Thermodynamics of Np(IV) complexes with gluconic acid under alkaline conditions: sorption studies
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Henar Rojo
Abstract
The complexation of Np(IV) with gluconic acid (GLU) under alkaline conditions was investigated in the absence of Ca by carrying out a series of sorption experiments. The decrease of Np(IV) sorption on the sorbing material at increasing concentrations of GLU was interpreted as the formation of Np(IV)-GLU aqueous complexes. The modelling of experimental data according to the Schubert method [1] confirmed the formation of a complex with a Np : GLU ratio 1 : 1. The stoichiometry of the complex Np(OH)4GLU− was proposed based on the experimental observation that no proton exchange occurred during the course of the complexation reaction and that Np(OH)4(aq) was the predominant hydrolysis product in the absence of GLU. A log *β1,4,10 = −2.92 ± 0.30 for the formation reaction Np4+ + 4H2O + GLU−⇔Np(OH)4GLU− + 4H+ was calculated based on the conditional stability constants determined from sorption experiments and using the Np(IV) thermodynamic data selected in the NEA reviews [2].
Linear free energy relationships (LFER) confirmed that the stoichiometry and stability of the Np(IV)-GLU complex characterized in this work are consistent with data available for Th(IV)-, U(IV)- and Pu(IV)-GLU complexes.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Thermodynamics of Np(IV) complexes with gluconic acid under alkaline conditions: sorption studies
- Interaction of uranium(VI) with bioligands present in human biological fluids: the case study of urea and uric acid
- Approach to on-line monitoring of PUREX process using chemometric processing of the optical spectral data
- Development and demonstration of a new SANEX Partitioning Process for selective actinide(III)/lanthanide(III) separation using a mixture of CyMe4BTBP and TODGA
- Solid phase extraction of trivalent actinides and lanthanides using a novel CMPO-RTIL based chromatographic resin
- Stability studies of N,N,N´,N´-tetra-(2-ethylhexyl) dithiodiglycolamide (DTDGA)
- The effect of fluoride and silicate ions on the coprecipitation of gadolinium with calcium in phosphoric and sulpho-phosphoric media
- An electrochemical technique to prepare 55Fe source for the calibration of the X-ray detectors
- A novel and facile approach for the preparation of 133Ba source core, encapsulation and quality evaluation
