On the pore water chemistry effect on spectral induced polarization measurements in the presence of pyrite

Placencia-Gómez, Edmundo; Slater, Lee

doi:10.1016/j.jappgeo.2015.11.001

Cited by 14 publications

(4 citation statements)

References 51 publications

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“…For full saturation where the inner pores of biochar are saturated and connected, it was found that ϕ(ω) and M mainly depend on the amount of biochar, and that τ 0 depends on the particle size of biochar and on the electrical conductivity of the water in the porous media. The relationships found for saturated conditions were consistent with measurements (Placencia‐Gómez and Slater, 2016; Revil et al, 2015a) and modeling (Gurin et al, 2015; Revil et al, 2015b; Wong, 1979) of porous media with conductive particles. In the case of unsaturated sand–biochar mixtures, the highly porous nature of biochar played an important role in understanding the experimental results.…”

Section: Discussionsupporting

confidence: 84%

Spectral Induced Polarization of Biochar in Variably Saturated Soil

Gao

Haegel

Esser

et al. 2019

Vadose Zone Journal

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Core Ideas Water retention and spectral induced polarization were measured for biochar in sand. Water retention curves could be fitted by using a dual porosity model. Residual water content was found to increase with the addition of biochar. The polarization of sand–biochar mixtures was much larger than that for sand. Spectral induced polarization may be suitable for monitoring biochar in the field. Biochar is considered a promising soil amendment, but an effective method to detect and characterize the spatial distribution and temporal dynamics of biochar in soil is still missing. The aim of this study is to investigate the ability of the spectral induced polarization (SIP) method for the noninvasive detection of biochar in unsaturated sandy media. In particular, a pure sand and two sand–biochar mixtures with 1 and 2% biochar made from pine (Pinus spp.) wood by pyrolysis at 800°C were investigated. The measured SIP spectra as a function of saturation were interpreted by fitting a Cole–Cole model to the low‐frequency part of the SIP measurements. The porous nature of the biochar particles strongly affected the SIP response of the partially saturated sand–biochar mixtures. Due to the high residual water content of the biochar in a dry background, the relationship between bulk electrical conductivity and water saturation was nonlinear in a log–log representation. This nonlinear behavior could adequately be explained with a dielectric mixing model that considered the drainage of the biochar particles. Both the measured phase and chargeability of the sand–biochar mixtures showed a complex dependence on water saturation. This was attributed to the decrease in polarization strength of the biochar particles with desaturation and the simultaneous increase in phase of the sand background. Overall, the results of this study suggest that field SIP measurements may be a promising tool for the characterization and monitoring of biochar amendments to agricultural soils.

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Section: Discussionsupporting

confidence: 84%

Spectral Induced Polarization of Biochar in Variably Saturated Soil

Gao

Haegel

Esser

et al. 2019

Vadose Zone Journal

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“…A range of studies have used SIP measurements to detect precipitation of a conductive mineral phase, − but relatively few studies have investigated the SIP response of calcite precipitation. − ,, These previous studies share the common limitation that the temporal development and spatial distribution of calcite precipitation was inaccessible due to the opaque nature of the porous media used in the column experiments. However, precipitation is a dynamic process which only occurs when the pore solution is oversaturated.…”

Section: Introductionmentioning

confidence: 99%

Pore-Scale Mechanisms for Spectral Induced Polarization of Calcite Precipitation Inferred from Geo-Electrical Millifluidics

Izumoto

Huisman

Zimmermann

et al. 2022

Environ. Sci. Technol.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Several models have been developed to describe how ions reversibly accumulate at the interface between pore fluid and metallic particles, causing polarization. Such models use either analytical equations for simple geometries (e.g., Misra et al, 2016;Placencia-Gómez & Slater, 2016;Revil et al, 2015;Wait, 1987;Wong, 1979) or numerical finite-element solutions to equations describing the physics involved (e.g., Abdulsamad et al, 2017;Bücker et al, 2018). Some of these models successfully predict the low-frequency (f ≤ 10 4 Hz) complex conductivity of synthetic samples containing disseminated metallic particles in an electrolyte (e.g., Abdulsamad et al, 2017;Revil et al, 2017;Wong, 1979).…”

Section: Introductionmentioning

confidence: 99%

Tracking Magmatic Hydrogen Sulfur Circulations Using Electrical Impedance: Complex Electrical Properties of Core Samples at the Krafla Volcano, Iceland

et al. 2019

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Interaction of H2S escaping from magma and basaltic rocks leads to pyrite mineralization, witnessing active hydrothermal circulation. We study the possibility to track this process using geoelectrical methods. Complex conductivity spectra of 30 core samples from the Krafla volcano, Iceland, measured in the laboratory, indicate that pyrite can be discriminated from other minerals present in volcanic environments, such as iron oxides and clays. Joint evaluation of the maximum phase angle of electrical impedance and its real part at low frequency is required. The volume of metallic particles (pyrite or iron oxides) can be estimated from the maximum phase angle, but a decrease of the maximum phase angle with increased fluid conductivity or smectite volume is also observed and needs to be considered in the estimation. The laboratory observations can guide interpretation of field observations for estimation of pyrite volume in volcanic environments.

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On the pore water chemistry effect on spectral induced polarization measurements in the presence of pyrite

Cited by 14 publications

References 51 publications

Spectral Induced Polarization of Biochar in Variably Saturated Soil

Spectral Induced Polarization of Biochar in Variably Saturated Soil

Pore-Scale Mechanisms for Spectral Induced Polarization of Calcite Precipitation Inferred from Geo-Electrical Millifluidics

Tracking Magmatic Hydrogen Sulfur Circulations Using Electrical Impedance: Complex Electrical Properties of Core Samples at the Krafla Volcano, Iceland

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