Effect of incubation temperature and wet-dry cycle on the availabilities of Cd, Pb and Zn in soil |
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Authors: | SI Ji-tao TIAN Bao-guo and WANG Hong-tao |
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Institution: | Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract: | The effect of incubation temperature and wet-dry cycle on the availabilities of Cd, Pb and Zn was studied. Three soils with pH ranging from 3.8 to 7.3, organic carbon (OC) from 0.7% to 2.4%, and clay from 12.3% to 35.6% were selected. Soils were spiked with reagent grade Cd(NO3)2, Pb(NO3)2, and Zn(NO3)2 at concentrations of 30 mg Cd/kg soil, 300 mg Zn/kg soil and 2000 mg Pb/kg soil. The soils were incubated at 35, 60, 105°C, respectively and went through four wet-dry cycles. Metal availability in soils was estimated by soil extraction with 0.1 mol/L Ca(NO3)2. According to this study, the effect of the spiking temperature on the metal availabilities was different among the metals, soils and wet-dry cycles. Mostly, 35°C was the first recommended spiking temperature for Cd and Pb while no spiking temperature was obviously better than others for Zn. Three wet-dry cycles was recommended regardless of the type of metals and incubation temperature. |
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Keywords: | availability wet-dry cycle cadmium (Cd) zinc (Zn) lead (Pb) |
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