Calculation and Application of UO_2's Eh in Groundwater
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摘要: 用Nernst方程计算了我国西南某核废物处置场地下水中U(Ⅵ)还原为UO2时的Eh值,并对影响Eh值的因素进行了讨论。结果表明,该处置场地下水中U(Ⅵ)以UO2沉淀的Eh值为(-0.177±0.011)V。U(Ⅵ)和配体CO32-浓度以及溶液pH等均对Eh值有明显影响。通过多种Ox-Red电对的Eh计算,可以检验地下水化学热力学模型的正确性。Abstract: The Eh for reduction of U(Ⅵ) to UO_2 in groundwater of a radioactive waste disposal site in the Southwest of China was calculated with Nernst equation,and the(various) factors influencing the Eh were discussed.The results show that the Eh for reduction of U(Ⅵ) to UO_2 in the groundwater is(-0.177±0.011) V,and the values are obviously affected by pH,concentrations of U(Ⅵ) and CO~(2-)_3.The thermodynamic(model) of groundwater could be judged by calculating Eh values of some Ox-Red.
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Keywords:
- groundwater ,
- Eh ,
- calculation ,
- U(Ⅵ) ,
- UO_2 ,
- reduction
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