Specific Ion Interaction Theory SIT

In case of low charged species, and approximately below 3 mol kg 1 the Specific Ion interaction Theory (SIT) [29] can be applied for the calculations of activity coefficients. Data available on interaction coefficients are scarce. But, paradoxically for actinide ions such data are relatively well known. However, in certain cases, they can be estimated from the model developed by L. Ciaviatta [33,34],... 

Later modifications of this general approach became known as the specific-ion interaction theory (SIT) because of the explicit dependence... 

Bronsted-Guggenheim-Scatchard specific ion interaction theory (SIT) (cf. Grenthe and Wanner 1989 Giridhar and Langmuir 1991 Nordstrom and Munoz 1994) is an ion- and electrolyte-specific approach to activity coefficients, which is, therefore, theoretically capable of greater accuracy than the Davies equation. The general SIT equation for a single ion, i, can be written... 

The formation of the former direction is closely associated with the works of J.N. Bronsted, E.A. Guggenheim and G. Scatchard (1976), who in the 1920 s and 1930 s came up with the specific ion interaction theory. Based on this theory the Bronsted-Guggenheim-Scatchard model or specific ion interaction theory - SIT model was formed. It merges interaction of electrostatic and Coulomb forces of components in the solution in consideration of their individual properties. Laid in its basis were concepts of... 

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