铀在西南某废物处置库土壤中的吸附迁移规律  

Research on Adsorption and Migration Patterns of Uranium in the Waste Repository Soil in the Southwest

作　　者：赖捷[1] 阳刚 冷阳春[1] 庹先国[2] 

机构地区：[1]西南科技大学国防科技学院,四川绵阳621010 [2]四川理工学院,四川自贡643000

出　　处：《西南科技大学学报》2017年第3期1-7,共7页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金重点项目(4163000426);四川省应用基础研究计划(2014JY0206);西南科技大学研究生创新基金(16ycx002)

摘　　要：以西南某低放废物处置库中的土壤为对象,开展铀在土壤中的吸附迁移实验。研究了时间、土壤粒径、温度、碳酸根、水相pH值、铀初始浓度对吸附的影响,结果表明:吸附平衡时间为15~20 d;粒径越小吸附比Kd值越大;温度对吸附无明显影响;吸附比随碳酸根浓度的增加而减小、随pH值增大而增大。铀在土壤中的吸附符合Freundlich吸附等温式。通过淋滤实验得到了铀在土壤中的迁移速度为7.3~8.5 cm·a^(-1)。This paper carries out the assay of uranium in the soil adsorption migration,based on the soil of a southwest low level radioactive waste repository. By studying the influence of time,soil particle size, temperature,carbonate ion,aqueous phase pH and initial concentration on the adsorption,it obtains that the adsorption equilibrium time is 15-20 days;the smaller the particle size,the greater the ratio of ad-sorption Kd;the temperature has no obvious effect on adsorption;adsorption ratio decreases with the con-centration of carbonate ion increasing and it increases with pH increasing. Uranium in the soil adsorption accords with the Freundlich adsorption isotherm. By conducting leaching experiments,it obtains that the migration speed of uranium in the soil is 7. 3-8. 5 cm·a-1 .

关 键 词：土壤 铀 吸附 核素迁移 

分 类 号：TL942.21[核科学技术—辐射防护及环境保护]