Reactions of potassium and sodium

4.2.2. Reactions of potassium and sodium-rich feldspars
4.2.2.1. Reactions of other minerals
4.2.3. Experimental and modelling studies on mineral trapping
Table 5.
Fig. 5. Precipitation of dawsonite and kaolinite under different CO2 concentrations [95].Figure optionsDownload full-size imageDownload as PowerPoint slide
Conducting field-scale experiments is important to avoid the scaling-out effect in laboratory experiments. Such a study was conducted by in 2008, Mito et al. [30] on Nagaoka sandstone aquifer (the main ABT-737 are quartz, feldspar (58–96% of plagioclase), smectatite, mica, calcite, gypsum and pyrite). According to their field-scale study which checked the chemical composition of aquifer fluid before and after CO2 injection at 40, 60 and 120 m away from the injection well, there were an increased amounts of HCO3− (due to the dissolution of CO2), Ca, Mg, Fe, Al and Si concentrations in the aquifer fluid, mainly due to chlorite and plagioclase dissolution (Eq. (19)), which exhibits the initiation of considerable geochemical reactions from the initial stage of CO2 injection.equation(19)Chlorite+20H+(aq)→5Fe2+(aq)+5Mg2+(aq)+4Al(OH)3(aq)+6H4SiO4(aq)Chlorite+20H+(aq)→5Fe2+(aq)+5Mg2+(aq)+4Al(OH)3(aq)+6H4SiO4(aq)