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中文摘要：
根据西南某极低放废物场址地下水的化学组分，运用PHREEQC软件研究了铀的化学形态，并讨论了pH、温度和pE（平衡状态下的电子活度）等条件对铀的化学形态的影响及变化规律．研究结果表明：当pH=7．6，温度T=12．2。C，pE=4时，该场址地下水中的铀主要呈现VI价，PA[UO2（CO3）2],【UO2（CO3）3],UO2CO3形式存在：温度和pH值对铀化学形态分布影响较大，而pE对其化学形态分布影响较小．因而，废物填埋和场址选择需重点考虑场址地下水的温度和pH．
英文摘要：
PHREEQC software was used to study the chemical form of uranium based on the chemical composition of groundwater from a low-level radioactive waste repository located in southwest China. The effects of pH, temperature, and pE （the equilibrium state of electronic activity） on the distribution in uranium chemical form were studied. The results show that uranium presents in the VI chemical valence and [UO2（CO3）2]2-, [UO2（CO3）3]4-, and UO2CO3 forms when pH=7.6, T=12.2 o C, and pE=4 in groundwater. Temperature and pH strongly impact the distribution of the uranium chemical form. However, pE has little effect on the chemical form distribution. Therefore, pH and groundwater temperature should be taken key considerations during the selection of waste landfill sites.
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