Drinking water treatment residuals as an amendment to alkaline soils: Effects on bioaccumulation of heavy metals and aluminium in corn plants
2008
Mahdy, A.M.,Alexandria Univ. (Egypt). Dept. of Soil and Water | Elkhatib, E.A.,Alexandria Univ. (Egypt). Dept. of Soil and Water | Fathi, N.O.,Ministry of Agriculture, Cairo (Egypt). Salinity and Alkalinity Soils Research Lab.
An alum-based drinking water treatment residue (DWTR) is the by-product from the production of potable water. A greenhouse experiment was conducted to quantify the effects of DWTR on bioaccumulation of some heavy metals in plant tissues and to determine the effects of the DWTR on soil Al and Al phytotoxicity for corn plants in alkaline soils. The results indicated that DWTR application significantly decreased the amounts of extractable heavy metals in all studied soils. Combined analyses of all soils and rates of DWTR application showed a significant relationship between DTPA-extractable heavy metals and heavy metals uptake by corn plants. Addition of DWTR at different rates (10, 20, 30 and 40 g/kg) to different soil types did not have any toxic effects on corn plants grown in all studied alkaline agricultural soils because the application rates of DWTR did not increase the extractable Al in amended soils (more than 8 mg Al/kg). Combined analyses of all soils and rates of DWTR application showed a significant relationship between extractable Al and pH.
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