Geologic sequestration (GS), particularly deep saline aquifers, can store vast amounts of CO2, curtailing climate change. This work aims to understand the consequences of potential leakage from GS sites, specifically the effect of dissolved CO2 and salts on groundwater quality when PbS (galena) is ubiquitous. High concentrations of CO2 and salts induce the dissolution and precipitation of galena. Saturated (PCO2=1 atm) and unsaturated CO2 solutions were prepared with varying ionic strengths. Simulated systems for a continuous CO2 leakage and one-time leakage are investigated by monitoring dissolution rates of galena using inductively coupled plasma mass spectrometry. In-situ and ex-situ AFM experiments were run on (111) and (100) surfaces of galena. XRD analysis was used to identify secondary mineral phases. Different planes of galena indicated a clear difference in dissolution rates. These results provide fundamental information on the reactivities of galena with CO2 and help to understand potential effects of CO2 leakage.

Surface reactions of galena in the presence of leakages from geologic sequestration: CO<sub>2</sub>-H<sub>2</sub>O-PbS interactions

239th National Meeting (2010)

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Surface reactions of galena in the presence of leakages from geologic sequestration: CO2-H2O-PbS interactions

Surface reactions of galena in the presence of leakages from geologic sequestration: CO₂-H₂O-PbS interactions