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- W2313594503 abstract "Products of hydrocarbon biodegradation are organic acids, CO2, and water. Organic acids and carbonic acids formed from CO2 enhance soil dissolution. Therefore, biodegradation results in enrichment of ions, increasing electrolyte concentration and changing fluid chemistry. Further, dissolution is expected to induce physical changes in the surface area of soil particles, potentially impacting their electrical response. To test the above hypothesis, induced polarization (IP) measurements in the frequency range (0.1-1000 Hz) were made on samples from an aged hydrocarbon contaminated site where intrinsic bioremediation occurs. Results from the saturated zone indicate that real conductivity (σ') is unable to distinguish contaminated from uncontaminated samples. However, using imaginary conductivity (σ), contaminated samples are distinguished from uncontaminated samples by their higher magnitudes. Further, the dissolved phase samples cluster in the intermediate σ, whereas residual phase samples show highest σ. Although σ' results from the unsaturated zone are complicated by variable soil moisture content, σ shows similar patterns as for the saturated zone. We infer from the strong response exhibited by residual phase samples that biodegradation is most active in this zone. Scanning electron microscope images from the depth interval of residual hydrocarbon phase samples show that this zone had extensive etching and pitting of quartz and feldspar grains. It is possible that etching and pitting results in an increase in the surface area of the mineral grains, producing the strong polarization observed for the residual phase samples. These results suggest that IP is potentially a better indicator of contamination and biodegradation than DC resistivity. However, more laboratory and field investigations are required to better understand the effect of biodegradation processes on the measured SIP response and the surface conduction mechanism." @default.
- W2313594503 created "2016-06-24" @default.
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- W2313594503 date "2003-01-01" @default.
- W2313594503 modified "2023-10-14" @default.
- W2313594503 title "Induced Polarization (Ip) Measurements Of Soils From An Aged Hydrocarbon Contaminated Site" @default.
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- W2313594503 doi "https://doi.org/10.3997/2214-4609-pdb.190.con04" @default.
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