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Dehydration of irradiated and non-irradiated L-α-asparagine monohydrate

Part I. Isothermal kinetics

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Abstract

Dehydration of irradiated and non-irradiated asparagine monohydrate was investigated by means of a computer interfaced PerkinElmer 1B DSC in isothermal conditions and static atmosphere. Isothermal runs were performed at 358, 363, 368 and 373 K. Samples were γ-irradiated at room temperature, using a 137Cs source with an activity of 3·1013 Bq and a dose rate of 4·102 Gy h−1, with irradiation times between 8–116 h. Isothermal kinetics were analyzed via the common factorized rate equation. Šesták-Berggren conversion function was found to best fit the experimental data. Of the three fitting parameters, only the one associated with the activation energy was found to follow a coherent variation with the exposure time. Even within this simple model, that makes the activation energy a useful stability criterion within a set of similar samples.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest, Romania

    Ana Neacsu, I. Contineanu & V. T. Popa

  2. Bucharest University, Faculty of Chemistry, Bd. Regina Elisabeta nr. 4–12, Bucharest, Romania

    M. Contineanu

Authors
  1. Ana Neacsu
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  2. I. Contineanu
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  3. V. T. Popa
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  4. M. Contineanu
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Correspondence to Ana Neacsu.

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Neacsu, A., Contineanu, I., Popa, V.T. et al. Dehydration of irradiated and non-irradiated L-α-asparagine monohydrate. J Therm Anal Calorim 94, 405–410 (2008). https://doi.org/10.1007/s10973-008-9120-1

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  • DOI: https://doi.org/10.1007/s10973-008-9120-1

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