By J. Inczédy and I. Buzás (Auth.)
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Extra resources for Analytical Applications of Ion Exchangers
The nature of the counter ions in the solution may therefore falsify the measurements. For example, a resin previously saturated with hydrogen ions absorbs more sodium ions from sodium acetate solution, than from sodium chloride solution. 0 1-2 I03- 5-5 0-5 Formate 4-6 0-5 Acetate 3-2 0-5 Propionate 2-6 0-3 F- 1-6 0-3 HC03- that a multivalent ion is bound to a resin with only one valence and is therefore capable itself of binding counter ions (see Chapter 2). To describe the equihbrium of ionic concentrations in the ionexchange resin phase and in the solution phase in contact with it, the so-called distribution coefficient is also used: THEORY OF 47 SELECTIVITY It should be pointed out that different distribution coefficients are distinguished according to the units of the concentration of (B).
G. F. D'Alelio (Gen. Electric Co), USP 2340111, 1944. 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 P. Biacs and G. Nemeshegyi, unpublished work.
Anion-exchange resins are more sensitive to strong alkalies because of the lower power of resistance of the active groups. Some preparations having a less solid lattice (polyamines, polycondensates) can be dissolved on standing in strong alkalies for a long time. Therefore these are washed or regenerated not with sodium hydroxide solution but with aqueous ammonia or sodium carbonate solution. It is not advisable to bring together with alkah solution more concentrated than 1 Ν even the polymerisationtype preparations of better resistance to alkalies.
Analytical Applications of Ion Exchangers by J. Inczédy and I. Buzás (Auth.)