Grantee Research Project Results
2006 Progress Report: Environmental Risk Assessment of Phosphate-Based Remedial Technology in Metal Contaminated Urban and Mining Areas in a Selected Missouri Superfund Site
EPA Grant Number: R831071Title: Environmental Risk Assessment of Phosphate-Based Remedial Technology in Metal Contaminated Urban and Mining Areas in a Selected Missouri Superfund Site
Investigators: Yang, John , Eivazi, Frieda , Campbell, Marjorie
Institution: Lincoln University-MO
EPA Project Officer: Hahn, Intaek
Project Period: October 1, 2003 through December 31, 2006 (Extended to October 31, 2007)
Project Period Covered by this Report: October 1, 2005 through December 31, 2006
Project Amount: $397,975
RFA: Superfund Minority Institutions Program: Hazardous Substance Research (2002) RFA Text | Recipients Lists
Research Category: Hazardous Waste/Remediation , Land and Waste Management , Safer Chemicals
Objective:
The objective of this research project is to determine long-term health and ecological risk reductions of soil metals by in situ phosphate treatment and to evaluate environmental safety of the phosphate-based treatments through: (1) health and ecological assessments; (2) metal stability assessment; (3) chemical speciation; (4) microbial community assessment; and (5) water quality monitoring.
Progress Summary:
All field samples, including soils (top and subsoil), plants, and waters (surface and ground water), have been collected from the treatment plots of the residential, milling, and mine waste sites, respectively, in the Jasper County Superfund Site, southwest Missouri, before March 2006. A greenhouse study that evaluated the stability or leachability of metal phosphates in the presence of plants was conducted in early summer 2006. To date, most chemical and biological sample analyses, as proposed, have been completed. Our current efforts are mainly focusing on the sample analyses of metal solid speciation, data statistics, and report writing.
Preliminary data of the studies indicate that soil treatments, using phosphate-based amendments, induced the transformation of soil metals from labile Pb species to less soluble forms. The metal phosphates formed were relatively stable under the surface soil conditions. The resulting transformations have resulted in long-term, significant reductions of metal bioaccessibility, mobility, and plant uptake, which potentially reduce soil metal risks to human health, the plant community, and water quality. In addition, microbial analyses show that the phosphate treatments have minimal impacts on the microbial communities in treated soils in terms of microbial diversity, biomass, enzymatic activity, and toxicity. Results currently support our hypothesis that the risk reductions of soil metals by in situ phosphate treatments would be long-term and environmentally safe; The soil treatments would be a potential remedial alternative for safeguarding humans and ecosystems from heavy metal contamination in soil.
Future Activities:
We are planning to complete the electron-beam microscopic analyses of solid Pb speciation of selected soil samples in the next few weeks. Statistical analyses are currently in progress and are scheduled to be completed in May 2007. Our efforts will then focus on writing a final report, which is scheduled to be completed in October 2007.
Journal Articles on this Report : 2 Displayed | Download in RIS Format
Other project views: | All 22 publications | 3 publications in selected types | All 3 journal articles |
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Yang J, Mosby D. Field assessment of treatment efficacy by three methods of phosphoric acid application in lead-contaminated urban soil. Science of The Total Environment 2006;366(1):136-142. |
R831071 (2005) R831071 (2006) |
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Yang J, Deng BL, Li YL, Zhang CL. In-situ transformation of labile lead compounds to pyromorphites. Land Contamination & Reclamation 2007;15(4):453-458. |
R831071 (2006) |
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Supplemental Keywords:
Superfund site, Missouri, soil lead/zinc contamination, health and ecological risks, in situ immobilization, phosphate treatment, pyromorphite, risk reduction, lead, remediation, in vitro bioavailability, plant metal uptake, metal stability/leachability, solid/chemical speciation, soil microtoxicity, microbial biomass, microbial diversity, enzyme activity, surface/ground water quality, ecosystem, environmental quality, soil treatment impact, soil chemistry, soil remedial process, cost-effective/environmental-safe protection,, RFA, Scientific Discipline, INTERNATIONAL COOPERATION, Waste, Water, Geographic Area, TREATMENT/CONTROL, POLLUTANTS/TOXICS, Waste Treatment, Contaminated Sediments, Environmental Chemistry, Remediation, State, Hazardous Waste, Soil Contaminants, Ecological Risk Assessment, Ecology and Ecosystems, Environmental Engineering, Hazardous, Superfund site remediation, phosphate treatment, hazardous waste treatment, risk assessment, sediment treatment, in situ remediation, metal stabilization, contaminated waste sites, bioavailability, contaminated sediment, lead, contaminated soil, ecological impacts, metals-contaminated soil, phosphate remedial technology, water quality, Missouri (MO), hazardous waste sites, heavy metal contamination, mining waste, metal contamination, mining wastes, metal remediationProgress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.