Comparative Study of Duolite A-378 and Duolite A-143 Anion Exchange Resins by Application of <SUP>131</SUP>I and <SUP>82</SUP> Br as a Tracer Isotopes

Abstract

In the present study radioactive tracer isotopes 131 I and 82 Br are applied to study the kinetics of iodide and bromide ion-isotopic exchange reactions in two anion exchange resins Duolite A-378 and Duolite A-143. The study is performed by varying the experimental parameters like temperature and concentration of exchanging mediu m to understand the effect of above parameters on exchange reaction rate (min -1 ), amount of ions exchanged (mmol), percentage of ions exchanged and distribution coefficient. For both the ion-isotopic exchange reactions it is common observation that the exchange reaction rate increases with increase in concentration and decreases with rise in temperature of exchanging med iu m. Also there exists a strong positive co-relationship between amount of ions exchanged and concentration of ionic solution, while a strong negative co-relationship exists between amounts of ions exchanged and temperature of exchanging mediu m. Co mparing the values of reaction rate (min -1 ), amount of ions exchanged (mmol); percentage of ions exchanged and distribution coefficient calculated for the two resins, it is observed that Duolite A-378 resins show superior performance than Duolite A-143 resins under identical operational parameters.