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Transcript
Field applications of phosphate rock for remediation of metal contaminated soils Ma, L. Q., W. Harris, and R.H. Stamps 4/2002-3/2006 Lead and arsenic contamination is of great environmental concern due to their adverse health effects on humans and animals, and the extent and severeness of the contamination. Successful remediation of metal-contaminated soils would provide significant environmental and monetary benefits. The proposed research examines two cost-effective and environmentally-friendly remediation technologies, i.e. in situ lead immobilization using P amendments and arsenic phytoremediation using plant. It integrates three separate projects, which all utilize phosphate rock (PR), into an integrated synergetic one. The primary objectives are to: 1) assess long-term effectiveness of P amendments in immobilizing lead in contaminated soils; 2) explore the feasibility of using PR to remediate lead contaminated soils from shooting ranges; 3) evaluate the beneficial effects of PR in enhancing phytoremediation of arsenic contaminated soils using a newly discovered hyperaccumulating plant. For the 1st objective, efforts will be focused on biologically and chemically evaluating metal bioavailability on a long term basis, which is critical for the technology acceptance. Plant uptake study, in vitro bioavailability assay, microbial toxicity assay, TCLP test and sequential extraction will be used. For the 2nd objective, efforts will be concentrated on the effectiveness of PR in reducing lead availability in soils from shooting ranges due to increased soil pH and reduced lead solubility. Efforts will also be spent on determining the optimum PR application rates and characterization of a shooting range for field application. For the 3rd objective, efforts will be centered on the effectiveness and optimum application rates of PR in enhancing arsenic uptake due to increased soil arsenic via increasing phosphate and soil pH, and characterization of an arsenic contaminated soil. PR will be applied to a selected shooting range and an arsenic contaminated soils, and soil, groundwater, and plant samples will be collected and analyzed to assess the effectiveness of PR in remediating metal contaminated soils. The demonstrated effectiveness of using P amendments to reduce metal bioavailability for lead immobilization and increase arsenic bioavailability for phytoremediation in the field will greatly increase the visibility and acceptability of these relatively new technologies to treat metal-contaminated soils. Demand for these technologies will substantially drive the market values for P amendments, especially phosphate rock. Soil and Water Science Department University of Florida