| Abstract: | In April 1996, a phytoremediation field demonstration site at the Naval Air Station, Fort Worth, Texas, was developed to remediate shallow oxic ground water (< 3.7 m deep) contaminated with chlorinated ethenes. Microbial populations were sampled in February and June 1998. The populations under the newly planted cottonwood trees had not yet matured to an anaerobic community that could dechlorinate trichloroethene (TCE) to cis-1,2-dichloroethene (DCE); however, the microbial population under a mature (???22-year-old) cottonwood tree about 30 m southwest of the plantings had a mature anaerobic population capable of dechlorinating TCE to DCE, and DCE to vinyl chloride (VC). Oxygen-free sediment incubations with contaminated groundwater also demonstrated that resident microorganisms were capable of the dechlorination of TCE to DCE. This suggests that a sufficient amount of organic material is present for microbial dechlorination in aquifer microniches where dissolved O2 concentrations are low. Phenol, benzoic acid, acetic acid, and a cyclic hydrocarbon, compounds consistent with the degradation of root exudates and complex aromatic compounds, were identified by gas chromatography/mass spectrometry (GC/MS) in sediment samples under the mature cottonwood tree. Elsewhere at the site, transpiration and degradation by the cottonwood trees appears to be responsible for loss of chlorinated ethenes. |
| Genre: | Article |
| ProdID: | 70025642 |
| Citation Author: | Godsy, E. M.; Warren, E.; Paganelli, V. V. |
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| Citation End Page: | 87 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Journal of Phytoremediation |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | The role of microbial reductive dechlorination of TCE at a phytoremediation site; 2003; Article; Journal; International Journal of Phytoremediation; Godsy, E. M.; Warren, E.; Paganelli, V. V. |
| Citation Start Page: | 73 |
| Citation Volume: | 5 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | The role of microbial reductive dechlorination of TCE at a phytoremediation site; 2003; Article; Journal; International Journal of Phytoremediation; Godsy, E. M.; Warren, E.; Paganelli, V. V. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1080/16226510390856484 |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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