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@ARTICLE{Iannone:60710,
      author       = {Iannone, R. and Koppmann, R. and Rudolph, J.},
      title        = {{A} technique for atmospheric measurements of stable carbon
                      isotope ratios of isoprene, methacrolein, and methyl vinyl
                      ketone},
      journal      = {Journal of atmospheric chemistry},
      volume       = {58},
      issn         = {0167-7764},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-60710},
      pages        = {181 - 202},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A technique was developed to measure stable carbon isotope
                      ratios (C-13/C-12) of light volatile organic compounds
                      (VOCs) such as isoprene, methacrolein (MACR) and methyl
                      vinyl ketone (MVK) using gas chromatography combustion
                      isotope ratio mass spectrometry (GCC-IRMS). An automated
                      sampling and cryofocussing system allowed for the extraction
                      of VOCs from air samples of up to 140 L of air collected
                      over 3 h, and the subsequent C-13/C-12 analysis of the VOCs
                      by GCC-IRMS. Chromatography using selective transfer between
                      two columns was used to improve the separation for selected
                      compounds, increasing peak resolution and attaining less
                      noisy baselines. Still, some target compounds could not be
                      completely separated from co-eluting peaks. To reduce the
                      bias of isotope ratio determinations, which can result from
                      incomplete peak resolution, a peak-fitting procedure has
                      been developed. In cases of overlapping peaks or substantial
                      baseline drift, this peak fitting allows more accurate
                      determination of isotope ratios than conventional
                      integration schemes. Comparisons between off-line IRMS
                      measurements and a peak-evaluation procedure using a
                      prepared VOC gas-phase standard show that isotope ratios
                      derived from large (> 1 ng of carbon per peak) and
                      well-resolved peaks have a reproducibility of +/- 0.3 parts
                      per thousand. With smaller masses in the range of 0.1-1 ng
                      of carbon, reproducibility decreased to +/-(0.5-0.8)parts
                      per thousand. For a 140 L sample of air, such small masses
                      of carbon correspond to mixing ratios in the low pptV range.
                      The developed measurement technique was applied to a small
                      set of ambient air samples taken during hot, sunny periods
                      from late May to early August, 2005, at Forschungszentrum
                      Julich, Germany, a semi-rural area. The range of delta C-13
                      values determined for isoprene, benzene, and toluene are
                      consistent with those reported in the literature. GCC-IRMS
                      results of delta C-13 for ambient samples of isoprene, MACR,
                      and MVK, measured at mixing ratios of 15-280 pptV, are
                      presented and discussed.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Environmental Sciences / Meteorology $\&$ Atmospheric
                      Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000251874800001},
      doi          = {10.1007/s10874-007-9087-5},
      url          = {https://juser.fz-juelich.de/record/60710},
}