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@ARTICLE{Izumoto:872612,
      author       = {Izumoto, Satoshi and Huisman, Johan Alexander and Wu, Yuxin
                      and Vereecken, Harry},
      title        = {{E}ffect of solute concentration on the spectral induced
                      polarization response of calcite precipitation},
      journal      = {Geophysical journal international},
      volume       = {220},
      number       = {2},
      issn         = {1365-246X},
      address      = {Oxford},
      publisher    = {Oxford Univ. Press},
      reportid     = {FZJ-2020-00105},
      pages        = {1187-1196},
      year         = {2020},
      abstract     = {Induced calcite precipitation is used in geotechnics to
                      modify the mechanical and hydrological properties of the
                      underground. Laboratory experiments have shown that spectral
                      induced polarization (SIP) measurements can detect calcite
                      precipitation. However, the results of previous studies
                      investigating the SIP response of calcite precipitation were
                      not fully consistent. This study aims to investigate how the
                      SIP response of calcite depends on solute concentration to
                      explain the differences in SIP response observed in previous
                      studies. A four-phase experiment with SIP measurements on a
                      column filled with sand was performed. In phase I, calcite
                      precipitation was generated for a period of 12 d by
                      co-injecting Na2CO3 and CaCl2 solutions through two
                      different ports. This resulted in a well-defined calcite
                      precipitation front, which was associated with an increase
                      in the imaginary part of the conductivity (⁠σ′′⁠).
                      In phase II, diluted solutions were injected into the
                      column. This resulted in a clear decrease in σ′′⁠. In
                      phase III, the injection of the two solutions was stopped
                      while calcite precipitation continued and solute
                      concentrations in the mixing zone decreased. Again, this
                      decreased σ′′⁠. Finally, the injection rate of the
                      Na2CO3 solution was reduced relative to that of the CaCl2
                      solution in phase IV. This resulted in a shift of the mixing
                      zone away from the calcite precipitation front established
                      in phase I and an associated decrease of σ′′⁠. These
                      results imply that the SIP response of calcite is highly
                      sensitive to the solute concentration near the precipitates,
                      which may explain previously reported conflicting results.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / ENIGMA - European training Network for In situ
                      imaGing of dynaMic processes in heterogeneous subsurfAce
                      environments (722028)},
      pid          = {G:(DE-HGF)POF3-255 / G:(EU-Grant)722028},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000506848400029},
      doi          = {10.1093/gji/ggz515},
      url          = {https://juser.fz-juelich.de/record/872612},
}