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By J. Inczédy and I. Buzás (Auth.)

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On the degree of ion pair formation. An ion exchanger absorbs much more the ion, the ion pair corresponding to which has a lower dissociation constant. The selectivity is higher for Β ion if Α Γ α κ > ATbr. It follows from the equation that the selectivity coefficient for Β ion increases with decreasing [B]/[A] concentration ratio, at a constant value of Cry irrespective of the relative value of the dissociation constants. ), is decreased. Because the degree of formation of ion pairs also depends on the degree of interaction of ionic groups near each other on an ion-exchange resin, the select­ ivity is higher if the resin is more cross-linked, if its capacity is higher and if the solution in contact with the resin is dilute.

The form and size distribution of the pores or channels can vary greatly, depending on the preparation. Pores of siHcate-based ion exchangers having a stiff and crystalline structure are of uniform size and they are directed; pores of ionexchange resins are of variable size even for the same resin product and the direction of the channels is particularly zigzag. The size of the pores plays an important role in the selectivity of ion exchangers, because materials having small pores are only suitable for reception of ions of a certain size; they do not absorb ions or molecules of greater size (sieve effect).

34. C. H. McBurney (Rohm and Haas Co), USP 2591573, 1932. 35. K. W. Pepper, H. M. Paisley and M. A. Young, / . Chem. Soc (London), 1953, 4097. 36. W. C. Bauman and R. McKellar (Dow Chem. ), USP 2614099, 1952. 37. Ion Exchange and its Application, Ed. Chmutov, Akad. Nauk USSR, Moscow, 1959. 38. Researches in the Fields of Ion-Exchange, Partition and Precipitation Chromatography, Akad. Nauk USSR, Moscow, 1959. 39. P. Biacs and G. Nemeshegyi, unpublished work. Technical Univ. Budapest, 1960. 40. J, I.

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