Effect of Cation Chloride Concentration on the Dissolution Rates of Basaltic Glass and Labradorite: Application to Subsurface Carbon Storage

The steady-state dissolution rates of basaltic glass and labradorite were measured in the presence 10 to 700 × 10−3 mol·kg−1 aqueous NaCl, KCl, CaCl2, MgCl2 at 25 °C. All mixed flow reactors, pH~3.6 by addition HCl reactive fluids. rates, based on Si release, increased ~0.3 log units either CaCl2 or compared their NaCl KCl. In contrast, decreased ~0.4 These contrasting behaviours likely reflect varying effects these cations stability rate controlling Si-rich activated complexes surface dissolving solids. On average, release solids are similar each other increase slightly with increasing ionic strength. As pH water charged 30 bars CO2 is ~3.6, results this study indicate that both will be effective adding Ca phase saline This observation supports potential efforts store carbon through its mineralization aquifers containing Ca-bearing feldspar submarine basalts.