Environmental assessment of Dhaka City (Bangladesh) based on trace metal contents in road dusts |
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| Authors: | Faruque Ahmed M Hawa Bibi Hiroaki Ishiga |
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| Institution: | (1) Department of Geoscience, Shimane University, Matsue 690-8504, Japan |
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| Abstract: | Geochemical analysis of street dusts was conducted to evaluate the environment of Dhaka City, Bangladesh. Dust samples were
collected from different areas (industrial, commercial, and residential) of Dhaka City, and their major, trace and rare earth
elements (REE) were determined. Samples from the commercial area had Pb concentrations double those of the industrial and
residential areas. Contents of Zn, Cu, Ni, and Cr in the industrial areas were greater than those in the commercial and residential
areas. The REE patterns of all dusts in Dhaka are similar and are comparable to the average upper continental crust. The condition
of the Dhaka environment was compared to that in Japan and other baseline sediments using Zn–Fe2O3 and Pb–Fe2O3 diagrams. Zn–Fe2O3 trends for the dusts show steep inclination compared to the baseline sediment and the Japanese urban sediment trends. Dhaka
lake data show enrichment of Zn over the dusts, suggestive of Zn pollution from poorly controlled industrial sources. In contrast,
on the Pb–Fe2O3 diagram, Dhaka dusts have greater Pb contents than lake sediments, probably due to the higher traffic density in the commercial
area compared to the residential area including the area around the lake. The results suggest that higher levels of Pb and
Zn in street dusts in Dhaka can most likely be attributed to the anthropogenic sources like vehicle emissions to the atmosphere
and a rapid development. |
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| Keywords: | Trace metal Rare earth elements Street dust Dhaka City environment |
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