某极低放废物处理场地下水中Sr迁移形式热力学分析  

Thermodynamic analysis of strontium's migration species in groundwater

作　　者：张东[1] 傅依备[1] 李宽良[2] 康厚军[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [2]成都理工大学环境工程学院,成都610059

出　　处：《安全与环境学报》2005年第2期34-36,共3页Journal of Safety and Environment

基　　金：中国工程物理研究院基金支持项目 (2 0 0 3 0 5 44 )

摘　　要：将化学热力学平衡分析模式与地球化学条件相结合,形成Sr元素水文地球化学迁移形式热力学分析方法体系。计算出某特定场址地下水中Sr的化学形态和迁移形式。结果表明,Sr2 + 迁移形式占总量的99.3 8% ,Sr HCO+ 3形式占0 .5 5 % ,Sr CO03占0 .0 19%。The present article gives the authors' experimentation measuration and thermodynamics analysis on the very low level waste (VLLW) from decommission. As a common practice, very low level waste (VLLW) from decommission is normally buried in a nearly place in conformity with the international rule. Unfortunately, such a way to dispose the waste may also lead to contamination of the nearby groundwater because the geochemical barrier is a new barrier to the contaminated nuclide's migration in the groundwater due to adding mineral additive according to the disadvantage factor of the rock and soil in site. As a result, the nuclides would be fixated into the rock and soil. Then, it is necessary to build up a theory of geochemical barrier to check the nuclides' behaviors in the groundwater, including the nuclide's chemical species and migration behavior in it. Such studies have great practical value in resolving the disposal of the radioactive waste in near place. Facing the problem, two ways exist to ascertain the chemical species and their deposition condition - experimentation measuration and thermodynamics analysis. However, it is highly probable to preserve the original water state during the experiment process. Our thermodynamics analysis is based on the physiochemical theory of aqueous solution. The method is very simple and economical in calculating and ascertaining the chemical species and deposition of elements in water. It was widely accepted that if the aqueous chemical condition of the certain site was acquired and the mode was correctly built, the actual needs will soon be satisfied. The thermodynamics analysis system of strontium's migrating was formed through combining the thermodynamics balance analysis mode and the geochemical condition. And, finally, the strontium's chemical species and migration species in groundwater of a certain place have been calculated. The result shows: Sr^(2+) 99.38%, SrHCO^+_3 0.55% and SrCO^0_3 0.019%.

关 键 词：环境工程 极低放废物处置 地下水 锶 化学形态 热力学分析 

分 类 号：X705[环境科学与工程—环境工程] O614.232[理学—无机化学]