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Effect of Beryllium Nitrate Vaporization on Surface Temperature in the Pyrocoated Graphite Furnace by D.A Katskov; R Mofolo; P Tittarelli is a Chemistry article available to read on EtoBox.
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The vaporization of 20᎐50 g beryllium from nitrate solution was observed in graphite furnace atomizers using Ž . pyrocoated and Ta-lined tubes. A charge coupled device CCD spectrometer was employed to follow the evolution Ž . of absorption spectra 200᎐475 nm , the light scattering and emission. Molecular bands of NO and NO were 2 observed below 1000ЊC. Beryllium absorption at 234.9 nm was prominent in spectra above 2200ЊC and 1900ЊC, respectively, in Ta-lined and pyrocoated tubes. The evolution profile of Be atomic absorption and of some bands indicated a faster vapor release in the pyrocoated tube. Light scattering occurred only in the pyrocoated tube, increasing with the tube age. When purge gas mini flow was applied, the scattering was observed at 1900᎐2200ЊC simultaneously with Be atomic absorption and emission continuum at long wavelength. The emission continuum showed the wavelength distribution characteristic of black body radiation. The temperature increase, due to the vaporization of the sample, was estimated using Planck's equation. The maximum temperature increase reached 400ЊC, when the most intense Be atomic absorption, light scattering and emission was observed. Accor
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- Author
- D.A Katskov; R Mofolo; P Tittarelli
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0584-8547)
- Published
- 1999
- Language
- EN
- Field
- Chemistry (Physical Sciences)