Filter Effect on Determination of Diffusion Coefficient for <sup>237</sup>Np(Ⅴ) in Opalinus Clay

WU Tao; LI Jin-ying

doi:10.7538/yzk.2010.44.09.1039

Atomic Energy Science and Technology > 2010 > 44(9): 1039-1042. > DOI: 10.7538/yzk.2010.44.09.1039

WU Tao, LI Jin-ying. Filter Effect on Determination of Diffusion Coefficient for ²³⁷Np(Ⅴ) in Opalinus Clay[J]. Atomic Energy Science and Technology, 2010, 44(9): 1039-1042. DOI: 10.7538/yzk.2010.44.09.1039

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Filter Effect on Determination of Diffusion Coefficient for ²³⁷Np(Ⅴ) in Opalinus Clay

WU Tao¹,
LI Jin-ying²

1.
Department of Chemistry, Huzhou Teachers College, Huzhou 313000, China
2.
Department of Planning, China National Nuclear Corporation, Beijing 100822, China

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Received Date: December 31, 1899
Revised Date: December 31, 1899

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Abstract

In-diffusion coupled with the abrasive peeling technique was employed in the study of diffusion behavior of the strong sorption radionuclide ²³⁷Np(Ⅴ) diffusion on Opalinus Clay. The stainless steel filter disc was used to confine the sample. It is very necessary to investigate the influence of the filter effect on the modeling. The diffusion parameters, such as effective diffusion coefficient D_e, distribution coefficient K_d and rock capacity factor α, were obtained by an in-house computer code to model the in-diffusion experiment results. Filter effect was considered in the computer code by introducing the effective diffusion coefficient D_feof ²³⁷Np(Ⅴ) in the filter. The results show that it is necessary to consider the filter effect. Moreover, Stokes-Einstein question can be used to design and optimization of in-diffusion experiments in which no experimental data D_feare available.
- filter effect,
- diffusion,
- ²³⁷Np(Ⅴ),
- Opalinus Clay

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Filter Effect on Determination of Diffusion Coefficient for 237Np(Ⅴ) in Opalinus Clay

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Filter Effect on Determination of Diffusion Coefficient for ²³⁷Np(Ⅴ) in Opalinus Clay