核素铀、镅在地下水中赋存形态模拟  

Speciation of Nuclides U and Am in Groundwater Based on PHREEQC

作　　者：黄淑龙 张金 毛亮[1] 李洪辉[1] 张冰焘 武海花 孟子贺 HUANG Shulong;ZHANG Jin;MAO Liang;LI Honghui;ZHANG Bingtao;WU Haihua;MENG Zihe(China Institute for Radiation Protection,Taiyuan,Shanxi 030006,China;CNNC Qinshan Nuclear Power Co.Ltd,Jiaxing,Zhejiang 314300,China)

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]秦山核电有限公司,浙江嘉兴314300

出　　处：《世界核地质科学》2022年第2期254-261,共8页World Nuclear Geoscience

摘　　要：核素在地下水中的赋存形态对其迁移扩散能力有一定影响。为探究核素在黏土岩区域地下水中的赋存形态,以内蒙古阿拉善地区某黏土岩预选场址地下水为介质,采用PHREEQC软件并结合OECD/NEA发布的最新热力学数据库计算了核素铀、镅在地下水中的赋存形态,并分析了pH对核素赋存形态的影响。结果表明:内蒙古阿拉善地区地下水中铀主要以Ca_(2)UO_(2)(CO_(3))_(3)和CaUO_(2)(CO_(3))_(3)^(2-)形式存在,镅主要以Am(CO_(3))^(+)形式存在;pH会对核素赋存形态有重要影响,核素发生的络合反应类型会随着pH的变化而改变,进而生成不同的络合物。Nuclide species in groundwater have a significant influence on their ability to migrate and diffuse.The nuclide species in groundwater of argillaceous rock area,and the effects of the potential pH on the species were investigated by using PHREEQC codes based on the lasted thermodynamic database published by the Nuclear Energy Agency of Organization for Economic Co-operation and Development(OECD/NEA).The results show that Ca_(2)UO_(2)(CO_(3))_(3) and CaUO_(2)(CO_(3))_(3)^(2-)are the major species of uranium and Am(CO_(3))^(+)is the major species of americium in the groundwater of argillaceous rock area in Alashan of Inner Mongolia,China.The value of pH has an important influence on nuclide species.The type of complex reaction between nuclides and ions in groundwater solution will change with the change of pH,and then different complexes will be formed.

关 键 词：核素铀 核素镅 PHREEQC 地质处置 地下水 

分 类 号：TL942[核科学技术—辐射防护及环境保护] X946[环境科学与工程—安全科学]