The X-ray exposure process that produced reversible cycling of ion adsorption to a watervapor interface could be used to supply ions in controlled doses to either a liquid-vapor or a liquidliquid interface. Whether or not cycling will occur at a liquid-liquid interface would depend upon the behavior of the surfactant (or extractant) monolayer at the interface. If binding of ions to the surfactants (or extractants) leads them to extract ions into the second phase, then reversible cycling will not occur. However, if a surfactant monolayer remains at the interface upon ion binding, then reversible cycling can be expected at the liquid-liquid interface as well. In both cases, the observed effect of X-ray exposure can be used to controllably dose the interface with ions which could then subsequently trigger a range of interfacial effects, including metal ion extraction, catalysis, changes of interfacial phase or other properties.