Three cationic tracers, Sr2+, Co2+ and Cs+ were tested with a modified electromigration device by applying 2V, 3V 4V voltage gradients over an intact Grimsel granodiorite rock sample. An ideal plug-flow model advection-dispersion applied to analyze the breakthrough curves. Matrix characterization C-14-PMMA autoradiography scanning electron microscopy showed that in centimeter scale of rock, int...