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Journal of Solution Chemistry

, Volume 46, Issue 6, pp 1272–1283 | Cite as

Stability Constants and Spectroscopic Properties of Thorium(IV)–Arsenazo III Complexes in Aqueous Hydrochloric Medium

  • Seonggyu Choi
  • Jun-Yeop Lee
  • Jong-Il YunEmail author
Article

Abstract

The complexation characteristics of thorium–arsenazo III in the range of 1–6 mol·L−1 hydrochloric acid media were investigated by UV–Vis absorption spectroscopy and computational analysis. The chemical equilibrium model of thorium–arsenazo III complexation was established including the species distribution of arsenazo III, the formation of thorium chloride species, and the release of protons from thorium–arsenazo III complexes. In the spectra of thorium–arsenazo III complexes, two characteristic absorption peaks were observed at 610 and 660 nm, and the latter peak showed a tendency to shift about 4 nm to higher wavelength as the acidity of the hydrochloric acid media increased from 1 to 6 mol·L−1. Analysis of the experimental data indicates that the molar absorptivities of both 1:1 and 1:2 complexes (thorium to arsenazo III) steadily increase as the acidity of medium increases. The determined stability constants of 1:1 and 1:2 complexes at various concentrations of hydrochloric acid were extrapolated to zero ionic strength, based on the specific ion interaction theory (SIT) approach. The limiting stability constants were determined to be \( { \log }_{10} \beta_{11}^{\text{o}} \) = 8.56 ± 0.13 and \( {\log}_{10} \beta_{12}^{\text{o}} \) = 15.17 ± 0.18 with ion interaction coefficients of Δε 11 = –0.57 ± 0.02 kg·mol−1 and Δε 12 = –0.60 ± 0.04 kg·mol−1, respectively.

Keywords

Thorium Arsenazo III Stability constant Ion interaction coefficient Spectrophotometry Computational analysis 

Notes

Acknowledgement

This work was supported by the BK21 PLUS program, Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2016R1A5A1013919), and the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KOFONS), and granted financial resource from the Nuclear Safety and Security Commission (NSSC), Republic of Korea (No. 1305032).

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Department of Nuclear and Quantum EngineeringKAISTDaejeonRepublic of Korea
  2. 2.Institute for Nuclear Waste Disposal, Karlsruhe Institute of TechnologyKarlsruheGermany

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