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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  >  Adsorption of Se species on crushed granite: a direct linkage with its internal iron-related minerals


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/47154


    Title: Adsorption of Se species on crushed granite: a direct linkage with its internal iron-related minerals
    Authors: Yi-Lin Jan;Tsing-Hai Wang;Ming-Hsu Li;Shih-Chin Tsai;Yuan-Yaw Wei;Shi-Ping Teng
    教師: 鄧希平
    Date: 2008
    Publisher: Elsevier
    Relation: Applied Radiation and Isotopes, Elsevier, Volume 66, Issue 1, January 2008, Pages 14-23
    Keywords: adsorption
    crushing
    drilling
    drying
    scanning electron microscopy
    selenium
    X-ray diffraction
    Abstract: The adsorption of selenium species on crushed granite is investigated directly linking to its internal iron-related minerals. Experimental results demonstrated that granite has higher affinity toward Se(IV) adsorption than Se(VI) adsorption. Se(IV) adsorption on granite is insensitive to background electrolytes while the effect of ionic strength on Se(VI) adsorption is not observed, which is attributed to the overloading of Se(VI) ions. Results of chemical sequential extraction showed that the removal of crystalline iron oxides dramatically reduces Se(IV) adsorption, which corresponds to the disappearance of goethite signal within XRD pattern. Based on our results, it is proposed that goethite within granite dominates Se adsorption in crushed granite. Although these goethites probably stem from some sample preparation processes including drilling in situ, crushing, washing and drying granite samples in laboratory, the formation of goethite enhances the granite affinity toward Se species adsorption. Images of SEM/EDS furthermore revealed that goethite is embedded within the fractures. In addition, quantification by standard addition method by spiking goethite suspension indicates that only around 20% of goethite minerals are available during Se(IV) adsorption.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/47154
    Appears in Collections:[工程與系統科學系] 會議論文

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