Assessment of Heavy Metal Pollution Levels and Spatial Distribution in Road Dust (A Case Study in Health Centers of Yazd City)

Document Type : Original Article

Authors

1 PhD Student of Desertification Combating, Desert Control and Management Department, Faculty of Natural Resources and Geoscience, University of Kashan, Iran

2 Professor at Desert Control and Management Department, Faculty of Natural Resources and Geoscience, University of Kashan, Iran

3 Associate Professor, Department of Environmental Science and Engineering, Faculty of Natural Resources, University of Jiroft, Jiroft, Iran

4 Associate Professor at Department of Environment, Faculty of Natural Resources, University of Zabol, Zabol, Sistan, Iran

Abstract

The increase in pollution resulting from industrialization and urbanization has become an important concern in developing countries owing to its impact on human health. Therefore, in the present study, to investigate the pollution, 70 street dust samples were collected from medical centers in Yazd and in the laboratory to determine the content of Fe, Co, Mn, Zn, Pb, Cr, Cd, Ni, Cu, As and Al was digested using induction spectroscopy. The spatial pattern of the metal concentration was prepared using the Inverse Distance Weighted (IDW) interpolation method in GIS software. Pairwise correlation between metals was performed using Pearson's correlation, and classification of similar metals in terms of possible origin was performed using hierarchical clustering. In addition, the pollution level was determined using the enrichment factor, geo-accumulation index, pollution index, and integrated pollution index. According to the results, the trend of the average concentration of metals is Fe (23587.16), Al (18074.94), Zn (602.54 mg/kg), Mn (445.7 mg/kg), Pb (80.95 mg/kg), Cu (60.86 mg/kg), Cr (46.83 mg/kg), Ni (34.09 mg/kg), Co (10.2 mg/kg), As (0.29 mg/kg), and Cd (0.21 mg/kg). Based on the spatial distribution pattern, the highest concentrations of metals were observed in medical centers near the two-way street and single-line station. The highest amount of enrichment was observed for Zn, and as a result, a class of high enrichment was observed. The highest values of the soil accumulation index, degree of pollution, and uniform pollution were related to Zn and Pb. A significant correlation was observed between––Al and Fe Co–Mn Cr, Cd-Cr-Pb, and Ni-Cu elements at the 1% level, while As did not correlate with other elements. Based on the hierarchical clustering of elements, Co, Mn, Cr, Cd, Pb, Ni, Cu, and Zn were of human origin, while Al and Fe were of natural origin.

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Main Subjects


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