Photoformation of OH radical in water-extract of atmospheric aerosols and aqueous solution of water-soluble gases collected in Higashi-Hiroshima, Japan

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Chemical composition, hydroxyl radical (•OH) photoformation rate (R<sub>OH</sub>) and primary generation sources of •OH in water-extract of aerosol (WEA) and aqueous solution of water-soluble gases (WSG) in the atmosphere were studied at Higashi-Hiroshima, Japan from June 2008 to June 2010. Among the major anions present in the WSG samples, the SO<sub>4</sub><sup>2-</sup> concentration was highest (9.4 ± 4.0 nmol m<sup>-3</sup>), followed by NO<sub>3</sub><sup>-</sup> and Cl<sup>-</sup>, while the mean concentration of SO<sub>4</sub><sup>2-</sup> in the WEA fraction was 81 ± 33 nmol m<sup>-3</sup>. The initial concentrations of H<sub>2</sub>O<sub>2</sub> were 0.2 ± 0.3 and 0.9 ± 2.3 nmol m<sup>-3</sup> in the WSG and WEA, respectively. The extracted sample was irradiated using a solar simulator, after which the R<sub>OH</sub> was determined and normalized against the sun-light intensity of a clear sky midday on May 1 at 34°N, which revealed values of 1.4 and 0.5 nmol h<sup>-1</sup> m<sup>-3</sup> for the WEA and WSG, respectively. The contribution of NO<sub>3</sub><sup>-</sup>, NO<sub>2</sub><sup>-</sup> and H<sub>2</sub>O<sub>2</sub> to the formation of •OH via photolysis was 4.5, 0.7 and 1.2%, respectively, for the WSG fraction, while in the WEA fraction, the contribution was 8.9, 1.2 and 2.5%, respectively. Other contribution sources of •OH could include the photo-Fenton reaction and fluorescent matter such as humic-like substances (HULIS). The photo-Fenton reaction was estimated to potentially contribute up to 42% of the total •OH formation in the WSG fraction, while the fluorescent matter may account for the remaining 52%.

収録刊行物

  • Geochemical journal : journal of the Geochemical Society of Japan

    Geochemical journal : journal of the Geochemical Society of Japan 46(1), 21-29, 2012-02-01

    一般社団法人日本地球化学会

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各種コード

  • NII論文ID(NAID)
    10030363660
  • NII書誌ID(NCID)
    AA00654975
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00167002
  • NDL 記事登録ID
    023442296
  • NDL 請求記号
    Z53-R488
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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