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: 3.248 IF 3.248
  • IF 5-year value: 3.650 IF 5-year 3.650
  • CiteScore value: 3.37 CiteScore 3.37
  • SNIP value: 1.253 SNIP 1.253
  • SJR value: 1.869 SJR 1.869
  • IPP value: 3.29 IPP 3.29
  • h5-index value: 47 h5-index 47
  • Scimago H index value: 60 Scimago H index 60
Discussion papers | Copyright
https://doi.org/10.5194/amt-2017-442
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 May 2018

Research article | 02 May 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

Field measurements of methylglyoxal using Proton Transfer Reaction-Time of Flight Mass Spectrometry and comparison to the DNPH/HPLC-UV method

Vincent Michoud1,2, Stéphane Sauvage1, Thierry Léonardis1, Isabelle Fronval1, Alexandre Kukui3, Nadine Locoge1, and Sébastien Dusanter1 Vincent Michoud et al.
  • 1IMT Lille Douai, Univ. Lille, SAGE – Département Sciences de l'Atmosphère et Génie de l'Environnement, 59000 Lille, France
  • 2LISA/IPSL, Laboratoire Interuniversitaire des Systèmes Atmosphériques, UMR CNRS 7583, Université Paris Est Créteil (UPEC) et Université Paris Diderot (UPD), Créteil, France
  • 3Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), UMR6115 CNRS – Université d'Orléans, 45071 Orléans CEDEX 2, France

Abstract. Methylglyoxal (MGLY) is an important atmospheric α-dicarbonyl species whose photolysis acts as a significant source of peroxy radicals, contributing to the oxidizing capacity of the atmosphere and, as such, the formation of secondary pollutants such as organic aerosols and ozone. However, despite its importance, only a few techniques exhibit time resolutions and detection limits that are suitable for atmospheric measurements.

This study present, to the best of our knowledge, the first measurements of ambient MGLY using Proton Transfer Reaction-Time of Flight Mass Spectrometry (PTR-ToFMS). These measurements were performed during the ChArMEx SOP2 field campaign. This campaign took place at a Mediterranean site characterized by intense biogenic emissions and low levels of anthropogenic trace gases. Concomitant measurements of MGLY were performed using the 2,4-dinitrophenylhydrazine (DNPH) derivatization technique and High Performance Liquide Chromatography (HPLC) with UV detection. PTR-ToFMS and DNPH-HPLC measurements were compared to determine whether these techniques can perform reliable measurements of MGLY.

Ambient time series revealed levels of MGLY ranging from 28–365pptv, with a clear diurnal cycle due to elevated concentrations of primary biogenic species during daytime, whose oxidation led to large production rates of MGLY. A scatter plot of the PTR-ToFMS and DNPH-HPLC measurements indicates a reasonable correlation (R2=0.48) but a slope significantly lower than unity (0.58±0.05) and a significant intercept of 88.3±8.0pptv. A careful investigation of the differences between the two techniques suggests that this disagreement is not due to spectrometric interferences from H3O+(H2O)3, MEK (or butanal) detected at m/z 73.050 and m/z 73.065, respectively, which are close to the MGLY m/z of 73.029. The differences are more likely due to uncorrected sampling artefacts such as overestimated collection efficiency or loss of MGLY into the sampling line for the DNPH-HPLC technique or unknown isobaric interfering compounds such as acrylic acid and propanediol for the PTR-ToFMS.

Calculations of MGLY loss rates with respect to OH-oxidation and direct photolysis indicate similar contributions for these two loss pathways.

Vincent Michoud et al.
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Vincent Michoud et al.
Vincent Michoud et al.
Viewed
Total article views: 354 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
271 78 5 354 25 3 13
  • HTML: 271
  • PDF: 78
  • XML: 5
  • Total: 354
  • Supplement: 25
  • BibTeX: 3
  • EndNote: 13
Views and downloads (calculated since 02 May 2018)
Cumulative views and downloads (calculated since 02 May 2018)
Viewed (geographical distribution)
Total article views: 354 (including HTML, PDF, and XML) Thereof 349 with geography defined and 5 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited
Saved
No saved metrics found.
Discussed
No discussed metrics found.
Latest update: 16 Oct 2018
Publications Copernicus
Special issue
Download
Short summary
This study present the first measurements of ambient methylglyoxal, an important atmospheric α-dicarbonyl, using Proton Transfer Reaction-Time of Flight Mass Spectrometry. These measurements fairly agree with concomitant measurements from a reference technic: DNPH derivatization technique and High Performance Liquide Chromatography with UV detection. In addition, a careful investigation of the differences between the two techniques is performed to explain the disagreements observed.
This study present the first measurements of ambient methylglyoxal, an important atmospheric...
Citation
Share