The measurement of the diffusion coefficients of Pu(VI) in nitric acid solution with the aid of the analytical ultracentrifuge

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

doi:10.1016/s0020-1693(00)86314-8

Cited by 6 publications

(1 citation statement)

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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ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(VI) IN NITRIC ACID SOLUTION WITH THE AID OF THE ANALYTICAL ULTRACENTRIFUGE

Friehmelt¹,

He²,

Yang³

et al. 1985

Chemischer Informationsdienst

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Transport processes of actinides in aqueous and non-aqueous solutions

Marx

Gauglitz

Friehmelt

et al. 1986

Journal of the Less Common Metals

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The measurement of the diffusion coefficients of Pu(VI) in nitric acid solution with the aid of the analytical ultracentrifuge

Cited by 6 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

ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(VI) IN NITRIC ACID SOLUTION WITH THE AID OF THE ANALYTICAL ULTRACENTRIFUGE

Transport processes of actinides in aqueous and non-aqueous solutions

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The measurement of the diffusion coefficients of Pu(VI) in nitric acid solution with the aid of the analytical ultracentrifuge

Cited by 6 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

ChemInform Abstract: THE MEASUREMENT OF THE DIFFUSION COEFFICIENTS OF PLUTONIUM(VI) IN NITRIC ACID SOLUTION WITH THE AID OF THE ANALYTICAL ULTRACENTRIFUGE

Transport processes of actinides in aqueous and non-aqueous solutions

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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