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Concentrations and chemical forms of potentially toxic metals in road-deposited sediments from different zones of Hangzhou, China
Authors:ZHANG Mingkui  WANG Hao
Affiliation:1. Department of Natural Resource Science, College of Natural Resource and Environmental Sciences, Zhejiang University, Hangzhou 310029, China;Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310029, China
2. Department of Natural Resource Science, College of Natural Resource and Environmental Sciences, Zhejiang University, Hangzhou 310029, China
Abstract: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 the ICP-AES after digestion with the mixture of HNO3-HF-HCl (aqua regia), and chemically fractionated using the modified BCR (the European Community Bureau of Reference) sequential extraction procedure. The highest metal concentration level was detected in the sample from industrial zone and commercial zone having heavy traffic. While the lowest metal level was 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, traffic, and industry.
Keywords:heavy metals  road-deposited sediment  BCR sequential extraction  multivariate analysis
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