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@ARTICLE{VolzThomas:34307,
      author       = {Volz-Thomas, A. and Slemr, J. and Konrad, S. and Schmitz,
                      T. and Apel, E. C. and Mohnen, V. A.},
      title        = {{Q}uality assurance of hydrocarbon measurements in the
                      {G}erman {T}ropospheric {R}esearch {F}ocus ({TFS})},
      journal      = {Journal of atmospheric chemistry},
      volume       = {42},
      issn         = {0167-7764},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-34307},
      pages        = {255 - 279},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {In the German Focus on Tropospheric Research (TFS)
                      independent quality assurance procedures were implemented in
                      order to obtain information on data quality and
                      comparability of the different measurements made in the
                      different field campaigns. This paper describes the results
                      for measurements of hydrocarbons using in-situ gas
                      chromatographic techniques and off line analysis of samples
                      collected in canisters (analysed by two central laboratories
                      CL-1 and CL-2) and samples collected on adsorption tubes.
                      The QA-procedures included comparisons with synthetic
                      standards (prepared by EN 45001 certified laboratories),
                      absolute calibration with a diffusion source, and an
                      instrument/methodology comparison in ambient air.
                      Harmonisation of the ambient measurements was achieved with
                      a complex mixture (NCAR/BERLIOZ) containing 70 commonly
                      observed hydrocarbons at mixing ratios of 0.2 to 10 ppb
                      (mole fraction) in nitrogen, which was calibrated by
                      referencing to hydrocarbon standards of the National
                      Institute for Standards and Technology (NIST).For the
                      certified synthetic standards, the experienced groups agreed
                      to within $+/-20\%$ for most compounds. Much larger
                      discrepancies were observed for the new Airmotec HC2010
                      instruments due to problems with identification, co-elution
                      and blanks/memory effects. The results in ambient air were
                      similar: Reasonable agreement was found for the results from
                      the experienced groups with well characterised in situ
                      instruments and for the charcoal tubes, whereas larger
                      discrepancies were observed for the results from new groups
                      and instruments. For the latter, only selected compounds met
                      the data quality objectives (DQO). The canister samples
                      analysed by CL-2 were in good agreement with the reference
                      instrument, whereas large deviations were found for a number
                      of compounds in the analysis of the same canisters by CL-1.
                      The results of the comparison provided the final basis for
                      flagging and harmonising the data from all participants
                      prior to their submission to the TFS central data bank.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Environmental Sciences / Meteorology $\&$ Atmospheric
                      Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000175947400012},
      doi          = {10.1023/A:1015793319095},
      url          = {https://juser.fz-juelich.de/record/34307},
}