wAbstract
@A total of 42 samples of road dust were collected along ring
road, city centre, city side, and freeway in Urumqi, China. Total
concentrations of Cd, Cr, Cu, Ni, Pb, Mn, Be, Co, Zn, and U were
determined by using the inductively coupled plasma-mass spectrometry
in order to assess and to compare road dust contamination levels
of metals among the four roads. The results show that, among the
four categories of roads, mean concentrations of Co and U vary
little. City centre locations show strong enrichments of Cd, Cu,
Pb, and Be. Along the ring rod, the highest mean concentrations
were found for Cr, Ni, Mn, and Co. However, the highest concentrations
of Zn and U were found along the freeway. The cluster analysis
shows that three main groups can be distinguished. Every group
may be associated with different main sources and concentrations
of the metals. The results of contamination assessment reveal
that, among all of the potential toxic metals, Cd, Cu, and Zn
pollution were obviously heavier with moderate or high contamination
indices for most road dust samples, while Cr, Ni, and Pb contamination
were lower along the four categories of roads. Compared with the
city side, Cd, Cu, Pb, Ni, and Zn contamination were heavier along
the ring road, the city centre, and the freeway with high traffic
density. Low Pb contamination or no contamination in all the road
dust samples may be related to the increasing usage of lead-free
petrol.
Keywords: Contamination assessment; Potential toxic metal; Cluster
analysis; Road dust; Urumqix
Introduction
Methodologies
@Study area
@Sampling sites
@Sampling procedure and analysis
@Assessment method of metal contamination
Results and discussion
@Levels of potential toxic metal concentration per area
@Cluster analysis (CA)
@Contamination assessment of potential toxic metal
Conclusions
Acknowledgments
References