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A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly andGly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car-ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm<