Abstract
The composition and stability of the uranyl Chrome Azurol S chelate are reported. It was found that the reagent behaves as a colloidal electrolyte. Color formation was observed to be immediate and the absorbance values remained constant at least up to 72 hr. Continuous variation curves at 570 and 585 m mu confirmed the stoichtometry as one UO/sub 2/(II) to one Chrome Azurol S. The value of the apparent stability constant for the 1: 1 chelate at a pH of 5.0 and temperature of 30 deg C was 4.5 plus or minus 0.1 and 4.9 plus or minus 0.1 depending on the method. The corresponding free energy change of formation was - 6.2, 0.1 and -6.8 = 0.1 kcal, respectively, at 30 deg C. Suggestions are given as to the structure of the chelate. (P.C.H.)
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