Evaluation of the Static Permittivity of Aqueous Electrolytes

The static (relative) permittivity of aqueous electrolyte solutions at 25 A degrees C, epsilon(omega = 0) where omega is the frequency of the external field, has been obtained from the literature. The limiting dielectric decrements delta = - lim(c -> 0)d epsilon/dc, where c is the electrolyte concentration (a parts per thousand currency sign 1 mol center dot dm(-3)), are tabulated. The most appropriate additive individual ionic delta (i) values are derived. The effect of ion pairing in the solutions is briefly discussed.