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Integrating bioavailability approaches into waste rock evaluations

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Abstract

The presence of toxic metals in soils affected by mining, industry, agriculture and urbanization, presents problems to human health, the establishment and maintenance of plant and animal habitats, and the rehabilitation of affected areas. A key to managing these problems is predicting the fraction of metal in a given soil that will be biologically labile, and potentially harmful ('bioavailable'). The molecular form of metals and metalloids, particularly the uncomplexed (free) form, controls their bioavailability and toxicity in solution. One computational approach for determining bioavailability, the biotic ligand model (BLM), takes into account not only metal complexation by ligands in solution, but also competitive binding of hardness cations (Ca 2+,Mg 2+,) and metal ions to biological receptor sites. The more direct approach to assess bioavailability is to explicitly measure the response of an organism to a contaminant. A number of microbial enzyme tests have been developed to assess the impact of pollution in a rapid and procedurally simple way. These different approaches in making bioavailability predictions may have value in setting landuse priorities, remediation goals, and habitat reclamation strategies.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Integrating bioavailability approaches into waste rock evaluations
Year Published 2006
Language English
Publisher American Society of Mining and Reclamation
Publisher location Lexington, KY
Description 12 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Proceedings of the Seventh International Conference on Acid Rock Drainage
First page 1642
Last page 1653
Conference Title Seventh International Conference on Acid Rock Drainage
Conference Location St. Louis, MO
Conference Date 03/26/2006
Online Only (Y/N) N
Additional Online Files (Y/N) N