Geochemical processes controlling arsenic mobility in groundwater: A case study of arsenic mobilization and natural attenuation |
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| Authors: | Y Thomas He Arthur G Fitzmaurice Azra Bilgin Sunkyung Choi Peggy O’Day John Horst James Harrington H James Reisinger David R Burris Janet G Hering |
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| Institution: | 1. Department of Environmental Science and Engineering, California Institute of Technology, 1200 E. California Blvd., MC 138-78, Pasadena, CA 91125, USA;2. School of Natural Sciences, University of California, Merced, 5200 N. Lake Rd., Merced, CA 95343, USA;3. Arcadis G and M, Inc., 6 Terry Drive, Suite 300, Newtown, PA 18940, USA;4. Integrated Science and Technology, Inc., 1349 Old Highway 41, Marietta, GA 30060, USA |
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| Abstract: | The behavior of As in the subsurface environment was examined along a transect of groundwater monitoring wells at a Superfund site, where enhanced reductive dechlorination (ERD) is being used for the remediation of groundwater contaminated with chlorinated solvents. The transect was installed parallel to the groundwater flow direction through the treatment area. The ERD technology involves the injection of organic C (OC) to stimulate in situ microbial dechlorination processes. A secondary effect of the ERD treatment at this site, however, is the mobilization of As, as well as Fe and Mn. The concentrations of these elements are low in groundwater collected upgradient of the ERD treatment area, indicating that, in the absence of the injected OC, the As that occurs naturally in the sediment is relatively immobile. Batch experiments conducted using sediments from the site inoculated with an Fe(III)- and As(V)-reducing bacterium and amended with lactate resulted in mobilization of As, Fe and Mn, suggesting that As mobilization in the field is due to microbial processes. |
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