The zeta potential of quartz. Surface complexation modelling to elucidate high salinity measurements

The zeta potential is a measureable electrical of paramount importance to understand the electrochemical properties rocks. However, remains poorly understood because it takes place at nanoscale double layer on mineral surface. Streaming measurements quartz-rich Fontainebleau and Lochaline sandstones carried out high salinity (above 0.1 M NaCl) yield surprisingly values, which cannot be correctly reproduced by traditional surface complexation model considering that shear plane located beginning diffuse layer. We found placing plane, where defined, slightly closer than Stern significantly improves predictions charge density quartz as well values equilibrium constant describing sodium adsorption in Our results have strong implications for modelling minerals contact with highly saline solutions.