Heavy Metal Accumulation in Roadside Soils and Grasses of Dhaka City, Bangladesh

Shihab Uddin, Shahnaj Parvin, Nahida Sultana, Zakir M. Hossain

Abstract


Heavy metals are important environmental pollutants and their toxicity in human, plants and animals has been received much more attention. A study was conducted to investigate the heavy metal pollution of roadside soil and grasses of Dhanka city, Bangladesh. The highest levels of metal concentrations were found in the samples from heavy traffic congestion. The results revealed that Cu, Pb, Zn, Cr and Cd levels in the roadside soils of Dhaka city were low compared to several cities of the world. In grass samples, the highest concentration of heavy metals were found in the order- Zn > Cu > Cr > Pb > Cd. The maximum concentration of Cu was found in the sample collected from Kalabagan and mean value was 85.20µg g-1, which was higher than critical toxic level for most plants. Similarly for Zn, a critical toxic level for plants is 100 µg g-1, which exceeded by the mean value obtained from the present study. The highest concentration of Pb and Cd were found in the samples collected from Soinik Club and Bijoy Saroni, respectively. The study revealed that the contamination factor for Pb, Zn and Cd were several times higher compared to Cu and Cr, which indicates that Pb, Zn and Cd were the major pollutants in the roadside soils. Finally, the Igeo calculations of the roadside soils of Dhaka city also revealed moderate pollution level in soils by Pb, Zn and Cd from anthropogenic sources in the study area.


Full Text: PDF DOI: 10.5539/jas.v6n3p176

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Journal of Agricultural Science ISSN 1916-9752 (Print) ISSN 1916-9760 (Online)

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