Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.668 IF 3.668
  • IF 5-year value: 3.707 IF 5-year
    3.707
  • CiteScore value: 6.3 CiteScore
    6.3
  • SNIP value: 1.383 SNIP 1.383
  • IPP value: 3.75 IPP 3.75
  • SJR value: 1.525 SJR 1.525
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 77 Scimago H
    index 77
  • h5-index value: 49 h5-index 49
Preprints
https://doi.org/10.5194/amt-2020-271
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-271
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  17 Jul 2020

17 Jul 2020

Review status
This preprint is currently under review for the journal AMT.

An in situ gas chromatograph with automatic detector switching between Vocus PTR-TOF-MS and EI-TOF-MS: Isomer resolved measurements of indoor air

Megan S. Claflin1, Demetrios Pagonis2,3, Zachary Finewax2,3,a, Anne V. Handschy2,3, Douglas A. Day2,3, Wyatt L. Brown2,3, John T. Jayne1, Douglas R. Worsnop1, Jose L. Jimenez2,3, Paul J. Ziemann2,3, Joost de Gouw2,3, and Brian M. Lerner1 Megan S. Claflin et al.
  • 1Aerodyne Research Inc., Billerica, Massachusetts 01821, USA
  • 2Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, Colorado 80309, USA
  • 3Department of Chemistry, University of Colorado, Boulder, Colorado 80309, USA
  • anow at: Chemical Sciences Laboratory, Earth System Research Laboratory, National Oceanic and Atmospheric Administration,Boulder, Colorado, 80305, USA

Abstract. We have developed a field-deployable gas chromatograph (GC) with thermal desorption preconcentration (TDPC), which is demonstrated here with automatic detector switching between two high-resolution time-of-flight mass spectrometers (TOF-MS) for in situ measurements of volatile organic compounds (VOCs). This system provides many analytical advances including acquisition of fast time-response data in tandem with molecular speciation and two types of mass spectral information for each resolved GC peak: molecular ion identification from Vocus proton transfer reaction (PTR) TOF-MS and fragmentation pattern from electron ionization (EI) TOF-MS detection. This system was deployed during the 2018 ATHLETIC campaign at the University of Colorado Dal Ward Athletic Center in Boulder, Colorado where it was used to characterize VOC emissions in the indoor environment. The addition of the TDPC-GC increased the Vocus sensitivity by a factor of 50 due to preconcentration over a 6 min GC sample time versus direct air sampling with the Vocus which was operated with a time resolution of 1 Hz. The GC-TOF methods demonstrated average limits of detection of 1.6 ppt across a range of monoterpenes and aromatics. Here, we describe the method to use the two-detector system to conclusively identify a range of VOCs including hydrocarbons, oxygenates and halocarbons, along with detailed results including the quantification of anthropogenic monoterpenes, where limonene accounted for 47–80 % of the indoor monoterpene composition. We also report the detection of dimethylsilanediol (DMSD), an organosiloxane degradation product, which was observed with dynamic temporal behavior distinct from volatile organosiloxanes (e.g. decamethylcyclopentasiloxane, D5 siloxane). Our results suggest DMSD is produced from humidity-dependent, heterogeneous reactions occurring on surfaces in the indoor environment, rather than formed through gas-phase oxidation of volatile siloxanes.

Megan S. Claflin et al.

Interactive discussion

Status: open (until 11 Sep 2020)
Status: open (until 11 Sep 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Megan S. Claflin et al.

Megan S. Claflin et al.

Viewed

Total article views: 267 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
181 78 8 267 18 6 7
  • HTML: 181
  • PDF: 78
  • XML: 8
  • Total: 267
  • Supplement: 18
  • BibTeX: 6
  • EndNote: 7
Views and downloads (calculated since 17 Jul 2020)
Cumulative views and downloads (calculated since 17 Jul 2020)

Viewed (geographical distribution)

Total article views: 271 (including HTML, PDF, and XML) Thereof 271 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 08 Aug 2020
Publications Copernicus
Download
Short summary
We have developed a field-deployable gas chromatograph with thermal desorption preconcentration and detector switching between two high-resolution mass spectrometers for in situ measurements of volatile organic compounds (VOCs). This system combines chromatography with both proton-transfer and electron ionization to offer fast-time response and continuous molecular speciation. This technique was applied during the 2018 ATHLETIC campaign to characterize VOC emissions in an indoor environment.
We have developed a field-deployable gas chromatograph with thermal desorption preconcentration...
Citation