Interpretation of electrochemical impedance spectroscopy (EIS) circuit model for soils

Peng ju Han, Ya feng Zhang, Frank Y. Chen, Xiao hong Bai

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Based on three different kinds of conductive paths in microstructure of soil and theory of electrochemical impedance spectroscopy (EIS), an integrated equivalent circuit model and impedance formula for soils were proposed, which contain 6 meaningful resistance and reactance parameters. Considering the conductive properties of soils and dispersion effects, mathematical equations for impedance under various circuit models were deduced and studied. The mathematical expression presents two semicircles for theoretical EIS Nyquist spectrum, in which the center of one semicircle is degraded to simply the equivalent model. Based on the measured parameters of EIS Nyquist spectrum, meaningful soil parameters can easily be determined. Additionally, EIS was used to investigate the soil properties with different water contents along with the mathematical relationships and mechanism between the physical parameters and water content. Magnitude of the impedance decreases with the increase of testing frequency and water content for Bode graphs. The proposed model would help us to better understand the soil microstructure and properties and offer more reasonable explanations for EIS spectra.

Original languageEnglish (US)
Pages (from-to)4318-4328
Number of pages11
JournalJournal of Central South University
Issue number11
StatePublished - Nov 1 2015

All Science Journal Classification (ASJC) codes

  • General Engineering
  • Metals and Alloys


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