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Experiments for determining cerium isotope ion exchange rates with macrop-orous resins Amberlyst 15, D001 and XN1010 are discribed. The kinetics of the isotope ion exchange reaction has been examined by a simple theoretical equation of intraparticle effective diffusivity De in a porous ion exchanger. The ion exchange proceeds by diffusion within the macropores and the solid phase of the resin. De of cerium was affected by the concentration of the bulk solution C and was separated into a macropore diffusivity Dp and a solid phase diffusivity Dg by the equation. The diffusion coefficients of the exchanging ion are shown to have the values in the macropores comparable with those in the bulk solution and to have the values in the solid phase comparable with those in gel resin with the same crosslinkage as the resins used for the experiments.
Experiments for determining cerium isotope exchange exchange rates with macrop-orous resins Amberlyst 15, D001 and XN1010 are discribed. The kinetics of the isotope ion exchange reaction has been examined by a simple theoretical equation of intraparticle effective diffusivity De in a porous ion exchanger. ion exchange proceeds by diffusion within the macropores and the solid phase of the resin. De of cerium was affected by the concentration of the bulk solution C and was separated into a macropore diffusivity Dp and a solid phase diffusivity Dg by the equation. The diffusion coefficients of the exchanging ion are shown to have the values in the macropores comparable with those in the bulk solution and to have the values in the solid phase comparable with those in gel resins with the same crosslinkage as the resins used for the experiments.