[en] In the preceding papers on the complex equilibria between metal ions and aromatic o-hydroxycarboxylic acids, a report was presented on the equilibrium system of uranyl ions and 3-hydroxy-5,7-disulfo-2-naphthoic acid. The computer analysis showed that the data (obtained by means of emf titrations) were well explicable with two successive complexes. The present investigation was made to evaluate the formation of the U0₂²⁺ complexes of 3,5-disulfosalicyclic acid in 0.5 M NaCl0₄ solution at 25⁰C. In this case the computer analysis revealed the formation of more stable complexes: experimental details are given and discussed. (U.K.)