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《Environmental Protection Science》 2006-03
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Thermodynamic Analysis of the CO_2 Effects on the Stability of Calcium Arsenates

Solubility and stability of calcium arsenates under different CO_2 pressures are studied based on the data of precipitation and solution experiments simulated by PHREEQC program.The result shows that calcium arsenates can dissolve incongruently by the effect of CO_2 in high pH(pH8.3)and make their solubility higher.The higher the CO_2 pressure is,the lower the acidity of the incongruent dissolution is.The effects of CO_2 mainly occur on the 3∶2 and 5∶3 calcium arsenates,and less on the 4∶2 calcium arsenate.These conclusions can give some suggestions whether the CO_2 effects should be considered in calcium arsenates wastes disposal.
【Fund】: 国家自然科学基金(No.40263001);; 教育部科学技术研究重点项目(No.2003-77-03102);; 广西高校百名中青年学科带头人资助计划(No.2003-97)
【CateGory Index】: X703.1
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