MISC

2008年

Technical Note: Determination of formaldehyde mixing ratios in air with PTR-MS: laboratory experiments and field measurements

ATMOSPHERIC CHEMISTRY AND PHYSICS
  • S. Inomata
  • ,
  • H. Tanimoto
  • ,
  • S. Kameyama
  • ,
  • U. Tsunogai
  • ,
  • H. Irie
  • ,
  • Y. Kanaya
  • ,
  • Z. Wang

8
2
開始ページ
273
終了ページ
284
記述言語
英語
掲載種別
DOI
10.5194/acp-8-273-2008
出版者・発行元
COPERNICUS GESELLSCHAFT MBH

Formaldehyde (HCHO), the most abundant carbonyl compound in the atmosphere, is generated as an intermediate product in the oxidation of nonmethane hydrocarbons. Proton transfer reaction mass spectrometry (PTR-MS) has the capability to detect HCHO from ion signals at m/z 31 with high time-resolution. However, the detection sensitivity is low compared to other detectable species, and is considerably affected by humidity, due to back reactions between protonated HCHO and water vapor prior to analysis. We performed a laboratory calibration of PTR-MS for HCHO and examined the detection sensitivity and humidity dependence at various field strengths. Subsequently, we deployed the PTR-MS instrument in a field campaign at Mount Tai in China in June 2006 to measure HCHO in various meteorological and photochemical conditions; we also conducted intercomparison measurements by Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS). Correction of interference in the m/z 31 signals by fragments from proton transfer reactions with methyl hydroperoxide, methanol, and ethanol greatly improves agreement between the two methods, giving the correlation [HCHO](MAX-DOAS)=(0.99 +/- 0.16) [HCHO](PTR-MS)+(0.02 +/- 0.38), where error limits represent 95% confidence levels.

リンク情報
DOI
https://doi.org/10.5194/acp-8-273-2008
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000253908100007&DestApp=WOS_CPL
ID情報
  • DOI : 10.5194/acp-8-273-2008
  • ISSN : 1680-7316
  • eISSN : 1680-7324
  • Web of Science ID : WOS:000253908100007

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