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Updated: Sep 30, 2026

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
Published on: June 6, 2018
Kinetics of isotopic exchange between strontium polymolybdate and strontium ions in aqueous solution
Gulten Atun1, Binay Bilgin, Ayben Kilislioglu
1Department of Chemistry, Faculty of Engineering, University of Istanbul, Avcilar-Istanbul, Turkey. gultena@istanbul.edu.tr
Abstract:
A heterogeneous isotopic exchange reaction of strontium polymolybdate in strontium chloride solution was studied using 90Sr as a tracer. The effects of low and high strontium chloride concentration on the rate and mechanism of the isotopic exchange reaction were investigated. It was found that, at high concentrations, the rate is independent of strontium concentration, but, at low concentrations, the rate is proportional to the strontium concentration. These results support a hypothesis that, at low concentrations, the rate is controlled by film diffusion, whereas at high concentrations it is controlled by particle diffusion. Experiments were performed at 293, 303 and 313 K. Activation energy of isotopic exchange reaction and thermodynamic parameters deltaH*, deltaS*, and deltaG* were calculated using the Arrhenius and Eyring equations. The results also indicated that recrystallization is a predominant factor in the present exchange reaction.
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