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<p>Using a fluoride ion selective electrode and multivariate regression analysis conducted with Matlab or Excel, the stability constants of Th(IV) and Al(III) fluorides were determined at 25&#xa0;°C and 0.01&#xa0;mol L<sup>−1</sup> (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> ionic strength. The results indicate that the overall stability constants for hydrogen fluoride complexes were <i>β</i><sub>1</sub> = 621.45 and <i>β</i><sub>2</sub> = 6.34 × 10<sup>3</sup>. For thorium fluoride complexes, they were <i>β</i><sub>1</sub> = 3.59 × 10<sup>5</sup>, <i>β</i><sub>2</sub> = 1.89 × 10<sup>10</sup>, <i>β</i><sub>3</sub> = 6.58 × 10<sup>14</sup>, and <i>β</i><sub>4</sub> = 1.42 × 10<sup>19</sup>, respectively. For aluminum fluoride complexes, they were <i>β</i><sub>1</sub> = 3.27 × 10<sup>5</sup>, <i>β</i><sub>2</sub> = 6.53 × 10<sup>10</sup>, <i>β</i><sub>3</sub> = 5.16 × 10<sup>14</sup>, <i>β</i><sub>4</sub> = 5.00 × 10<sup>17</sup>, and <i>β</i><sub>5</sub> = 2.18 × 10<sup>19</sup>, respectively.</p>

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Determination of stability constants of fluoride complexes of Th(IV) and Al(III) by potentiometry with ion selective electrode

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Jiaai Chen,
  • Junxin Liu,
  • Daqian Liu,
  • Min Huang,
  • Taoyuan Xiu,
  • Zhirong Liu

摘要

Using a fluoride ion selective electrode and multivariate regression analysis conducted with Matlab or Excel, the stability constants of Th(IV) and Al(III) fluorides were determined at 25 °C and 0.01 mol L−1 (NH4)2SO4 ionic strength. The results indicate that the overall stability constants for hydrogen fluoride complexes were β1 = 621.45 and β2 = 6.34 × 103. For thorium fluoride complexes, they were β1 = 3.59 × 105, β2 = 1.89 × 1010, β3 = 6.58 × 1014, and β4 = 1.42 × 1019, respectively. For aluminum fluoride complexes, they were β1 = 3.27 × 105, β2 = 6.53 × 1010, β3 = 5.16 × 1014, β4 = 5.00 × 1017, and β5 = 2.18 × 1019, respectively.