Pitzer模型对Na^+｜｜CrO_4^(2-),HCO_3^--H_2O体系的溶解度计算与实验验证

Solubility of Na+｜｜CrO_4^(2-), HCO_3^--H_2O System by Three ParameterPitzer Model and Experimental Verification

利用三参数的Ｐｉｔｉｅｒ模型对２５℃下的Ｎａ＋｜｜ＣｒＯ２／４，ＨＣＯ３－Ｈ２Ｏ三元水盐体系溶解度进行了计算，计算值略低于实验值；当其中某一组份浓度较低时，计算值与实验值基本一致；当两组份浓度都较高时，计算值与实验值偏差较大；两组份共饱和时，铬酸钠浓度计算值比实验值低０．９％，碳酸氢钠浓度计算值比实验值低２２％，需用实验值修正．

The solubility in the Na+｜｜CrO2/4, HCO3-H2O system (25℃) was calculated by the Pitier model with three parameters. As compared to the experimental data, the calculated solubility is in good agreement with the data as the concentration of either compound in the system is low, and the calculated solubility are lower than the data as the concentration of two compounds (Na2CrO4, NaHCO3) are high. With two compounds co-saturating, the calculated solubility of Na2CrO4 is 0.9% less than the experimental value, the calculated solubility of NaHCO3 is 22% less than the experimental value.