Comparative Study on Bromide and Iodide Ion-Isotopic Exchange Reactions Using Strongly Basic Anion Exchange Resin Duolite A-113

Abstract

Kinetics of ion-isotopic exchange reaction was studied using industrial grade ion exchange resin Duolite A-113. The radioactive isotopes I and Br were used to trace the ion-isotopic exchange reaction. The experiments were performed in the temperature range of 26.0•Ž to 43.0•Ž and the concentration of external ionic solution varying from 0.005 M to 0.100 M. For bromide ion-isotopic exchange reaction, the calculated values of specific reaction rate, initial rate of bromide ion exchange, and amount of bromide ions exchanged were obtained higher than that for iodide ion-isotopic exchange reaction under identical experimental conditions. The observed variation in the results for two ion-isotopic exchange reactions was due to the difference in the ionic size of bromide and iodide ions.

Radio Analytical Nondestructive Technique in Performance Evaluation of Organic Base Ion Exchange Resins Purolite NRW-6000 and Duolite A-378

“…Preliminary studies show that the above exchange reactions are of first order [14][15][16][17][18]. Therefore logarithm of activity when plotted against time gives a composite curve in which the activity initially decreases sharply and thereafter very slowly giving nearly straight line (Figure 1), evidently rapid and slow ion-isotopic exchange reactions were occurring simultaneously [14][15][16][17][18]. Now the straight line was extrapolated back to zero time.…”

“…The activity of solution was measured at a fixed interval of every 2.0 min. The final activity (A f ) of the solution was also measured after 3h which was sufficient time to attain the equilibrium [14][15][16][17][18]23,24]. The activity measured at various time intervals was corrected for background counts.…”

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

“…Fro m the results, it appears that iodide ions exchange at the faster rate as co mpared to that of bro mide ions which was related to the extent of solvation (Tables 3 and 4). [30] in the study of chloride distribution coefficient on strongly basic anion exchange resin observed that the selectivity coefficient between halide ions increased at higher electro lyte concentrations. Adachi et al [31] observed that the swelling pressure of the resin decreased at higher solute concentrations resulting in larger K d values.…”

Radio analytical technique in characterization of nuclear grade ion exchangers Duolite ARA-9366B and Purolite NRW-5010

“…The activity of solution was measured at a fixed interval of every 2.0 min. The final activity (A f ) of the solution was also measured after 3 h which was sufficient time to attain the equilibrium (Singare et al 2012;Lokhande et al 2007;Lokhande et al 2008a;Lokhande and Singare 2008;Lokhande et al 2006). The activity measured at various time intervals was corrected for background counts.…”