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BIOAVAILABILITY: SCIENCE AND ACCEPTANCE
Citation:
RYAN, JAMES A. BIOAVAILABILITY: SCIENCE AND ACCEPTANCE. Presented at DOD Workshop "The Use of in-vitro Soil Metal Bioavailability Methodologies to Adjust Human and Ecological Risk Assessments", San Diego, CA, September 15, 2005.
Impact/Purpose:
To evaluate in situ remediation technologies.
Description:
Reducing risk from elevated levels of soil Pb involves removal, covering, or dilution by mixing with uncontaminated soil. Understanding that soil lead bioavailability is related to metal speciation and that in situ remediation techniques can alter metal speciation EPA's National Risk Management Research Laboratory (NRMRL) and DuPont Corporation established a collaborative effort to evaluate in situ remediation technologies. A field experiment at a Pb-contaminated urban site in Joplin, MO was established in the fall of 1996 as part of this collaborative effort. Reductions in Pb bioavailability (in vivo and in vitro) and changes in Pb geochemistry observed as a result of in situ treatment demonstrate that reduction in soil Pb risk can be accomplished without soil removal. Development of a more robust data set is required to quantify the relationships between the various in vivo models, the various in vitro models or an in vivo model and an in vitro model.