In situ Pb immobilization by phosphate rocks from Pb contaminated soils
- Univ. of Florida, Gainesville, FL (United States)
Extensive use and widespread disposal of Ph in the environment have resulted in numerous cases of Pb-contaminated soils and wastes. This study is to develop a methodology to immobilize Ph in situ in contaminated soils and wastes using phosphate rock [Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2}]. Various phosphate rock samples were reacted with Pb-contaminated soils. The phosphate rocks were effective in immobilizing dissolved Ph from contaminated soils with the percent of lead removal ranging from 4.73 to 100%. The main mechanism of Ph immobilization was through phosphate rock dissolution and precipitation of fluoropyromorphite [Pb{sub 10}(PO{sub 4}){sub 6}F{sub 2}]. However, precipitation of other Pb{sup 2+} minerals, Pb{sup 2+} adsorption, and cation substitution may have also occurred. While the parameters that influence the effectiveness of phosphate rocks in immobilizing dissolved Pb{sup 2+} from contaminated soils were not clear from this study, our results strongly suggests that in situ lead immobilization by phosphate rock may provide a cost-effective method for cleaning up Ph contaminated water, soils, and wastes.
- OSTI ID:
- 214664
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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