Abstract
Infiltration facilities are expected to trap heavy metals emitted from urban traffic activities as well as to replenish groundwater. In this study, heavy metal contents were measured in inlet sediment, heavy traffic road dust, road dust in residential area and soil in pervious area. Heavy metal contents in inlet sediment in this study were comparable to those in soils in infiltration facilities in foreign countries. Enrichment factors were calculated to evaluate the level of anthropogenic contamination from urban traffic activities. It was revealed that Pb, Zn, Cu, Cd, Cr, and Ni were key pollutants in heavy traffic road dust. Principal component analysis showed that the first and second principal components could be regarded as indicators of urban traffic sources and natural sources, respectively. The scores of the first principal component in thick inlet sediments (≥8 cm) were significantly higher than those in thin inlet sediments (≤8 cm), road dust in residential area and soil in pervious area. Chromium, Cd and Pb contents in thick inlet sediments (≥8 cm) were significantly higher than those in thin inlet sediments (≤8 cm).
