Quantifying the Bioavailability of Toxic Metals in Soil
AUBURN UNIV AL
Pagination or Media Count:
The primary objective of this research was to investigate the relative bioavailability of the toxic metals lead Pb, cadmium Cd, arsenic As, and chromium Cr in soils, particularly in relation to the human health risk posed by soil ingestion, which often controls the degree of clean-up required at metal-contaminated sites. These metals were selected because they are the metals of greatest concern at Department of Defense DoD facilities Exponent, 2001. The research was motivated by the following hypotheses Hypothesis 1 The ubiquitous metal-sequestering properties of soil will significantly lower the relative bioavailability of ingested metals when compared to the 100 default relative bioavailability values currently used in risk assessments. Hypothesis 2 Key soil physical and chemical properties particle size, CEC, pH, Fe, Mn, and natural organic matter NOM concentration will be good predictors of soil-metal bioavailability. Hypothesis 3 Metal bioavailability is controlled by molecular-level speciation, where metal sequestration and solid phase stability are enhanced by increased soil-metal residence time.
- Anatomy and Physiology
- Geology, Geochemistry and Mineralogy
- Metallurgy and Metallography
- Solid Wastes and Pollution and Control