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Thermal decomposition of uranyl nitrate hexahydrate

A thermal analysis—mass spectrometry study

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Abstract

TG-DTA-EGA studies have shown that anhydrous uranyl nitrate cannot be obtained by thermal decomposition of uranyl nitrate hexahydrate. Hydrolysis and polymerization of the salt during dehydration resulted in hydroxynitrates which decomposed in multiple steps with the evolution of oxides of nitrogen and water. The extent of hydrolysis dependend on the sample size, heating rate and nature of sample containment. Large samples on decomposition at relatively high heating rates showed evolution of nitric oxide even above 500°C. Infrared studies on the residues prepared at various temperatures supported the conclusions.

Zusammenfassung

TG-DTA-EGA-Untersuchungen erwiesen, daß wasserfreies Uranylnitrat nicht durch die thermische Zersetzung von Uranylnitrathexahydrat erhalten werden kann. Während der Dehydratation stattfindende Hydrolyse und Polymerisation des Salzes führen zu Hydroxynitraten, die sich in mehreren Schritten unter Freisetzung von Stickoxiden und Wasser zersetzen. Das Ausmaß der Hydrolyse hing von Probengröße, Aufheizgeschwindigkeit und Art der Probenkontrolle ab. Große Proben zeigten bei der Zersetzung bei relativ, hohen Aufheizgeschwindigkeiten die Freisetzung von Stickstoffmonoxid sogar oberhalb 500°C. Die Schlußfolgerungen wurden durch IR-Untersuchungen der bei verschiedenen Temperaturen erhaltenen Rückstände bestätigt.

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Authors and Affiliations

  1. Analytical Chemistry Division, Bhabha Atomic Research Centre, 400 085, Bombay, India

    K. V. Rajagopalan, P. V. Ravindran & T. P. Radhakrishnan

Authors
  1. K. V. Rajagopalan
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  2. P. V. Ravindran
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  3. T. P. Radhakrishnan
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Rajagopalan, K.V., Ravindran, P.V. & Radhakrishnan, T.P. Thermal decomposition of uranyl nitrate hexahydrate. Journal of Thermal Analysis 44, 89–96 (1995). https://doi.org/10.1007/BF02547137

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  • DOI: https://doi.org/10.1007/BF02547137

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