کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9793605 | 1514275 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The concentration and pH dependent diffusion of 137Cs in compacted bentonite by using capillary method
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
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چکیده انگلیسی
The 'in-diffusion' method was used to study the diffusion behavior of radionuclide 137Cs in compacted bentonite using a capillary. The results (distribution coefficient, Kd, apparent and effective diffusion coefficients, Da and De) derived from the capillary method are in good agreement with the literature data, and fit the Fick's second law very well. The experiments were carried out at 3.3Â ÃÂ 10â3 and 3.3Â ÃÂ 10â5mol/l cesium, pH 3-12, ionic strength 0.1Â M NaClO4, and at room temperature. The results suggest that the diffusion of cesium in compacted bentonite is dependent on solution concentrations and pH values. In agreement with the literatures, the Kd values derived from the capillary experiments are in most cases lower than those derived from batch experiments: the Kd values are about one-half to one-third the values of those from batch experiments. The interlaminary space plays a very important role to the sorption, diffusion and transport of Cs+ in compacted bentonite. The effective diffusion coefficient is higher than that of other nuclides in compacted bentonite, and the diffusion of cesium in compacted bentonite may be dominated by the surface diffusion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 345, Issues 2â3, 15 October 2005, Pages 184-191
Journal: Journal of Nuclear Materials - Volume 345, Issues 2â3, 15 October 2005, Pages 184-191
نویسندگان
Xiangke Wang, Xiaoli Tan, Changlun Chen, Lei Chen,