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

By J. Inczédy and I. Buzás (Auth.)

ISBN-10: 0080135455

ISBN-13: 9780080135458

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Extra resources for Analytical Applications of Ion Exchangers

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Furthermore, the fact should be taken into account that the ionic density is high in the modern ion-exchange 50 THEORY OF ION-EXCHANGE resin and the resin must be regarded as a concentrated solution. According to calculations for a moderately cross-hnked resin, 9 - 1 0 water molecules surround a potassium ion. This corresponds to a solution of about 6 M. In such a concentrated solution the interaction of ions also plays a considerable part. N o t only Coulomb forces exist between the ions but other polarisation, induction and London forces become predominant.

8. J. V. R. Smith, W. Robb and J. J. Jacobs, J. Inorg. , 1959, 1 2 , 104. 9. H. O. Phillips, F. Nelson and K. A. Kraus, ORNL, 1956, 2159, 37. 10. K. A. Kraus and H. O. Phillips, J. Amer. Chem. Soc, 1956, 7 8 , 249. 11. H. A. Sober and E. A. Peterson, / . Amer. Chem. Soc, 1954,76, 1711; 1956, 7 8 , 751. 12. J. D . Guthrie and A. L. Bullock, Ind. Eng. ,1960, 5 2 , 935; Analyt. , 1962, 9 , 1269. 13. G. Semenza, Helv. Chim. Acta, 1960, 4 3 , 1057. 14. N. V. Stamicarbon, Holl. Pat. 75705, 1954. 15. Directie van De Staatsmijnen in Limburg, Holl.

A Doman equilibrium occurs bet­ ween two electrolyte solutions separa­ κ, Η ted by a semi-permeable membrane if in one of the solutions is dissolved a salt, only one ion of which can per­ meate through the membrane. A diffu­ sion process is started by the difference FIG. 3. Gregorys model for in osmotic pressures caused by the con­ the thermodynamic treatment centration differences, until equiUbrium of selectivity of ion exchangers^* ionic concentrations are finally reached on both sides. Because of the unequal mobiUty of ions the concen­ tration distribution at equiUbrium is such that the tendency of ions to diffuse is in equiUbrium with the electrical field originating from the charges of the ions.

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