Reversibility of cadmium sorption to calcite revisited

► Cd2+ sorption/desorption to/from calcite studied at CO2-H2O-CaCO3 equilibrium. ► Cd2+ sorption to calcite is shown to be reversible. ► Sorption and desorption rates have same magnitude. ► The change in reaction kinetics with time is similar for sorption and desorption. ► Sorption reversibility may be linked to counter-ion density in the EDL.