The measurement of the diffusion coefficients of Pu(III) in hydrochloric acid by use of an analytical ultracentrifuge

Friehmelt, V.; He, Aiyong; Yang, Zechao; Marx, G.

doi:10.1016/s0020-1693(00)81761-2

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…This observation agrees well with previous results in comparable media and may be related to concurrent changes of ion hydration, solution structure, activity and viscosity [1][2][3][4]. These variations occur at concentrations lower than expected from the cross coefficients for ionic interactions I 1,2 (above ca.…”

Section: Diffusion Phenomenasupporting

confidence: 92%

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Ludwig¹,

Nguyen²,

Nabeshima³

2001

Radiochimica Acta

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Technetium / Extraction kinetics / Transfer coefficients / Ultracentrifuge / DiffusionSummary. The lack of published data on the extraction kinetics of Tc(VII) in the system U(VI)/HNO 3 //TBP/dodecane prompted us to investigate its transport behaviour in detail. The aim was to improve the U(VI)/Tc(VII) separation in the PUREX process. We choose the method of analytical ultracentrifugation to determine the concentration gradient profile, the initial flux density and the integral mass transport for both sides of the unstirred liquid-liquid interface as well as the overall mass transfer coefficients as a function of Tc(VII)-, U(VI)-concentrations and temperature from timedependent changes of the refractive index gradients. The results were supplemented by comparing the experimental with calculated concentration profiles, obtained by modeling a diffusion-limited extraction process. In some of the investigated systems, the transport at the interface is reaction-limited after phase contact. The determined values of J max , I, and α are discussed in terms of the extraction conditions.

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Section: Diffusion Phenomenasupporting

confidence: 92%

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Ludwig¹,

Nguyen²,

Nabeshima³

2001

Radiochimica Acta

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“…Limited data was collected at 7 M but was not deemed reliable enough to report here. This is unsurprising given the reported behavior of Pu(III); It is difficult to prevent the oxidation of Pu(III) in solutions above 5 M HNO 3 . Before complete breakdown of the reversible III/IV electrochemistry at 6–7 M HNO 3 , the ▵E p of the (III/IV) couple decreases with increasing acid.…”

Section: Resultsmentioning

confidence: 99%

Electrochemistry and Spectroelectrochemistry of the Pu (III/IV) and (IV/VI) Couples in Nitric Acid Systems

et al. 2017

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The solution chemistry of Pu in nitric acid is explored via electrochemistry and spectroelectrochemistry. By utilizing and comparing these techniques, an improved understanding of Pu behavior and its dependence on nitric acid concentration can be achieved. Here the Pu (III/IV) couple is characterized using cyclic voltammetry, square wave voltammetry, and a spectroelectrochemical Nernst step. Results indicate the formal reduction potential of the couple shifts negative with increasing acid concentration and reversible electrochemistry is no longer attainable above 6 M HNO3. Spectroelectrochemistry is also used to explore the irreversible oxidation of Pu(IV) to Pu(VI) and shine light on the mechanism and acid dependence of the redox reaction.

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ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(III) IN HYDROCHLORIC ACID BY USE OF AN ANALYTICAL ULTRACENTRIFUGE

Friehmelt¹,

He²,

Yang³

et al. 1985

Chemischer Informationsdienst

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The measurement of the diffusion coefficients of Pu(III) in hydrochloric acid by use of an analytical ultracentrifuge

Cited by 5 publications

References 6 publications

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Electrochemistry and Spectroelectrochemistry of the Pu (III/IV) and (IV/VI) Couples in Nitric Acid Systems

ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(III) IN HYDROCHLORIC ACID BY USE OF AN ANALYTICAL ULTRACENTRIFUGE

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The measurement of the diffusion coefficients of Pu(III) in hydrochloric acid by use of an analytical ultracentrifuge

Cited by 5 publications

References 6 publications

Determination of mass transfer coefficients of 99Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of 99Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Electrochemistry and Spectroelectrochemistry of the Pu (III/IV) and (IV/VI) Couples in Nitric Acid Systems

ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(III) IN HYDROCHLORIC ACID BY USE OF AN ANALYTICAL ULTRACENTRIFUGE

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Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation