The effects of additions of Ag, Cr, Sb and P on the formation and growth of discontinuous precipitation (DP) reaction have been examined for different [001] symmetric tilt boundaries in a temperature range from 623 to 698 K using Cu 0.75 massBe alloy bicrystals. As the concentration of each element increases, the incubation period to initiate DP for a boundary increases, the cell growth rate for the boundary decreases, and both reach constant values. A detailed kinetic analysis of DP using the models by Turnbull and Petermann Hornbogen has enabled to determine the grain boundary diffusivity. At the stage in which the cell growth rate becomes a constant value, the activation energies Q b for boundary diffusion are in agreement with those Q v for bulk diffusion of the elements in Cu. For boundaries which have values of Q b lager than Q v before adding P, the boundary diffusivity is not affected by the P addition.