% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Strobel:917293,
      author       = {Strobel, C. and Abramov, S. and Huisman, J. A. and Cirpka,
                      O. A. and Mellage, A.},
      title        = {{S}pectral {I}nduced {P}olarization ({SIP}) of
                      {D}enitrification‐{D}riven {M}icrobial {A}ctivity in
                      {C}olumn {E}xperiments {P}acked {W}ith {C}alcareous
                      {A}quifer {S}ediments},
      journal      = {JGR / Biogeosciences},
      volume       = {128},
      number       = {1},
      issn         = {0148-0227},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2023-00523},
      pages        = {e2022JG007190},
      year         = {2023},
      abstract     = {Spectral Induced Polarization (SIP) has been suggested as a
                      non-invasive monitoring proxy for microbial processes. Under
                      natural conditions, however, multiple and often coupled
                      polarization processes co-occur, impeding the interpretation
                      of SIP signals. In this study, we analyze the sensitivity of
                      SIP to microbially-driven reactions under quasi-natural
                      conditions. We conducted flow-through experiments in columns
                      equipped with SIP electrodes and filled with natural
                      calcareous, organic-carbon-rich aquifer sediment, in which
                      heterotrophic denitrification was bio-stimulated. Our
                      results show that, even in the presence of parallel
                      polarization processes in a natural sediment under
                      field-relevant geochemical conditions, SIP is sufficiently
                      sensitive to microbially-driven changes in electrical charge
                      storage. Denitrification yielded an increase in imaginary
                      conductivity of up to 3.1
                      urn:x-wiley:21698953:media:jgrg22384:jgrg22384-math-0001
                      $(+140\%)$ and the formation of a distinct peak between 1
                      and 10 Hz, that matched the timing of expected microbial
                      activity predicted by a reactive transport model fitted to
                      solute concentrations. A Cole-Cole decomposition allowed
                      separating the polarization contribution of microbial
                      activity from that of cation exchange, thereby helping to
                      locate microbial hotspots without the need for
                      (bio)geochemical data to constrain the Cole-Cole parameters.
                      Our approach opens new avenues for the application of SIP as
                      a rapid method to monitor a system's reactivity in situ.
                      While in preceding studies the SIP signals of microbial
                      activity in natural sediments were influenced by mineral
                      precipitation/dissolution reactions, the imaginary
                      conductivity changes measured in the biostimulation
                      experiments presented here were dominated by changes in the
                      polarization of the bacterial cells rather than a
                      reaction-induced alteration of the abiotic matrix.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000998825900001},
      doi          = {10.1029/2022JG007190},
      url          = {https://juser.fz-juelich.de/record/917293},
}