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环境科学学报 2006
Effect of sorption heavy metal Cd2+,Pb2+ onto soils with dissolved organic matter of landfill-leachate
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Abstract:
Batch adsorption experiments were carried out to investigate effect of dissolved organic matter(DOM) of landfill leachate derived from different landfill sites(0?4~5?12y) on the sorption of Cd~ 2 ,Pb~ 2 in the acidic and calcareous soil. The results showed that the sorption of Cd~ 2 ,Pb~ 2 in soils was enhanced in the presence of landfill-leachate DOM . The Sorption isotherm of Cd~ 2 ,Pb~ 2 in soils in the presence of different landfill leachate DOM could be described well by the Frenudlich eqation(R~2>0.94), and the Sorption of Cd~ 2 and Pb~ 2 in soils were 1.13 to 1.42 and 1.09 to 1.84 times higher than the control in Absence of landfill leachate DOM, respectively. At the same initial concentration of Cd~ 2 and Pb~ 2 , acidic soil demonstrated much less ability to retain the Cd~ 2 and Pb~ 2 than calcareous soil due to much lower pH in the former, and landfill-leachate of longer landfill age enhanced sorption of Cd~ 2 ,Pb~ 2 in soils in comparison with the shorter the landfill age of landfill-leachate. The results showed that in the presence of landfill leachate DOM, increase of Cd~2 ,Pb~2 sorption capacity in soils was obvious with an increase in pH.