125Ⅰ在压实北山花岗岩粉中毛细管内扩散

为了解129Ⅰ在我国深地质处置库重点研究区围岩中的迁移行为,为选址预评价提供基础数据,利用批式吸附实验法和改进的毛细管内扩散法研究了碘离子在北山花岗岩粉中的吸附和扩散行为,分析了不同控制条件对碘离子的表观扩散系数（Da）的影响。结果表明：在固液比为20g/L,碘离子在北山花岗岩粉上的吸附几乎可以忽略;扩散实验中125Ⅰ-的Da值为8.2×10（-11）1.4×10（-9）m2/s,表明碘离子在压实北山花岗岩岩粉中的扩散速率很快;~125Ⅰ-的Da值随扩散温度的升高而变大,随扩散源液离子强度的增加而变大,随同位素载体浓度的升高而变大,125Ⅰ-的扩散速率随溶液pH值的上升整体有减小的趋势。...

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Published in核化学与放射化学 Vol. 37; no. 6; pp. 469 - 475
Main Author 张伟华 马宾 何建刚 彭道锋 王祥云 刘春立
Format Journal Article
LanguageChinese
Published 北京分子科学国家实验室，放射化学与辐射化学重点学科实验室，北京大学 化学与分子工程学院，北京 100871%东华理工大学 化学生物与材料科学学院,江西 南昌,330013 2015
Subjects
北山花岗岩
扩散
毛细管内扩散法
Beishan granite
diffusion
扩散
129I
北山花岗岩
毛细管内扩散法
1 2 9 I
capillary in-diffusion method
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ISSN0253-9950
DOI10.7538/hhx.2015.37.06.0469

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Summary:为了解129Ⅰ在我国深地质处置库重点研究区围岩中的迁移行为,为选址预评价提供基础数据,利用批式吸附实验法和改进的毛细管内扩散法研究了碘离子在北山花岗岩粉中的吸附和扩散行为,分析了不同控制条件对碘离子的表观扩散系数（Da）的影响。结果表明：在固液比为20g/L,碘离子在北山花岗岩粉上的吸附几乎可以忽略;扩散实验中125Ⅰ-的Da值为8.2×10（-11）1.4×10（-9）m2/s,表明碘离子在压实北山花岗岩岩粉中的扩散速率很快;~125Ⅰ-的Da值随扩散温度的升高而变大,随扩散源液离子强度的增加而变大,随同位素载体浓度的升高而变大,125Ⅰ-的扩散速率随溶液pH值的上升整体有减小的趋势。
Bibliography:diffusion; Beishan granite; 129 I; capillary in-diffusion method
In order to understand the migration behavior of 129I in the host rock of China＇s key potential deep geological repository, and to provide basic data for the pre-safety assess- ment of the site, the effect of different experimental conditions on the adsorption and diffu- sion of iodine ion was investigated using a batch sorption method and a modified capillary in- diffusion method. The results suggest that the adsorption of iodide onto Beishan granite is almost negligible under solid/liquid ratio of as high as 20 g/L. According to the capillary experimental results, Da values of 125I- are between 8.2×10~（-11） and 1.4×10-9 m2/s, which suggests that the diffusion rate of iodide ion in compacted Beishan granite powder is very high. There is a positive correlation between the Da with temperature, isotopic carrier con- centration and ionic strength, which can be explained by Brownian motion and electrieai double layer structure of granite surface. Whi
ISSN:0253-9950
DOI:10.7538/hhx.2015.37.06.0469