By National Research Council (U. S.) Commit
Bioavailability refers back to the volume to which people and ecological receptors are uncovered to contaminants in soil or sediment. the idea that of bioavailability has lately piqued the curiosity of the dangerous waste as an immense attention in determining how a lot waste to wash up. the reason is if contaminants in soil and sediment will not be bioavailable, then extra contaminant mass should be left in position with no developing extra possibility. a brand new NRC record notes that the opportunity of the respect of bioavailability to steer decision-making is maximum the place sure chemical, environmental, and regulatory components align. the present use of bioavailability in probability evaluation and dangerous waste cleanup laws is demystified, and applicable instruments and versions for bioavailability review are mentioned and ranked in response to seven standards. eventually, the intimate hyperlink among bioavailability and bioremediation is explored. The file concludes with feedback for relocating bioavailability ahead within the regulatory enviornment for either soil and sediment cleanup.
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Extra info for Bioavailability of Contaminants in Soils and Sediments: Processes, Tools, and Applications
In fact, there is ample reason to suspect that many bioavailability processes are dealt with inadequately or inaccurately. In order to improve this aspect of risk assessment, it will be necessary to identify relevant bioavailability processes in a more transparent way, to gain greater mechanistic understanding of these processes, and to evaluate the ability of various tools to offer information on bioavailability processes. Over the long term, such a process-based approach will improve exposure assessment, resulting in greater consistency, reliability, and defensibility in measurement, modeling, and prediction.
The first is that there should be pilot studies to experiment with different tools and models. The second is that agencies should use the results from such efforts to develop a common systematic approach to determine how and when to incorporate bioavailability concepts into regulations in a consistent manner. Adaptive management concepts are not new, but rather are akin to the scientific method and engineering problem solving. An adaptive management example relevant to bioavailability is the approach recently recommended by EPA for determining the efficacy of dredging and how much PCB-contaminated sediment to dredge from the Hudson River.
SUMMARY 17 the face of limited information and imperfect tools, weight-of-evidence approaches may prove useful. That is, the results of tests should be combined to provide “multiple lines of evidence” about bioavailability processes at a site. This approach is especially needed to make near-term progress at sites where appropriate mechanistic tools are lacking, such that empirical tools must initially be relied on. ) As more robust mechanistic methods evolve, the need for a multiple lines of evidence approach should diminish concomitant with our increasing ability to predict impacts, leading to greater acceptance of risk assessment that includes explicit consideration of bioavailability processes.