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@MASTERSTHESIS{Miebach:27087,
      author       = {Miebach, M.},
      title        = {{A}ufnahme flüchtiger organischer {V}erbindungen durch
                      {P}flanzen},
      volume       = {4062},
      issn         = {0944-2952},
      school       = {Fachhochsch. Aachen},
      type         = {Diplom (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-27087, Juel-4062},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {VII, 56 p.},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012; Aachen,
                      Fachhochsch., Abt. Jülich, Dipl. 2003},
      abstract     = {Because volatile organic compounds (VOC) influence the
                      radical balance and the photochemical ozone production in
                      troposphere they play an important role for atmospheric
                      chemistry. Thus, for atmospheric chemistry it is important
                      to know the strength of VOC sources and VOC sinks. VOC
                      emission from plants is well known. However, it is unclear
                      whether or not plants can act as sinks for VOC. This was
                      investigated in the present study. Sunflower (Helianthus
                      annuus L.) was exposed to different VOC in laboratory
                      experiments under well defined conditions. For individual
                      VOC the concentrations were quantified using gas
                      chromatography-mass spectrometry. A possible uptake by the
                      plants was determined from the concentration differences
                      between chamber inlet and outlet. In cases where a
                      significant uptake by the plants was observed the flux
                      densities were determined using the leaf area as a
                      normalization factor. By variations of light intensity
                      stomatal aperture was changed allowing to determine the
                      passway of the individual VOC into the plant. For the
                      compounds acetaldehyde, acetone, ethanol, isoprene, limonene
                      und methanol no uptake by sunflower was observed. These
                      substances were only emitted even if the plants were exposed
                      to VOC concentrations above 50 ppb . For (E)-3-hexenol,
                      hexanal, octanal and nopinone significant concentration
                      differences between chamber inlet and outlet were found. It
                      was ruled out that these loses were due to reactions in the
                      gas phase or interferences at the walls of the analytic
                      equipment. The data showed no significant deposition onto
                      the plants cuticula but good relations between stomatal
                      aperture and loss of the VOC. These relations showed a
                      limitation of the uptake by diffusion through the Stomata
                      for (E)-3-hexenol, hexanal, and octanal. For nopinone an
                      internal resistance for the uptake was found. Furthermore,
                      calculations showed Chat a solution of the compounds in the
                      apoplasic water could not explain the uptake rates implying
                      a metabolization of (E)-3-hexenol, hexanal, and octanal.
                      Using the measured data it was shown Chat sunflowers are
                      able to uptake up to 4 g hexanal per m$^{2}$ and day (12h)
                      at an atmospheric mixing ration of 30 ppb. Dependent on the
                      meteorological conditions and dependent on the individual
                      VOC the loss by dry deposition onto plants can contribute to
                      more Chan 20 \% of the total loss from the atmosphere. In
                      such cases dry deposition of VOC on plant surfaces cannot be
                      neglected as a sink.},
      cin          = {ICG-III},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      typ          = {PUB:(DE-HGF)10},
      url          = {https://juser.fz-juelich.de/record/27087},
}