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Changes in induced polarization associated with the sorption of sodium, lead, and zinc on silica sands

Pierre Vaudelet 1, 2 André Revil 3 Myriam Schmutz 1, 2 Michel Franceschi 1, 2 Philippe Bégassat 2, 4
1 EGID - Environnement, Géo-ingénierie et Développement
2 ADEME - Agence de l'Environnement et de la Maîtrise de l'Energie
3 Géophysique des volcans & géothermie
ISTerre - Institut des Sciences de la Terre
4 ISTerre - Institut des Sciences de la Terre
Abstract : Low-frequency dielectric spectroscopy can be measured in terms of a conductance and a phase lag between the electrical current and the electrical field. This conductance and phase lag can be written as into a complex conductivity with both an in-phase and quadrature components that are frequency dependent. In sands, the low-frequency (10 mHz-40 kHz) spectra of the complex conductivity are dominated by the polarization of the electrical double layer (especially the internal part of the electrical double layer called the Stern layer) and the Maxwell-Wagner polarization (typically above 100 Hz). We present a polarization that is able to explain the complex conductivity spectra including the grain size distribution, the porosity, and the complexation of the mineral surface with the ions of the pore water. To test this model, we investigate the sorption of various cations (Na, Pb, Zn) characterized by different affinities with the surface of silica. Sand column experiments were carried out to see the change in the complex conductivity during the advective/dispersive transport of a lead nitrate solution and a zinc sulfate solution, replacing a sodium chloride solution in the pore space of the sand. The complex conductivity model is able to explain the change of the phase over time.
Keywords : Low-frequency dielectric spectroscopy Induced polarization Surface conductivity Silica Sand Electrical double layer Zinc Lead TLM
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Submitted on : Thursday, March 22, 2012 - 2:16:17 PM
Last modification on : Wednesday, September 22, 2021 - 3:40:04 PM

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Pierre Vaudelet, André Revil, Myriam Schmutz, Michel Franceschi, Philippe Bégassat. Changes in induced polarization associated with the sorption of sodium, lead, and zinc on silica sands. Journal of Colloid and Interface Science, Elsevier, 2011, 360 (2), pp.739-752. ⟨10.1016/j.jcis.2011.04.077⟩. ⟨insu-00681786⟩

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