Toxic Metal Contamination on the River near Industrial Area of Dhaka
Journal Title: Universal Journal of Environmental Research and Technology - Year 2012, Vol 2, Issue 2
Abstract
The present study investigates the anthropogenic metal input in to the river system, the toxic metal contamination in the sediment of the river and evaluates the dissolution of metal from soil to surface water or leaching through soil profile. Nine sampling stations along the river channel and three in the industrial canals are chosen and a set of surface water and sediment samples from each station were collected. Samples are analyzed for Fe, Mn, Cu, Cr, Pb, Ni, Cd, As and Zn by Atomic Absorption Spectrophotometer (AAS). The findings show that, toxic metals content among all the samples are distributed in a decreasing sequence of Fe>Mn>Zn>Ni>Cu>Cr>As>Pb>Cd. The content of the most toxic metals in wastewater and sediments of the industrial canals are much higher than that of river water and sediments. Moreover, most of the toxic metal contents are found to exceed the background concentration in all sediment samples. Higher geoaccumulation values are observed for Zn, Ni and Cu probably due to the anthropogenic metal supply with uncontrolled discharge of industrial effluents into the river. Further, higher enrichment factors are found for Zn, Ni and Cu suggesting also anthropogenic source of metals. Significant correlation is also observed among these, indicating the same source of occurrence. Partition coefficient, Kd values are found in the order: Ni>Zn>Cr>Cu>Pb and lower Kd values are found in the sediments near industrial area indicating much leaching or dissolution. Therefore, it can be concluded that sediments of the river close to industrial area is contaminated by toxic metals which enter into the food stuff and give rise to various health hazards of the inhabitants.
Authors and Affiliations
Mahfuza S. Sultana, Kulsum U1. , Shakila A. and Islam M. S
Keywords
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