| DOI: | 10.2172/1042448
|
| 报告号: | DOE/FG/64520-F
|
| 报告题名: | Final Report for "Toward Quantifying Kinetics of Biotic and Abiotic Metal Reduction with Electrical Geophysical Methods" DE-FG02-08ER64520 |
| 作者: | Singha, Kamini; Brantley, Susan
|
| 出版年: | 2012
|
| 发表日期: | 2012-06-07
|
| 国家: | 美国
|
| 语种: | 英语
|
| 英文关键词: | Kinetics
; Biotic
; Abiotic
; Geophysical
; Quantifying
|
| 中文主题词: | 导电性
; 铁
; 含水层
|
| 主题词: | ELECTRICAL CONDUCTIVITY
; CONDUCTIVITY
; IRON
; AQUIFERS
|
| 英文摘要: | Although changes in the bulk electrical conductivity in aquifers have been attributed to microbial activity, electrical conductivity has never been used to infer biogeochemical reaction rates quantitatively. To explore the use of electrical conductivity to measure reaction rates, we conducted iron oxide reduction experiments of increasing biological complexity. To quantify reaction rates, we proposed composite reactions that incorporated the stiochiometry of five different types of reactions: redox, acid-based, sorption, dissolution/precipitation, and biosynthesis. In batch and column experiments, such reaction stiochiometries inferred from a few chemical measurements allowed quantification of the Fe-oxide reduction rate based on changes in electrical conductivity. The relationship between electrical conductivity and fluid chemistry did not hold during the latter stages of the column experiment when electrical conductivity increased while fluid chemistry remained constant. Growth of an electrically conductive biofilm could explain this late stage electrical conductivity increase. This work demonstrates that measurements of electrical conductivity and flow rate, combined with a few direct chemical measurements, can be used to quantify biogeochemical reaction rates in controlled laboratory situations and may be able to detect the presence of biofilms. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1042448
|
| Citation statistics: |
|
| 资源类型: | 研究报告
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40636
|
| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
|
| File Name/ File Size |
Content Type |
Version |
Access |
License |
|
|---|
| 1042448.pdf（109KB） | 研究报告 | -- | 开放获取 | | View
Download
|
|
| Recommended Citation: | |
Singha, Kamini,Brantley, Susan. Final Report for "Toward Quantifying Kinetics of Biotic and Abiotic Metal Reduction with Electrical Geophysical Methods" DE-FG02-08ER64520. 2012-01-01.
|
|
|