Decreasing Toxic Metal Bioavailability with Novel Soil Amendment Strategies
Abstract
The overall objective of this project is to develop an improved understanding and predictive capability of the enhanced immobilization and decreased bioaccessibility of hazardous metals in soil as a result of chemical amendment strategies. The specific objectives of this investigation are to: (1) Develop an improved understanding of the rates and mechanisms of enhanced metal sequestration in DoD soils that have been treated with various organic and inorganic amendment strategies. (2) Develop remedial protocols that maximize toxic metal sequestration and minimize bioaccessibility for a wide range of soil types and mixed metal systems encountered at DoD sites. (3) Develop an improved predictive capability for evaluating sequestration and bioaccessibility of mixed toxic metal systems for various amendments and soil types. The proposed research is motivated by our previous SERDP-sponsored research findings (CU-1166) that indicated the conditions that reduce metal bioaccessibility in soils, and more importantly for the current research, conditions that do not favor reduced metal bioaccessibility in soils. For example, the bioaccessibility of weakly bound soil metals, such as Cd and Pb, is typically not reduced to the same extent as strongly bound metals such as As and Cr. Certain soil conditions also promote the enhanced bioaccessibility of strongly sequestered metals such as As and Cr. Thus, engineered additions of materials to soil that enhance the sequestration of toxic metals can potentially induce the formation of less hazardous metal forms, providing a practical approach to in-place inactivation. In the following research, we will show that non-toxic, low-cost, commercially available materials can be incorporated into soil to immobilize toxic metals and decrease metal bioaccessibility for long time periods.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2007
- Accession Number
- ADA606692
Entities
People
- Jack C. Parker
- Mark O. Barnett
- Melanie A. Stewart
- Philip M. Jardine
- Scott E. Fendorf
Organizations
- Oak Ridge National Laboratory