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@ARTICLE{Gkatzelis:838710,
      author       = {Gkatzelis, Georgios and Tillmann, Ralf and Hohaus, Thorsten
                      and Müller, Markus and Eichler, Philipp and Xu, Kang-Ming
                      and Schlag, Patrick and Schmitt, Sebastian H. and Wegener,
                      Robert and Kaminski, Martin and Holzinger, Rupert and
                      Wisthaler, Armin and Kiendler-Scharr, Astrid},
      title        = {{C}omparison of three aerosol chemical characterization
                      techniques utilizing {PTR}-{T}o{F}-{MS}: {A} study on
                      freshly formed and aged biogenic {SOA}},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {288},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2017-07270},
      pages        = {1 - 31},
      year         = {2017},
      abstract     = {An inter-comparison of different aerosol chemical
                      characterization techniques has been performed as part of a
                      chamber study of biogenic SOA formation and aging at the
                      atmosphere simulation chamber SAPHIR. Three different
                      aerosol sampling techniques, the aerosol collection module
                      (ACM), the chemical analysis of aerosol on-line (CHARON) and
                      the collection thermal desorption unit (TD) were connected
                      to Proton Transfer Reaction Time of Flight Mass
                      Spectrometers (PTR-ToF-MS) to provide chemical
                      characterization of the SOA. The techniques were compared
                      among each other and to results from an Aerosol Mass
                      Spectrometer (AMS) and a Scanning Mobility Particle Sizer
                      (SMPS). The experiments investigated SOA formation from the
                      ozonolysis of β-pinene, limonene, a β-pinene/limonene mix
                      and real plant emissions from Pinus sylvestris L. (Scots
                      pine). The SOA was subsequently aged by photooxidation
                      except for limonene SOA which was aged by NO3
                      oxidation.Despite significant differences in the aerosol
                      collection and desorption methods of the PTR based
                      techniques, the determined chemical composition, i.e. the
                      same major contributing signals were found by all
                      instruments for the different chemical systems studied.
                      These signals could be attributed to known products expected
                      from the oxidation of the examined monoterpenes. The
                      sampling and desorption method of ACM and TD, provided
                      additional information on the volatility of individual
                      compounds and showed relatively good agreement.Averaged over
                      all experiments, the total aerosol mass recovery compared to
                      an SMPS varied from $80 ± 10 \%,$ $51 ± 5 \%$
                      and $27 ± 3 \%$ for CHARON, ACM and TD, respectively.
                      Comparison to the oxygen to carbon ratios (O : C)
                      obtained by AMS showed that all PTR based techniques
                      observed lower O : C ratios indicating a loss of
                      molecular oxygen either during aerosol sampling or
                      detection. The differences in total mass recovery and
                      O : C between the three instruments resulted
                      predominately from differences in the field strength (E/N)
                      in the drift-tube reaction ionization chambers of the
                      PTR-ToF-MS instruments and from dissimilarities in the
                      collection/desorption of aerosols. Laboratory case studies
                      showed that PTR-ToF-MS E/N conditions influenced
                      fragmentation which resulted in water loss and carbon-oxygen
                      bond breakage of the detected molecules. Since ACM and TD
                      were operated in higher E/N compared to CHARON this resulted
                      to higher fragmentation, thus affecting primarily the
                      detected oxygen and carbon content and therefore also the
                      mass recovery. Overall, these techniques have been shown to
                      provide valuable insight on the chemical characteristics of
                      BSOA, and can address unknown thermodynamic properties such
                      as partitioning coefficient values and volatility patterns
                      down to a compound specific level.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/amt-2017-288},
      url          = {https://juser.fz-juelich.de/record/838710},
}