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Geoelectrical measurement and modeling of biogeochemical breakthrough behavior during microbial activity

Geophysical Research Letters

By:
, , , ,
DOI: 10.1029/2009GL038695

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Abstract

We recorded bulk electrical conductivity (??b) along a soil column during microbially-mediated selenite oxyanion reduction. Effluent fluid electrical conductivity and early time ??b were modeled according to classic advectivedispersive transport of the nutrient medium. However, ??b along the column exhibited strongly bimodal breakthrough which cannot be explained by changes in the electrical conductivity of the pore fluid. We model the anomalous breakthrough by adding a conduction path in parallel with the fluid phase, with a time dependence described by a microbial population-dynamics model. We incorporate a delay time to show that breakthrough curves along the column satisfy the same growth model parameters and offer a possible explanation based on biomass-limited growth that is delayed with distance from influent of the nutrient medium. Although the mechanism causing conductivity enhancement in the presence of biomass is uncertain, our results strongly , suggest that biogeochemical breakthrough curves have been captured in geoelectrical datasets. Copyright 2009 by the American Geophysical Union.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geoelectrical measurement and modeling of biogeochemical breakthrough behavior during microbial activity
Series title:
Geophysical Research Letters
DOI:
10.1029/2009GL038695
Volume
36
Issue:
14
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters