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

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タイトル別名
  • Atomization Mechanisms of Gold Dispersed on Pyrolytic Graphite Surface in Graphite Furnace Atomic Absorption Spectrometry
  • 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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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.

収録刊行物

  • 分析化学

    分析化学 57 (8), 677-682, 2008

    公益社団法人 日本分析化学会

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