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首页> 外文期刊>Environmental Science & Technology >Detection of S(IV) Species in Aerosol Particles Using XANES Spectroscopy
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Detection of S(IV) Species in Aerosol Particles Using XANES Spectroscopy

机译：XANES光谱法检测气溶胶颗粒中的S（IV）种类

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摘要

X-ray absorption near-edge structure spectroscopy (XANES) has been applied to the determination and quantification of S(IV) species in aerosol samples collected at Qingdao in northeastern China. The XANES spectra showed that sulfite was found only in particles with larger diameters {mineral aerosols) collected in August 2001. Two oxidation treatments suggested that calcium sulfite (hannebachite) was the main S(IV) species in aerosols. No S{IV) species, however, were found at the surface of the aerosols as shown by surface-sensitive conversion electron/He ion yield XANES. The presence of hannebachite in the interior of aerosols demonstrates the importance of heterogeneous oxidation of SO_2 (adsorption of SO_2 at the surface of mineral aerosols such as calcite with subsequent oxidation). The fact that this process is supported from XANES analysis for natural samples is important because sulfite formed by the adsorption of SO_2 has only been detected in laboratory studies so far. The contribution of heterogeneous oxidation to the total rate of SO_2 oxidation is not clear at present. However, this study suggests that the adsorption of SO_2 on mineral aerosols without oxidation can reduce the oxidation of SO_2 in the atmosphere, especially in the presence of calcite.
机译：X射线吸收近边缘结构光谱法（XANES）已用于测定和定量在中国东北青岛收集的气溶胶样品中的S（IV）物种。 XANES光谱表明，亚硫酸盐仅在2001年8月收集的较大直径的颗粒（矿物气溶胶）中发现。两种氧化处理表明，亚硫酸钙（半水镁石）是气溶胶中的主要S（IV）种类。然而，如表面敏感的转化电子/ He离子产率XANES所示，在气溶胶表面未发现S（IV）物质。在气溶胶内部存在的水钠钙石证明了SO_2异质氧化的重要性（SO_2在矿物气溶胶（如方解石）表面的吸附以及随后的氧化）。 XANES分析对天然样品的支持这一过程非常重要，因为到目前为止，仅在实验室研究中才发现了由SO_2吸附形成的亚硫酸盐。目前尚不清楚多相氧化对SO_2氧化总速率的贡献。但是，这项研究表明，SO_2在矿物气溶胶上的吸附而不发生氧化可以减少大气中SO_2的氧化，特别是在方解石的存在下。

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  • 来源
    《Environmental Science & Technology》 |2009年第19期|7357-7363|共7页
  • 作者

    MASAYUKI HIGASHI; YOSHIO TAKAHASHI;

  • 作者单位

    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima,Hiroshima 739-8526, Japan;

    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima,Hiroshima 739-8526, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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