The Effect of Soil Properties on Metal Bioavailability: Field Scale Validation to Support Regulatory Acceptance
ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM OFFICE (DOD) ARLINGTON VA
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The U.S. Department of Defense DoD faces a potentially daunting task of remediating thousands of metal-contaminated sites within the U.S. and its territories that contain unacceptable levels of the toxic metalloids arsenic As, cadmium Cd, chromium Cr, and lead Pb. With the exception of Pb contaminated soils, human health and ecological risk drivers have prompted the U.S. Environmental Protection Agency EPA to assume that the total soil metal concentration is 100 bioavailable. Previous Strategic Environmental Research and Development Program SERDP funded research ER-1166 has shown that the ubiquitous metal-sequestering properties of soil can significantly lower the bioavailability and risk of heavy metals to human and ecological receptors. This investigation brought together regulators, EPA, end-users, and scientists to demonstrate the applicability of these concepts by showing that simple, readily available soil properties can often be used to predict the bioavailability of As, Cd, Cr, and Pb with a reasonable level of confidence. We have shown that in vitro methods can often be used for risk assessment of toxic metals in soil by comparing in vitro and in vivo metal bioavailability studies.
- Solid Wastes and Pollution and Control