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@ARTICLE{Ammann:44166,
      author       = {Ammann, C. and Spirig, C. and Neftel, A. and Steinbacher,
                      M. and Komenda, M. and Schaub, A.},
      title        = {{A}pplication of {PTR}-{MS} for measurements of biogenic
                      {VOC} in a deciduous forest},
      journal      = {International journal of mass spectrometry},
      volume       = {239},
      issn         = {1387-3806},
      address      = {[S.l.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-44166},
      pages        = {87 - 101},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The Vegetation-atmosphere-exchange is an important process
                      controlling the atmospheric concentration of various
                      volatile organic compounds (VOCs) that play a major role in
                      atmospheric chemistry. However, the quantification of VOC
                      exchange on the ecosystem scale is still an analytical
                      challenge. In the present study we tested and applied a
                      proton-transfer-reaction mass spectrometry system (PTR-MS)
                      for the measurement of biogenic VOCs in a mixed deciduous
                      forest, VOC concentrations were from the raw instrument
                      signals based on physical principles. This method allows a
                      consistent quantification also of compounds for which
                      regular calibration with a gas standard is not available. It
                      requires a regular and careful investigation of the
                      mass-dependent ion detection characteristics of the PTR-MS,
                      which otherwise could become a considerable error source.
                      The PTR-MS method was tested in the laboratory for a range
                      of oxygenated and non-oxygenated VOCs using a permeation
                      source. the agreement was within $16\%$ or better, which is
                      well within the expected uncertainty.During the field
                      measurement campaign in a deciduous forest stand, an on-line
                      intercomparison with a state-of-the-art gas-chromatography
                      system showed a generally good agreement. However, the
                      relatively low ambient VOC concentrations revealed some
                      systematic difference for acetone and isoprene, that may
                      indicate an error in the determination of the PTR-MS offset
                      or an interference of an unidentified isobaric compound on
                      the detected ion mass. With the presentation of selected
                      field results, we demonstrate the ability of the PTR-MS
                      system to measure continuous vertical concentration profiles
                      of biogenic VOCs throughout a forest canopy at a time
                      resolution of 20 min. The resulting datasets provide
                      valuable information for the study of the interactions
                      between emission, photochemical transformation and transport
                      processes within and above the forest canopy. (C) 2004
                      Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical / Spectroscopy},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000225902200003},
      doi          = {10.1016/j.ijms.2004.08.012},
      url          = {https://juser.fz-juelich.de/record/44166},
}