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Asian Journal of Plant Sciences
Year: 2005  |  Volume: 4  |  Issue: 2  |  Page No.: 159 - 163

Heavy Metals Accumulation in Potentially Contaminated Soils of NWFP

Midrar- ul-Haq, Riaz A. Khattak, Haji Khan Puno, M. Saleem Saif, Kazi Suleman Memon and Nabi Bux Sial    

Abstract: This study presents heavy metals accumulation in potentially contaminated soils of NWFP. Forty samples from each depth 0-20 and 20-40 cm were collected from soils receiving industrial effluents as irrigation water and eight samples (four samples from each depth) were collected from soils irrigated with tubewell waters considered as background soil. All the soil samples were analysed for heavy metals concentrations. The mean values of Cd, Cr, Ni and Pb in effluent irrigated soils were 0.12, 0.28, 5.64 and 6.30 mg kg-1 at 0-20 cm soil depth and 0.06, 0.18, 3.34 and 4.66 mg kg-1 in soil samples collected from 20-40 cm soil depth, respectively. However, the background soil values for Cd, Cr, Ni and Pb were 0.06, 0.12, 0.98 and 2.12 mg kg-1 at 0-20 cm soil depth and 0.04, 0.10, 0.25 and 1.66 mg kg-1 at 20-40 cm soil depth, respectively. The results showed that the concentrations of heavy metals were significantly higher in soils irrigated with effluents and the levels of these metals further increased in the surface soils as compared to sub-surface soils. The observation suggested strong impact of industrial effluents on accumulation of heavy metals in soils to levels considered above normal.

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