Atomization Mechanisms of Gold Dispersed on Pyrolytic Graphite Surface in Graphite Furnace Atomic Absorption Spectrometry

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  • Nakamura Kazushi
    Department of Chemistry, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Tayama Masami
    Department of Chemistry, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Imai Shoji
    Department of Chemistry, Faculty of Integrated Arts and Sciences, The University of Tokushima

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Other Title
  • 黒鉛炉原子吸光法におけるパイロ黒鉛炉表面上に分散した金の原子化機構
  • コクエンロ ゲンシ キュウコウホウ ニ オケル パイロ コクエンロ ヒョウメンジョウ ニ ブンサンシタ キン ノ ゲンシカ キコウ

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Abstract

The atomization of various masses of gold deposited on a pyrolytic graphite furnace was observed between 0.02 and 0.20 ng. The process controlling function obtained indicated the formation of gold aggregates, such as droplets or clusters, and the desorption of gold atoms with the three-dimensional diffusion control. The value of activation energy (Ea) was decreased with decreasing in the mass of gold, indicating a decrease in the particle size. The size was calculated to be 0.34∼1.90 nm in the range 190∼300 kJ mol−1, respectively. It was found that the first order reaction process was obtained and Ea = 88±13 kJ mol−1 in the temperature range of 1162∼1436 K with the mass of 0.02 ng. The Ea value for the monoatomic state of gold dispersed on the conventional PG surface in electrothermal atomizer is discussed from the view point of a change in the degree of surface morphologies with basal plane, newly PG, aged PG, mechanically roughened PG, amorphous carbon and active carbon surfaces.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 57 (8), 677-682, 2008

    The Japan Society for Analytical Chemistry

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