The X-ray flourescence analysis induced by small radioisotopic sources has been employed for the study of the ion-exchange resins kinetics. The advantages offered by this technique over other commonly used methods are (a) variations in the concentration of ions in the resin-bead can be determined without sample taking; and (b) automatic measurements lasting a few seconds provide a check on process trends. The ions trapped in the resin-bead, in various zones of the column, can be expressed analytically, and the result is in good agreement with what can be deduced from a simplified model based on the hypothesis that the exchange process is controlled by diffusion of ions from solution to resin.
X-ray energy spectrometry: Application in the study of the ion-exchange kinetics / Cesareo, R.; Gigante, Giovanni Ettore. - In: INTERNATIONAL JOURNAL OF APPLIED RADIATION AND ISOTOPES. - ISSN 0020-708X. - STAMPA. - 28:3(1977), pp. 301-305. [10.1016/0020-708X(77)90078-3]