Abstract
The solubility of europium at 0.02M, 0.1M and 0.7M NaClO4 ionic strength solutions was determined by a radiometric method and pEus-pCH diagrams were obtained. Hydrolysis constants were also determined at the same ionic strengths by pH titration and the values found were log *β1 = -7.68±0.11, -8.07±0.10 and -8.20±0.11. The log K sp values were -23.5±0.2, -22.7±0.2 and -21.9±0.2 for 0.02M, 0.1M and 0.7M NaClO4 ionic strengths, respectively, at 303 K under CO2-free conditions and the extrapolated value at zero ionic strength was log K sp 0 = -24.15. The working pCH ranges for the calculation of the hydrolysis constants were selected from the pEus-pCH diagrams in the region where precipitation of europium oxide or hydroxide was less than 20%. Europium removal from aqueous solutions with zeolites was explored.
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Ramírez-García, J.J., Jiménez-Reyes, M., Solache-Ríos, M. et al. Solubility and first hidrolysis constants of europium at different ionic strength and 303 K. Journal of Radioanalytical and Nuclear Chemistry 257, 299–303 (2003). https://doi.org/10.1023/A:1024723527305
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DOI: https://doi.org/10.1023/A:1024723527305