Inderscience Publishers

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

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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 TF
Ni
> TF
Cr
> TF
Cu
> TF
Pb
> TF
Mn
. 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.

Keywords: municipal solid waste, MSW, Dhapa, heavy metal, enrichment factor, pollution load index, health risk assessment, India

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