レーザー誘起蛍光法によるＮＯ３／Ｎ２Ｏ５測定装置の開発と冬季の夜間大気中の窒素酸化物による大気酸性化の評価

DOI

書誌事項

タイトル別名
  • Development of an NO3/N2O5 Analyzer utilizing a Laser-Induced-Fluorescence Technique and Evaluation of Winter Nocturnal Oxidation by Nitrogen Oxides.

抄録

Since NO3 is present at significant levels during the night, NO3 reacts with various VOCs, such as monoterpens, generating peroxy radicals and nitric acid. In addition, N2O5, formed through a reaction between NO3 and NO2, reacts heterogeneously with water vapor on aerosol surfaces yielding nitric acid. These are the main loss processes of NOx at night. Thus, measurement of NO3 and N2O5 is essential for an understanding of nocturnal chemistry. We have developed a new instrument to measure NO3 which is fast, sensitive, and simple in technique, laser-induced-fluorescence (LIF). This instrument can detect not only NO3 but also N2O5 by heating air samples just before the sample inlet. The limits of detection (LOD) for NO3 and N2O5 are determined to be 5 and 7 pptv, respectively for 10 minute intervals.<BR>Ambient N2O5 at Tokyo Metropolitan University in December 2003 was successfully measured with this instrument for the first time. N2O5 was observed at significant concentration even when NO was large. Assuming that the heterogenenous reaction of N2O5 is predominant in the NOx removal reaction in winter, the amount of NOx removal through N2O5 is estimated as 5.4 ppbv/night. It is comparable to the daytime NOx removal by the OH radical. Thus, the N2O5 reaction is demonstrated to be significant as a source of nitric acid.

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390282679593132672
  • NII論文ID
    130004377436
  • DOI
    10.11298/taiki1995.40.3_95
  • COI
    1:CAS:528:DC%2BD2MXmtVCjsr0%3D
  • ISSN
    21854335
    13414178
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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