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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 113, G02020, doi:10.1029/2007JG000614, 2008

Spectral induced polarization and electrodic potential monitoring of microbially mediated iron sulfide transformations

Yves Robert Personna

Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey, USA


Dimitrios Ntarlagiannis

Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey, USA


Lee Slater

Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey, USA


Nathan Yee

Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey, USA


Michael O'Brien

Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey, USA


Susan Hubbard

Lawrence Berkeley National Laboratory, Earth Science Division, Berkeley, California, USA


Abstract

Stimulated sulfate-reduction is a bioremediation technique utilized for the sequestration of heavy metals in the subsurface. We performed laboratory column experiments to investigate the geoelectrical response of iron sulfide transformations by Desulfovibrio vulgaris. Two geoelectrical methods, (1) spectral induced polarization (SIP), and (2) electrodic potential measurements, were investigated. Aqueous geochemistry (sulfate, lactate, sulfide, and acetate), observations of precipitates (identified from electron microscopy as iron sulfide), and electrodic potentials on bisulfide ion (HS−) sensitive silver-silver chloride (Ag-AgCl) electrodes (∼−630 mV) were diagnostic of induced transitions between anaerobic iron sulfide forming conditions and aerobic conditions promoting iron sulfide dissolution. The SIP data showed ∼10 mrad anomalies during iron sulfide mineralization accompanying microbial activity under an anaerobic transition. These anomalies disappeared during iron sulfide dissolution under the subsequent aerobic transition. SIP model parameters based on a Cole-Cole relaxation model of the polarization at the mineral-fluid interface were converted to (1) estimated biomineral surface area to pore volume (S p ), and (2) an equivalent polarizable sphere diameter (d) controlling the relaxation time. The temporal variation in these model parameters is consistent with filling and emptying of pores by iron sulfide biofilms, as the system transitions between anaerobic (pore filling) and aerobic (pore emptying) conditions. The results suggest that combined SIP and electrodic potential measurements might be used to monitor spatiotemporal variability in microbial iron sulfide transformations in the field.

Received 4 October 2007; accepted 26 February 2008; published 10 May 2008.

Keywords: biomineralization; induced polarization; electrodic potentials.

Index Terms: 0416 Biogeosciences: Biogeophysics; 0419 Biogeosciences: Biomineralization; 0614 Electromagnetics: Biological effects; 5109 Physical Properties of Rocks: Magnetic and electrical properties (0925).

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Citation: Personna, Y. R., D. Ntarlagiannis, L. Slater, N. Yee, M. O'Brien, and S. Hubbard (2008), Spectral induced polarization and electrodic potential monitoring of microbially mediated iron sulfide transformations, J. Geophys. Res., 113, G02020, doi:10.1029/2007JG000614.