Journal of Radioanalytical and Nuclear Chemistry

, Volume 319, Issue 1, pp 401–407 | Cite as

Stability constants and spectroscopic properties of thorium(IV)-arsenazo III complexes in perchloric acid

  • Seonggyu Choi
  • Jong-Il YunEmail author


The complexation of thorium with arsenazo III in perchloric acid was quantitatively investigated with ultraviolet–visible (UV–Vis) absorption spectroscopy. The UV–Vis absorption of both 1:1 and 1:2 (thorium to arsenazo III) complexes in perchloric acid were found to be highly enhanced than the previously reported absorption of the complexes in hydrochloric acid. The stability constants of thorium-arsenazo III complexes were determined via computational analysis, and the SIT (specific ion interaction theory) was employed to evaluate the dependence on ionic strength. This work contributes to a better understanding of the speciation and spectroscopic properties of thorium-arsenazo III complexes at high ionic strength.


Thorium Arsenazo III Complexation Spectrophotometry Speciation SIT 



This work was supported by the BK21 PLUS program, and a grant from the Nuclear R&D Program of the National Research Foundation of Korea funded by the Ministry of Science and ICT (Grant Nos. 2016M2B2B1945252 and 2017M2A8A5014801).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Nuclear and Quantum EngineeringKAISTDaejeonRepublic of Korea

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