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Abstract:The complexation equilibria of oximes including 1-phenyl-2-(quinodin-2-yl) ethanoneoxime (pqeo), 2-acetophenone oxime (apo) and 3-nitro benzaldoxime (nbo) with some transition and heavy metal ions such as Cu , UO 2 2+ and La 3+ were studied by potentiometric method in water-dioxane mixed solution. All of the titration steps were carried out at 25.0±0.1 ˚C and ionic strength (µ) of 0.1 M supported by KNO 3 . The overall stability constants logβ of respective species were evaluated by computer refinement of the corresponding potentiometric pH titration data using BEST computer program. The corresponding distribution diagrams were depicted as a function of pH by using HySS2009 program. The most likely species were obtained from distribution diagrams and the effect of the oximes structures on the stability constant values were investigated.