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Journal of Biological Sciences
Year: 2001  |  Volume: 1  |  Issue: 10  |  Page No.: 986 - 988

The Vertical Movement of Cadmium, Nickel and Lead Through Undisturbed Cores Having a Surface Amended of Sewage Sludge

J. Nouri, B. J. Alloway and P.J. Peterson    

Abstract: An experiment over a period of 14 months was carried out on duplicate undisturbed cores of 3 soils, with different textures using one sludge in order to obtain more information on the vertical movement of heavy metals through sludge treated soil. Over the first 8 months the pH values were in this order : sandy silt loam > sandy clay> loamy sand of both control and sludge amended soils. The rainwater pH values during the first 8 months were acidic, but during the following six months, they increased loan alkaline value. At the end weathering, it was found that only the amended surface and upper layers contained elevated concentrations of heavy metals. Thus the nature of soil was an extremely important factor in the downward movement of constituents. It appears that a guideline for sludge application to land the pH of soils should be maintained at or above 6.5. Groundwater pollution was likely to be the greatest in highly permeable sandy soils and these should not be used for the application of heavy metals. Soil water influenced the chemistry of surface waters and this affected the survival of fresh water fauna and flora.

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