Geochemistry of sediments and water with a health risk assessment of heavy metal contaminated vegetables grown in Dhapa, a waste disposal site in Kolkata, India
by Avijit Das; Dilip Kumar Bandopadhyay; Pravas Kumar Jee; Aparna Karmakar
World Review of Science, Technology and Sustainable Development (WRSTSD), Vol. 11, No. 3/4, 2014

Abstract: Dhapa, is a well known municipal solid waste (MSW) disposal site in the eastern part of the city of Kolkata. Geochemical study reported here shows that in its sediments, the concentration of Zn, Cu and Pb greatly exceed the average worldwide shale concentration. The water samples collected from tubewells, dugwells, pond and canals have elevated concentrations of Zn, Mn, Cr, Cu, Ni and Pb. The pollution load index values for the twenty sampling sites ranged from 1.03-6.44. High enrichment factors for Pb, Zn, Cr, Mn and Cu, imply high accumulation of metal toxins in leaves and edible portions of locally grown vegetables. The transfer factors for the different metals were in the order of TFNi > TFCr > TFCu > TFPb > TFMn. However, compared with the health hazard quotient of < 1 for heavy metals, except for Pb, the consumption of Dhapa vegetables showed a low health risk.

Online publication date: Wed, 14-Jan-2015

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