Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 21, Issue 5, Pages 625-631Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(08)62317-7
Keywords
heavy metals; road-deposited sediment; BCR sequential extraction; multivariate analysis
Categories
Funding
- Natural Science Foundation of Zhejiang Province, China [R306011]
- National Basic Research Program (973) of China [2005CB121104]
- National Natural Science Foundation of China [40771090]
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The 25 road-deposited sediments were collected from five different land-use zones (industrial, residential, commercial, park, and countryside) in Hangzhou, China. The concentrations of metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in these samples were determined using ICP-AES after digestion with the mixture of HNO3-HF-HCl (aqua regia), and chemically fractionated according to the modified BCR (the European Community Bureau of Reference) sequential extraction procedure. The high metal concentration levels were detected in the sample from industrial zone and commercial zone having heavy traffic. While the low metal levels were noted in the street dust sample from residential zone, park, and countryside zone. The mobility sequence based on the sum of the BCR sequential extraction stages was: Zn (80.28%), Ph (78.68%), Cd (77.66%) > Cu (73.34%) > Mn (67.92%) > Co (41.66%) > Ni (30.36%) > Cr (21.56%), Fe (20.86%). Correlation analysis and principal component analysis were applied to the data matrix to evaluate the analytical results and to identify the possible pollution sources of metals. Factor analysis showed that these areas were mainly contaminated by three sources, namely lithology, traffic, and industry.
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