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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 54, Iss. 1 — Jan. 1, 2000
  • pp: 99–105

Time-Resolved Laser-Induced Fluorescence of Uranium(VI) Hydroxo-Complexes at Different Temperatures

Veronique Eliet, Ingmar Grenthe, and Giovanni Bidoglio

Applied Spectroscopy, Vol. 54, Issue 1, pp. 99-105 (2000)


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Abstract

Fluorescence measurements were performed at different temperatures to increase the resolving capabilities of time-resolved laser-induced fluorescence for uranium speciation. This spectroscopic technique was used to determine the fluorescence lifetimes of the uranyl ion and the species UO2OH+, (UO2)2(OH)22+, and (UO2)3 (OH)+5 in 0.5 M NaClO4 solutions at different pH and total uranium concentration and in the temperature range from 10 to 60 °C. The temperature dependence of the lifetimes was found to follow the Arrhenius law, and the activation energy of the process was determined for each species. The influence of temperature on the equilibrium constants of the uranium hydroxo-complexes was also considered.

Citation
Veronique Eliet, Ingmar Grenthe, and Giovanni Bidoglio, "Time-Resolved Laser-Induced Fluorescence of Uranium(VI) Hydroxo-Complexes at Different Temperatures," Appl. Spectrosc. 54, 99-105 (2000)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-54-1-99


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