【摘要】 通过沉淀和溶解两方面的实验数据,应用PHREEQC程序模拟了砷酸钙在不同CO2分压条件下溶解度的变化情况,发现环境中的CO2可使砷酸钙盐在酸度较高(pH大于8.3)的条件下发生不一致溶解,使其溶解度升高;CO2分压越大,砷酸钙盐发生不一致溶解的酸度越低;CO2主要影响3∶2和5∶3的砷酸钙盐,而对4∶2砷酸钙盐的影响较小。这对不同类型砷酸钙盐废物的处置是否应考虑CO2的因素提供了依据。更多还原

【Abstract】 Solubility and stability of calcium arsenates under different CO₂ 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 CO₂ in high pH（pH>8.3）and make their solubility higher.The higher the CO₂ pressure is,the lower the acidity of the incongruent dissolution is.The effects of CO₂ 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 CO₂ effects should be considered in calcium arsenates wastes disposal.更多还原