Abstract
The complexation of UO2 +2 and Th+4 ions with 2-mercaptoethanol has been studied by potentiometric and conductometric titration techniques. Uranyl ion forms 1∶1 and 1∶2 complexes in the pH-range 3.3–6.5 and thorium ion forms 1∶2, 1∶3, and 1∶4 complexes in the pH-range 3.2–4.8 with considerable overlapping. Their logk stab. values are determined at 10, 20, and 30°C at ionic strength μ=0.1M (NaClO4) by applyingCalvin-Melchior's extension of theBjerrum method. The overall changes in thermodynamic functions ΔG, ΔH, and ΔS accompanying complexation determined at 20°C are −19.48 kcal/mole, −22.77 kcal/mole, −11.23 cal/deg·mole for uranyl complexes and −33.94 kcal/mole, −4.93 kcal/mole, 99.00 kcal/deg·mole for thorium complexes, resp.
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Saxena, R.S., Khandelwal, G.L. Stabilities and thermodynamics of uranyl(II) and thorium(IV) complexes of 2-mercaptoethanol. Monatshefte für Chemie 108, 533–539 (1977). https://doi.org/10.1007/BF00912796
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DOI: https://doi.org/10.1007/BF00912796