Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 2 No. 4 November 1992|
（1.Shenzhen Uninversity, Shenzhen 518060, China;
2.Qinghua University, Being 100084, China;
3.Central South University of Technology, Changsha 410083, China）
Abstract:A new expression for the osmotic and activity coefFcients in single electrolyte solution is developed by reforming the Pitzer's osmotic equation. As a result, the correlations between the aMx, the sum of the " hard core" radii of ions M+ and X-, and the second virial coefficients βMX(0) and βMX(1) in Pitzer's equations are obtained.Furthermore, an "ionic overlap" model and its relevant equation are suggested. The relationships between the thermodynamic properties of aqueous electrolytes and the characteristic of their ions (ionic radii and ionic hydration) are discussed quantitatively.
Key words: Pitzer virial parameter osmotic coefficient activity coefficient electrolytic solution ionic radius