【作者】 陈涛； 黎春； 刘晓宇； 王路化； 郑仲； 王祥云； 刘春立；

【Author】 CHEN Tao1,2,LI Chun2,LIU Xiao-yu2,WANG Lu-hua2,ZHENG Zhong2, WANG Xiang-yun2,LIU Chun-li2(1.School of Nuclear Science and Engineering,North China Electric Power University, Beijing 102206,China; 2.Beijing National Laboratory for Molecular Sciences,Department of Applied Chemistry, College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

【机构】 华北电力大学核科学与工程学院； 北京分子科学国家实验室北京大学化学与分子工程学院应用化学系；

【摘要】 129I是一重要的裂变产物,其在环境中的行为受到人们的重视。本工作利用脉冲柱法研究了125I(作为129I的替代物)在北山花岗岩中的迁移情况。实验结果表明,对流-水力学弥散是碘迁移的主要机制。碘的弥散系数D随流速的增加而增加,随淋洗液pH的增加而减小。D随pH的变化趋势与岩粉表面的电荷变化吻合。当流速为0.07mL.min-1、pH=8.0时,D=3.29×10-5 m2.min-1,和已有的实验结果相符,验证了弥散度只与介质有关这一结论。更多还原

【Abstract】 129I is an important fission product which is easy to be released into the environment by the nuclear power plants.Its movement in environment causes a lot of attention all around the world.In this work,the migration of 125I(as a substitute of 129I) in Beishan granite was studied by an inject-pulse column method.The results show that the dominant mechanisms of iodine migration are convection and dispersion.The dispersion coefficient(D) of iodine increases with the increase of the flow velocity or the decrease with pH.The change tendency of D with pH is coincide with the surface charge distribution of Beishan granite.D is 3.29×10-5 m2·min-1 when flow velocity is 0.07 mL·min-1 and pH is 8.0.This result verifies the conclusion that dispersion coefficient only relates to the migration media.更多还原