Desorption of cesium from granite under various aqueous conditions

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題名:	Desorption of cesium from granite under various aqueous conditions
作者:	Wang,TH;Li,MH;Wei,YY;Teng,SP
貢獻者:	水文與海洋科學研究所
關鍵詞:	SEQUENTIAL EXTRACTION PROCEDURE;SUBSURFACE SEDIMENTS;HANFORD SITE;SORPTION;SOILS;ADSORPTION;MINERALS;CS-137;USA;SPECIATION
日期:	2010
上傳時間:	2012-03-27 17:32:59 (UTC+8)
出版者:	國立中央大學
摘要:	In this work the desorption of cesium ions from crushed granite in synthetic groundwater (GW) and seawater (SW) was investigated. Results were compared with those obtained in deionized water (DW) and in two kinds of extraction solutions, namely: MgCl(2) and NaOAc (sodium acetate). In general, the desorption rate of Cs from crushed granite increased proportionally with initial Cs loadings. Also, amounts of desorbed Cs ions followed the tendency in the order SW > GW > NaOAc approximate to MgCl(2) > DW solutions. This indicated that the utilization of extraction reagents for ion exchange will underestimate the Cs desorption behavior. Fitting these experimental data by Langmuir model showed that these extraction reagents have reduced Cs uptake by more than 90%, while only less than 1% of adsorbed Cs ions are still observed in GW and SW solutions in comparison to those in DW. Further SEM/EDS mapping studies clearly demonstrate that these remaining adsorbed Cs ions are at the fracture areas of biotite. (C) 2010 Elsevier Ltd. All rights reserved.
關聯:	APPLIED RADIATION AND ISOTOPES
顯示於類別:	[水文與海洋科學研究所] 期刊論文

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