Spatial distribution and contamination assessment of heavy metalsin urban road dusts from Dhaka city, Bangladesh
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 1
Abstract
Street dusts were collected from twenty two road side locations in Dhaka City, Bangladesh. Dusts samples were sieved below 90 µm and analyzed by Energy Dispersive X-ray Fluorescence (EDXRF) for eight toxic heavy metals (Pb, Cr, Cu, Cd, Ni, As, Zn and Mn). This study revealed that the concentrations of these metals were higher than that of the background value of the respective metals in soil. For the assessment of pollution level in the street dusts in Dhaka City, several important indices: enrichment factor (EF), pollution index (PI), pollution load index (PLI), and geo-accumulation index (Igeo) were followed in this study. ArcGIS software is used to generate the spatial distribution map for the heavy metals, which specifies high and low concentrated zone of toxic heavy metals in the study area. Enrichment factors analysis indicated the anthropogenic and natural sources of metal contamination. Pearson’s correlation coefficients analysis show that Cu, Pb, Cd, Ni, Zn, As and Mn which are significantly positively correlated, likely originate from common anthropogenic sources. Chromium was found at high concentrations in all the samples that seems also to have anthropogenic sources, but not the same ones as for the other contaminants. All the models agreed that contamination levels is in increasing order of Mn>Zn >Cr>Cu>Ni>Pb>Cd>As.
Authors and Affiliations
M. D. H. Khan, A. Talukder, M. Safiur. Rahman
Keywords
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- EP ID EP413958
- DOI 10.9790/5736-1101019099.
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