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| Title: | Evidence for microbial enhanced electrical conductivity in hydrocarbon-contaminated sediments |
| Author (s): | Atekwana, Estella A. Atekwana, Eliot A. Werkema, D. Dale Allen, Jonathan P. Smart, Laura A. Duris, Joseph W. Cassidy, Daniel P. Sauck, William A. Rossbach, Silvia |
| Department/Lab Affiliations: | Geological Sciences & Engineering |
| Keywords: | downhole method magnetic and electrical methods |
| Subject Terms: | Geophysics -- United States. Groundwater -- Quality. Hydrology -- United States. |
| Issue Date: | 2004 |
| Publisher: | American Geophysical Union |
| Citation: | Atwkwana, Estella A., Eliot A. Atekwana, D. Dale Werkema, Jonathan P. Allen, Laura A. Smart, Joseph W. Duris, Daniel P. Cassidy, William A. Sauck, and Silvia Rossbach. "Evidence for Microbial Enhanced Electrical Conductivity in Hydrocarbon-Contaminated Sediments." Geophysical Research Letters, vol. 31, 2004. |
| Abstract: | Bulk electrical conductivity of sediments during microbial mineralization of diesel was investigated in a mesoscale laboratory experiment consisting of biotic contaminated and uncontaminated columns. Population numbers of oil degrading microorganisms increased with a clear pattern of depth zonation within the contaminated column not observed in the uncontaminated column. Microbial community structure determined from ribosomal DNA intergenic spacer analysis showed a highly specialized microbial community in the contaminated column. The contaminated column showed temporal increases in bulk conductivity, dissolved inorganic carbon, and calcium, suggesting that the high bulk conductivity is due to enhanced mineral weathering from microbial activity. The greatest change in bulk conductivity occurred in sediments above the water table saturated with diesel. Variations in electrical conductivity magnitude and microbial populations and their depth distribution in the contaminated column are similar to field observations. The results of this study suggest that geophysical methodologies may potentially be used to investigate microbial activity. |
| Type: | Article - Journal text |
| In Title: | Geophysical Research Papers |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Pre-print: author can archive with restrictions;Restriction: remove when submitting for publication (if not a personal or departmental web site); Post-print: author can archive; FULL COPYRIGHT INFORMATION: |
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| title | Evidence for microbial enhanced electrical conductivity in hydrocarbon-contaminated sediments |
| contributor.author | Atekwana, Estella A. |
| contributor.author | Atekwana, Eliot A. |
| contributor.author | Werkema, D. Dale |
| contributor.author | Allen, Jonathan P. |
| contributor.author | Smart, Laura A. |
| contributor.author | Duris, Joseph W. |
| contributor.author | Cassidy, Daniel P. |
| contributor.author | Sauck, William A. |
| contributor.author | Rossbach, Silvia |
| contributor.deptlab | Geological Sciences & Engineering |
| subject | downhole method |
| subject | magnetic and electrical methods |
| subject.LCSH | Geophysics -- United States. |
| subject.LCSH | Groundwater -- Quality. |
| subject.LCSH | Hydrology -- United States. |
| date.issued | 2004 |
| publisher | American Geophysical Union |
| identifier.citation | Atwkwana, Estella A., Eliot A. Atekwana, D. Dale Werkema, Jonathan P. Allen, Laura A. Smart, Joseph W. Duris, Daniel P. Cassidy, William A. Sauck, and Silvia Rossbach. "Evidence for Microbial Enhanced Electrical Conductivity in Hydrocarbon-Contaminated Sediments." Geophysical Research Letters, vol. 31, 2004. |
| identifier.pub.URI | |
| description.abstract | Bulk electrical conductivity of sediments during microbial mineralization of diesel was investigated in a mesoscale laboratory experiment consisting of biotic contaminated and uncontaminated columns. Population numbers of oil degrading microorganisms increased with a clear pattern of depth zonation within the contaminated column not observed in the uncontaminated column. Microbial community structure determined from ribosomal DNA intergenic spacer analysis showed a highly specialized microbial community in the contaminated column. The contaminated column showed temporal increases in bulk conductivity, dissolved inorganic carbon, and calcium, suggesting that the high bulk conductivity is due to enhanced mineral weathering from microbial activity. The greatest change in bulk conductivity occurred in sediments above the water table saturated with diesel. Variations in electrical conductivity magnitude and microbial populations and their depth distribution in the contaminated column are similar to field observations. The results of this study suggest that geophysical methodologies may potentially be used to investigate microbial activity. |
| type | Article - Journal |
| type.DCMIType | text |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Pre-print: author can archive with restrictions;Restriction: remove when submitting for publication (if not a personal or departmental web site); Post-print: author can archive; |
| rights.URI | |
| relation.isPartOf | Geophysical Research Papers |
| date.available | 2008-07-29T19:12:59Z |
| identifier.persist.URI |