The metal--ligand stability constants of uranyl ions with substituted o- hydroxyacetophenone oximes were determi-ned by the Bjerrum- Calvin pH titration technique. An aqueous dioxane medium containing 75% dioxane by volume and 0.1 M NaClO/sub 2/ was used. The linear relations between metal--ligand stability constants and proton-ligand stability constants were examined. (INIS)