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Analytical Applications of Ion Exchangers by J. Inczédy and I. Buzás (Auth.)

By J. Inczédy and I. Buzás (Auth.)

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The selectivity coefficient is nearly identical for ion-exchange materials of the same type. 2. 1 45 EQUILIBRIUM SELECTIVITY COEFHCIENTS OF VARIOUS C A T O N S (COMPARED WITH THE HYDROGEN ION) ON DIFFERENTLY CROSS-LINKED DUOLITE C 20 STRONGLY ACIDIC RESINS® Ion H+ 4% DVB 8% DVB 12% DVB 16% DVB 10 10 10 10 Li + 0-9 0-85 0-81 0-74 Na+ 1-3 1-5 1-7 1-9 NHÍ 1-6 1-95 2-3 2-5 K+ 1-75 2-5 3-05 3-35 Rb+ 1-9 2-6 31 3-4 Cs+ 20 2-7 3-2 3-45 9-5 14-5 Cu + 3-2 5-3 Ag+ 60 7-6 Mn*+ 2-2 2-35 2-5 2-7 Mg«+ 2-4 2-5 2-6 2-8 2-4 2-55 2-7 2-9 12 17 Zn»+ 2-6 2-7 2-8 30 Co2+ 2-65 2-8 2-9 305 Cu2+ 2-7 2-9 31 3-6 Cd2+ 2-8 2-95 3-3 3-95 Ni*+ 2-85 30 31 3-25 Ca*+ 3-4 3-9 4-6 5-8 Sr«+ 3-85 4-95 6-25 Hg2+ 51 7-2 9-7 5-4 7-5 101 14-5 615 8-7 11-6 16-5 Pb«+ 8-1 14 Determination of selectivity coefficients should be carried out with great caution.

According to the above, the rate of exchange increases with increasing temperature. Similarly, the loose, less cross-linked resin structure is favourable to quicker diffusion or higher rate of exchange. In Chapter 3 further relations of the rate of exchange and the parts played by concentration of the solution and by the grain size of the resin are considered. 10. Chemical OF ΙΟΝ EXCHANGERS 35 resistance While most silicate-based ion exchangers can be used only over a very small pH range (6-7) the synthetic-resin base ion exchangers are generally stable in acidic and alkaline solution.

Benzene. The phenomenon that weakly acidic resins in the hydrogen-form are more swollen by the less polar ethanol than by water can also be explained by a coincidence of effects of opposing character. 5). 9. Operation rate of ion EXCHANGERS exchangers If an ion-exchange resin is immersed in an electrolyte solution, ionexchange takes place on the whole cross-section of the resin grains and equilibrium between the solution and the resin is reached within a measurable time. The natural zeolite exchangers have been found to operate slower and an ion exchanger of larger pores quicker than a common ionexchange resin.

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