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    National Tsing Hua University Institutional Repository > 原子科學院  > 工程與系統科學系 > 會議論文  >  Cs diffusion in local Taiwan laterite with different solution concentration, pH and packing density

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/47151

    Title: Cs diffusion in local Taiwan laterite with different solution concentration, pH and packing density
    Authors: Tsing-Hai Wang;Ming-Hsu Li;Shi-Ping Teng
    教師: 鄧希平
    Date: 2008
    Publisher: Elsevier
    Relation: Applied Radiation and Isotopes, Elsevier, Volume 66, Issue 9, September 2008, Pages 1183-1189
    Keywords: adsorption
    nuclear chemical analysis
    radioactive chemical analysis
    radioactive pollution
    radioactive waste
    soil pollution
    Abstract: In this work we used an “in-diffusion” method to study the effects of pH, solution concentration and packing density on Cs diffusion by packing local Taiwan laterite (LTL) into modified capillary columns with 5 mm diameter. These packed columns were first pre-equilibrated with synthetic groundwater (GW) for 3 weeks. The diffusion experiments were then carried out at ambient condition for 2 weeks. Our experimental results showed that the Cs diffusion profile fits Fick's second law very well in given experimental conditions, indicating the validity of modified capillary column method. Generally speaking, Cs diffusion in LTL decreases as the pH increases and as Cs concentration decreases. The apparent diffusion coefficient (Da) increases from 5.52×10-12 (10-7 M) to 2.18×10-11 (10-3 M) m2/s, while the effective diffusion coefficient (De) shows slight variation as the Cs concentration changes. Both the derived Da and De values decrease as the pH increases, implying that the diffusion mechanisms of Cs nuclide in alkaline and acid environment are different. In addition, our results show that Cs diffusion is unaffected by the given packing density, indicating the interlaminary space is not the major determinant of Cs adsorption and diffusion in LTL.
    URI: http://www.elsevier.com/
    Appears in Collections:[工程與系統科學系] 會議論文

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