Conference Proceedings Paper
INTERACTION OF NPO2+ WITH CL- IN NA-CA-CL TYPE SOLUTIONS WITH HIGH IONIC STRENGTH
37th Annual CNS Conference - 2017 June 04-07
S. Nagasaki (McMaster University)
T. Saito (The University of Tokyo)
S. Tsushima (HZDR)
J. Goguen (McMaster University)
T. Yang (NWMO)
The interaction of NpO2+ with Cl- was studied using UV-Vis spectroscopy in the NaCl-CaCl2-NaClO4, NaCl-NaClO4 and CaCl2-NaClO4 solutions with ionic strength (I) of 6 M. The spectra of NpO2+ around 980 nm varied with Cl- concentration in the NaCl-CaCl2-NaClO4 and NaCl-NaClO4 solutions at [Cl-] ≥ 3.5 M, but not in the CaCl2-NaClO4 solution. Assuming the 1:1 interaction between NpO2+ and Cl-, the apparent equilibrium constants at I = 6 M were evaluated. The apparent equilibrium constant in the NaCl-CaCl2-NaClO4 solution was found to be smaller than that in the NaCl-NaClO4 solution. The observations were consistent with the density functional theory calculation.
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