Redistribution of zinc, cadmium, and lead among soil fractions in a sandy calcareous soil due to application of poultry litter |
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Authors: | M Jalali G Khanboluki |
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Institution: | (1) Department of Soil Science, College of Agriculture, Bu-Ali Sina University, Janbazan Street, Hamadan, 65174, Iran |
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Abstract: | This study was conducted to evaluate, using soil columns, the mobilization and redistribution of heavy metals (Zn, Cd, and
Pb) among different soil fractions by soluble organic ligands within poultry litter. Uncontaminated soil was amended with
Zn, Cd, and Pb to achieve concentration levels of 400, 8, and 200 mg kg−1 soil, respectively. Columns repacked with this amended soil were leached with distilled water, 0.01 M EDTA, 0.01 M CaCl2, or poultry litter extract (PLE) solutions. After leaching, the soil samples in the columns were sequentially extracted for
exchangeable (EXC), carbonate (CARB) organic matter (OM), Mn oxide (MNO), Fe oxide (FEO), and residual (RES) fractions. Considerable
mobilization of Zn, Cd, and Pb occurred in soil during EDTA leaching. Leaching with PLE and CaCl2 solutions significantly decreased Zn and Cd concentrations in the EXC, CARB, and OM fractions. These solutions significantly
decreased Pb concentration in the EXC fraction, while PLE solubilized more Pb from EXC fraction than CaCl2. Thus, the applied poultry litter may change Zn, Cd, and Pb fractions in metal-amended soil and possibly enhance metal mobility. |
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Keywords: | Fractionation EDTA Heavy metals Leaching solution Metal-amended soil Poultry litter Calcareous soil |
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