust loadings. Total metal concentrations in
runoff were consistent with road dust concentrations and decreased in
concentration in the order Fe>Zn>Mn>Cu≥Pb. Concentrations tended to increase
as road dust load continued to accumulat
Keywords
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