Speaker
Description
Spectral induced polarization (SIP) exhibits unique sensitivity to pore-scale reactive processes. Calcium carbonate (CaCO3) precipitation, a critical reaction in carbon sequestration, soil stabilization, and environmental remediation, generates distinct SIP signals. In this study, a pore-realistic SIP simulation approach coupled with microfluidic experiments was employed to unravel the relationship between CaCO3 precipitation morphology and SIP responses. The electrical double layer polarization at the CaCO3-pore fluid interface was identified as the major polarization mechanism. Particle size of calcite governs the characteristic frequency of imaginary conductivity, while CaCO3 content and specific surface area jointly control its magnitude. During 0-6 pore volumes (PV) of calcite precipitation and aggregation, real conductivity declined from 3800 to 2700 μS/cm due to pore occlusion from CaCO3 precipitation walls. Between 0-4 PV, increasing particle size shifted the imaginary conductivity peak frequency from 500 to 300 Hz, while rising CaCO3 content elevated the peak magnitude from 30 to 40 μS/cm. At 4-6 PV, despite continued CaCO3 growth, reduced surface area drived a decline in imaginary conductivity from 40 to 20 μS/cm. above results provide mechanistic insights into pore-scale precipitation dynamics and demonstrate SIP’s quantitative, noninvasive advantage in monitoring pore-scale reactive processes.
| Country | China |
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