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Adsorption of Cadmium on Biosolids-Amended Soils

Zhenbin Li, James A. Ryan, Jiann-Long Chen and Souhail R. Al-Abed

National Risk Management Research Lab., U.S. Environmental Protection Agency, 26 W. Martin Luther King Dr., Cincinnati, OH 45268



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  		Fig. 1. Phytoavailability of Cd in soils with history of biosolids amendments. Developed from Mahler et al. (1987). The Cd to organic carbon (OC) ratio was used to normalize Cd loading to compensate for the lower OC content in the biosolids-amended soils.

 


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  		Fig. 2. Effects of biosolids and organic carbon removal on Cd adsorption isotherms on Miamian silt loam at pH 5.5 in 0.01 M Ca(NO3)2 solution.

 


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  		Fig. 3. Effect of biosolids and organic carbon removal on Cd adsorption on soils at pH 6.5 in 0.01 M Ca(NO3)2 solution.

 


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  		Fig. 4. Effect of biosolids and organic carbon removal on Cd adsorption on soils at pH 5.5 in 0.01 M Ca(NO3)2 solution.

 


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  		Fig. 5. Effect of biosolids and organic carbon removal on Cd adsorption on soils at pH 4.5 in 0.01 M Ca(NO3)2 solution.

 


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  		Fig. 6. Effect of biosolids and organic carbon removal on Cd adsorption on soils in 0.01 M Ca(NO3)2 solution.

 


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  		Fig. 7. Average contribution of biosolids-amended and control soils and their inorganic fraction to Cd adsorption (percentage based on average of control soils at pH 6.5).

 




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The SCI Journals Agronomy Journal Crop Science
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