Atomization Mechanism of Boron in Graphite Furnace Atomic Absorption Spectrometry Using an Iron Matrix Modifier

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  • 鉄マトリクス修飾剤を用いる黒鉛炉原子吸光分析におけるホウ素の原子化機構
  • テツ マトリクス シュウショクザイ オ モチイル コクエンロ ゲンシキュウコウブンセキ ニ オケル ホウソ ノ ゲンシカ キコウ

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Abstract

An investigation of the atomization mechanism of boron using a commercially averable graphite furnace atomization absorbance spectrometer (GFAAS) was difficult due to the upper limit of atomization temperature. By customizing the GFAAS equipment, the atomic absorbance of boron was observed in a graphite furnace under a constant heating rate, and could be applied to a kinetic approach using the Sturgeon method. In the case of a Fe matrix modifier, which can improve the limit of detection of boron using GFAAS, the pyrolysis curve showed a curve with two plateaus, suggesting the presence of stable products during the pyrolysis step. At the first step (< 1260 K), the activation energy (Ea) of the boron species was 799±72 kJ mol−1, whereas at the second step (1400–1740 K) Ea was 485±78 kJ mol−1. The former Ea value was similar with that of Ca modifier, the latter Ea value was identical to that of Cu mofidier. The boron atomization processes was estimated using model reactions and their reaction enthalpy. At the first step, the decomposition of boron oxides was the rate-determining step, whereas at the second step the oxidative decomposition of boron carbides was the rate-determining step.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 66 (9), 629-637, 2017

    The Japan Society for Analytical Chemistry

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