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Apatite and Phillipsite as Sequestering Agents for Metals and Radionuclides

A. S. Knox*,a, D. I. Kaplana, D. C. Adrianob, T. G. Hintonb and M. D. Wilsonb

a Westinghouse Savannah River Company, Aiken, SC 29808
b Savannah River Ecology Laboratory, Univ. of Georgia, Drawer E, Aiken, SC 29802



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  		Fig. 1. X-ray diffraction pattern for apatite and phillipsite. CPS, counts per second; Deg., °2{theta}. Values adjacent to peaks are measured in Angstroms (Å).

 


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  		Fig. 2. Sequential chemical extraction of Cd, Pb, and Zn from contaminated soil (control) and from contaminated soil amended with apatite and phillipsite at two levels of application (25 and 50 g kg-1). The percentage of each fraction was calculated based on the total element concentration in the soil.

 


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  		Fig. 3. Effect of apatite or phillipsite on redistribution of Cd, Pb, and Zn fractions in contaminated soil at two levels of application (25 and 50 g kg-1).

 


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  		Fig. 4. Yield of six-week-old maize and oat plants grown on contaminated soil (Ctrl) and on contaminated soil amended with two levels (25 and 50 g kg-1) of apatite (AP) or phillipsite (PZ); no oat grains were produced in the control.

 


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  		Fig. 5. Cadmium, Pb, and Zn concentrations (mg kg-1) in maize grown on contaminated soil (Ctrl) and on contaminated soil amended with two levels (25 and 50 g kg-1) of apatite (AP) or phillipsite (PZ).

 


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  		Fig. 6. Cadmium, Pb, and Zn concentration (mg kg-1) in oat plants grown on contaminated soil (Ctrl) and on contaminated soil amended with two levels (25 and 50 g kg-1) of apatite (AP) or phillipsite (PZ); no oat grains were produced in the control.

 


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  		Fig. 7. Transfer factor values (TF) for Cd, Pb, and Zn in maize and oat grown on contaminated soil (Ctrl) and on contaminated soil amended with two levels (25 and 50 g kg-1) of apatite (AP) or phillipsite (PZ); no oat grains were produced in the control.

 




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