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A computer program DISCOMP FORTRAN permits the drawing of distribution diagrams for different complexes as a function of the concentration of ligand, taking into account the continuous variation of ionic strength. The scope of the program has been limited to cases in which one metal and one ligand are involved, without protonated or hydrolysed species, but an attempt has been made to establish the program so that it can be adapted to each practical case. The first part of the study deals with the theory and general equations corresponding to the formation of complexes, and in the second the program is developed step by step. Because the changes in ionic strength are not negligible, stress has been laid upon their importance. It should be noted that the empirical coefficient C of the Debye-Hückel equation has to be determined to obtain better precision.