Spectroscopic study on the mononuclear hydrolysis species of Pu(VI) under oxidation conditions
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Hye-Ryun Cho
Abstract
The formation constants of mononuclear hydrolysis species of Pu(VI) were determined by absorption spectroscopy under carefully designed experimental conditions. In order to exclude the formation of polynuclear hydrolysis species, the concentration of plutonium was diluted below 50 μM. To maintain the oxidation state of Pu(VI), NaOCl was applied as an oxidant. The trace amount of Pu(V) was monitored by the measurement of redox potential and absorption spectroscopy by using a liquid waveguide capillary cell with the optical path length of 100 cm. The determined molar absorption coefficients (ε, M−1 cm−1) were 272±26 and 436±33 for PuO2(OH)+ and PuO2(OH)2(aq) species, respectively. The formation constants of mononuclear hydrolysis species of Pu(VI) at ionic strength of 0.01 M NaClO4 were determined as follows:
logߙ*β′1 ߙ(for PuO2(OH)+) = −5.8±0.3,
logߙ*β′2 ߙ(for PuO2(OH)2(aq)) = −13.4±0.2
and
logߙ*β′3ߙ(for PuO2(OH)3−) = −24.3±0.8.
© by Oldenbourg Wissenschaftsverlag, Daejeon, Germany
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Artikel in diesem Heft
- New cross section measurements for the production of the Auger electron emitters 77Br and 80mBr
- Development of a SISAK extraction system for chemical studies of element 108, hassium
- Spectroscopic study on the mononuclear hydrolysis species of Pu(VI) under oxidation conditions
- Origin assessment of uranium ore concentrates based on their rare-earth elemental impurity pattern
- Performance of the mesh-type liquid cadmium cathode structure for the electrodeposition of uranium from the molten salt
- Temperature effect on U(VI) sorption onto Na-bentonite
- Rapid separation method for actinides in emergency soil samples
- Effect of solvent on the extraction of lanthanides with picrolonic acid
- Separation and purification of no-carrier-added arsenic from bulk amounts of germanium for use in radiopharmaceutical labelling
- Labelling and optimization of PHOTOFRIN® with 99mTc
- Appreciation to Referees