Carbon Tetrachloride Degradation Reaction Mechanisms (Amonette/Bylaska EMSP-CCl4, PNNL Scope #44012)
EMSL Project ID
4390
Abstract
Characterize the mechanisms and kinetics of competing degradation reactions of carbon tetrachloride (CCl4) through laboratory experiments in simple model systems closely coordinated with theoretical modeling studies.Work authorization text added 08/11/05:
Most approaches that have been proposed for the remediation of groundwater contaminated with carbon tetrachloride (CCl4) have produced chloroform (CHCl3) as the major product and methylene chloride (CH2Cl2) as a minor product. Both of these products are nearly as persistent and problematic as the parent compound, but competing reaction pathways produce the more desirable products carbon monoxide (CO) and/or formate (HCOO-). Branching between these reaction pathways is highly variable, but the controlling factors have not been identified. If we understood the fundamental chemistry that controls the branching among these and related product-formation pathways, we could improve the applicability of a host of remediation technologies (both chemical and biological) to the large plumes of CCl4 that contaminate DOE sites across the country. This project will provide the first complete characterization of the mechanisms and kinetics of competing degradation reactions of CCl4 through laboratory experiments in simple model systems closely coordinated with theoretical modeling studies. The results provide strategies for maximizing the yield of desirable products from CCl4 degradation, and the most promising of these will be tested in column model systems using actual site waters and matrix materials. The project is a joint effort with Oregon Health and Science University and PNNL. Contact Cal Ainsworth, project manager, for additional information. Assumptions - The DOE client (Office of Biological and Environmental Research) expects us to conduct fundamental research to further our knowledge in areas of importance to DOE's mission, and to disseminate this knowledge through publications in peer-reviewed journals and presentations of results at scientific meetings. Products/Deliverables: - Publications in scientific journals - Presentations at scientific meetings and symposia.
Project Details
Project type
Exploratory Research
Start Date
2002-10-01
End Date
2007-06-03
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
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