Assessment of heavy metal contamination of roadside soils in Southwest China |
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Authors: | Junhong Bai Baoshan Cui Qinggai Wang Haifeng Gao Qiuyi Ding |
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Institution: | (1) State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 19 Xinjie Kou Wai Street, Beijing, 100875, People’s Republic of China;(2) Appraisal Center of Environment and Engineering, State Environmental Protection Administration, Beijing, 100012, People’s Republic of China |
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Abstract: | Topsoil (0–20 cm) samples were collected from the edge of roads to the locations about 200 m off the roads along the four
roads with different transportation periods in October 2005. Total concentrations of As, Cd, Cr, Cu, Ni, Pb and Zn were determined
using the inductively coupled plasma atomic absorption spectrometry in order to assess and compare road transportation pollution.
Results showed that with the exception of As, Cu and Pb, the average concentrations of heavy metals were generally, higher
than the regional elemental background values. Most soil samples were moderately or highly polluted by Cd or Ni, but the contamination
index (P
i
) values for As, Pb and Zn were lower than other heavy metals in all sites. Among the four roads, heavy metal pollution was
heavier for Dali Road due to longer transportation periods, while low or no contamination could be observed for the other
roads. However, the integrated contamination index (P
c
) values showed a generally low contamination or no contamination level for all soil samples in this region, followed by the
order of Dali Road > Dabao Highway > Road 320 > Sixiao Highway. The same pollution source of these heavy metals was found
using factor analysis. |
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Keywords: | Heavy metals Roadside soils Transportation period Contamination index Integrated contamination index |
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