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    Electrodic voltages in the presence of dissolved sulfide: Implications for monitoring natural microbial activity

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    Zhang_2008.pdf (693.4Kb)
    Issue Date
    2008-03
    Author
    Slater, Lee
    Ntarlagiannis, Dimitrios
    Yee, Nathan
    O'Brien, Michael P.
    Zhang, Chi
    Williams, Kenneth H.
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Abstract

    There is growing interest in the development of new monitoring strategies for obtaining spatially extensive data diagnostic of microbial processes occurring in the earth. Open-circuit potentials arising from variable redox conditions in the fluid local-to-electrode surfaces (electrodic potentials) were recorded for a pair of silver-silver chloride electrodes in a column experiment, whereby a natural wetland soil containing a known community of sulfate reducers was continuously fed with a sulfate-rich nutrient medium. Measurements were made between five electrodes equally spaced along the column and a reference electrode placed on the column inflow. The presence of a sulfate reducing microbial population, coupled with observations of decreasing sulfate levels, formation of black precipitate (likely iron sulfide),elevated solid phase sulfide, and a characteristic sulfurous smell, suggest microbial-driven sulfate reduction (sulfide generation) in our column. Based on the known sensitivity of a silver electrode to dissolved sulfide concentration, we interpret the electrodic potentials approaching 700mV recorded in this experiment as an indicator of the bisulfide (HS−) concentration gradients in the column. The measurement of the spatial and temporal variation in these electrodic potentials provides a simple and rapid method for monitoring patterns of relative HS− concentration that are indicative of the activity of sulfate-reducing bacteria. Our measurements have implications both for the autonomous monitoring of anaerobic microbial processes in the subsurface and the performance of self-potential electrodes, where it is critical to isolate, and perhaps quantify, electrochemical interfaces contributing to observed potentials.
    URI
    http://hdl.handle.net/1808/21118
    DOI
    https://doi.org/10.1190/1.2828977
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1493]
    Citation
    Slater, Lee, Dimitrios Ntarlagiannis, Nathan Yee, Michael O'Brien, Chi Zhang, and Kenneth H. Williams. "Electrodic Voltages in the Presence of Dissolved Sulfide: Implications for Monitoring Natural Microbial Activity." Geophysics 73.2 (2008): F65-70

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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