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Solvent extraction and radiotracer techniques have been applied to the study of metaltartrate ion association in water a t 25' C. Trace concentrations of the radioisotopes TbleO and E u~~~'~~~ were equilibrated between aqueous sodium tartrate solutions and organic phases of thenoyltrifluoroacetone in toluene. The ionic strength (0.0597) and the pH (4.53) of the aqueous phase were kept constant b y means of sodium perchlorate and sodium acetate.Metal complexing with the d-, dl-, and meso isomers of the ligand was examined. For all isomers two complex species were identified with meta1:ligand ratios of 1 : l and 1:2, and stability constants for both stages of ion association have been estimated. No third (1:s) complex was detected.Metal coordination numbers and the formation of tartrate-tartrate hydrogen bridges in the 1:2 complex are discussed.