A robust biamperometric titration methodology for the determination of uranium by Ti(III) reduction in the presence of plutonium

Nair, P.M.; Xavier, Mary

doi:10.1524/ract.2009.1623

Cited by 23 publications

(25 citation statements)

References 5 publications

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“…This effect results from the implosive collapse of acoustic bubbles in the vicinity of extended solid surfaces. 22,39 The additional reduction kinetics observed in the sonicated Pu solution may in consequence be attributed to the presence of Ti particles in solution in agreement with the following reaction scheme (23)- (24). The following depassivation and fragmentation of particles enhanced by the increase of mass transfer may favor solubilization.…”

Section: Papersupporting

confidence: 80%

Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

et al. 2015

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The behavior of Pu(iv) and Pu(iii) was investigated in aqueous nitric solutions under ultrasound irradiation (Ar, 20 kHz). In the absence of anti-nitrous reagents, ultrasound has no effect on Pu(iv), while Pu(iii) can be rapidly oxidized to Pu(iv) due to the autocatalytic formation of HNO(2) induced by HNO(3) sonolysis. In the presence of anti-nitrous reagents (sulfamic acid or hydrazinium nitrate), Pu(iv) can be sonochemically reduced to Pu(iii). The reduction follows a first order reaction law and leads to a steady state where Pu(iv) and Pu(iii) coexist in solution. The reduction process is attributed to the sonochemical generation of H(2)O(2) in solution. The kinetics attributed to the reduction of Pu(iv) are however higher than those related to the formation of H(2)O(2) which, after several hypotheses, is explained by the sonochemical erosion of the titanium-based sonotrode. Titanium particles thereby generated can be solubilized under ultrasound and generate Ti(iii) as an intermediate species, a strong reducing agent able to react with Pu(iv).

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Section: Papersupporting

confidence: 80%

Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

et al. 2015

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“…There are several destructive and non‐destructive techniques, e.g. Gamma‐ray spectrometry, X‐ray fluorescence (XRF) spectrometry, electroanalytical methods, K‐edge absorption spectroscopy, laser‐induced breakdown spectroscopy and so on, available for such analysis . XRF has many advantages over other techniques for such applications because it is versatile, fast and simple and does not require dissolution of the sample, which is very cumbersome for actinide oxides.…”

Section: Introductionmentioning

confidence: 99%

Betterment in EDXRF analytical results for compositional characterization of mixed uranium thorium oxide samples with bead specimens compared with pressed pellet specimens

2016

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A comparative study on the energy dispersive X‐ray fluorescence analytical results of uranium determinations, in uranium and uranium–thorium mixed oxides, using specimens in the form of fused beads and pressed pellets, has been made. It was observed that in case of fusion bead specimens, the intensity of the analyte lines was approximately 1.6 times of that observed in pellet specimens under identical instrumental conditions. In case of uranium oxide samples, the analytical results with bead specimens were slightly better compared with the pellet specimens. However, in case of the uranium–thorium oxide mixtures, the average precision obtained with bead specimen was significantly better (1%, 1 s) in comparison with that achieved using pellet specimens (7%, 1 s). This difference may be due to the hardness of thorium oxide compared with uranium oxide, which affects the homogeneity of the pellet specimens prepared. In fusion bead method of sample preparation, even highly refractory material like ThO2 forms uniform glass beads. Addition of internal standard further improves the analytical results, with reduction in the percent deviation of energy dispersive X‐ray fluorescence results from the expected values to 3% from 7% compared with that obtained using without internal standard. The fusion bead method of sample preparation will be very useful for characterization of sintered (U,Th)O2 pellets, which are highly refractory and difficult to dissolve. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Plutonium is determined by the redox titration method developed by J. L. Drummond and R. A. 12,14,16 However, those redox titrimetric methods mostly require separate exercise and reagents for the determination of U and Pu in the same sample. In this method, Pu(III) and Pu(IV) are oxidized to Pu(VI) by excess argentic oxide (AgO) in 1 M H 2 SO 4 solution followed by the destruction of excess AgO by sulphamic acid.…”

Section: Introductionmentioning

confidence: 99%