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  Identification and Characterization Methods for Reactive Minerals Responsible for Natural Attenuation of Chlorinated Organic Compounds in Ground Water (152 pp, 2.6 MB) (EPA/600/R-09/115) December 2009

This report is intended to facilitate the application of abiotic processes to remediate contamination from halogenated hydrocarbons in ground water. It is intended for scientists or engineers who design remedies for contaminated ground water or who review the remedial proposals of others. It reviews the literature on the rate of degradation of particular halogenated hydrocarbons on particular reactive minerals, provides information on currently available techniques to characterize the reactive minerals that may be present in aquifer material, and evaluates the prospects for applying the available analytical techniques to make a quantitative prediction of the rate or extent of degradation.

Ideally, this report would identify appropriate analytical techniques that are appropriate and sensitive for each class of reactive mineral and would provide equations that would relate the quantity or surface area of each mineral to the rate of degradation that might be expected. For iron(II) monosulfides, the current state of science approaches this expectation. For magnetite, the available technique is sensitive, but not particularly specific, and the predictions allowed by the current state of practice are only semi-qualitative. For green rusts, the kinetics of degradation are understood in simple laboratory systems, but the current state of science is not adequate to allow predictions of the rate of reaction in complex aquifer materials. For other reactive minerals, even less information is available.

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