Triplet-ion interactions

The symbols have the same physical significance as those in Pitzer s previous papers (1,2,3,4,5), which are based on a different theoretical framework from that of Scatchard and use the ions of the mixed electrolytes as components. The 0mn (the doublet cation-cation interaction) represents the interactions between H+ and (Et)4N+, whereas mnx (the triplet ion interaction) indicates the interactions between H+, Br", and (Et)4N+. Thus, the quantities 0, 0, and are properties characteristic of the mixture, whereas By, BCY, and C are the properties of the single electrolyte solution, and are functions of the ionic strength. Equation 10 can be further reduced after imposing the conditions that Mnx = 0, 0 Mn = 0, and y2 (at the limit) = 0 ... 

In equations (15), (16) and (17), y is an adjustable parameter for each pair of anions or cations for each cation-cation and anion-anion pair, called triplet-ion-interaction parameter. The functions, 0 and 0 are fxmctions only of ionic strength and the electrolyte p>air type. Pitzer (1975) derived equations for calculating these effects, and Harvie and Weare (1981) summarized Pitzer s equations in a convenient form as following ... 

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