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Solubility and hydrolysis of lutetium at different [Lu3+]initial

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Abstract

Solubility product (Lu(OH)3(s)⇆Lu3++3OH−) and first hydrolysis (Lu3++H2O⇆Lu(OH)2++H+) constants were determined for an initial lutetium concentration range from 3.72·10−5 mol·dm−3 to 2.09·10−3 mol·dm−3. Measurements were made in 2 mol·dm−3 NaClO4 ionic strength, under CO2-free conditions and temperature was controlled at 303 K. Solubility diagrams (pLuaq vs. pC H) were determined by means of a radiochemical method using 177Lu. The pC H for the beginning of precipitation and solubility product constant were determined from these diagrams and both the first hydrolysis and solubility product constants were calculated by fitting the diagrams to the solubility equation. The pC H values of precipitation increases inversely to [Lu3+]initial and the values for the first hydrolysis and solubility product constants were log10 β* Lu,H = −7.92±0.07 and log10 K*sp,Lu(OH)3 = −23.37±0.14. Individual solubility values for pC H range between the beginning of precipitation and 8.5 were S Lu3+ = 3.5·10−7 mol·dm−3, S Lu(OH)2+ = 6.2·10−7 mol·dm−3, and then total solubility was 9.7·10−7 mol·dm−3.

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Authors and Affiliations

  1. Departamento de Quimica, Instituto Nacional de Investigaciones Nucleares, Apdo. Postal 18-1027, 11801, México, D.F., México

    H. López-González, M. Jiménez-Reyes & M. Solache-Ríos

  2. Departamento de Quimica, Área de Quimica Analitica, Universidad Autónoma Metropolitana, Apdo. Postal 55-534, 09340, México, D.F., México

    A. Rojas-Hernández

Authors
  1. H. López-González
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  2. M. Jiménez-Reyes
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  3. M. Solache-Ríos
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  4. A. Rojas-Hernández
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López-González, H., Jiménez-Reyes, M., Solache-Ríos, M. et al. Solubility and hydrolysis of lutetium at different [Lu3+]initial . J Radioanal Nucl Chem 274, 103–108 (2007). https://doi.org/10.1007/s10967-006-6910-4

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  • DOI: https://doi.org/10.1007/s10967-006-6910-4

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