Abstract
Isotopic exchange of gallium between the gallium ion and its EDTA and EDTA-OH complexes is immeasurably slow in neutral solution and very fast in basic and strongly acid solutions. The rate is measurable in the pH regions near 8 and 1, and the rate constant for exchange is independent of the concentration of uncomplexed gallium and proportional to that of the complex. Near pH 8, the rate constant is proportional to the concentration of OH − ion, and the Arrhenius activation energy is ∼26 kcal mole −1 for both complexes. Below pH 1, the rate constant is proportional to [H +] 2·4 and the apparent Arrhenius activation energy is much smaller (∼15 kcal mole −1). It appears that the mechanism of exchange is different in these two pH regions, although it seems to be similar for both complexes under given conditions.
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