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Spectrometric and morphological characterisation of condensed phase zirconium species produced during electrothermal heating on a graphite platform

Littlejohn, D. and Castro, M.A. and Aller, A.J. and McCabe, A.F. and Smith, W.E. (2005) Spectrometric and morphological characterisation of condensed phase zirconium species produced during electrothermal heating on a graphite platform. Journal of Analytical Atomic Spectrometry, 20. pp. 385-394. ISSN 0267-9477

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    Abstract

    Condensed phase zirconium species, produced over the temperature range 200–2500 °C, were analysed using scanning electron microscopy (SEM), energy dispersive (ED) X-ray spectrometry, attenuated total reflectance (ATR) Fourier transform infrared (FT-IR) spectrometry and Raman spectrometry. Very similar results were derived using pyrolytic and non-pyrolytic graphite platforms. Zirconia or zirconia mixed together with alumina in a solid solution were the predominant species on the platform surface up to about 1500 °C. The presence of alumina prevents conversion of the tetragonal phase of zirconia to the monoclinic phase, which is dominant for zirconia alone. Above 1500 °C, aluminium and zirconium follow independent thermochemical transformations; reduction of zirconia and alumina by graphite occurs, but aluminium species are volatilised, whereas some Zr metal remains on the surface after a full heating cycle at 2500 °C, provided that 100 μg of Zr is initially deposited on the platform. There was no evidence that zirconium carbide is formed to any significant extent and so chemical modification by Zr in ETAAS seems to involve the effects of zirconia or Zr metal on the analyte.

    Item type: Article
    ID code: 10151
    Keywords: analytical atomic spectrometry, Condensed phase zirconium species, electrothermal atomic absorption spectrometry , Chemistry
    Subjects: Science > Chemistry
    Department: Faculty of Science > Pure and Applied Chemistry
    Unknown Department
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      Depositing user: Strathprints Administrator
      Date Deposited: 30 Jun 2011 12:22
      Last modified: 12 Mar 2012 10:53
      URI: http://strathprints.strath.ac.uk/id/eprint/10151

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