Concentrations and chemical forms of potentially toxic metals inroad-deposited sediments from di erent zonesof Hangzhou, China
ZHANG Mingkui , WANG Hao
DOI:
Received June 08, 2008,Revised September 04, 2008, Accepted , Available online
Volume 21,2009,Pages 625-631
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The 25 road-deposited sediments were collected from five di erent 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 tra c. 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%), Pb (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, tra c, and industry.
