The reactive and transport properties of soils and rocks in the subsurface and deep reservoirs can be mapped using electrical and electromagnetic methods such as the self-potential, electrical resistivity, and induced polarization. However, the interpretation of such measurements in terms of fluid content, mineralogy, and hydraulic and biogeochemical properties requires a clear understanding of the physico-chemical phenomena in the electrical double layer coating the pore surface. In this session, we propose to merge advances in biogeochemistry and physics to improve our understanding of the electrical response of porous media. A special emphasis is given to the development of surface complexation, kinetic, and solute transport models at the pore scale to improve the reactive transport models and the interpretation of the hydrogeophysical measurements. Multidisciplinary experimental, theoretical, and modelling contributions increasing our knowledge of the pore-scale chemical processes controlling the measurement at the laboratory or field scale are welcomed.