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用高精度密度计测量了２５℃下 ＨＮＯ３－ＵＯ２（ＮＯ３）２， ＫＣＩ－Ｎａ２ＳＯ４和ＮａＣｌ－Ｎａ２ＳＯ４水溶液的密度从而求出了相应的表观摩尔体积；建立了用于混合电解质溶液密度关联的经验方程，用此方程对９个混合电解质水溶液体系的密度进行了关联，精度较高。另外，运用Ｐｉｔｚｅｒ理论，估算了不同温度下 ３９个单一电解质溶液的 Ｐｉｔｚｅｒ体积参数；用引入Ｐｉｔｚｅｒ体积混合参数与离子强度的关系式得到的方程对混合电解质水溶液的表观摩尔体积进行了计算，结果比较满意。
The density of HNO3-UO2 (NO3) 2, KCI-Na2SO4 and NaCl-Na2SO4 aqueous solutions was measured at 25 ° C using a high-precision densitometer to derive the corresponding apparent molar volumes. The experience of density correlation for mixed electrolyte solutions was established Equations, using this equation on the 9 mixed electrolyte aqueous system density has been associated with higher accuracy. In addition, Pitzer’s theory is used to estimate the Pitzer volumetric parameters of 39 single electrolyte solutions at different temperatures. The apparent molar volume of the mixed electrolyte aqueous solution is calculated by the equation derived from Pitzer’s relationship between the volume mixing parameters and ionic strength. The results Quite satisfied.