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| Title: | Field evidence for geophysical detection of subsurface zones of enhanced microbial activity |
| Author (s): | Atekwana, Eliot A. Atekwana, Estella A. Legall, Franklyn D. Krishnamurthy, R. V. |
| Department/Lab Affiliations: | Geological Sciences & Engineering |
| Keywords: | Downhole methods groundwater quality magnetic and electrical methods magnetic and electrical properties |
| Issue Date: | 2004 |
| Publisher: | American Geophysical Union |
| Citation: | Atekwana, Eliot A., Estella A. Atekwana, Franklyn D. Legall, and R.V. Krishnamurthy. "Field Evidence for Geophysical Detection of Subsurface Zones of Enhanced Microbial Activity." Geophysical Research Letters, vol. 31, 2004. |
| Abstract: | Geochemical data from closely spaced vertical intervals in a hydrocarbon-impacted aquifer were used to assess the relationship between bulk conductivity and zones of enhanced microbial activity. The bulk conductivity was measured using in situ vertical resistivity probes. Microbial activity was verified using terminal electron acceptors (nitrate, sulfate, iron, and manganese), dissolved inorganic carbon (DIC), and major ion chemistry. Peaks in bulk conductivity in the aquifer overlapped with zones where nitrates and sulfates were depleted, total petroleum hydrocarbon, iron, manganese, dissolved ions, and DIC were elevated, suggesting a link between higher electrical conductivity and zones of enhanced microbial activity stimulated by the presence of hydrocarbon. Thus the subsurface expression of microbial activity is apparently recorded in the bulk conductivity measurements. Our results argue for combining geophysics with biogeochemistry studies to delineate subsurface zones of enhanced microbial activity. |
| Type: | Article - Journal text |
| In Title: | Geophysical Research Letters |
| 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 | Field evidence for geophysical detection of subsurface zones of enhanced microbial activity |
| contributor.author | Atekwana, Eliot A. |
| contributor.author | Atekwana, Estella A. |
| contributor.author | Legall, Franklyn D. |
| contributor.author | Krishnamurthy, R. V. |
| contributor.deptlab | Geological Sciences & Engineering |
| subject | Downhole methods |
| subject | groundwater quality |
| subject | magnetic and electrical methods |
| subject | magnetic and electrical properties |
| date.issued | 2004 |
| publisher | American Geophysical Union |
| identifier.citation | Atekwana, Eliot A., Estella A. Atekwana, Franklyn D. Legall, and R.V. Krishnamurthy. "Field Evidence for Geophysical Detection of Subsurface Zones of Enhanced Microbial Activity." Geophysical Research Letters, vol. 31, 2004. |
| identifier.pub.URI | |
| description.abstract | Geochemical data from closely spaced vertical intervals in a hydrocarbon-impacted aquifer were used to assess the relationship between bulk conductivity and zones of enhanced microbial activity. The bulk conductivity was measured using in situ vertical resistivity probes. Microbial activity was verified using terminal electron acceptors (nitrate, sulfate, iron, and manganese), dissolved inorganic carbon (DIC), and major ion chemistry. Peaks in bulk conductivity in the aquifer overlapped with zones where nitrates and sulfates were depleted, total petroleum hydrocarbon, iron, manganese, dissolved ions, and DIC were elevated, suggesting a link between higher electrical conductivity and zones of enhanced microbial activity stimulated by the presence of hydrocarbon. Thus the subsurface expression of microbial activity is apparently recorded in the bulk conductivity measurements. Our results argue for combining geophysics with biogeochemistry studies to delineate subsurface zones of enhanced 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 Letters |
| date.available | 2008-07-29T17:20:00Z |
| identifier.persist.URI |