Improved Pitzer activity model for Tc(iv) solubility and hydrolysis in the Tc(iv)-Na<sup>+</sup>-K<sup>+</sup>-Ca<sup>2+</sup>-Mg<sup>2+</sup>-H<sup>+</sup>-Cl<sup>-</sup>-OH<sup>-</sup>-H<sub>2</sub>O(l) system.
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ABSTRACT: This study presents improved chemical, thermodynamic and Pitzer activity models for the system Tc(iv)-Na+-K+-Ca2+-Mg2+-H+-Cl--OH--H2O(l) in the context of the German Thermodynamic Reference Database (THEREDA, https://www.thereda.de). The work is based on (i) the previous THEREDA release No. 10 for Technetium in 2016, (ii) the data selection in the second update book of the Nuclear Energy Agency-Thermochemical Database (NEA-TDB) project and (iii) available new solubility studies in dilute to concentrated NaCl, KCl, CaCl2 and MgCl2 solutions. Updated chemical and thermodynamic models are evaluated to include the hydrolysis species Tc2O3 2+, TcO(OH)
SUBMITTER: Kiefer C
PROVIDER: S-EPMC12512013 | biostudies-literature | 2025 Oct
REPOSITORIES: biostudies-literature
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